claimtrie: allows '*' in claim name

1. Fixed a bug, which reads certs even TLS is disabled

2. Persists Stratum TCP connection with auto-reconnect.
   (retry backoff increases from 1s to 60s maximum)

3. Stratum update jobs on previous notifications are canceled
   when a new notification arrives.

   Usually, the jobs are so short and completed immediately.
   However, if the Stratum connection is broken, this prevents
   the bridge from accumulating stale jobs.

btcjson/chainsvrcmds.go

@@ -67,7 +67,7 @@ type TransactionInput struct {
 // CreateRawTransactionCmd defines the createrawtransaction JSON-RPC command.
 type CreateRawTransactionCmd struct {
 	Inputs   []TransactionInput
-	Amounts  map[string]float64 `jsonrpcusage:"{\"address\":amount,...}"` // In BTC
+	Outputs  map[string]interface{} `jsonrpcusage:"{\"address\":amount, \"data\":\"hex\", ...}"`
 	LockTime *int64
 }
 
@@ -76,7 +76,7 @@ type CreateRawTransactionCmd struct {
 //
 // Amounts are in BTC. Passing in nil and the empty slice as inputs is equivalent,
 // both gets interpreted as the empty slice.
-func NewCreateRawTransactionCmd(inputs []TransactionInput, amounts map[string]float64,
+func NewCreateRawTransactionCmd(inputs []TransactionInput, outputs map[string]interface{},
 	lockTime *int64) *CreateRawTransactionCmd {
 	// to make sure we're serializing this to the empty list and not null, we
 	// explicitly initialize the list
@@ -85,7 +85,7 @@ func NewCreateRawTransactionCmd(inputs []TransactionInput, amounts map[string]fl
 	}
 	return &CreateRawTransactionCmd{
 		Inputs:   inputs,
-		Amounts:  amounts,
+		Outputs:  outputs,
 		LockTime: lockTime,
 	}
 }

btcjson/chainsvrcmds_test.go

@@ -52,13 +52,13 @@ func TestChainSvrCmds(t *testing.T) {
 				txInputs := []btcjson.TransactionInput{
 					{Txid: "123", Vout: 1},
 				}
-				amounts := map[string]float64{"456": .0123}
-				return btcjson.NewCreateRawTransactionCmd(txInputs, amounts, nil)
+				txOutputs := map[string]interface{}{"456": .0123}
+				return btcjson.NewCreateRawTransactionCmd(txInputs, txOutputs, nil)
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"createrawtransaction","params":[[{"txid":"123","vout":1}],{"456":0.0123}],"id":1}`,
 			unmarshalled: &btcjson.CreateRawTransactionCmd{
 				Inputs:  []btcjson.TransactionInput{{Txid: "123", Vout: 1}},
-				Amounts: map[string]float64{"456": .0123},
+				Outputs: map[string]interface{}{"456": .0123},
 			},
 		},
 		{
@@ -67,13 +67,13 @@ func TestChainSvrCmds(t *testing.T) {
 				return btcjson.NewCmd("createrawtransaction", `[]`, `{"456":0.0123}`)
 			},
 			staticCmd: func() interface{} {
-				amounts := map[string]float64{"456": .0123}
-				return btcjson.NewCreateRawTransactionCmd(nil, amounts, nil)
+				txOutputs := map[string]interface{}{"456": .0123}
+				return btcjson.NewCreateRawTransactionCmd(nil, txOutputs, nil)
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"createrawtransaction","params":[[],{"456":0.0123}],"id":1}`,
 			unmarshalled: &btcjson.CreateRawTransactionCmd{
 				Inputs:  []btcjson.TransactionInput{},
-				Amounts: map[string]float64{"456": .0123},
+				Outputs: map[string]interface{}{"456": .0123},
 			},
 		},
 		{
@@ -86,16 +86,35 @@ func TestChainSvrCmds(t *testing.T) {
 				txInputs := []btcjson.TransactionInput{
 					{Txid: "123", Vout: 1},
 				}
-				amounts := map[string]float64{"456": .0123}
-				return btcjson.NewCreateRawTransactionCmd(txInputs, amounts, btcjson.Int64(12312333333))
+				txOutputs := map[string]interface{}{"456": .0123}
+				return btcjson.NewCreateRawTransactionCmd(txInputs, txOutputs, btcjson.Int64(12312333333))
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"createrawtransaction","params":[[{"txid":"123","vout":1}],{"456":0.0123},12312333333],"id":1}`,
 			unmarshalled: &btcjson.CreateRawTransactionCmd{
 				Inputs:   []btcjson.TransactionInput{{Txid: "123", Vout: 1}},
-				Amounts:  map[string]float64{"456": .0123},
+				Outputs:  map[string]interface{}{"456": .0123},
 				LockTime: btcjson.Int64(12312333333),
 			},
 		},
+		{
+			name: "createrawtransaction with data",
+			newCmd: func() (interface{}, error) {
+				return btcjson.NewCmd("createrawtransaction", `[{"txid":"123","vout":1}]`,
+					`{"data":"6a134920616d204672616374616c456e6372797074"}`)
+			},
+			staticCmd: func() interface{} {
+				txInputs := []btcjson.TransactionInput{
+					{Txid: "123", Vout: 1},
+				}
+				txOutputs := map[string]interface{}{"data": "6a134920616d204672616374616c456e6372797074"}
+				return btcjson.NewCreateRawTransactionCmd(txInputs, txOutputs, nil)
+			},
+			marshalled: `{"jsonrpc":"1.0","method":"createrawtransaction","params":[[{"txid":"123","vout":1}],{"data":"6a134920616d204672616374616c456e6372797074"}],"id":1}`,
+			unmarshalled: &btcjson.CreateRawTransactionCmd{
+				Inputs:  []btcjson.TransactionInput{{Txid: "123", Vout: 1}},
+				Outputs: map[string]interface{}{"data": "6a134920616d204672616374616c456e6372797074"},
+			},
+		},
 		{
 			name: "fundrawtransaction - empty opts",
 			newCmd: func() (i interface{}, e error) {

btcjson/chainsvrresults.go

@@ -35,35 +35,37 @@ type GetBlockHeaderVerboseResult struct {
 }
 
 // GetBlockStatsResult models the data from the getblockstats command.
+// Pointers are used instead of values to allow for optional fields.
 type GetBlockStatsResult struct {
-	AverageFee         int64   `json:"avgfee"`
-	AverageFeeRate     int64   `json:"avgfeerate"`
-	AverageTxSize      int64   `json:"avgtxsize"`
-	FeeratePercentiles []int64 `json:"feerate_percentiles"`
-	Hash               string  `json:"blockhash"`
-	Height             int64   `json:"height"`
-	Ins                int64   `json:"ins"`
-	MaxFee             int64   `json:"maxfee"`
-	MaxFeeRate         int64   `json:"maxfeerate"`
-	MaxTxSize          int64   `json:"maxtxsize"`
-	MedianFee          int64   `json:"medianfee"`
-	MedianTime         int64   `json:"mediantime"`
-	MedianTxSize       int64   `json:"mediantxsize"`
-	MinFee             int64   `json:"minfee"`
-	MinFeeRate         int64   `json:"minfeerate"`
-	MinTxSize          int64   `json:"mintxsize"`
-	Outs               int64   `json:"outs"`
-	SegWitTotalSize    int64   `json:"swtotal_size"`
-	SegWitTotalWeight  int64   `json:"swtotal_weight"`
-	SegWitTxs          int64   `json:"swtxs"`
-	Subsidy            int64   `json:"subsidy"`
-	Time               int64   `json:"time"`
-	TotalOut           int64   `json:"total_out"`
-	TotalSize          int64   `json:"total_size"`
-	TotalWeight        int64   `json:"total_weight"`
-	Txs                int64   `json:"txs"`
-	UTXOIncrease       int64   `json:"utxo_increase"`
-	UTXOSizeIncrease   int64   `json:"utxo_size_inc"`
+	AverageFee         *int64   `json:"avgfee,omitempty"`
+	AverageFeeRate     *int64   `json:"avgfeerate,omitempty"`
+	AverageTxSize      *int64   `json:"avgtxsize,omitempty"`
+	FeeratePercentiles *[]int64 `json:"feerate_percentiles,omitempty"`
+	Hash               *string  `json:"blockhash,omitempty"`
+	Height             *int64   `json:"height,omitempty"`
+	Ins                *int64   `json:"ins,omitempty"`
+	MaxFee             *int64   `json:"maxfee,omitempty"`
+	MaxFeeRate         *int64   `json:"maxfeerate,omitempty"`
+	MaxTxSize          *int64   `json:"maxtxsize,omitempty"`
+	MedianFee          *int64   `json:"medianfee,omitempty"`
+	MedianTime         *int64   `json:"mediantime,omitempty"`
+	MedianTxSize       *int64   `json:"mediantxsize,omitempty"`
+	MinFee             *int64   `json:"minfee,omitempty"`
+	MinFeeRate         *int64   `json:"minfeerate,omitempty"`
+	MinTxSize          *int64   `json:"mintxsize,omitempty"`
+	Outs               *int64   `json:"outs,omitempty"`
+	SegWitTotalSize    *int64   `json:"swtotal_size,omitempty"`
+	SegWitTotalWeight  *int64   `json:"swtotal_weight,omitempty"`
+	SegWitTxs          *int64   `json:"swtxs,omitempty"`
+	Subsidy            *int64   `json:"subsidy,omitempty"`
+	Time               *int64   `json:"time,omitempty"`
+	TotalOut           *int64   `json:"total_out,omitempty"`
+	TotalSize          *int64   `json:"total_size,omitempty"`
+	TotalWeight        *int64   `json:"total_weight,omitempty"`
+	TotalFee           *int64   `json:"totalfee,omitempty"`
+	Txs                *int64   `json:"txs,omitempty"`
+	UTXOIncrease       *int64   `json:"utxo_increase,omitempty"`
+	UTXOSizeIncrease   *int64   `json:"utxo_size_inc,omitempty"`
 }
 
 type GetBlockVerboseResultBase struct {

btcjson/walletsvrcmds.go

@@ -176,12 +176,13 @@ func NewGetAccountCmd(address string) *GetAccountCmd {
 
 // GetAccountAddressCmd defines the getaccountaddress JSON-RPC command.
 type GetAccountAddressCmd struct {
-	Account string
+	Account     *string `jsonrpcdefault:"\"default\""`
+	AddressType *string `jsonrpcdefault:"\"legacy\""`
 }
 
 // NewGetAccountAddressCmd returns a new instance which can be used to issue a
 // getaccountaddress JSON-RPC command.
-func NewGetAccountAddressCmd(account string) *GetAccountAddressCmd {
+func NewGetAccountAddressCmd(account *string) *GetAccountAddressCmd {
 	return &GetAccountAddressCmd{
 		Account: account,
 	}
@@ -189,12 +190,13 @@ func NewGetAccountAddressCmd(account string) *GetAccountAddressCmd {
 
 // GetAddressesByAccountCmd defines the getaddressesbyaccount JSON-RPC command.
 type GetAddressesByAccountCmd struct {
-	Account string
+	Account     *string `jsonrpcdefault:"\"default\""`
+	AddressType *string `jsonrpcdefault:"\"*\""`
 }
 
 // NewGetAddressesByAccountCmd returns a new instance which can be used to issue
 // a getaddressesbyaccount JSON-RPC command.
-func NewGetAddressesByAccountCmd(account string) *GetAddressesByAccountCmd {
+func NewGetAddressesByAccountCmd(account *string) *GetAddressesByAccountCmd {
 	return &GetAddressesByAccountCmd{
 		Account: account,
 	}
@@ -215,8 +217,9 @@ func NewGetAddressInfoCmd(address string) *GetAddressInfoCmd {
 
 // GetBalanceCmd defines the getbalance JSON-RPC command.
 type GetBalanceCmd struct {
-	Account *string
-	MinConf *int `jsonrpcdefault:"1"`
+	Account     *string `jsonrpcdefault:"\"default\""`
+	MinConf     *int    `jsonrpcdefault:"1"`
+	AddressType *string `jsonrpcdefault:"\"*\""`
 }
 
 // NewGetBalanceCmd returns a new instance which can be used to issue a
@@ -242,8 +245,8 @@ func NewGetBalancesCmd() *GetBalancesCmd {
 
 // GetNewAddressCmd defines the getnewaddress JSON-RPC command.
 type GetNewAddressCmd struct {
-	Account     *string
-	AddressType *string // must be one of legacy / p2pkh or p2sh-p2wkh / p2sh-segwit, or p2wkh / bech32
+	Account     *string `jsonrpcdefault:"\"default\""`
+	AddressType *string `jsonrpcdefault:"\"legacy\""`
 }
 
 // NewGetNewAddressCmd returns a new instance which can be used to issue a
@@ -259,7 +262,8 @@ func NewGetNewAddressCmd(account *string) *GetNewAddressCmd {
 
 // GetRawChangeAddressCmd defines the getrawchangeaddress JSON-RPC command.
 type GetRawChangeAddressCmd struct {
-	Account *string
+	Account     *string `jsonrpcdefault:"\"default\""`
+	AddressType *string `jsonrpcdefault:"\"legacy\""`
 }
 
 // NewGetRawChangeAddressCmd returns a new instance which can be used to issue a
@@ -275,8 +279,8 @@ func NewGetRawChangeAddressCmd(account *string) *GetRawChangeAddressCmd {
 
 // GetReceivedByAccountCmd defines the getreceivedbyaccount JSON-RPC command.
 type GetReceivedByAccountCmd struct {
-	Account string
-	MinConf *int `jsonrpcdefault:"1"`
+	Account *string `jsonrpcdefault:"\"default\""`
+	MinConf *int    `jsonrpcdefault:"1"`
 }
 
 // NewGetReceivedByAccountCmd returns a new instance which can be used to issue
@@ -284,7 +288,7 @@ type GetReceivedByAccountCmd struct {
 //
 // The parameters which are pointers indicate they are optional.  Passing nil
 // for optional parameters will use the default value.
-func NewGetReceivedByAccountCmd(account string, minConf *int) *GetReceivedByAccountCmd {
+func NewGetReceivedByAccountCmd(account *string, minConf *int) *GetReceivedByAccountCmd {
 	return &GetReceivedByAccountCmd{
 		Account: account,
 		MinConf: minConf,
@@ -407,7 +411,8 @@ func NewKeyPoolRefillCmd(newSize *uint) *KeyPoolRefillCmd {
 
 // ListAccountsCmd defines the listaccounts JSON-RPC command.
 type ListAccountsCmd struct {
-	MinConf *int `jsonrpcdefault:"1"`
+	MinConf     *int    `jsonrpcdefault:"1"`
+	AddressType *string `jsonrpcdefault:"\"*\""`
 }
 
 // NewListAccountsCmd returns a new instance which can be used to issue a
@@ -501,10 +506,10 @@ func NewListSinceBlockCmd(blockHash *string, targetConfirms *int, includeWatchOn
 
 // ListTransactionsCmd defines the listtransactions JSON-RPC command.
 type ListTransactionsCmd struct {
-	Account          *string
-	Count            *int  `jsonrpcdefault:"10"`
-	From             *int  `jsonrpcdefault:"0"`
-	IncludeWatchOnly *bool `jsonrpcdefault:"false"`
+	Account          *string `jsonrpcdefault:"\"default\""`
+	Count            *int    `jsonrpcdefault:"10"`
+	From             *int    `jsonrpcdefault:"0"`
+	IncludeWatchOnly *bool   `jsonrpcdefault:"false"`
 }
 
 // NewListTransactionsCmd returns a new instance which can be used to issue a
@@ -562,6 +567,7 @@ type SendFromCmd struct {
 	ToAddress   string
 	Amount      float64 // In BTC
 	MinConf     *int    `jsonrpcdefault:"1"`
+	AddressType *string `jsonrpcdefault:"\"*\""`
 	Comment     *string
 	CommentTo   *string
 }
@@ -571,12 +577,15 @@ type SendFromCmd struct {
 //
 // The parameters which are pointers indicate they are optional.  Passing nil
 // for optional parameters will use the default value.
-func NewSendFromCmd(fromAccount, toAddress string, amount float64, minConf *int, comment, commentTo *string) *SendFromCmd {
+func NewSendFromCmd(fromAccount, toAddress string, amount float64,
+	minConf *int, addrType *string, comment, commentTo *string) *SendFromCmd {
+
 	return &SendFromCmd{
 		FromAccount: fromAccount,
 		ToAddress:   toAddress,
 		Amount:      amount,
 		MinConf:     minConf,
+		AddressType: addrType,
 		Comment:     comment,
 		CommentTo:   commentTo,
 	}
@@ -587,6 +596,7 @@ type SendManyCmd struct {
 	FromAccount string
 	Amounts     map[string]float64 `jsonrpcusage:"{\"address\":amount,...}"` // In BTC
 	MinConf     *int               `jsonrpcdefault:"1"`
+	AddressType *string            `jsonrpcdefault:"\"*\""`
 	Comment     *string
 }
 
@@ -595,21 +605,24 @@ type SendManyCmd struct {
 //
 // The parameters which are pointers indicate they are optional.  Passing nil
 // for optional parameters will use the default value.
-func NewSendManyCmd(fromAccount string, amounts map[string]float64, minConf *int, comment *string) *SendManyCmd {
+func NewSendManyCmd(fromAccount string, amounts map[string]float64,
+	minConf *int, addrType *string, comment *string) *SendManyCmd {
 	return &SendManyCmd{
 		FromAccount: fromAccount,
 		Amounts:     amounts,
 		MinConf:     minConf,
+		AddressType: addrType,
 		Comment:     comment,
 	}
 }
 
 // SendToAddressCmd defines the sendtoaddress JSON-RPC command.
 type SendToAddressCmd struct {
-	Address   string
-	Amount    float64
-	Comment   *string
-	CommentTo *string
+	Address     string
+	Amount      float64
+	AddressType *string `jsonrpcdefault:"\"*\""`
+	Comment     *string
+	CommentTo   *string
 }
 
 // NewSendToAddressCmd returns a new instance which can be used to issue a
@@ -617,12 +630,14 @@ type SendToAddressCmd struct {
 //
 // The parameters which are pointers indicate they are optional.  Passing nil
 // for optional parameters will use the default value.
-func NewSendToAddressCmd(address string, amount float64, comment, commentTo *string) *SendToAddressCmd {
+func NewSendToAddressCmd(address string, amount float64, addrType *string,
+	comment, commentTo *string) *SendToAddressCmd {
 	return &SendToAddressCmd{
-		Address:   address,
-		Amount:    amount,
-		Comment:   comment,
-		CommentTo: commentTo,
+		Address:     address,
+		Amount:      amount,
+		AddressType: addrType,
+		Comment:     comment,
+		CommentTo:   commentTo,
 	}
 }
 
@@ -962,8 +977,8 @@ func NewImportMultiCmd(requests []ImportMultiRequest, options *ImportMultiOption
 
 // RescanBlockchainCmd defines the RescanBlockchain JSON-RPC command.
 type RescanBlockchainCmd struct {
-	StartHeight *int64 `jsonrpcdefault:"0"`
-	StopHeight  *int64 `jsonrpcdefault:"0"`
+	StartHeight *int32 `jsonrpcdefault:"0"`
+	StopHeight  *int32
 }
 
 // NewRescanBlockchainCmd returns a new instance which can be used to issue
@@ -971,7 +986,7 @@ type RescanBlockchainCmd struct {
 //
 // The parameters which are pointers indicate they are optional. Passing nil
 // for optional parameters will use the default value.
-func NewRescanBlockchainCmd(startHeight *int64, stopHeight *int64) *RescanBlockchainCmd {
+func NewRescanBlockchainCmd(startHeight *int32, stopHeight *int32) *RescanBlockchainCmd {
 	return &RescanBlockchainCmd{
 		StartHeight: startHeight,
 		StopHeight:  stopHeight,

btcjson/walletsvrcmds_test.go

@@ -287,11 +287,12 @@ func TestWalletSvrCmds(t *testing.T) {
 				return btcjson.NewCmd("getaccountaddress", "acct")
 			},
 			staticCmd: func() interface{} {
-				return btcjson.NewGetAccountAddressCmd("acct")
+				return btcjson.NewGetAccountAddressCmd(btcjson.String("acct"))
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"getaccountaddress","params":["acct"],"id":1}`,
 			unmarshalled: &btcjson.GetAccountAddressCmd{
-				Account: "acct",
+				Account:     btcjson.String("acct"),
+				AddressType: btcjson.String("legacy"),
 			},
 		},
 		{
@@ -300,11 +301,12 @@ func TestWalletSvrCmds(t *testing.T) {
 				return btcjson.NewCmd("getaddressesbyaccount", "acct")
 			},
 			staticCmd: func() interface{} {
-				return btcjson.NewGetAddressesByAccountCmd("acct")
+				return btcjson.NewGetAddressesByAccountCmd(btcjson.String("acct"))
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"getaddressesbyaccount","params":["acct"],"id":1}`,
 			unmarshalled: &btcjson.GetAddressesByAccountCmd{
-				Account: "acct",
+				Account:     btcjson.String("acct"),
+				AddressType: btcjson.String("*"),
 			},
 		},
 		{
@@ -330,8 +332,9 @@ func TestWalletSvrCmds(t *testing.T) {
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"getbalance","params":[],"id":1}`,
 			unmarshalled: &btcjson.GetBalanceCmd{
-				Account: nil,
-				MinConf: btcjson.Int(1),
+				Account:     btcjson.String("default"),
+				MinConf:     btcjson.Int(1),
+				AddressType: btcjson.String("*"),
 			},
 		},
 		{
@@ -344,8 +347,9 @@ func TestWalletSvrCmds(t *testing.T) {
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"getbalance","params":["acct"],"id":1}`,
 			unmarshalled: &btcjson.GetBalanceCmd{
-				Account: btcjson.String("acct"),
-				MinConf: btcjson.Int(1),
+				Account:     btcjson.String("acct"),
+				MinConf:     btcjson.Int(1),
+				AddressType: btcjson.String("*"),
 			},
 		},
 		{
@@ -358,8 +362,9 @@ func TestWalletSvrCmds(t *testing.T) {
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"getbalance","params":["acct",6],"id":1}`,
 			unmarshalled: &btcjson.GetBalanceCmd{
-				Account: btcjson.String("acct"),
-				MinConf: btcjson.Int(6),
+				Account:     btcjson.String("acct"),
+				MinConf:     btcjson.Int(6),
+				AddressType: btcjson.String("*"),
 			},
 		},
 		{
@@ -383,7 +388,8 @@ func TestWalletSvrCmds(t *testing.T) {
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"getnewaddress","params":[],"id":1}`,
 			unmarshalled: &btcjson.GetNewAddressCmd{
-				Account: nil,
+				Account:     btcjson.String("default"),
+				AddressType: btcjson.String("legacy"),
 			},
 		},
 		{
@@ -396,7 +402,8 @@ func TestWalletSvrCmds(t *testing.T) {
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"getnewaddress","params":["acct"],"id":1}`,
 			unmarshalled: &btcjson.GetNewAddressCmd{
-				Account: btcjson.String("acct"),
+				Account:     btcjson.String("acct"),
+				AddressType: btcjson.String("legacy"),
 			},
 		},
 		{
@@ -409,7 +416,8 @@ func TestWalletSvrCmds(t *testing.T) {
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"getrawchangeaddress","params":[],"id":1}`,
 			unmarshalled: &btcjson.GetRawChangeAddressCmd{
-				Account: nil,
+				Account:     btcjson.String("default"),
+				AddressType: btcjson.String("legacy"),
 			},
 		},
 		{
@@ -422,7 +430,8 @@ func TestWalletSvrCmds(t *testing.T) {
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"getrawchangeaddress","params":["acct"],"id":1}`,
 			unmarshalled: &btcjson.GetRawChangeAddressCmd{
-				Account: btcjson.String("acct"),
+				Account:     btcjson.String("acct"),
+				AddressType: btcjson.String("legacy"),
 			},
 		},
 		{
@@ -431,11 +440,11 @@ func TestWalletSvrCmds(t *testing.T) {
 				return btcjson.NewCmd("getreceivedbyaccount", "acct")
 			},
 			staticCmd: func() interface{} {
-				return btcjson.NewGetReceivedByAccountCmd("acct", nil)
+				return btcjson.NewGetReceivedByAccountCmd(btcjson.String("acct"), nil)
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"getreceivedbyaccount","params":["acct"],"id":1}`,
 			unmarshalled: &btcjson.GetReceivedByAccountCmd{
-				Account: "acct",
+				Account: btcjson.String("acct"),
 				MinConf: btcjson.Int(1),
 			},
 		},
@@ -445,11 +454,11 @@ func TestWalletSvrCmds(t *testing.T) {
 				return btcjson.NewCmd("getreceivedbyaccount", "acct", 6)
 			},
 			staticCmd: func() interface{} {
-				return btcjson.NewGetReceivedByAccountCmd("acct", btcjson.Int(6))
+				return btcjson.NewGetReceivedByAccountCmd(btcjson.String("acct"), btcjson.Int(6))
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"getreceivedbyaccount","params":["acct",6],"id":1}`,
 			unmarshalled: &btcjson.GetReceivedByAccountCmd{
-				Account: "acct",
+				Account: btcjson.String("acct"),
 				MinConf: btcjson.Int(6),
 			},
 		},
@@ -601,7 +610,8 @@ func TestWalletSvrCmds(t *testing.T) {
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"listaccounts","params":[],"id":1}`,
 			unmarshalled: &btcjson.ListAccountsCmd{
-				MinConf: btcjson.Int(1),
+				MinConf:     btcjson.Int(1),
+				AddressType: btcjson.String("*"),
 			},
 		},
 		{
@@ -614,7 +624,8 @@ func TestWalletSvrCmds(t *testing.T) {
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"listaccounts","params":[6],"id":1}`,
 			unmarshalled: &btcjson.ListAccountsCmd{
-				MinConf: btcjson.Int(6),
+				MinConf:     btcjson.Int(6),
+				AddressType: btcjson.String("*"),
 			},
 		},
 		{
@@ -844,7 +855,7 @@ func TestWalletSvrCmds(t *testing.T) {
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"listtransactions","params":[],"id":1}`,
 			unmarshalled: &btcjson.ListTransactionsCmd{
-				Account:          nil,
+				Account:          btcjson.String("default"),
 				Count:            btcjson.Int(10),
 				From:             btcjson.Int(0),
 				IncludeWatchOnly: btcjson.Bool(false),
@@ -1002,7 +1013,7 @@ func TestWalletSvrCmds(t *testing.T) {
 				return btcjson.NewCmd("sendfrom", "from", "1Address", 0.5)
 			},
 			staticCmd: func() interface{} {
-				return btcjson.NewSendFromCmd("from", "1Address", 0.5, nil, nil, nil)
+				return btcjson.NewSendFromCmd("from", "1Address", 0.5, nil, nil, nil, nil)
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"sendfrom","params":["from","1Address",0.5],"id":1}`,
 			unmarshalled: &btcjson.SendFromCmd{
@@ -1010,6 +1021,7 @@ func TestWalletSvrCmds(t *testing.T) {
 				ToAddress:   "1Address",
 				Amount:      0.5,
 				MinConf:     btcjson.Int(1),
+				AddressType: btcjson.String("*"),
 				Comment:     nil,
 				CommentTo:   nil,
 			},
@@ -1020,7 +1032,7 @@ func TestWalletSvrCmds(t *testing.T) {
 				return btcjson.NewCmd("sendfrom", "from", "1Address", 0.5, 6)
 			},
 			staticCmd: func() interface{} {
-				return btcjson.NewSendFromCmd("from", "1Address", 0.5, btcjson.Int(6), nil, nil)
+				return btcjson.NewSendFromCmd("from", "1Address", 0.5, btcjson.Int(6), nil, nil, nil)
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"sendfrom","params":["from","1Address",0.5,6],"id":1}`,
 			unmarshalled: &btcjson.SendFromCmd{
@@ -1028,6 +1040,7 @@ func TestWalletSvrCmds(t *testing.T) {
 				ToAddress:   "1Address",
 				Amount:      0.5,
 				MinConf:     btcjson.Int(6),
+				AddressType: btcjson.String("*"),
 				Comment:     nil,
 				CommentTo:   nil,
 			},
@@ -1035,37 +1048,59 @@ func TestWalletSvrCmds(t *testing.T) {
 		{
 			name: "sendfrom optional2",
 			newCmd: func() (interface{}, error) {
-				return btcjson.NewCmd("sendfrom", "from", "1Address", 0.5, 6, "comment")
+				return btcjson.NewCmd("sendfrom", "from", "1Address", 0.5, 6, "legacy")
 			},
 			staticCmd: func() interface{} {
-				return btcjson.NewSendFromCmd("from", "1Address", 0.5, btcjson.Int(6),
-					btcjson.String("comment"), nil)
+				return btcjson.NewSendFromCmd("from", "1Address", 0.5, btcjson.Int(6), btcjson.String("legacy"),
+					nil, nil)
 			},
-			marshalled: `{"jsonrpc":"1.0","method":"sendfrom","params":["from","1Address",0.5,6,"comment"],"id":1}`,
+			marshalled: `{"jsonrpc":"1.0","method":"sendfrom","params":["from","1Address",0.5,6,"legacy"],"id":1}`,
 			unmarshalled: &btcjson.SendFromCmd{
 				FromAccount: "from",
 				ToAddress:   "1Address",
 				Amount:      0.5,
 				MinConf:     btcjson.Int(6),
-				Comment:     btcjson.String("comment"),
+				AddressType: btcjson.String("legacy"),
+				Comment:     nil,
 				CommentTo:   nil,
 			},
 		},
 		{
 			name: "sendfrom optional3",
 			newCmd: func() (interface{}, error) {
-				return btcjson.NewCmd("sendfrom", "from", "1Address", 0.5, 6, "comment", "commentto")
+				return btcjson.NewCmd("sendfrom", "from", "1Address", 0.5, 6, "legacy", "comment")
 			},
 			staticCmd: func() interface{} {
-				return btcjson.NewSendFromCmd("from", "1Address", 0.5, btcjson.Int(6),
-					btcjson.String("comment"), btcjson.String("commentto"))
+				return btcjson.NewSendFromCmd("from", "1Address", 0.5, btcjson.Int(6), btcjson.String("legacy"),
+					btcjson.String("comment"), nil)
 			},
-			marshalled: `{"jsonrpc":"1.0","method":"sendfrom","params":["from","1Address",0.5,6,"comment","commentto"],"id":1}`,
+			marshalled: `{"jsonrpc":"1.0","method":"sendfrom","params":["from","1Address",0.5,6,"legacy","comment"],"id":1}`,
 			unmarshalled: &btcjson.SendFromCmd{
 				FromAccount: "from",
 				ToAddress:   "1Address",
 				Amount:      0.5,
 				MinConf:     btcjson.Int(6),
+				AddressType: btcjson.String("legacy"),
+				Comment:     btcjson.String("comment"),
+				CommentTo:   nil,
+			},
+		},
+		{
+			name: "sendfrom optional4",
+			newCmd: func() (interface{}, error) {
+				return btcjson.NewCmd("sendfrom", "from", "1Address", 0.5, 6, "legacy", "comment", "commentto")
+			},
+			staticCmd: func() interface{} {
+				return btcjson.NewSendFromCmd("from", "1Address", 0.5, btcjson.Int(6), btcjson.String("legacy"),
+					btcjson.String("comment"), btcjson.String("commentto"))
+			},
+			marshalled: `{"jsonrpc":"1.0","method":"sendfrom","params":["from","1Address",0.5,6,"legacy","comment","commentto"],"id":1}`,
+			unmarshalled: &btcjson.SendFromCmd{
+				FromAccount: "from",
+				ToAddress:   "1Address",
+				Amount:      0.5,
+				MinConf:     btcjson.Int(6),
+				AddressType: btcjson.String("legacy"),
 				Comment:     btcjson.String("comment"),
 				CommentTo:   btcjson.String("commentto"),
 			},
@@ -1077,13 +1112,14 @@ func TestWalletSvrCmds(t *testing.T) {
 			},
 			staticCmd: func() interface{} {
 				amounts := map[string]float64{"1Address": 0.5}
-				return btcjson.NewSendManyCmd("from", amounts, nil, nil)
+				return btcjson.NewSendManyCmd("from", amounts, nil, nil, nil)
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"sendmany","params":["from",{"1Address":0.5}],"id":1}`,
 			unmarshalled: &btcjson.SendManyCmd{
 				FromAccount: "from",
 				Amounts:     map[string]float64{"1Address": 0.5},
 				MinConf:     btcjson.Int(1),
+				AddressType: btcjson.String("*"),
 				Comment:     nil,
 			},
 		},
@@ -1094,30 +1130,50 @@ func TestWalletSvrCmds(t *testing.T) {
 			},
 			staticCmd: func() interface{} {
 				amounts := map[string]float64{"1Address": 0.5}
-				return btcjson.NewSendManyCmd("from", amounts, btcjson.Int(6), nil)
+				return btcjson.NewSendManyCmd("from", amounts, btcjson.Int(6), nil, nil)
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"sendmany","params":["from",{"1Address":0.5},6],"id":1}`,
 			unmarshalled: &btcjson.SendManyCmd{
 				FromAccount: "from",
 				Amounts:     map[string]float64{"1Address": 0.5},
 				MinConf:     btcjson.Int(6),
+				AddressType: btcjson.String("*"),
 				Comment:     nil,
 			},
 		},
 		{
 			name: "sendmany optional2",
 			newCmd: func() (interface{}, error) {
-				return btcjson.NewCmd("sendmany", "from", `{"1Address":0.5}`, 6, "comment")
+				return btcjson.NewCmd("sendmany", "from", `{"1Address":0.5}`, 6, "legacy")
 			},
 			staticCmd: func() interface{} {
 				amounts := map[string]float64{"1Address": 0.5}
-				return btcjson.NewSendManyCmd("from", amounts, btcjson.Int(6), btcjson.String("comment"))
+				return btcjson.NewSendManyCmd("from", amounts, btcjson.Int(6), btcjson.String("legacy"), nil)
 			},
-			marshalled: `{"jsonrpc":"1.0","method":"sendmany","params":["from",{"1Address":0.5},6,"comment"],"id":1}`,
+			marshalled: `{"jsonrpc":"1.0","method":"sendmany","params":["from",{"1Address":0.5},6,"legacy"],"id":1}`,
 			unmarshalled: &btcjson.SendManyCmd{
 				FromAccount: "from",
 				Amounts:     map[string]float64{"1Address": 0.5},
 				MinConf:     btcjson.Int(6),
+				AddressType: btcjson.String("legacy"),
+				Comment:     nil,
+			},
+		},
+		{
+			name: "sendmany optional3",
+			newCmd: func() (interface{}, error) {
+				return btcjson.NewCmd("sendmany", "from", `{"1Address":0.5}`, 6, "legacy", "comment")
+			},
+			staticCmd: func() interface{} {
+				amounts := map[string]float64{"1Address": 0.5}
+				return btcjson.NewSendManyCmd("from", amounts, btcjson.Int(6), btcjson.String("legacy"), btcjson.String("comment"))
+			},
+			marshalled: `{"jsonrpc":"1.0","method":"sendmany","params":["from",{"1Address":0.5},6,"legacy","comment"],"id":1}`,
+			unmarshalled: &btcjson.SendManyCmd{
+				FromAccount: "from",
+				Amounts:     map[string]float64{"1Address": 0.5},
+				MinConf:     btcjson.Int(6),
+				AddressType: btcjson.String("legacy"),
 				Comment:     btcjson.String("comment"),
 			},
 		},
@@ -1127,31 +1183,50 @@ func TestWalletSvrCmds(t *testing.T) {
 				return btcjson.NewCmd("sendtoaddress", "1Address", 0.5)
 			},
 			staticCmd: func() interface{} {
-				return btcjson.NewSendToAddressCmd("1Address", 0.5, nil, nil)
+				return btcjson.NewSendToAddressCmd("1Address", 0.5, nil, nil, nil)
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"sendtoaddress","params":["1Address",0.5],"id":1}`,
 			unmarshalled: &btcjson.SendToAddressCmd{
-				Address:   "1Address",
-				Amount:    0.5,
-				Comment:   nil,
-				CommentTo: nil,
+				Address:     "1Address",
+				Amount:      0.5,
+				AddressType: btcjson.String("*"),
+				Comment:     nil,
+				CommentTo:   nil,
 			},
 		},
 		{
 			name: "sendtoaddress optional1",
 			newCmd: func() (interface{}, error) {
-				return btcjson.NewCmd("sendtoaddress", "1Address", 0.5, "comment", "commentto")
+				return btcjson.NewCmd("sendtoaddress", "1Address", 0.5, "legacy")
 			},
 			staticCmd: func() interface{} {
-				return btcjson.NewSendToAddressCmd("1Address", 0.5, btcjson.String("comment"),
+				return btcjson.NewSendToAddressCmd("1Address", 0.5, btcjson.String("legacy"), nil, nil)
+			},
+			marshalled: `{"jsonrpc":"1.0","method":"sendtoaddress","params":["1Address",0.5,"legacy"],"id":1}`,
+			unmarshalled: &btcjson.SendToAddressCmd{
+				Address:     "1Address",
+				Amount:      0.5,
+				AddressType: btcjson.String("legacy"),
+				Comment:     nil,
+				CommentTo:   nil,
+			},
+		},
+		{
+			name: "sendtoaddress optional2",
+			newCmd: func() (interface{}, error) {
+				return btcjson.NewCmd("sendtoaddress", "1Address", 0.5, "legacy", "comment", "commentto")
+			},
+			staticCmd: func() interface{} {
+				return btcjson.NewSendToAddressCmd("1Address", 0.5, btcjson.String("legacy"), btcjson.String("comment"),
 					btcjson.String("commentto"))
 			},
-			marshalled: `{"jsonrpc":"1.0","method":"sendtoaddress","params":["1Address",0.5,"comment","commentto"],"id":1}`,
+			marshalled: `{"jsonrpc":"1.0","method":"sendtoaddress","params":["1Address",0.5,"legacy","comment","commentto"],"id":1}`,
 			unmarshalled: &btcjson.SendToAddressCmd{
-				Address:   "1Address",
-				Amount:    0.5,
-				Comment:   btcjson.String("comment"),
-				CommentTo: btcjson.String("commentto"),
+				Address:     "1Address",
+				Amount:      0.5,
+				AddressType: btcjson.String("legacy"),
+				Comment:     btcjson.String("comment"),
+				CommentTo:   btcjson.String("commentto"),
 			},
 		},
 		{

btcjson/walletsvrresults.go

@@ -174,6 +174,7 @@ type GetTransactionResult struct {
 	TimeReceived    int64                         `json:"timereceived"`
 	Details         []GetTransactionDetailsResult `json:"details"`
 	Hex             string                        `json:"hex"`
+	Generated       bool                          `json:"generated"`
 }
 
 type ScanningOrFalse struct {
@@ -288,7 +289,6 @@ type ListReceivedByAccountResult struct {
 // ListReceivedByAddressResult models the data from the listreceivedbyaddress
 // command.
 type ListReceivedByAddressResult struct {
-	Account           string   `json:"account"`
 	Address           string   `json:"address"`
 	Amount            float64  `json:"amount"`
 	Confirmations     uint64   `json:"confirmations"`
@@ -319,8 +319,8 @@ type ListUnspentResult struct {
 
 // RescanBlockchainResult models the data returned from the rescanblockchain command.
 type RescanBlockchainResult struct {
-	StartHeight int64 `json:"start_height"`
-	StoptHeight int64 `json:"stop_height"`
+	StartHeight int32 `json:"start_height"`
+	StoptHeight int32 `json:"stop_height"`
 }
 
 // SignRawTransactionError models the data that contains script verification

btcjson/walletsvrwscmds.go

@@ -40,7 +40,7 @@ func NewExportWatchingWalletCmd(account *string, download *bool) *ExportWatching
 
 // GetUnconfirmedBalanceCmd defines the getunconfirmedbalance JSON-RPC command.
 type GetUnconfirmedBalanceCmd struct {
-	Account *string
+	Account *string `jsonrpcdefault:"\"default\""`
 }
 
 // NewGetUnconfirmedBalanceCmd returns a new instance which can be used to issue
@@ -58,7 +58,7 @@ func NewGetUnconfirmedBalanceCmd(account *string) *GetUnconfirmedBalanceCmd {
 // command.
 type ListAddressTransactionsCmd struct {
 	Addresses []string
-	Account   *string
+	Account   *string `jsonrpcdefault:"\"default\""`
 }
 
 // NewListAddressTransactionsCmd returns a new instance which can be used to
@@ -75,7 +75,7 @@ func NewListAddressTransactionsCmd(addresses []string, account *string) *ListAdd
 
 // ListAllTransactionsCmd defines the listalltransactions JSON-RPC command.
 type ListAllTransactionsCmd struct {
-	Account *string
+	Account *string `jsonrpcdefault:"\"default\""`
 }
 
 // NewListAllTransactionsCmd returns a new instance which can be used to issue a

btcjson/walletsvrwscmds_test.go

@@ -71,7 +71,7 @@ func TestWalletSvrWsCmds(t *testing.T) {
 		{
 			name: "exportwatchingwallet optional2",
 			newCmd: func() (interface{}, error) {
-				return btcjson.NewCmd("exportwatchingwallet", "acct", true)
+				return btcjson.NewCmd("exportwatchingwallet", btcjson.String("acct"), true)
 			},
 			staticCmd: func() interface{} {
 				return btcjson.NewExportWatchingWalletCmd(btcjson.String("acct"),
@@ -93,7 +93,7 @@ func TestWalletSvrWsCmds(t *testing.T) {
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"getunconfirmedbalance","params":[],"id":1}`,
 			unmarshalled: &btcjson.GetUnconfirmedBalanceCmd{
-				Account: nil,
+				Account: btcjson.String("default"),
 			},
 		},
 		{
@@ -120,7 +120,7 @@ func TestWalletSvrWsCmds(t *testing.T) {
 			marshalled: `{"jsonrpc":"1.0","method":"listaddresstransactions","params":[["1Address"]],"id":1}`,
 			unmarshalled: &btcjson.ListAddressTransactionsCmd{
 				Addresses: []string{"1Address"},
-				Account:   nil,
+				Account:   btcjson.String("default"),
 			},
 		},
 		{
@@ -148,7 +148,7 @@ func TestWalletSvrWsCmds(t *testing.T) {
 			},
 			marshalled: `{"jsonrpc":"1.0","method":"listalltransactions","params":[],"id":1}`,
 			unmarshalled: &btcjson.ListAllTransactionsCmd{
-				Account: nil,
+				Account: btcjson.String("default"),
 			},
 		},
 		{

claimtrie/claimtrie.go

@@ -4,9 +4,7 @@ import (
 	"bytes"
 	"fmt"
 	"path/filepath"
-	"runtime"
 	"sort"
-	"sync"
 
 	"github.com/pkg/errors"
 
@@ -249,17 +247,17 @@ func (ct *ClaimTrie) AppendBlock(temporary bool) error {
 	names = append(names, expirations...)
 	names = removeDuplicates(names)
 
-	nhns := ct.makeNameHashNext(names, false, nil)
-	for nhn := range nhns {
+	for _, name := range names {
 
-		ct.merkleTrie.Update(nhn.Name, nhn.Hash, true)
-		if nhn.Next <= 0 {
+		hash, next := ct.nodeManager.Hash(name)
+		ct.merkleTrie.Update(name, hash, true)
+		if next <= 0 {
 			continue
 		}
 
-		newName := normalization.NormalizeIfNecessary(nhn.Name, nhn.Next)
+		newName := normalization.NormalizeIfNecessary(name, next)
 		updateNames = append(updateNames, newName)
-		updateHeights = append(updateHeights, nhn.Next)
+		updateHeights = append(updateHeights, next)
 	}
 	if !temporary && len(updateNames) > 0 {
 		err = ct.temporalRepo.SetNodesAt(updateNames, updateHeights)
@@ -356,22 +354,29 @@ func (ct *ClaimTrie) ResetHeight(height int32) error {
 }
 
 func (ct *ClaimTrie) runFullTrieRebuild(names [][]byte, interrupt <-chan struct{}) {
-	var nhns chan NameHashNext
 	if names == nil {
 		node.Log("Building the entire claim trie in RAM...")
 		ct.claimLogger = newClaimProgressLogger("Processed", node.GetLogger())
-		nhns = ct.makeNameHashNext(nil, true, interrupt)
-	} else {
-		ct.claimLogger = nil
-		nhns = ct.makeNameHashNext(names, false, interrupt)
-	}
 
-	for nhn := range nhns {
-		ct.merkleTrie.Update(nhn.Name, nhn.Hash, false)
-		if ct.claimLogger != nil {
-			ct.claimLogger.LogName(nhn.Name)
+		ct.nodeManager.IterateNames(func(name []byte) bool {
+			if interruptRequested(interrupt) {
+				return false
+			}
+			clone := make([]byte, len(name))
+			copy(clone, name)
+			hash, _ := ct.nodeManager.Hash(clone)
+			ct.merkleTrie.Update(clone, hash, false)
+			ct.claimLogger.LogName(name)
+			return true
+		})
+
+	} else {
+		for _, name := range names {
+			hash, _ := ct.nodeManager.Hash(name)
+			ct.merkleTrie.Update(name, hash, false)
 		}
 	}
+
 }
 
 // MerkleHash returns the Merkle Hash of the claimTrie.
@@ -437,12 +442,6 @@ func (ct *ClaimTrie) FlushToDisk() {
 	}
 }
 
-type NameHashNext struct {
-	Name []byte
-	Hash *chainhash.Hash
-	Next int32
-}
-
 func interruptRequested(interrupted <-chan struct{}) bool {
 	select {
 	case <-interrupted: // should never block on nil
@@ -452,53 +451,3 @@ func interruptRequested(interrupted <-chan struct{}) bool {
 
 	return false
 }
-
-func (ct *ClaimTrie) makeNameHashNext(names [][]byte, all bool, interrupt <-chan struct{}) chan NameHashNext {
-	inputs := make(chan []byte, 512)
-	outputs := make(chan NameHashNext, 512)
-
-	var wg sync.WaitGroup
-	hashComputationWorker := func() {
-		for name := range inputs {
-			hash, next := ct.nodeManager.Hash(name)
-			outputs <- NameHashNext{name, hash, next}
-		}
-		wg.Done()
-	}
-
-	threads := int(0.8 * float32(runtime.GOMAXPROCS(0)))
-	if threads < 1 {
-		threads = 1
-	}
-	for threads > 0 {
-		threads--
-		wg.Add(1)
-		go hashComputationWorker()
-	}
-	go func() {
-		if all {
-			ct.nodeManager.IterateNames(func(name []byte) bool {
-				if interruptRequested(interrupt) {
-					return false
-				}
-				clone := make([]byte, len(name))
-				copy(clone, name) // iteration name buffer is reused on future loops
-				inputs <- clone
-				return true
-			})
-		} else {
-			for _, name := range names {
-				if interruptRequested(interrupt) {
-					break
-				}
-				inputs <- name
-			}
-		}
-		close(inputs)
-	}()
-	go func() {
-		wg.Wait()
-		close(outputs)
-	}()
-	return outputs
-}

claimtrie/node/cache.go

@@ -0,0 +1,85 @@
+package node
+
+import (
+	"container/list"
+
+	"github.com/lbryio/lbcd/claimtrie/change"
+)
+
+type cacheLeaf struct {
+	node    *Node
+	element *list.Element
+	changes []change.Change
+	height  int32
+}
+
+type Cache struct {
+	nodes map[string]*cacheLeaf
+	order *list.List
+	limit int
+}
+
+func (nc *Cache) insert(name []byte, n *Node, height int32) {
+	key := string(name)
+
+	existing := nc.nodes[key]
+	if existing != nil {
+		existing.node = n
+		existing.height = height
+		existing.changes = nil
+		nc.order.MoveToFront(existing.element)
+		return
+	}
+
+	for nc.order.Len() >= nc.limit {
+		// TODO: maybe ensure that we don't remove nodes that have a lot of changes?
+		delete(nc.nodes, nc.order.Back().Value.(string))
+		nc.order.Remove(nc.order.Back())
+	}
+
+	element := nc.order.PushFront(key)
+	nc.nodes[key] = &cacheLeaf{node: n, element: element, height: height}
+}
+
+func (nc *Cache) fetch(name []byte, height int32) (*Node, []change.Change, int32) {
+	key := string(name)
+
+	existing := nc.nodes[key]
+	if existing != nil && existing.height <= height {
+		nc.order.MoveToFront(existing.element)
+		return existing.node, existing.changes, existing.height
+	}
+	return nil, nil, -1
+}
+
+func (nc *Cache) addChanges(changes []change.Change, height int32) {
+	for _, c := range changes {
+		key := string(c.Name)
+		existing := nc.nodes[key]
+		if existing != nil && existing.height <= height {
+			existing.changes = append(existing.changes, c)
+		}
+	}
+}
+
+func (nc *Cache) drop(names [][]byte) {
+	for _, name := range names {
+		key := string(name)
+		existing := nc.nodes[key]
+		if existing != nil {
+			// we can't roll it backwards because we don't know its previous height value; just toast it
+			delete(nc.nodes, key)
+			nc.order.Remove(existing.element)
+		}
+	}
+}
+
+func (nc *Cache) clear() {
+	nc.nodes = map[string]*cacheLeaf{}
+	nc.order = list.New()
+	// we'll let the GC sort out the remains...
+}
+
+func NewCache(limit int) *Cache {
+	return &Cache{limit: limit, nodes: map[string]*cacheLeaf{}, order: list.New()}
+}

claimtrie/node/manager.go

@@ -21,6 +21,7 @@ type Manager interface {
 	IterateNames(predicate func(name []byte) bool)
 	Hash(name []byte) (*chainhash.Hash, int32)
 	Flush() error
+	ClearCache()
 }
 
 type BaseManager struct {
@@ -30,31 +31,62 @@ type BaseManager struct {
 	changes []change.Change
 
 	tempChanges map[string][]change.Change
+
+	cache *Cache
 }
 
 func NewBaseManager(repo Repo) (*BaseManager, error) {
 
 	nm := &BaseManager{
-		repo: repo,
+		repo:  repo,
+		cache: NewCache(10000), // TODO: how many should we cache?
 	}
 
 	return nm, nil
 }
 
+func (nm *BaseManager) ClearCache() {
+	nm.cache.clear()
+}
+
 func (nm *BaseManager) NodeAt(height int32, name []byte) (*Node, error) {
 
-	changes, err := nm.repo.LoadChanges(name)
-	if err != nil {
-		return nil, errors.Wrap(err, "in load changes")
-	}
+	n, changes, oldHeight := nm.cache.fetch(name, height)
+	if n == nil {
+		changes, err := nm.repo.LoadChanges(name)
+		if err != nil {
+			return nil, errors.Wrap(err, "in load changes")
+		}
 
-	if nm.tempChanges != nil { // making an assumption that we only ever have tempChanges for a single block
-		changes = append(changes, nm.tempChanges[string(name)]...)
-	}
+		if nm.tempChanges != nil { // making an assumption that we only ever have tempChanges for a single block
+			changes = append(changes, nm.tempChanges[string(name)]...)
+		}
 
-	n, err := nm.newNodeFromChanges(changes, height)
-	if err != nil {
-		return nil, errors.Wrap(err, "in new node")
+		n, err = nm.newNodeFromChanges(changes, height)
+		if err != nil {
+			return nil, errors.Wrap(err, "in new node")
+		}
+		// TODO: how can we tell what needs to be cached?
+		if nm.tempChanges == nil && height == nm.height && n != nil && (len(changes) > 4 || len(name) < 12) {
+			nm.cache.insert(name, n, height)
+		}
+	} else {
+		if nm.tempChanges != nil { // making an assumption that we only ever have tempChanges for a single block
+			changes = append(changes, nm.tempChanges[string(name)]...)
+			n = n.Clone()
+		} else if height != nm.height {
+			n = n.Clone()
+		}
+		updated, err := nm.updateFromChanges(n, changes, height)
+		if err != nil {
+			return nil, errors.Wrap(err, "in update from changes")
+		}
+		if !updated {
+			n.AdjustTo(oldHeight, height, name)
+		}
+		if nm.tempChanges == nil && height == nm.height {
+			nm.cache.insert(name, n, height)
+		}
 	}
 
 	return n, nil
@@ -66,17 +98,13 @@ func (nm *BaseManager) node(name []byte) (*Node, error) {
 	return nm.NodeAt(nm.height, name)
 }
 
-// newNodeFromChanges returns a new Node constructed from the changes.
-// The changes must preserve their order received.
-func (nm *BaseManager) newNodeFromChanges(changes []change.Change, height int32) (*Node, error) {
+func (nm *BaseManager) updateFromChanges(n *Node, changes []change.Change, height int32) (bool, error) {
 
-	if len(changes) == 0 {
-		return nil, nil
-	}
-
-	n := New()
-	previous := changes[0].Height
 	count := len(changes)
+	if count == 0 {
+		return false, nil
+	}
+	previous := changes[0].Height
 
 	for i, chg := range changes {
 		if chg.Height < previous {
@@ -95,15 +123,37 @@ func (nm *BaseManager) newNodeFromChanges(changes []change.Change, height int32)
 		delay := nm.getDelayForName(n, chg)
 		err := n.ApplyChange(chg, delay)
 		if err != nil {
-			return nil, errors.Wrap(err, "in apply change")
+			return false, errors.Wrap(err, "in apply change")
 		}
 	}
 
 	if count <= 0 {
-		return nil, nil
+		// we applied no changes, which means we shouldn't exist if we had all the changes
+		// or might mean nothing significant if we are applying a partial changeset
+		return false, nil
 	}
 	lastChange := changes[count-1]
-	return n.AdjustTo(lastChange.Height, height, lastChange.Name), nil
+	n.AdjustTo(lastChange.Height, height, lastChange.Name)
+	return true, nil
+}
+
+// newNodeFromChanges returns a new Node constructed from the changes.
+// The changes must preserve their order received.
+func (nm *BaseManager) newNodeFromChanges(changes []change.Change, height int32) (*Node, error) {
+
+	if len(changes) == 0 {
+		return nil, nil
+	}
+
+	n := New()
+	updated, err := nm.updateFromChanges(n, changes, height)
+	if err != nil {
+		return nil, errors.Wrap(err, "in update from changes")
+	}
+	if updated {
+		return n, nil
+	}
+	return nil, nil
 }
 
 func (nm *BaseManager) AppendChange(chg change.Change) {
@@ -220,6 +270,7 @@ func (nm *BaseManager) IncrementHeightTo(height int32, temporary bool) ([][]byte
 	}
 
 	if !temporary {
+		nm.cache.addChanges(nm.changes, height)
 		if err := nm.repo.AppendChanges(nm.changes); err != nil { // destroys names
 			return nil, errors.Wrap(err, "in append changes")
 		}
@@ -255,6 +306,8 @@ func (nm *BaseManager) DecrementHeightTo(affectedNames [][]byte, height int32) (
 				return affectedNames, errors.Wrap(err, "in drop changes")
 			}
 		}
+
+		nm.cache.drop(affectedNames)
 	}
 	nm.height = height
 

claimtrie/node/node.go

@@ -110,7 +110,7 @@ func (n *Node) ApplyChange(chg change.Change, delay int32) error {
 }
 
 // AdjustTo activates claims and computes takeovers until it reaches the specified height.
-func (n *Node) AdjustTo(height, maxHeight int32, name []byte) *Node {
+func (n *Node) AdjustTo(height, maxHeight int32, name []byte) {
 	changed := n.handleExpiredAndActivated(height) > 0
 	n.updateTakeoverHeight(height, name, changed)
 	if maxHeight > height {
@@ -120,7 +120,6 @@ func (n *Node) AdjustTo(height, maxHeight int32, name []byte) *Node {
 			height = h
 		}
 	}
-	return n
 }
 
 func (n *Node) updateTakeoverHeight(height int32, name []byte, refindBest bool) {
@@ -340,3 +339,28 @@ func (n *Node) SortClaimsByBid() {
 		return OutPointLess(n.Claims[j].OutPoint, n.Claims[i].OutPoint)
 	})
 }
+
+func (n *Node) Clone() *Node {
+	clone := New()
+	if n.SupportSums != nil {
+		clone.SupportSums = map[string]int64{}
+		for key, value := range n.SupportSums {
+			clone.SupportSums[key] = value
+		}
+	}
+	clone.Supports = make(ClaimList, len(n.Supports))
+	for i, support := range n.Supports {
+		clone.Supports[i] = &Claim{}
+		*clone.Supports[i] = *support
+	}
+	clone.Claims = make(ClaimList, len(n.Claims))
+	for i, claim := range n.Claims {
+		clone.Claims[i] = &Claim{}
+		*clone.Claims[i] = *claim
+	}
+	clone.TakenOverAt = n.TakenOverAt
+	if n.BestClaim != nil {
+		clone.BestClaim = clone.Claims.find(byID(n.BestClaim.ClaimID))
+	}
+	return clone
+}

claimtrie/node/normalizing_manager.go

@@ -34,6 +34,7 @@ func (nm *NormalizingManager) IncrementHeightTo(height int32, temporary bool) ([
 func (nm *NormalizingManager) DecrementHeightTo(affectedNames [][]byte, height int32) ([][]byte, error) {
 	if nm.normalizedAt > height {
 		nm.normalizedAt = -1
+		nm.ClearCache()
 	}
 	return nm.Manager.DecrementHeightTo(affectedNames, height)
 }
@@ -110,5 +111,7 @@ func (nm *NormalizingManager) addNormalizationForkChangesIfNecessary(height int3
 
 		return true
 	}
+
+	nm.Manager.ClearCache()
 	nm.Manager.IterateNames(predicate)
 }

cmd/lbcctl/config.go

@@ -111,6 +111,8 @@ type config struct {
 	SigNet         bool   `long:"signet" description:"Connect to signet (default RPC server: localhost:49245)"`
 	Wallet         bool   `long:"wallet" description:"Connect to wallet RPC server instead (default: localhost:9244, testnet: localhost:19244, regtest: localhost:29244)"`
 	ShowVersion    bool   `short:"V" long:"version" description:"Display version information and exit"`
+	Timed          bool   `short:"t" long:"timed" description:"Display RPC response time"`
+	Quiet          bool   `short:"q" long:"quiet" description:"Do not output results to stdout"`
 }
 
 // normalizeAddress returns addr with the passed default port appended if

cmd/lbcctl/lbcctl.go

@@ -9,6 +9,7 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"time"
 
 	"github.com/lbryio/lbcd/btcjson"
 )
@@ -133,6 +134,8 @@ func main() {
 		os.Exit(1)
 	}
 
+	started := time.Now()
+
 	// Send the JSON-RPC request to the server using the user-specified
 	// connection configuration.
 	result, err := sendPostRequest(marshalledJSON, cfg)
@@ -141,6 +144,16 @@ func main() {
 		os.Exit(1)
 	}
 
+	if cfg.Timed {
+		elapsed := time.Since(started)
+		defer fmt.Fprintf(os.Stderr, "%s\n", elapsed)
+	}
+
+	var output io.Writer = os.Stdout
+	if cfg.Quiet {
+		output = io.Discard
+	}
+
 	// Choose how to display the result based on its type.
 	strResult := string(result)
 	if strings.HasPrefix(strResult, "{") || strings.HasPrefix(strResult, "[") {
@@ -150,7 +163,7 @@ func main() {
 				err)
 			os.Exit(1)
 		}
-		fmt.Println(dst.String())
+		fmt.Fprintln(output, dst.String())
 
 	} else if strings.HasPrefix(strResult, `"`) {
 		var str string
@@ -159,9 +172,9 @@ func main() {
 				err)
 			os.Exit(1)
 		}
-		fmt.Println(str)
+		fmt.Fprintln(output, str)
 
 	} else if strResult != "null" {
-		fmt.Println(strResult)
+		fmt.Fprintln(output, strResult)
 	}
 }

contrib/showminer.sh

@@ -0,0 +1,42 @@
+#! /bin/bash
+
+read -r -d '' help << EOM
+$0 - helper script for displaying miner of a mined block.
+
+Options:
+
+    -h Display this message.
+
+    --height Specify blockheight.
+    --hash Specify blockhash.
+EOM
+
+while getopts ":h-:" optchar; do
+	case "${optchar}" in
+		-)
+			case "${OPTARG}" in
+				hash)
+					blockhash="${!OPTIND}"; OPTIND=$(( $OPTIND + 1 ))
+					;;
+				height)
+					blockheight="${!OPTIND}"; OPTIND=$(( $OPTIND + 1 ))
+					blockhash=$(lbcctl getblockhash ${blockheight})
+					;;
+				*) echo "Unknown long option --${OPTARG}" >&2; exit -2 ;;
+                        esac
+        ;;
+		h) printf "${help}\n\n"; exit 2;;
+		*) echo "Unknown option -${OPTARG}" >&2; exit -2;;
+	esac
+done
+
+
+block=$(lbcctl getblock $blockhash)
+blockheight=$(lbcctl getblock $blockhash | jq -r .height)
+
+coinbase_txid=$(echo ${block} | jq -r '.tx[0]')
+coinbase_raw=$(lbcctl getrawtransaction ${coinbase_txid} 1)
+coinbase=$(echo ${coinbase_raw} | jq '.vin[0].coinbase')
+miner=$(echo ${coinbase} | grep -o '2f.*2f' | xxd -r -p | strings)
+
+echo ${blockheight}: ${blockhash}: ${miner}

integration/rpcserver_test.go

@@ -13,12 +13,17 @@ import (
 	"fmt"
 	"os"
 	"runtime/debug"
+	"sort"
 	"testing"
+	"time"
 
 	"github.com/lbryio/lbcd/chaincfg"
 	"github.com/lbryio/lbcd/chaincfg/chainhash"
 	"github.com/lbryio/lbcd/integration/rpctest"
 	"github.com/lbryio/lbcd/rpcclient"
+	"github.com/lbryio/lbcd/txscript"
+	"github.com/lbryio/lbcd/wire"
+	"github.com/lbryio/lbcutil"
 )
 
 func testGetBestBlock(r *rpctest.Harness, t *testing.T) {
@@ -133,13 +138,278 @@ func testBulkClient(r *rpctest.Harness, t *testing.T) {
 			t.Fatalf("expected hash %s  to be in generated hash list", blockHash)
 		}
 	}
+}
 
+func testGetBlockStats(r *rpctest.Harness, t *testing.T) {
+	t.Parallel()
+
+	baseFeeRate := int64(10)
+	txValue := int64(50000000)
+	txQuantity := 10
+	txs := make([]*lbcutil.Tx, txQuantity)
+	fees := make([]int64, txQuantity)
+	sizes := make([]int64, txQuantity)
+	feeRates := make([]int64, txQuantity)
+	var outputCount int
+
+	// Generate test sample.
+	for i := 0; i < txQuantity; i++ {
+		address, err := r.NewAddress()
+		if err != nil {
+			t.Fatalf("Unable to generate address: %v", err)
+		}
+
+		pkScript, err := txscript.PayToAddrScript(address)
+		if err != nil {
+			t.Fatalf("Unable to generate PKScript: %v", err)
+		}
+
+		// This feerate is not the actual feerate. See comment below.
+		feeRate := baseFeeRate * int64(i)
+
+		tx, err := r.CreateTransaction([]*wire.TxOut{wire.NewTxOut(txValue, pkScript)}, lbcutil.Amount(feeRate), true)
+		if err != nil {
+			t.Fatalf("Unable to generate segwit transaction: %v", err)
+		}
+
+		txs[i] = lbcutil.NewTx(tx)
+		sizes[i] = int64(tx.SerializeSize())
+
+		// memWallet.fundTx makes some assumptions when calculating fees.
+		// For instance, it assumes the signature script has exactly 108 bytes
+		// and it does not account for the size of the change output.
+		// This needs to be taken into account when getting the true feerate.
+		scriptSigOffset := 108 - len(tx.TxIn[0].SignatureScript)
+		changeOutputSize := tx.TxOut[len(tx.TxOut)-1].SerializeSize()
+		fees[i] = (sizes[i] + int64(scriptSigOffset) - int64(changeOutputSize)) * feeRate
+		feeRates[i] = fees[i] / sizes[i]
+
+		outputCount += len(tx.TxOut)
+	}
+
+	stats := func(slice []int64) (int64, int64, int64, int64, int64) {
+		var total, average, min, max, median int64
+		min = slice[0]
+		length := len(slice)
+		for _, item := range slice {
+			if min > item {
+				min = item
+			}
+			if max < item {
+				max = item
+			}
+			total += item
+		}
+		average = total / int64(length)
+		sort.Slice(slice, func(i, j int) bool { return slice[i] < slice[j] })
+		if length == 0 {
+			median = 0
+		} else if length%2 == 0 {
+			median = (slice[length/2-1] + slice[length/2]) / 2
+		} else {
+			median = slice[length/2]
+		}
+		return total, average, min, max, median
+	}
+
+	totalFee, avgFee, minFee, maxFee, medianFee := stats(fees)
+	totalSize, avgSize, minSize, maxSize, medianSize := stats(sizes)
+	_, avgFeeRate, minFeeRate, maxFeeRate, _ := stats(feeRates)
+
+	tests := []struct {
+		name            string
+		txs             []*lbcutil.Tx
+		stats           []string
+		expectedResults map[string]interface{}
+	}{
+		{
+			name:  "empty block",
+			txs:   []*lbcutil.Tx{},
+			stats: []string{},
+			expectedResults: map[string]interface{}{
+				"avgfee":              int64(0),
+				"avgfeerate":          int64(0),
+				"avgtxsize":           int64(0),
+				"feerate_percentiles": []int64{0, 0, 0, 0, 0},
+				"ins":                 int64(0),
+				"maxfee":              int64(0),
+				"maxfeerate":          int64(0),
+				"maxtxsize":           int64(0),
+				"medianfee":           int64(0),
+				"mediantxsize":        int64(0),
+				"minfee":              int64(0),
+				"mintxsize":           int64(0),
+				"outs":                int64(1),
+				"swtotal_size":        int64(0),
+				"swtotal_weight":      int64(0),
+				"swtxs":               int64(0),
+				"total_out":           int64(0),
+				"total_size":          int64(0),
+				"total_weight":        int64(0),
+				"txs":                 int64(1),
+				"utxo_increase":       int64(1),
+			},
+		},
+		{
+			name: "block with 10 transactions + coinbase",
+			txs:  txs,
+			stats: []string{"avgfee", "avgfeerate", "avgtxsize", "feerate_percentiles",
+				"ins", "maxfee", "maxfeerate", "maxtxsize", "medianfee", "mediantxsize",
+				"minfee", "minfeerate", "mintxsize", "outs", "subsidy", "swtxs",
+				"total_size", "total_weight", "totalfee", "txs", "utxo_increase"},
+			expectedResults: map[string]interface{}{
+				"avgfee":     avgFee,
+				"avgfeerate": avgFeeRate,
+				"avgtxsize":  avgSize,
+				"feerate_percentiles": []int64{feeRates[0], feeRates[2],
+					feeRates[4], feeRates[7], feeRates[8]},
+				"ins":            int64(txQuantity),
+				"maxfee":         maxFee,
+				"maxfeerate":     maxFeeRate,
+				"maxtxsize":      maxSize,
+				"medianfee":      medianFee,
+				"mediantxsize":   medianSize,
+				"minfee":         minFee,
+				"minfeerate":     minFeeRate,
+				"mintxsize":      minSize,
+				"outs":           int64(outputCount + 1), // Coinbase output also counts.
+				"subsidy":        int64(100000000),
+				"swtotal_weight": nil, // This stat was not selected, so it should be nil.
+				"swtxs":          int64(0),
+				"total_size":     totalSize,
+				"total_weight":   totalSize * 4,
+				"totalfee":       totalFee,
+				"txs":            int64(txQuantity + 1), // Coinbase transaction also counts.
+				"utxo_increase":  int64(outputCount + 1 - txQuantity),
+				"utxo_size_inc":  nil,
+			},
+		},
+	}
+	for _, test := range tests {
+		// Submit a new block with the provided transactions.
+		block, err := r.GenerateAndSubmitBlock(test.txs, -1, time.Time{})
+		if err != nil {
+			t.Fatalf("Unable to generate block: %v from test %s", err, test.name)
+		}
+
+		blockStats, err := r.GetBlockStats(block.Hash(), &test.stats)
+		if err != nil {
+			t.Fatalf("Call to `getblockstats` on test %s failed: %v", test.name, err)
+		}
+
+		if blockStats.Height != (*int64)(nil) && *blockStats.Height != int64(block.Height()) {
+			t.Fatalf("Unexpected result in test %s, stat: %v, expected: %v, got: %v", test.name, "height", block.Height(), *blockStats.Height)
+		}
+
+		for stat, value := range test.expectedResults {
+			var result interface{}
+			switch stat {
+			case "avgfee":
+				result = blockStats.AverageFee
+			case "avgfeerate":
+				result = blockStats.AverageFeeRate
+			case "avgtxsize":
+				result = blockStats.AverageTxSize
+			case "feerate_percentiles":
+				result = blockStats.FeeratePercentiles
+			case "blockhash":
+				result = blockStats.Hash
+			case "height":
+				result = blockStats.Height
+			case "ins":
+				result = blockStats.Ins
+			case "maxfee":
+				result = blockStats.MaxFee
+			case "maxfeerate":
+				result = blockStats.MaxFeeRate
+			case "maxtxsize":
+				result = blockStats.MaxTxSize
+			case "medianfee":
+				result = blockStats.MedianFee
+			case "mediantime":
+				result = blockStats.MedianTime
+			case "mediantxsize":
+				result = blockStats.MedianTxSize
+			case "minfee":
+				result = blockStats.MinFee
+			case "minfeerate":
+				result = blockStats.MinFeeRate
+			case "mintxsize":
+				result = blockStats.MinTxSize
+			case "outs":
+				result = blockStats.Outs
+			case "swtotal_size":
+				result = blockStats.SegWitTotalSize
+			case "swtotal_weight":
+				result = blockStats.SegWitTotalWeight
+			case "swtxs":
+				result = blockStats.SegWitTxs
+			case "subsidy":
+				result = blockStats.Subsidy
+			case "time":
+				result = blockStats.Time
+			case "total_out":
+				result = blockStats.TotalOut
+			case "total_size":
+				result = blockStats.TotalSize
+			case "total_weight":
+				result = blockStats.TotalWeight
+			case "totalfee":
+				result = blockStats.TotalFee
+			case "txs":
+				result = blockStats.Txs
+			case "utxo_increase":
+				result = blockStats.UTXOIncrease
+			case "utxo_size_inc":
+				result = blockStats.UTXOSizeIncrease
+			}
+
+			var equality bool
+
+			// Check for nil equality.
+			if value == nil && result == (*int64)(nil) {
+				equality = true
+				break
+			} else if result == nil || value == nil {
+				equality = false
+			}
+
+			var resultValue interface{}
+			switch v := value.(type) {
+			case int64:
+				resultValue = *result.(*int64)
+				equality = v == resultValue
+			case string:
+				resultValue = *result.(*string)
+				equality = v == resultValue
+			case []int64:
+				resultValue = *result.(*[]int64)
+				resultSlice := resultValue.([]int64)
+				equality = true
+				for i, item := range resultSlice {
+					if item != v[i] {
+						equality = false
+						break
+					}
+				}
+			}
+			if !equality {
+				if result != nil {
+					t.Fatalf("Unexpected result in test %s, stat: %v, expected: %v, got: %v", test.name, stat, value, resultValue)
+				} else {
+					t.Fatalf("Unexpected result in test %s, stat: %v, expected: %v, got: %v", test.name, stat, value, "<nil>")
+				}
+			}
+
+		}
+	}
 }
 
 var rpcTestCases = []rpctest.HarnessTestCase{
 	testGetBestBlock,
 	testGetBlockCount,
 	testGetBlockHash,
+	testGetBlockStats,
 	testBulkClient,
 }
 
@@ -151,7 +421,8 @@ func TestMain(m *testing.M) {
 	// In order to properly test scenarios on as if we were on mainnet,
 	// ensure that non-standard transactions aren't accepted into the
 	// mempool or relayed.
-	btcdCfg := []string{"--rejectnonstd"}
+	// Enable transaction index to be able to fully test GetBlockStats
+	btcdCfg := []string{"--rejectnonstd", "--txindex"}
 	primaryHarness, err = rpctest.New(
 		&chaincfg.SimNetParams, nil, btcdCfg, "",
 	)

integration/rpctest/rpc_harness.go

@@ -16,6 +16,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/lbryio/lbcd/btcjson"
 	"github.com/lbryio/lbcd/chaincfg"
 	"github.com/lbryio/lbcd/chaincfg/chainhash"
 	"github.com/lbryio/lbcd/rpcclient"
@@ -512,6 +513,18 @@ func (h *Harness) GenerateAndSubmitBlockWithCustomCoinbaseOutputs(
 	return newBlock, nil
 }
 
+// GetBlockStats returns block statistics. First argument specifies height or
+// hash of the target block. Second argument allows to select certain stats to
+// return. If second argument is empty, all stats are returned.
+func (h *Harness) GetBlockStats(hashOrHeight interface{}, stats *[]string) (
+	*btcjson.GetBlockStatsResult, error) {
+
+	h.Lock()
+	defer h.Unlock()
+
+	return h.Client.GetBlockStats(hashOrHeight, stats)
+}
+
 // generateListeningAddresses returns two strings representing listening
 // addresses designated for the current rpc test. If there haven't been any
 // test instances created, the default ports are used. Otherwise, in order to

rpcclient/examples/lbcdblocknotify/README.md

@@ -1,15 +1,21 @@
-# lbcd Websockets Example
+# lbcdbloknotify
 
-This example shows how to use the rpcclient package to connect to a btcd RPC
-server using TLS-secured websockets, register for block connected and block
-disconnected notifications, and get the current block count.
+This bridge program subscribes to lbcd's notifications over websockets using the rpcclient package.
+Users can specify supported actions upon receiving this notifications.
 
-## Running the Example
+## Building(or Running) the Program
 
-The first step is to clone the lbcd package:
+Clone the lbcd package:
 
 ```bash
 $ git clone github.com/lbryio/lbcd
+$ cd lbcd/rpcclient/examples
+
+# build the program
+$ go build .
+
+# or directly run it (build implicitly behind the scene)
+$ go run .
 ```
 
 Display available options:
@@ -29,18 +35,31 @@ $ go run . -h
         Stratum server (default "lbrypool.net:3334")
   -stratumpass string
         Stratum server password (default "password")
+  -quiet
+        Do not print periodic logs
 ```
 
-Start the program:
+Running the program:
 
 ```bash
-$ go run . -stratumpass <STRATUM PASSWD> -rpcuser <RPC USERNAME> -rpcpass <RPC PASSWD>
+# Send stratum mining.update_block mesage upon receving block connected notifiations.
+$ go run . -rpcuser <RPC USERNAME> -rpcpass <RPC PASSWD> --notls -stratum <STRATUM SERVER> -stratumpass <STRATUM PASSWD>
 
-2022/01/10 23:16:21 NotifyBlocks: Registration Complete
-2022/01/10 23:16:21 Block count: 1093112
+2022/01/10 23:16:21 Current block count: 1093112
 ...
+
+# Execute a custome command (with blockhash) upon receving block connected notifiations.
+$ go run . -rpcuser <RPC USERNAME> -rpcpass <RPC PASSWD> --notls -run "echo %s"
 ```
 
+## Notes
+
+* Stratum TCP connection is persisted with auto-reconnect. (retry backoff increases from 1s to 60s maximum)
+
+* Stratum update_block jobs on previous notifications are canceled when a new notification arrives.
+  Usually, the jobs are so short and completed immediately.  However, if the Stratum connection is broken, this
+  prevents the bridge from accumulating stale jobs.
+
 ## License
 
 This example is licensed under the [copyfree](http://copyfree.org) ISC License.

rpcclient/examples/lbcdblocknotify/adapter.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"github.com/lbryio/lbcd/wire"
+	"github.com/lbryio/lbcutil"
+)
+
+type eventBlockConected struct {
+	height int32
+	header *wire.BlockHeader
+	txns   []*lbcutil.Tx
+}
+
+type adapter struct {
+	*bridge
+}
+
+func (a *adapter) onFilteredBlockConnected(height int32, header *wire.BlockHeader, txns []*lbcutil.Tx) {
+	a.eventCh <- &eventBlockConected{height, header, txns}
+}

rpcclient/examples/lbcdblocknotify/bridge.go

@@ -0,0 +1,172 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log"
+	"net"
+	"os"
+	"os/exec"
+	"strings"
+	"sync"
+	"syscall"
+	"time"
+)
+
+type bridge struct {
+	ctx context.Context
+
+	prevJobContext context.Context
+	prevJobCancel  context.CancelFunc
+
+	eventCh chan interface{}
+	errorc  chan error
+	wg      sync.WaitGroup
+
+	stratum *stratumClient
+
+	customCmd string
+}
+
+func newBridge(stratumServer, stratumPass, coinid string) *bridge {
+
+	s := &bridge{
+		ctx:     context.Background(),
+		eventCh: make(chan interface{}),
+		errorc:  make(chan error),
+	}
+
+	if len(stratumServer) > 0 {
+		s.stratum = newStratumClient(stratumServer, stratumPass, coinid)
+	}
+
+	return s
+}
+
+func (b *bridge) start() {
+
+	if b.stratum != nil {
+		backoff := time.Second
+		for {
+			err := b.stratum.dial()
+			if err == nil {
+				break
+			}
+			log.Printf("WARN: stratum.dial() error: %s, retry in %s", err, backoff)
+			time.Sleep(backoff)
+			if backoff < 60*time.Second {
+				backoff += time.Second
+			}
+		}
+	}
+
+	for e := range b.eventCh {
+		switch e := e.(type) {
+		case *eventBlockConected:
+			b.handleFilteredBlockConnected(e)
+		default:
+			b.errorc <- fmt.Errorf("unknown event type: %T", e)
+			return
+		}
+	}
+}
+
+func (b *bridge) handleFilteredBlockConnected(e *eventBlockConected) {
+
+	if !*quiet {
+		log.Printf("Block connected: %s (%d) %v", e.header.BlockHash(), e.height, e.header.Timestamp)
+	}
+
+	hash := e.header.BlockHash().String()
+	height := e.height
+
+	// Cancel jobs on previous block. It's safe if they are already done.
+	if b.prevJobContext != nil {
+		select {
+		case <-b.prevJobContext.Done():
+			log.Printf("prev one canceled")
+		default:
+			b.prevJobCancel()
+		}
+	}
+
+	// Wait until all previous jobs are done or canceled.
+	b.wg.Wait()
+
+	// Create and save cancelable subcontext for new jobs.
+	ctx, cancel := context.WithCancel(b.ctx)
+	b.prevJobContext, b.prevJobCancel = ctx, cancel
+
+	if len(b.customCmd) > 0 {
+		go b.execCustomCommand(ctx, hash, height)
+	}
+
+	// Send stratum update block message
+	if b.stratum != nil {
+		go b.stratumUpdateBlock(ctx, hash, height)
+	}
+}
+
+func (s *bridge) stratumUpdateBlock(ctx context.Context, hash string, height int32) {
+	s.wg.Add(1)
+	defer s.wg.Done()
+
+	backoff := time.Second
+	retry := func(err error) {
+		if backoff < 60*time.Second {
+			backoff += time.Second
+		}
+		log.Printf("WARN: stratum.send() on block %d error: %s", height, err)
+		time.Sleep(backoff)
+		s.stratum.dial()
+	}
+
+	msg := stratumUpdateBlockMsg(*stratumPass, *coinid, hash)
+
+	for {
+		switch err := s.stratum.send(ctx, msg); {
+		case err == nil:
+			return
+		case errors.Is(err, context.Canceled):
+			log.Printf("INFO: stratum.send() on block %d: %s.", height, err)
+			return
+		case errors.Is(err, syscall.EPIPE):
+			errClose := s.stratum.conn.Close()
+			if errClose != nil {
+				log.Printf("WARN: stratum.conn.Close() on block %d: %s.", height, errClose)
+			}
+			retry(err)
+		case errors.Is(err, net.ErrClosed):
+			retry(err)
+		default:
+			retry(err)
+		}
+	}
+
+}
+
+func (s *bridge) execCustomCommand(ctx context.Context, hash string, height int32) {
+	s.wg.Add(1)
+	defer s.wg.Done()
+
+	cmd := strings.ReplaceAll(s.customCmd, "%s", hash)
+	err := doExecCustomCommand(ctx, cmd)
+	if err != nil {
+		log.Printf("ERROR: execCustomCommand on block %s(%d): %s", hash, height, err)
+	}
+}
+
+func doExecCustomCommand(ctx context.Context, cmd string) error {
+	strs := strings.Split(cmd, " ")
+	path, err := exec.LookPath(strs[0])
+	if errors.Is(err, exec.ErrDot) {
+		err = nil
+	}
+	if err != nil {
+		return err
+	}
+	c := exec.CommandContext(ctx, path, strs[1:]...)
+	c.Stdout = os.Stdout
+	return c.Run()
+}

rpcclient/examples/lbcdblocknotify/lbcdclient.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"io/ioutil"
+	"log"
+	"path/filepath"
+
+	"github.com/lbryio/lbcd/rpcclient"
+)
+
+func newLbcdClient(server, user, pass string, notls bool, adpt adapter) *rpcclient.Client {
+
+	ntfnHandlers := rpcclient.NotificationHandlers{
+		OnFilteredBlockConnected: adpt.onFilteredBlockConnected,
+	}
+
+	// Config lbcd RPC client with websockets.
+	connCfg := &rpcclient.ConnConfig{
+		Host:       server,
+		Endpoint:   "ws",
+		User:       user,
+		Pass:       pass,
+		DisableTLS: true,
+	}
+
+	if !notls {
+		cert, err := ioutil.ReadFile(filepath.Join(lbcdHomeDir, "rpc.cert"))
+		if err != nil {
+			log.Fatalf("can't read lbcd certificate: %s", err)
+		}
+		connCfg.Certificates = cert
+		connCfg.DisableTLS = false
+	}
+
+	client, err := rpcclient.New(connCfg, &ntfnHandlers)
+	if err != nil {
+		log.Fatalf("can't create rpc client: %s", err)
+	}
+
+	// Register for block connect and disconnect notifications.
+	if err = client.NotifyBlocks(); err != nil {
+		log.Fatalf("can't register block notification: %s", err)
+	}
+
+	// Get the current block count.
+	blockCount, err := client.GetBlockCount()
+	if err != nil {
+		log.Fatalf("can't get block count: %s", err)
+	}
+	log.Printf("Current block count: %d", blockCount)
+
+	return client
+}

rpcclient/examples/lbcdblocknotify/main.go

@@ -1,133 +1,63 @@
-// Copyright (c) 2014-2017 The btcsuite developers
-// Use of this source code is governed by an ISC
-// license that can be found in the LICENSE file.
-
 package main
 
 import (
-	"errors"
 	"flag"
-	"fmt"
-	"io/ioutil"
 	"log"
-	"net"
-	"os"
 	"os/exec"
 	"path/filepath"
 	"strings"
 
-	"github.com/lbryio/lbcd/rpcclient"
-	"github.com/lbryio/lbcd/wire"
 	"github.com/lbryio/lbcutil"
 )
 
 var (
-	coinid      = flag.String("coinid", "1425", "Coin ID")
-	stratum     = flag.String("stratum", "", "Stratum server")
-	stratumPass = flag.String("stratumpass", "", "Stratum server password")
-	rpcserver   = flag.String("rpcserver", "localhost:9245", "LBCD RPC server")
-	rpcuser     = flag.String("rpcuser", "rpcuser", "LBCD RPC username")
-	rpcpass     = flag.String("rpcpass", "rpcpass", "LBCD RPC password")
-	notls       = flag.Bool("notls", false, "Connect to LBCD with TLS disabled")
-	run         = flag.String("run", "", "Run custom shell command")
+	lbcdHomeDir = lbcutil.AppDataDir("lbcd", false)
+	defaultCert = filepath.Join(lbcdHomeDir, "rpc.cert")
+)
+var (
+	coinid        = flag.String("coinid", "1425", "Coin ID")
+	stratumServer = flag.String("stratum", "", "Stratum server")
+	stratumPass   = flag.String("stratumpass", "", "Stratum server password")
+	rpcserver     = flag.String("rpcserver", "localhost:9245", "LBCD RPC server")
+	rpcuser       = flag.String("rpcuser", "rpcuser", "LBCD RPC username")
+	rpcpass       = flag.String("rpcpass", "rpcpass", "LBCD RPC password")
+	rpccert       = flag.String("rpccert", defaultCert, "LBCD RPC certificate")
+	notls         = flag.Bool("notls", false, "Connect to LBCD with TLS disabled")
+	run           = flag.String("run", "", "Run custom shell command")
+	quiet         = flag.Bool("quiet", false, "Do not print logs")
 )
 
-func onFilteredBlockConnected(height int32, header *wire.BlockHeader, txns []*lbcutil.Tx) {
-
-	blockHash := header.BlockHash().String()
-
-	log.Printf("Block connected: %v (%d) %v", blockHash, height, header.Timestamp)
-
-	if cmd := *run; len(cmd) != 0 {
-		cmd = strings.ReplaceAll(cmd, "%s", blockHash)
-		err := execCustomCommand(cmd)
-		if err != nil {
-			log.Printf("ERROR: execCustomCommand: %s", err)
-		}
-	}
-
-	if len(*stratum) > 0 && len(*stratumPass) > 0 {
-		err := stratumUpdateBlock(*stratum, *stratumPass, *coinid, blockHash)
-		if err != nil {
-			log.Printf("ERROR: stratumUpdateBlock: %s", err)
-		}
-	}
-}
-func execCustomCommand(cmd string) error {
-	strs := strings.Split(cmd, " ")
-	path, err := exec.LookPath(strs[0])
-	if errors.Is(err, exec.ErrDot) {
-		err = nil
-	}
-	if err != nil {
-		return err
-	}
-	c := exec.Command(path, strs[1:]...)
-	c.Stdout = os.Stdout
-	return c.Run()
-}
-
-func stratumUpdateBlock(stratum, stratumPass, coinid, blockHash string) error {
-	addr, err := net.ResolveTCPAddr("tcp", stratum)
-	if err != nil {
-		return fmt.Errorf("can't resolve addr: %w", err)
-	}
-
-	conn, err := net.DialTCP("tcp", nil, addr)
-	if err != nil {
-		return fmt.Errorf("can't dial tcp: %w", err)
-	}
-	defer conn.Close()
-
-	msg := fmt.Sprintf(`{"id":1,"method":"mining.update_block","params":[%q,%s,%q]}`,
-		stratumPass, coinid, blockHash)
-
-	_, err = conn.Write([]byte(msg))
-	if err != nil {
-		return fmt.Errorf("can't write message: %w", err)
-	}
-
-	return nil
-}
 func main() {
 
 	flag.Parse()
 
-	ntfnHandlers := rpcclient.NotificationHandlers{
-		OnFilteredBlockConnected: onFilteredBlockConnected,
+	// Setup notification handler
+	b := newBridge(*stratumServer, *stratumPass, *coinid)
+
+	if len(*run) > 0 {
+		// Check if ccommand exists.
+		strs := strings.Split(*run, " ")
+		cmd := strs[0]
+		_, err := exec.LookPath(cmd)
+		if err != nil {
+			log.Fatalf("ERROR: %s not found: %s", cmd, err)
+		}
+		b.customCmd = *run
 	}
 
-	// Connect to local lbcd RPC server using websockets.
-	lbcdHomeDir := lbcutil.AppDataDir("lbcd", false)
-	certs, err := ioutil.ReadFile(filepath.Join(lbcdHomeDir, "rpc.cert"))
-	if err != nil {
-		log.Fatalf("can't read lbcd certificate: %s", err)
-	}
-	connCfg := &rpcclient.ConnConfig{
-		Host:         *rpcserver,
-		Endpoint:     "ws",
-		User:         *rpcuser,
-		Pass:         *rpcpass,
-		Certificates: certs,
-		DisableTLS:   *notls,
-	}
-	client, err := rpcclient.New(connCfg, &ntfnHandlers)
-	if err != nil {
-		log.Fatalf("can't create rpc client: %s", err)
-	}
+	// Start the eventt handler.
+	go b.start()
 
-	// Register for block connect and disconnect notifications.
-	if err = client.NotifyBlocks(); err != nil {
-		log.Fatalf("can't register block notification: %s", err)
-	}
-	log.Printf("NotifyBlocks: Registration Complete")
+	// Adaptater receives lbcd notifications, and emit events.
+	adpt := adapter{b}
 
-	// Get the current block count.
-	blockCount, err := client.GetBlockCount()
-	if err != nil {
-		log.Fatalf("can't get block count: %s", err)
-	}
-	log.Printf("Block count: %d", blockCount)
+	client := newLbcdClient(*rpcserver, *rpcuser, *rpcpass, *notls, adpt)
+
+	go func() {
+		err := <-b.errorc
+		log.Fatalf("ERROR: %s", err)
+		client.Shutdown()
+	}()
 
 	// Wait until the client either shuts down gracefully (or the user
 	// terminates the process with Ctrl+C).

rpcclient/examples/lbcdblocknotify/stratumclient.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"net"
+)
+
+type stratumClient struct {
+	server string
+	passwd string
+	coinid string
+	conn   *net.TCPConn
+}
+
+func newStratumClient(server, passwd, coinid string) *stratumClient {
+
+	return &stratumClient{
+		server: server,
+	}
+}
+
+func (c *stratumClient) dial() error {
+
+	addr, err := net.ResolveTCPAddr("tcp", c.server)
+	if err != nil {
+		return fmt.Errorf("resolve tcp addr: %w", err)
+	}
+
+	conn, err := net.DialTCP("tcp", nil, addr)
+	if err != nil {
+		return fmt.Errorf("dial tcp: %w", err)
+	}
+	c.conn = conn
+
+	return nil
+}
+
+func (c *stratumClient) send(ctx context.Context, msg string) error {
+
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+
+	_, err := c.conn.Write([]byte(msg))
+
+	return err
+}
+
+func stratumUpdateBlockMsg(stratumPass, coinid, blockHash string) string {
+
+	return fmt.Sprintf(`{"id":1,"method":"mining.update_block","params":[%q,%s,%q]}`,
+		stratumPass, coinid, blockHash)
+}

rpcclient/infrastructure.go

@@ -774,7 +774,8 @@ func (c *Client) handleSendPostMessage(jReq *jsonRequest) {
 	tries := 10
 	for i := 0; tries == 0 || i < tries; i++ {
 		bodyReader := bytes.NewReader(jReq.marshalledJSON)
-		httpReq, err := http.NewRequest("POST", url, bodyReader)
+		var httpReq *http.Request
+		httpReq, err = http.NewRequest("POST", url, bodyReader)
 		if err != nil {
 			jReq.responseChan <- &Response{result: nil, err: err}
 			return
@@ -786,7 +787,8 @@ func (c *Client) handleSendPostMessage(jReq *jsonRequest) {
 		}
 
 		// Configure basic access authorization.
-		user, pass, err := c.config.getAuth()
+		var user, pass string
+		user, pass, err = c.config.getAuth()
 		if err != nil {
 			jReq.responseChan <- &Response{result: nil, err: err}
 			return

rpcclient/rawtransactions.go

@@ -291,13 +291,18 @@ func (r FutureCreateRawTransactionResult) Receive() (*wire.MsgTx, error) {
 //
 // See CreateRawTransaction for the blocking version and more details.
 func (c *Client) CreateRawTransactionAsync(inputs []btcjson.TransactionInput,
-	amounts map[btcutil.Address]btcutil.Amount, lockTime *int64) FutureCreateRawTransactionResult {
+	outputs map[btcutil.Address]interface{}, lockTime *int64) FutureCreateRawTransactionResult {
 
-	convertedAmts := make(map[string]float64, len(amounts))
-	for addr, amount := range amounts {
-		convertedAmts[addr.String()] = amount.ToBTC()
+	convertedData := make(map[string]interface{}, len(outputs))
+	for key, value := range outputs {
+		switch val := value.(type) {
+		case btcutil.Amount:
+			convertedData[key.String()] = val.ToBTC()
+		case string:
+			convertedData[key.String()] = val
+		}
 	}
-	cmd := btcjson.NewCreateRawTransactionCmd(inputs, convertedAmts, lockTime)
+	cmd := btcjson.NewCreateRawTransactionCmd(inputs, convertedData, lockTime)
 	return c.SendCmd(cmd)
 }
 
@@ -305,9 +310,9 @@ func (c *Client) CreateRawTransactionAsync(inputs []btcjson.TransactionInput,
 // and sending to the provided addresses. If the inputs are either nil or an
 // empty slice, it is interpreted as an empty slice.
 func (c *Client) CreateRawTransaction(inputs []btcjson.TransactionInput,
-	amounts map[btcutil.Address]btcutil.Amount, lockTime *int64) (*wire.MsgTx, error) {
+	outputs map[btcutil.Address]interface{}, lockTime *int64) (*wire.MsgTx, error) {
 
-	return c.CreateRawTransactionAsync(inputs, amounts, lockTime).Receive()
+	return c.CreateRawTransactionAsync(inputs, outputs, lockTime).Receive()
 }
 
 // FutureSendRawTransactionResult is a future promise to deliver the result

rpcclient/wallet.go

@@ -536,9 +536,10 @@ func (r FutureSendToAddressResult) Receive() (*chainhash.Hash, error) {
 // returned instance.
 //
 // See SendToAddress for the blocking version and more details.
-func (c *Client) SendToAddressAsync(address btcutil.Address, amount btcutil.Amount) FutureSendToAddressResult {
+func (c *Client) SendToAddressAsync(address btcutil.Address, amount btcutil.Amount,
+	addrType *string) FutureSendToAddressResult {
 	addr := address.EncodeAddress()
-	cmd := btcjson.NewSendToAddressCmd(addr, amount.ToBTC(), nil, nil)
+	cmd := btcjson.NewSendToAddressCmd(addr, amount.ToBTC(), addrType, nil, nil)
 	return c.SendCmd(cmd)
 }
 
@@ -550,8 +551,9 @@ func (c *Client) SendToAddressAsync(address btcutil.Address, amount btcutil.Amou
 //
 // NOTE: This function requires to the wallet to be unlocked.  See the
 // WalletPassphrase function for more details.
-func (c *Client) SendToAddress(address btcutil.Address, amount btcutil.Amount) (*chainhash.Hash, error) {
-	return c.SendToAddressAsync(address, amount).Receive()
+func (c *Client) SendToAddress(address btcutil.Address, amount btcutil.Amount,
+	addrType *string) (*chainhash.Hash, error) {
+	return c.SendToAddressAsync(address, amount, addrType).Receive()
 }
 
 // SendToAddressCommentAsync returns an instance of a type that can be used to
@@ -560,12 +562,12 @@ func (c *Client) SendToAddress(address btcutil.Address, amount btcutil.Amount) (
 //
 // See SendToAddressComment for the blocking version and more details.
 func (c *Client) SendToAddressCommentAsync(address btcutil.Address,
-	amount btcutil.Amount, comment,
+	amount btcutil.Amount, addrType *string, comment string,
 	commentTo string) FutureSendToAddressResult {
 
 	addr := address.EncodeAddress()
-	cmd := btcjson.NewSendToAddressCmd(addr, amount.ToBTC(), &comment,
-		&commentTo)
+	cmd := btcjson.NewSendToAddressCmd(addr, amount.ToBTC(), addrType,
+		&comment, &commentTo)
 	return c.SendCmd(cmd)
 }
 
@@ -581,9 +583,10 @@ func (c *Client) SendToAddressCommentAsync(address btcutil.Address,
 //
 // NOTE: This function requires to the wallet to be unlocked.  See the
 // WalletPassphrase function for more details.
-func (c *Client) SendToAddressComment(address btcutil.Address, amount btcutil.Amount, comment, commentTo string) (*chainhash.Hash, error) {
-	return c.SendToAddressCommentAsync(address, amount, comment,
-		commentTo).Receive()
+func (c *Client) SendToAddressComment(address btcutil.Address, amount btcutil.Amount,
+	addrType *string, comment, commentTo string) (*chainhash.Hash, error) {
+	return c.SendToAddressCommentAsync(address, amount, addrType,
+		comment, commentTo).Receive()
 }
 
 // FutureSendFromResult is a future promise to deliver the result of a
@@ -615,10 +618,11 @@ func (r FutureSendFromResult) Receive() (*chainhash.Hash, error) {
 // returned instance.
 //
 // See SendFrom for the blocking version and more details.
-func (c *Client) SendFromAsync(fromAccount string, toAddress btcutil.Address, amount btcutil.Amount) FutureSendFromResult {
+func (c *Client) SendFromAsync(fromAccount string, toAddress btcutil.Address,
+	amount btcutil.Amount, addrType *string) FutureSendFromResult {
 	addr := toAddress.EncodeAddress()
 	cmd := btcjson.NewSendFromCmd(fromAccount, addr, amount.ToBTC(), nil,
-		nil, nil)
+		addrType, nil, nil)
 	return c.SendCmd(cmd)
 }
 
@@ -630,8 +634,8 @@ func (c *Client) SendFromAsync(fromAccount string, toAddress btcutil.Address, am
 //
 // NOTE: This function requires to the wallet to be unlocked.  See the
 // WalletPassphrase function for more details.
-func (c *Client) SendFrom(fromAccount string, toAddress btcutil.Address, amount btcutil.Amount) (*chainhash.Hash, error) {
-	return c.SendFromAsync(fromAccount, toAddress, amount).Receive()
+func (c *Client) SendFrom(fromAccount string, toAddress btcutil.Address, amount btcutil.Amount, addrType *string) (*chainhash.Hash, error) {
+	return c.SendFromAsync(fromAccount, toAddress, amount, addrType).Receive()
 }
 
 // SendFromMinConfAsync returns an instance of a type that can be used to get
@@ -639,10 +643,12 @@ func (c *Client) SendFrom(fromAccount string, toAddress btcutil.Address, amount
 // the returned instance.
 //
 // See SendFromMinConf for the blocking version and more details.
-func (c *Client) SendFromMinConfAsync(fromAccount string, toAddress btcutil.Address, amount btcutil.Amount, minConfirms int) FutureSendFromResult {
+func (c *Client) SendFromMinConfAsync(fromAccount string,
+	toAddress btcutil.Address, amount btcutil.Amount,
+	minConfirms int, addrType *string) FutureSendFromResult {
 	addr := toAddress.EncodeAddress()
 	cmd := btcjson.NewSendFromCmd(fromAccount, addr, amount.ToBTC(),
-		&minConfirms, nil, nil)
+		&minConfirms, addrType, nil, nil)
 	return c.SendCmd(cmd)
 }
 
@@ -655,9 +661,10 @@ func (c *Client) SendFromMinConfAsync(fromAccount string, toAddress btcutil.Addr
 //
 // NOTE: This function requires to the wallet to be unlocked.  See the
 // WalletPassphrase function for more details.
-func (c *Client) SendFromMinConf(fromAccount string, toAddress btcutil.Address, amount btcutil.Amount, minConfirms int) (*chainhash.Hash, error) {
+func (c *Client) SendFromMinConf(fromAccount string, toAddress btcutil.Address,
+	amount btcutil.Amount, minConfirms int, addrType *string) (*chainhash.Hash, error) {
 	return c.SendFromMinConfAsync(fromAccount, toAddress, amount,
-		minConfirms).Receive()
+		minConfirms, addrType).Receive()
 }
 
 // SendFromCommentAsync returns an instance of a type that can be used to get
@@ -667,11 +674,11 @@ func (c *Client) SendFromMinConf(fromAccount string, toAddress btcutil.Address,
 // See SendFromComment for the blocking version and more details.
 func (c *Client) SendFromCommentAsync(fromAccount string,
 	toAddress btcutil.Address, amount btcutil.Amount, minConfirms int,
-	comment, commentTo string) FutureSendFromResult {
+	addrType *string, comment, commentTo string) FutureSendFromResult {
 
 	addr := toAddress.EncodeAddress()
 	cmd := btcjson.NewSendFromCmd(fromAccount, addr, amount.ToBTC(),
-		&minConfirms, &comment, &commentTo)
+		&minConfirms, addrType, &comment, &commentTo)
 	return c.SendCmd(cmd)
 }
 
@@ -687,11 +694,11 @@ func (c *Client) SendFromCommentAsync(fromAccount string,
 // NOTE: This function requires to the wallet to be unlocked.  See the
 // WalletPassphrase function for more details.
 func (c *Client) SendFromComment(fromAccount string, toAddress btcutil.Address,
-	amount btcutil.Amount, minConfirms int,
+	amount btcutil.Amount, minConfirms int, addrType *string,
 	comment, commentTo string) (*chainhash.Hash, error) {
 
 	return c.SendFromCommentAsync(fromAccount, toAddress, amount,
-		minConfirms, comment, commentTo).Receive()
+		minConfirms, addrType, comment, commentTo).Receive()
 }
 
 // FutureSendManyResult is a future promise to deliver the result of a
@@ -728,7 +735,7 @@ func (c *Client) SendManyAsync(fromAccount string, amounts map[btcutil.Address]b
 	for addr, amount := range amounts {
 		convertedAmounts[addr.EncodeAddress()] = amount.ToBTC()
 	}
-	cmd := btcjson.NewSendManyCmd(fromAccount, convertedAmounts, nil, nil)
+	cmd := btcjson.NewSendManyCmd(fromAccount, convertedAmounts, nil, nil, nil)
 	return c.SendCmd(cmd)
 }
 
@@ -751,14 +758,14 @@ func (c *Client) SendMany(fromAccount string, amounts map[btcutil.Address]btcuti
 // See SendManyMinConf for the blocking version and more details.
 func (c *Client) SendManyMinConfAsync(fromAccount string,
 	amounts map[btcutil.Address]btcutil.Amount,
-	minConfirms int) FutureSendManyResult {
+	minConfirms int, addrType *string) FutureSendManyResult {
 
 	convertedAmounts := make(map[string]float64, len(amounts))
 	for addr, amount := range amounts {
 		convertedAmounts[addr.EncodeAddress()] = amount.ToBTC()
 	}
 	cmd := btcjson.NewSendManyCmd(fromAccount, convertedAmounts,
-		&minConfirms, nil)
+		&minConfirms, nil, addrType)
 	return c.SendCmd(cmd)
 }
 
@@ -773,9 +780,10 @@ func (c *Client) SendManyMinConfAsync(fromAccount string,
 // WalletPassphrase function for more details.
 func (c *Client) SendManyMinConf(fromAccount string,
 	amounts map[btcutil.Address]btcutil.Amount,
-	minConfirms int) (*chainhash.Hash, error) {
+	minConfirms int, addrType *string) (*chainhash.Hash, error) {
 
-	return c.SendManyMinConfAsync(fromAccount, amounts, minConfirms).Receive()
+	return c.SendManyMinConfAsync(fromAccount, amounts, minConfirms,
+		addrType).Receive()
 }
 
 // SendManyCommentAsync returns an instance of a type that can be used to get
@@ -785,14 +793,14 @@ func (c *Client) SendManyMinConf(fromAccount string,
 // See SendManyComment for the blocking version and more details.
 func (c *Client) SendManyCommentAsync(fromAccount string,
 	amounts map[btcutil.Address]btcutil.Amount, minConfirms int,
-	comment string) FutureSendManyResult {
+	addrType *string, comment string) FutureSendManyResult {
 
 	convertedAmounts := make(map[string]float64, len(amounts))
 	for addr, amount := range amounts {
 		convertedAmounts[addr.EncodeAddress()] = amount.ToBTC()
 	}
 	cmd := btcjson.NewSendManyCmd(fromAccount, convertedAmounts,
-		&minConfirms, &comment)
+		&minConfirms, &comment, addrType)
 	return c.SendCmd(cmd)
 }
 
@@ -808,10 +816,10 @@ func (c *Client) SendManyCommentAsync(fromAccount string,
 // WalletPassphrase function for more details.
 func (c *Client) SendManyComment(fromAccount string,
 	amounts map[btcutil.Address]btcutil.Amount, minConfirms int,
-	comment string) (*chainhash.Hash, error) {
+	addrType *string, comment string) (*chainhash.Hash, error) {
 
 	return c.SendManyCommentAsync(fromAccount, amounts, minConfirms,
-		comment).Receive()
+		addrType, comment).Receive()
 }
 
 // *************************
@@ -1135,8 +1143,8 @@ func (r FutureGetRawChangeAddressResult) Receive() (btcutil.Address, error) {
 // function on the returned instance.
 //
 // See GetRawChangeAddress for the blocking version and more details.
-func (c *Client) GetRawChangeAddressAsync(account string) FutureGetRawChangeAddressResult {
-	cmd := btcjson.NewGetRawChangeAddressCmd(&account)
+func (c *Client) GetRawChangeAddressAsync(account *string) FutureGetRawChangeAddressResult {
+	cmd := btcjson.NewGetRawChangeAddressCmd(account)
 	result := FutureGetRawChangeAddressResult{
 		network:         c.chainParams,
 		responseChannel: c.SendCmd(cmd),
@@ -1147,7 +1155,7 @@ func (c *Client) GetRawChangeAddressAsync(account string) FutureGetRawChangeAddr
 // GetRawChangeAddress returns a new address for receiving change that will be
 // associated with the provided account.  Note that this is only for raw
 // transactions and NOT for normal use.
-func (c *Client) GetRawChangeAddress(account string) (btcutil.Address, error) {
+func (c *Client) GetRawChangeAddress(account *string) (btcutil.Address, error) {
 	return c.GetRawChangeAddressAsync(account).Receive()
 }
 
@@ -1226,7 +1234,7 @@ func (r FutureGetAccountAddressResult) Receive() (btcutil.Address, error) {
 // the returned instance.
 //
 // See GetAccountAddress for the blocking version and more details.
-func (c *Client) GetAccountAddressAsync(account string) FutureGetAccountAddressResult {
+func (c *Client) GetAccountAddressAsync(account *string) FutureGetAccountAddressResult {
 	cmd := btcjson.NewGetAccountAddressCmd(account)
 	result := FutureGetAccountAddressResult{
 		network:         c.chainParams,
@@ -1237,7 +1245,7 @@ func (c *Client) GetAccountAddressAsync(account string) FutureGetAccountAddressR
 
 // GetAccountAddress returns the current Bitcoin address for receiving payments
 // to the specified account.
-func (c *Client) GetAccountAddress(account string) (btcutil.Address, error) {
+func (c *Client) GetAccountAddress(account *string) (btcutil.Address, error) {
 	return c.GetAccountAddressAsync(account).Receive()
 }
 
@@ -1317,7 +1325,7 @@ func (r FutureGetAddressesByAccountResult) Receive() ([]btcutil.Address, error)
 // function on the returned instance.
 //
 // See GetAddressesByAccount for the blocking version and more details.
-func (c *Client) GetAddressesByAccountAsync(account string) FutureGetAddressesByAccountResult {
+func (c *Client) GetAddressesByAccountAsync(account *string) FutureGetAddressesByAccountResult {
 	cmd := btcjson.NewGetAddressesByAccountCmd(account)
 	result := FutureGetAddressesByAccountResult{
 		network:         c.chainParams,
@@ -1328,7 +1336,7 @@ func (c *Client) GetAddressesByAccountAsync(account string) FutureGetAddressesBy
 
 // GetAddressesByAccount returns the list of addresses associated with the
 // passed account.
-func (c *Client) GetAddressesByAccount(account string) ([]btcutil.Address, error) {
+func (c *Client) GetAddressesByAccount(account *string) ([]btcutil.Address, error) {
 	return c.GetAddressesByAccountAsync(account).Receive()
 }
 
@@ -1709,7 +1717,7 @@ func (r FutureGetReceivedByAccountResult) Receive() (btcutil.Amount, error) {
 // function on the returned instance.
 //
 // See GetReceivedByAccount for the blocking version and more details.
-func (c *Client) GetReceivedByAccountAsync(account string) FutureGetReceivedByAccountResult {
+func (c *Client) GetReceivedByAccountAsync(account *string) FutureGetReceivedByAccountResult {
 	cmd := btcjson.NewGetReceivedByAccountCmd(account, nil)
 	return c.SendCmd(cmd)
 }
@@ -1719,7 +1727,7 @@ func (c *Client) GetReceivedByAccountAsync(account string) FutureGetReceivedByAc
 //
 // See GetReceivedByAccountMinConf to override the minimum number of
 // confirmations.
-func (c *Client) GetReceivedByAccount(account string) (btcutil.Amount, error) {
+func (c *Client) GetReceivedByAccount(account *string) (btcutil.Amount, error) {
 	return c.GetReceivedByAccountAsync(account).Receive()
 }
 
@@ -1728,8 +1736,8 @@ func (c *Client) GetReceivedByAccount(account string) (btcutil.Amount, error) {
 // function on the returned instance.
 //
 // See GetReceivedByAccountMinConf for the blocking version and more details.
-func (c *Client) GetReceivedByAccountMinConfAsync(account string, minConfirms int) FutureGetReceivedByAccountResult {
-	cmd := btcjson.NewGetReceivedByAccountCmd(account, &minConfirms)
+func (c *Client) GetReceivedByAccountMinConfAsync(account *string, minConfirms *int) FutureGetReceivedByAccountResult {
+	cmd := btcjson.NewGetReceivedByAccountCmd(account, minConfirms)
 	return c.SendCmd(cmd)
 }
 
@@ -1738,7 +1746,7 @@ func (c *Client) GetReceivedByAccountMinConfAsync(account string, minConfirms in
 // confirmations.
 //
 // See GetReceivedByAccount to use the default minimum number of confirmations.
-func (c *Client) GetReceivedByAccountMinConf(account string, minConfirms int) (btcutil.Amount, error) {
+func (c *Client) GetReceivedByAccountMinConf(account *string, minConfirms *int) (btcutil.Amount, error) {
 	return c.GetReceivedByAccountMinConfAsync(account, minConfirms).Receive()
 }
 
@@ -2054,14 +2062,14 @@ func (r FutureRescanBlockchainResult) Receive() (*btcjson.RescanBlockchainResult
 // returned instance.
 //
 // See RescanBlockchain for the blocking version and more details.
-func (c *Client) RescanBlockchainAsync(startHeight *int64, stopHeight *int64) FutureRescanBlockchainResult {
+func (c *Client) RescanBlockchainAsync(startHeight *int32, stopHeight *int32) FutureRescanBlockchainResult {
 	cmd := btcjson.NewRescanBlockchainCmd(startHeight, stopHeight)
 	return c.SendCmd(cmd)
 }
 
 // RescanBlockchain rescans the local blockchain for wallet related
 // transactions from the startHeight to the the inclusive stopHeight.
-func (c *Client) RescanBlockchain(startHeight *int64, stopHeight *int64) (*btcjson.RescanBlockchainResult, error) {
+func (c *Client) RescanBlockchain(startHeight *int32, stopHeight *int32) (*btcjson.RescanBlockchainResult, error) {
 	return c.RescanBlockchainAsync(startHeight, stopHeight).Receive()
 }
 

rpcserver.go

@@ -21,6 +21,7 @@ import (
 	"net"
 	"net/http"
 	"os"
+	"sort"
 	"strconv"
 	"strings"
 	"sync"
@@ -151,6 +152,7 @@ var rpcHandlersBeforeInit = map[string]commandHandler{
 	"getblockcount":          handleGetBlockCount,
 	"getblockhash":           handleGetBlockHash,
 	"getblockheader":         handleGetBlockHeader,
+	"getblockstats":          handleGetBlockStats,
 	"getblocktemplate":       handleGetBlockTemplate,
 	"getcfilter":             handleGetCFilter,
 	"getcfilterheader":       handleGetCFilterHeader,
@@ -327,6 +329,15 @@ func rpcDecodeHexError(gotHex string) *btcjson.RPCError {
 			gotHex))
 }
 
+// rpcInvalidAddressOrKey is a convenience function for returning a nicely
+// formatted RPC error which indicates the address or key is invalid.
+func rpcInvalidAddressOrKeyError(addr string, msg string) *btcjson.RPCError {
+	return &btcjson.RPCError{
+		Code:    btcjson.ErrRPCInvalidAddressOrKey,
+		Message: msg,
+	}
+}
+
 // rpcNoTxInfoError is a convenience function for returning a nicely formatted
 // RPC error which indicates there is no information available for the provided
 // transaction hash.
@@ -568,59 +579,92 @@ func handleCreateRawTransaction(s *rpcServer, cmd interface{}, closeChan <-chan
 	// Add all transaction outputs to the transaction after performing
 	// some validity checks.
 	params := s.cfg.ChainParams
-	for encodedAddr, amount := range c.Amounts {
-		// Ensure amount is in the valid range for monetary amounts.
-		if amount <= 0 || amount*btcutil.SatoshiPerBitcoin > btcutil.MaxSatoshi {
+
+	// Ensure amount is in the valid range for monetary amounts.
+	// Decode the provided address.
+	// Ensure the address is one of the supported types and that
+	// the network encoded with the address matches the network the
+	// server is currently on.
+	// Create a new script which pays to the provided address.
+	// Convert the amount to satoshi.
+	handleAmountFn := func(amount float64, encodedAddr string) (*wire.TxOut,
+		error) {
+
+		if amount <= 0 ||
+			amount*btcutil.SatoshiPerBitcoin > btcutil.MaxSatoshi {
 			return nil, &btcjson.RPCError{
 				Code:    btcjson.ErrRPCType,
-				Message: "Invalid amount",
+				Message: "invalid amount",
 			}
 		}
 
-		// Decode the provided address.
 		addr, err := btcutil.DecodeAddress(encodedAddr, params)
 		if err != nil {
-			return nil, &btcjson.RPCError{
-				Code:    btcjson.ErrRPCInvalidAddressOrKey,
-				Message: "Invalid address or key: " + err.Error(),
-			}
+			return nil, rpcInvalidAddressOrKeyError(encodedAddr,
+				"invalid address or key")
 		}
 
-		// Ensure the address is one of the supported types and that
-		// the network encoded with the address matches the network the
-		// server is currently on.
 		switch addr.(type) {
 		case *btcutil.AddressPubKeyHash:
 		case *btcutil.AddressScriptHash:
 		default:
-			return nil, &btcjson.RPCError{
-				Code:    btcjson.ErrRPCInvalidAddressOrKey,
-				Message: "Invalid address or key: " + addr.String(),
-			}
+			return nil, rpcInvalidAddressOrKeyError(addr.String(),
+				"invalid address or key")
 		}
 		if !addr.IsForNet(params) {
-			return nil, &btcjson.RPCError{
-				Code: btcjson.ErrRPCInvalidAddressOrKey,
-				Message: "Invalid address: " + encodedAddr +
-					" is for the wrong network",
-			}
+			return nil, rpcInvalidAddressOrKeyError(addr.String(),
+				"wrong network")
 		}
 
-		// Create a new script which pays to the provided address.
 		pkScript, err := txscript.PayToAddrScript(addr)
 		if err != nil {
-			context := "Failed to generate pay-to-address script"
+			context := "failed to generate pay-to-address script"
 			return nil, internalRPCError(err.Error(), context)
 		}
 
-		// Convert the amount to satoshi.
 		satoshi, err := btcutil.NewAmount(amount)
 		if err != nil {
-			context := "Failed to convert amount"
+			context := "failed to convert amount"
 			return nil, internalRPCError(err.Error(), context)
 		}
 
-		txOut := wire.NewTxOut(int64(satoshi), pkScript)
+		return wire.NewTxOut(int64(satoshi), pkScript), nil
+	}
+
+	handleDataFn := func(key string, value string) (*wire.TxOut, error) {
+		if key != "data" {
+			context := "output key must be an address or \"data\""
+			return nil, &btcjson.RPCError{
+				Code:    btcjson.ErrRPCInvalidParameter,
+				Message: context,
+			}
+		}
+		var data []byte
+		data, err := hex.DecodeString(value)
+		if err != nil {
+			return nil, rpcDecodeHexError(value)
+		}
+		return wire.NewTxOut(0, data), nil
+	}
+
+	for key, value := range c.Outputs {
+		var err error
+		var txOut *wire.TxOut
+		switch value := value.(type) {
+		case float64:
+			txOut, err = handleAmountFn(value, key)
+		case string:
+			txOut, err = handleDataFn(key, value)
+		default:
+			context := "output value must be a string or float"
+			return nil, &btcjson.RPCError{
+				Code:    btcjson.ErrRPCType,
+				Message: context,
+			}
+		}
+		if err != nil {
+			return nil, err
+		}
 		mtx.AddTxOut(txOut)
 	}
 
@@ -1536,6 +1580,405 @@ func handleGetChainTips(s *rpcServer, cmd interface{}, closeChan <-chan struct{}
 	return results, nil
 }
 
+// handleGetBlockStats implements the getblockstats command.
+func handleGetBlockStats(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (interface{}, error) {
+	c := cmd.(*btcjson.GetBlockStatsCmd)
+
+	// Check whether a block height or hash was provided.
+	blockHeight, ok := c.HashOrHeight.Value.(int)
+	var hash *chainhash.Hash
+	var err error
+	if ok {
+		// Block height was provided.
+		hash, err = s.cfg.Chain.BlockHashByHeight(int32(blockHeight))
+		if err != nil {
+			return nil, &btcjson.RPCError{
+				Code:    btcjson.ErrRPCOutOfRange,
+				Message: "Block number out of range",
+			}
+		}
+	} else {
+		// Block hash was provided.
+		hashString := c.HashOrHeight.Value.(string)
+		hash, err = chainhash.NewHashFromStr(hashString)
+		if err != nil {
+			return nil, rpcDecodeHexError(hashString)
+		}
+
+		// Get the block height from chain.
+		blockHeightByHash, err := s.cfg.Chain.BlockHeightByHash(hash)
+		if err != nil {
+			context := "Failed to obtain block height"
+			return nil, internalRPCError(err.Error(), context)
+		}
+		blockHeight = int(blockHeightByHash)
+	}
+
+	// Load block bytes from the database.
+	var blkBytes []byte
+	err = s.cfg.DB.View(func(dbTx database.Tx) error {
+		var err error
+		blkBytes, err = dbTx.FetchBlock(hash)
+		return err
+	})
+	if err != nil {
+		return nil, &btcjson.RPCError{
+			Code:    btcjson.ErrRPCBlockNotFound,
+			Message: "Block not found",
+		}
+	}
+
+	// Deserialize the block.
+	blk, err := btcutil.NewBlockFromBytes(blkBytes)
+	if err != nil {
+		context := "Failed to deserialize block"
+		return nil, internalRPCError(err.Error(), context)
+	}
+
+	var selectedStats []string
+	if c.Stats != nil {
+		selectedStats = *c.Stats
+	}
+
+	// Create a set of selected stats to facilitate queries.
+	statsSet := make(map[string]bool)
+	for _, value := range selectedStats {
+		statsSet[value] = true
+	}
+
+	// Return all stats if an empty array was provided.
+	allStats := len(selectedStats) == 0
+	calcFees := statsSet["avgfee"] || statsSet["avgfeerate"] || statsSet["maxfee"] || statsSet["maxfeerate"] ||
+		statsSet["medianfee"] || statsSet["totalfee"] || statsSet["feerate_percentiles"]
+
+	if calcFees && s.cfg.TxIndex == nil {
+		return nil, &btcjson.RPCError{
+			Code: btcjson.ErrRPCNoTxInfo,
+			Message: "The transaction index must be " +
+				"enabled to obtain fee statistics " +
+				"(specify --txindex)",
+		}
+	}
+
+	txs := blk.Transactions()
+	txCount := len(txs)
+	var inputCount, outputCount int
+	var totalOutputValue int64
+
+	// Create a map of transaction statistics.
+	txStats := make([]map[string]interface{}, txCount)
+	for i, tx := range txs {
+		size := tx.MsgTx().SerializeSize()
+		witnessSize := size - tx.MsgTx().SerializeSizeStripped()
+		weight := int64(tx.MsgTx().SerializeSizeStripped()*4 + witnessSize)
+
+		var fee, feeRate int64
+		if (calcFees || allStats) && s.cfg.TxIndex != nil && !blockchain.IsCoinBaseTx(tx.MsgTx()) {
+			fee, err = calculateFee(tx, s.cfg.TxIndex, s.cfg.DB)
+			if err != nil {
+				context := "Failed to calculate fees"
+				return nil, internalRPCError(err.Error(), context)
+			}
+			if weight != 0 {
+				feeRate = fee * 4 / weight
+			}
+		}
+		segwit := tx.HasWitness()
+		txStats[i] = map[string]interface{}{"tx": tx, "fee": fee, "size": int64(size),
+			"feeRate": feeRate, "weight": weight, "segwit": segwit}
+		inputCount += len(tx.MsgTx().TxIn)
+		outputCount += len(tx.MsgTx().TxOut)
+
+		// Coinbase is excluded from the total output.
+		if !blockchain.IsCoinBase(tx) {
+			for _, txOut := range tx.MsgTx().TxOut {
+				totalOutputValue += txOut.Value
+			}
+		}
+	}
+
+	var totalFees, minFee, maxFee, minFeeRate, maxFeeRate, segwitCount,
+		segwitWeight, totalWeight, totalSize, minSize, maxSize, segwitSize int64
+	if txCount > 1 {
+		minFee = txStats[1]["fee"].(int64)
+		minFeeRate = txStats[1]["feeRate"].(int64)
+	}
+	for i := 0; i < len(txStats); i++ {
+		var fee, feeRate int64
+		tx := txStats[i]["tx"].(*btcutil.Tx)
+		if !blockchain.IsCoinBaseTx(tx.MsgTx()) {
+			// Fee statistics.
+			fee = txStats[i]["fee"].(int64)
+			feeRate = txStats[i]["feeRate"].(int64)
+			if minFee > fee {
+				minFee = fee
+			}
+			if maxFee < fee {
+				maxFee = fee
+			}
+			if minFeeRate > feeRate {
+				minFeeRate = feeRate
+			}
+			if maxFeeRate < feeRate {
+				maxFeeRate = feeRate
+			}
+			totalFees += txStats[i]["fee"].(int64)
+
+			// Segwit statistics.
+			if txStats[i]["segwit"].(bool) {
+				segwitCount++
+				segwitSize += txStats[i]["size"].(int64)
+				segwitWeight += txStats[i]["weight"].(int64)
+			}
+
+			// Size statistics.
+			size := txStats[i]["size"].(int64)
+			if minSize == 0 {
+				minSize = size
+			}
+			if maxSize < size {
+				maxSize = size
+			} else if minSize > size {
+				minSize = size
+			}
+			totalSize += txStats[i]["size"].(int64)
+
+			totalWeight += txStats[i]["weight"].(int64)
+		}
+	}
+
+	var avgFee, avgFeeRate, avgSize int64
+	if txCount > 1 {
+		avgFee = totalFees / int64(txCount-1)
+	}
+	if totalWeight != 0 {
+		avgFeeRate = totalFees * 4 / totalWeight
+	}
+	if txCount > 1 {
+		avgSize = totalSize / int64(txCount-1)
+	}
+
+	subsidy := blockchain.CalcBlockSubsidy(int32(blockHeight), s.cfg.ChainParams)
+
+	medianStat := func(stat string) int64 {
+		size := len(txStats) - 1
+		if size == 0 {
+			return 0
+		}
+		statArray := make([]int64, size)
+		// Start with the second element to ignore entry associated with coinbase.
+		for i, stats := range txStats[1:] {
+			statArray[i] = stats[stat].(int64)
+		}
+		sort.Slice(statArray, func(i, j int) bool {
+			return statArray[i] < statArray[j]
+		})
+		if size%2 == 0 {
+			return (statArray[size/2-1] + statArray[size/2]) / 2
+		}
+		return statArray[size/2]
+	}
+
+	var medianFee int64
+	if totalFees > 0 {
+		medianFee = medianStat("fee")
+	} else {
+		medianFee = 0
+	}
+	medianSize := medianStat("size")
+
+	// Calculate feerate percentiles.
+	var feeratePercentiles []int64
+	if allStats || calcFees {
+
+		// Sort by feerate.
+		sort.Slice(txStats, func(i, j int) bool {
+			return txStats[i]["feeRate"].(int64) < txStats[j]["feeRate"].(int64)
+		})
+		totalWeight := float64(totalWeight)
+
+		// Find 10th, 25th, 50th, 75th and 90th percentile weight units.
+		weights := []float64{
+			totalWeight / 10, totalWeight / 4, totalWeight / 2,
+			(totalWeight * 3) / 4, (totalWeight * 9) / 10}
+		var cumulativeWeight int64
+		feeratePercentiles = make([]int64, len(weights))
+		nextPercentileIndex := 0
+		for i := 0; i < len(txStats); i++ {
+			cumulativeWeight += txStats[i]["weight"].(int64)
+			for nextPercentileIndex < len(weights) && float64(cumulativeWeight) >= weights[nextPercentileIndex] {
+				feeratePercentiles[nextPercentileIndex] = txStats[i]["feeRate"].(int64)
+				nextPercentileIndex++
+			}
+		}
+
+		// Fill any remaining percentiles with the last value.
+		for i := nextPercentileIndex; i < len(weights); i++ {
+			feeratePercentiles[i] = txStats[len(txStats)-1]["feeRate"].(int64)
+		}
+	}
+
+	var blockHash string
+	if allStats || statsSet["blockhash"] {
+		blockHash = blk.Hash().String()
+	}
+
+	medianTime, err := medianBlockTime(blk.Hash(), s.cfg.Chain)
+	if err != nil {
+		context := "Failed to obtain block median time"
+		return nil, internalRPCError(err.Error(), context)
+	}
+
+	resultMap := map[string]int64{
+		"avgfee":         avgFee,
+		"avgfeerate":     avgFeeRate,
+		"avgtxsize":      avgSize,
+		"height":         int64(blockHeight),
+		"ins":            int64(inputCount - 1), // Coinbase input is not included.
+		"maxfee":         maxFee,
+		"maxfeerate":     maxFeeRate,
+		"maxtxsize":      maxSize,
+		"medianfee":      medianFee,
+		"mediantime":     medianTime.Unix(),
+		"mediantxsize":   medianSize,
+		"minfee":         minFee,
+		"minfeerate":     minFeeRate,
+		"mintxsize":      minSize,
+		"outs":           int64(outputCount),
+		"swtotal_size":   segwitSize,
+		"swtotal_weight": segwitWeight,
+		"swtxs":          segwitCount,
+		"subsidy":        subsidy,
+		"time":           blk.MsgBlock().Header.Timestamp.Unix(),
+		"total_out":      totalOutputValue,
+		"total_size":     totalSize,
+		"total_weight":   totalWeight,
+		"totalfee":       totalFees,
+		"txs":            int64(len(txs)),
+		"utxo_increase":  int64(outputCount - (inputCount - 1)),
+	}
+
+	// This function determines whether a statistic goes into the
+	// final result, except for blockhash and feerate_percentiles
+	// which are handled separately.
+	resultFilter := func(stat string) *int64 {
+		if allStats && s.cfg.TxIndex == nil {
+			// There are no fee statistics to send.
+			excludedStats := []string{"avgfee", "avgfeerate", "maxfee", "maxfeerate", "medianfee", "minfee", "minfeerate"}
+			for _, excluded := range excludedStats {
+				if stat == excluded {
+					return nil
+				}
+			}
+		}
+		if allStats || statsSet[stat] {
+			if value, ok := resultMap[stat]; ok {
+				return &value
+			}
+		}
+		return nil
+	}
+
+	result := &btcjson.GetBlockStatsResult{
+		AverageFee:         resultFilter("avgfee"),
+		AverageFeeRate:     resultFilter("avgfeerate"),
+		AverageTxSize:      resultFilter("avgtxsize"),
+		FeeratePercentiles: &feeratePercentiles,
+		Hash:               &blockHash,
+		Height:             resultFilter("height"),
+		Ins:                resultFilter("ins"),
+		MaxFee:             resultFilter("maxfee"),
+		MaxFeeRate:         resultFilter("maxfeerate"),
+		MaxTxSize:          resultFilter("maxtxsize"),
+		MedianFee:          resultFilter("medianfee"),
+		MedianTime:         resultFilter("mediantime"),
+		MedianTxSize:       resultFilter("mediantxsize"),
+		MinFee:             resultFilter("minfee"),
+		MinFeeRate:         resultFilter("minfeerate"),
+		MinTxSize:          resultFilter("mintxsize"),
+		Outs:               resultFilter("outs"),
+		SegWitTotalSize:    resultFilter("swtotal_size"),
+		SegWitTotalWeight:  resultFilter("swtotal_weight"),
+		SegWitTxs:          resultFilter("swtxs"),
+		Subsidy:            resultFilter("subsidy"),
+		Time:               resultFilter("time"),
+		TotalOut:           resultFilter("total_out"),
+		TotalSize:          resultFilter("total_size"),
+		TotalWeight:        resultFilter("total_weight"),
+		TotalFee:           resultFilter("totalfee"),
+		Txs:                resultFilter("txs"),
+		UTXOIncrease:       resultFilter("utxo_increase"),
+		UTXOSizeIncrease:   resultFilter("utxo_size_inc"),
+	}
+	return result, nil
+}
+
+// calculateFee returns the fee of a transaction.
+func calculateFee(tx *btcutil.Tx, txIndex *indexers.TxIndex, db database.DB) (int64, error) {
+	var inValue, outValue int64
+	for _, input := range tx.MsgTx().TxIn {
+		prevTxHash := input.PreviousOutPoint.Hash
+		// Look up the location of the previous transaction in the index.
+		blockRegion, err := txIndex.TxBlockRegion(&prevTxHash)
+		if err != nil {
+			context := "Failed to retrieve transaction location"
+			return 0, internalRPCError(err.Error(), context)
+		}
+		if blockRegion == nil {
+			return 0, rpcNoTxInfoError(&prevTxHash)
+		}
+
+		// Load the raw transaction bytes from the database.
+		var txBytes []byte
+		err = db.View(func(dbTx database.Tx) error {
+			var err error
+			txBytes, err = dbTx.FetchBlockRegion(blockRegion)
+			return err
+		})
+		if err != nil {
+			return 0, rpcNoTxInfoError(&prevTxHash)
+		}
+
+		var msgTx wire.MsgTx
+		err = msgTx.Deserialize(bytes.NewReader(txBytes))
+		if err != nil {
+			context := "Failed to deserialize transaction"
+			return 0, internalRPCError(err.Error(), context)
+		}
+		prevOutValue := msgTx.TxOut[input.PreviousOutPoint.Index].Value
+		inValue += prevOutValue
+	}
+	for _, output := range tx.MsgTx().TxOut {
+		outValue += output.Value
+	}
+	fee := inValue - outValue
+	return fee, nil
+}
+
+// medianBlockTime returns the median time of a block and its 10 previous blocks
+// as per BIP113.
+func medianBlockTime(blockHash *chainhash.Hash, chain *blockchain.BlockChain) (*time.Time, error) {
+	blockTimes := make([]time.Time, 0)
+	currentHash := blockHash
+	for i := 0; i < 11; i++ {
+		header, err := chain.HeaderByHash(currentHash)
+		if err != nil {
+			return nil, err
+		}
+		blockTimes = append(blockTimes, header.Timestamp)
+		genesisPrevBlock, _ := chainhash.NewHashFromStr("0000000000000000000000000000000000000000000000000000000000000000")
+		if header.PrevBlock.IsEqual(genesisPrevBlock) {
+			// This is the genesis block so there's no need to iterate further.
+			break
+		}
+		currentHash = &header.PrevBlock
+	}
+	sort.Slice(blockTimes, func(i, j int) bool {
+		return blockTimes[i].Before(blockTimes[j])
+	})
+	return &blockTimes[len(blockTimes)/2], nil
+}
+
 // encodeTemplateID encodes the passed details into an ID that can be used to
 // uniquely identify a block template.
 func encodeTemplateID(prevHash *chainhash.Hash, lastGenerated time.Time) string {
@@ -1925,7 +2368,6 @@ func (state *gbtWorkState) blockTemplateResult(useCoinbaseValue bool, submitOld
 
 	if useCoinbaseValue {
 		reply.CoinbaseAux = gbtCoinbaseAux
-		reply.CoinbaseValue = &msgBlock.Transactions[0].TxOut[0].Value
 	} else {
 		// Ensure the template has a valid payment address associated
 		// with it when a full coinbase is requested.
@@ -1958,6 +2400,9 @@ func (state *gbtWorkState) blockTemplateResult(useCoinbaseValue bool, submitOld
 		reply.CoinbaseTxn = &resultTx
 	}
 
+	// Return coinbasevalue anyway as lbrycrd and bitcoind do.
+	reply.CoinbaseValue = &msgBlock.Transactions[0].TxOut[0].Value
+
 	return &reply, nil
 }
 

rpcserverhelp.go

@@ -49,10 +49,10 @@ var helpDescsEnUS = map[string]string{
 		"The transaction inputs are not signed in the created transaction.\n" +
 		"The signrawtransaction RPC command provided by wallet must be used to sign the resulting transaction.",
 	"createrawtransaction-inputs":         "The inputs to the transaction",
-	"createrawtransaction-amounts":        "JSON object with the destination addresses as keys and amounts as values",
-	"createrawtransaction-amounts--key":   "address",
-	"createrawtransaction-amounts--value": "n.nnn",
-	"createrawtransaction-amounts--desc":  "The destination address as the key and the amount in LBC as the value",
+	"createrawtransaction-outputs":        "JSON object with the destination addresses as keys and amounts as values",
+	"createrawtransaction-outputs--key":   "address or \"data\"",
+	"createrawtransaction-outputs--value": "value in BTC as floating point number or hex-encoded data for \"data\"",
+	"createrawtransaction-outputs--desc":  "The destination address as the key and the amount in LBC as the value",
 	"createrawtransaction-locktime":       "Locktime value; a non-zero value will also locktime-activate the inputs",
 	"createrawtransaction--result0":       "Hex-encoded bytes of the serialized transaction",
 
@@ -200,6 +200,43 @@ var helpDescsEnUS = map[string]string{
 	"getblockchaininforesult-softforks":            "The status of the super-majority soft-forks",
 	"getblockchaininforesult-unifiedsoftforks":     "The status of the super-majority soft-forks used by bitcoind on or after v0.19.0",
 
+	// GetBlockStatsCmd help.
+	"getblockstats--synopsis":    "Returns statistics about a block given its hash or height. --txindex must be enabled for fee and feerate statistics.",
+	"getblockstats-hashorheight": "The hash or height of the block",
+	"hashorheight-value":         "The hash or height of the block",
+	"getblockstats-stats":        "Selected statistics",
+
+	// GetBlockStatsResult help.
+	"getblockstatsresult-avgfee":              "The average fee in the block",
+	"getblockstatsresult-avgfeerate":          "The average feerate in the block (in satoshis per virtual byte)",
+	"getblockstatsresult-avgtxsize":           "The average transaction size in the block",
+	"getblockstatsresult-blockhash":           "The block hash",
+	"getblockstatsresult-feerate_percentiles": "Feerates at the 10th, 25th, 50th, 75th, and 90th percentile weight unit (in satoshis per virtual byte)",
+	"getblockstatsresult-height":              "The block height",
+	"getblockstatsresult-ins":                 "The number of inputs (excluding coinbase)",
+	"getblockstatsresult-maxfee":              "Maxium fee in the block",
+	"getblockstatsresult-maxfeerate":          "Maximum feerate in the block (in satoshis per virtual byte)",
+	"getblockstatsresult-maxtxsize":           "Maximum transaction size",
+	"getblockstatsresult-medianfee":           "Truncated median fee",
+	"getblockstatsresult-mediantime":          "The median time from the block and its previous 10 blocks (BIP113)",
+	"getblockstatsresult-mediantxsize":        "Truncated median transaction size",
+	"getblockstatsresult-minfee":              "Minimum fee in the block",
+	"getblockstatsresult-minfeerate":          "Minimum feerate in the block (in satoshis per virtual byte)",
+	"getblockstatsresult-mintxsize":           "Minimum transaction size",
+	"getblockstatsresult-outs":                "The number of outputs",
+	"getblockstatsresult-subsidy":             "The block subsidy",
+	"getblockstatsresult-swtotal_size":        "Total size of all segwit transactions in the block (excluding coinbase)",
+	"getblockstatsresult-swtotal_weight":      "Total weight of all segwit transactions in the block (excluding coinbase)",
+	"getblockstatsresult-swtxs":               "The number of segwit transactions in the block (excluding coinbase)",
+	"getblockstatsresult-time":                "The block time",
+	"getblockstatsresult-total_out":           "Total amount in all outputs (excluding coinbase)",
+	"getblockstatsresult-total_size":          "Total size of all transactions (excluding coinbase)",
+	"getblockstatsresult-total_weight":        "Total weight of all transactions (excluding coinbase)",
+	"getblockstatsresult-totalfee":            "The total of fees",
+	"getblockstatsresult-txs":                 "The number of transactions (excluding coinbase)",
+	"getblockstatsresult-utxo_increase":       "The increase/decrease in the number of unspent outputs",
+	"getblockstatsresult-utxo_size_inc":       "The increase/decrease in size for the utxo index",
+
 	// SoftForkDescription help.
 	"softforkdescription-reject":  "The current activation status of the softfork",
 	"softforkdescription-version": "The block version that signals enforcement of this softfork",
@@ -917,6 +954,7 @@ var rpcResultTypes = map[string][]interface{}{
 	"getblockcount":          {(*int64)(nil)},
 	"getblockhash":           {(*string)(nil)},
 	"getblockheader":         {(*string)(nil), (*btcjson.GetBlockHeaderVerboseResult)(nil)},
+	"getblockstats":          {(*btcjson.GetBlockStatsResult)(nil)},
 	"getblocktemplate":       {(*btcjson.GetBlockTemplateResult)(nil), (*string)(nil), nil},
 	"getcfilter":             {(*string)(nil)},
 	"getcfilterheader":       {(*string)(nil)},

txscript/claimscript.go

@@ -206,7 +206,7 @@ func StripClaimScriptPrefix(script []byte) []byte {
 	return script[cs.Size:]
 }
 
-const illegalChars = "=&#:*$%?/;\\\b\n\t\r\x00"
+const illegalChars = "=&#:$%?/;\\\b\n\t\r\x00"
 
 func AllClaimsAreSane(script []byte, enforceSoftFork bool) error {
 	cs, err := ExtractClaimScript(script)