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[lbry] rpc: support claim related methods

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This commit is contained in:
Brannon King 2021-07-30 16:24:14 -04:00 committed by Roy Lee
parent 470a71fbe1
commit 7f3d51f8c3
7 changed files with 553 additions and 3 deletions
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7
btcjson/chainsvrresults.go
View file

@ -298,6 +298,8 @@ type GetBlockTemplateResult struct {
// Block proposal from BIP 0023.
Capabilities []string `json:"capabilities,omitempty"`
RejectReasion string `json:"reject-reason,omitempty"`
ClaimTrieHash string `json:"claimtrie"`
}
// GetMempoolEntryResult models the data returned from the getmempoolentry's
@ -430,6 +432,9 @@ type ScriptPubKeyResult struct {
Hex string `json:"hex,omitempty"`
ReqSigs int32 `json:"reqSigs,omitempty"`
Type string `json:"type"`
SubType string `json:"subtype"`
IsClaim bool `json:"isclaim"`
IsSupport bool `json:"issupport"`
Addresses []string `json:"addresses,omitempty"`
}
@ -588,6 +593,8 @@ func (v *Vin) MarshalJSON() ([]byte, error) {
type PrevOut struct {
Addresses []string `json:"addresses,omitempty"`
Value float64 `json:"value"`
IsClaim bool `json:"isclaim"`
IsSupport bool `json:"issupport"`
}
// VinPrevOut is like Vin except it includes PrevOut. It is used by searchrawtransaction

2
btcjson/chainsvrresults_test.go
View file

@ -70,7 +70,7 @@ func TestChainSvrCustomResults(t *testing.T) {
},
Sequence: 4294967295,
},
expected: `{"txid":"123","vout":1,"scriptSig":{"asm":"0","hex":"00"},"prevOut":{"addresses":["addr1"],"value":0},"sequence":4294967295}`,
expected: `{"txid":"123","vout":1,"scriptSig":{"asm":"0","hex":"00"},"prevOut":{"addresses":["addr1"],"value":0,"isclaim":false,"issupport":false},"sequence":4294967295}`,
},
}

97
btcjson/claimcmds.go Normal file
View file

@ -0,0 +1,97 @@
package btcjson
func init() {
// No special flags for commands in this file.
flags := UsageFlag(0)
MustRegisterCmd("getchangesinblock", (*GetChangesInBlockCmd)(nil), flags)
MustRegisterCmd("getclaimsforname", (*GetClaimsForNameCmd)(nil), flags)
MustRegisterCmd("getclaimsfornamebyid", (*GetClaimsForNameByIDCmd)(nil), flags)
MustRegisterCmd("getclaimsfornamebybid", (*GetClaimsForNameByBidCmd)(nil), flags)
MustRegisterCmd("getclaimsfornamebyseq", (*GetClaimsForNameBySeqCmd)(nil), flags)
MustRegisterCmd("normalize", (*GetNormalizedCmd)(nil), flags)
}
// optional inputs are required to be pointers, but they support things like `jsonrpcdefault:"false"`
// optional inputs have to be at the bottom of the struct
// optional outputs require ",omitempty"
// traditional bitcoin fields are all lowercase
type GetChangesInBlockCmd struct {
HashOrHeight *string `json:"hashorheight" jsonrpcdefault:""`
}
type GetChangesInBlockResult struct {
Hash string `json:"hash"`
Height int32 `json:"height"`
Names []string `json:"names"`
}
type GetClaimsForNameCmd struct {
Name string `json:"name"`
HashOrHeight *string `json:"hashorheight" jsonrpcdefault:""`
IncludeValues *bool `json:"includevalues" jsonrpcdefault:"false"`
}
type GetClaimsForNameByIDCmd struct {
Name string `json:"name"`
PartialClaimIDs []string `json:"partialclaimids"`
HashOrHeight *string `json:"hashorheight" jsonrpcdefault:""`
IncludeValues *bool `json:"includevalues" jsonrpcdefault:"false"`
}
type GetClaimsForNameByBidCmd struct {
Name string `json:"name"`
Bids []int32 `json:"bids"`
HashOrHeight *string `json:"hashorheight" jsonrpcdefault:""`
IncludeValues *bool `json:"includevalues" jsonrpcdefault:"false"`
}
type GetClaimsForNameBySeqCmd struct {
Name string `json:"name"`
Sequences []int32 `json:"sequences" jsonrpcusage:"[sequence,...]"`
HashOrHeight *string `json:"hashorheight" jsonrpcdefault:""`
IncludeValues *bool `json:"includevalues" jsonrpcdefault:"false"`
}
type GetClaimsForNameResult struct {
Hash string `json:"hash"`
Height int32 `json:"height"`
LastTakeoverHeight int32 `json:"lasttakeoverheight"`
NormalizedName string `json:"normalizedname"`
Claims []ClaimResult `json:"claims"`
// UnclaimedSupports []SupportResult `json:"supportswithoutclaim"` how would this work with other constraints?
}
type SupportResult struct {
TXID string `json:"txid"`
N uint32 `json:"n"`
Height int32 `json:"height"`
ValidAtHeight int32 `json:"validatheight"`
Amount int64 `json:"amount"`
Address string `json:"address,omitempty"`
Value string `json:"value,omitempty"`
}
type ClaimResult struct {
ClaimID string `json:"claimid"`
TXID string `json:"txid"`
N uint32 `json:"n"`
Bid int32 `json:"bid"`
Sequence int32 `json:"sequence"`
Height int32 `json:"height"`
ValidAtHeight int32 `json:"validatheight"`
Amount int64 `json:"amount"`
EffectiveAmount int64 `json:"effectiveamount"`
Supports []SupportResult `json:"supports,omitempty"`
Address string `json:"address,omitempty"`
Value string `json:"value,omitempty"`
}
type GetNormalizedCmd struct {
Name string `json:"name"`
}
type GetNormalizedResult struct {
NormalizedName string `json:"normalizedname"`
}

6
btcjson/help.go
View file

@ -547,6 +547,12 @@ func GenerateHelp(method string, descs map[string]string, resultTypes ...interfa
return desc
}
if strings.Contains(key, "base-") {
if desc, ok := descs[strings.ReplaceAll(key, "base-", "-")]; ok {
return desc
}
}
missingKey = key
return key
}

8
btcjson/jsonrpc.go
View file

@ -226,8 +226,12 @@ func NewResponse(rpcVersion RPCVersion, id interface{}, marshalledResult []byte,
// JSON-RPC client.
func MarshalResponse(rpcVersion RPCVersion, id interface{}, result interface{}, rpcErr *RPCError) ([]byte, error) {
if !rpcVersion.IsValid() {
str := fmt.Sprintf("rpcversion '%s' is invalid", rpcVersion)
return nil, makeError(ErrInvalidType, str)
if rpcVersion == "" {
rpcVersion = RpcVersion1
} else {
str := fmt.Sprintf("rpcversion '%s' is unsupported", rpcVersion)
return nil, makeError(ErrInvalidType, str)
}
}
marshalledResult, err := json.Marshal(result)

352
rpcclaimtrie.go Normal file
View file

@ -0,0 +1,352 @@
package main
import (
"bytes"
"encoding/hex"
"strconv"
"strings"
"github.com/lbryio/lbcd/btcjson"
"github.com/lbryio/lbcd/chaincfg/chainhash"
"github.com/lbryio/lbcd/claimtrie/node"
"github.com/lbryio/lbcd/claimtrie/normalization"
"github.com/lbryio/lbcd/database"
"github.com/lbryio/lbcd/txscript"
"github.com/lbryio/lbcd/wire"
)
var claimtrieHandlers = map[string]commandHandler{
"getchangesinblock": handleGetChangesInBlock,
"getclaimsforname": handleGetClaimsForName,
"getclaimsfornamebyid": handleGetClaimsForNameByID,
"getclaimsfornamebybid": handleGetClaimsForNameByBid,
"getclaimsfornamebyseq": handleGetClaimsForNameBySeq,
"normalize": handleGetNormalized,
}
func handleGetChangesInBlock(s *rpcServer, cmd interface{}, _ <-chan struct{}) (interface{}, error) {
c := cmd.(*btcjson.GetChangesInBlockCmd)
hash, height, err := parseHashOrHeight(s, c.HashOrHeight)
if err != nil {
return nil, err
}
names, err := s.cfg.Chain.GetNamesChangedInBlock(height)
if err != nil {
return nil, &btcjson.RPCError{
Code: btcjson.ErrRPCMisc,
Message: "Message: " + err.Error(),
}
}
return btcjson.GetChangesInBlockResult{
Hash: hash,
Height: height,
Names: names,
}, nil
}
func parseHashOrHeight(s *rpcServer, hashOrHeight *string) (string, int32, error) {
if hashOrHeight == nil || len(*hashOrHeight) == 0 {
if !s.cfg.Chain.IsCurrent() {
return "", 0, &btcjson.RPCError{
Code: btcjson.ErrRPCClientInInitialDownload,
Message: "Unable to query the chain tip during initial download",
}
}
// just give them the latest block if a specific one wasn't requested
best := s.cfg.Chain.BestSnapshot()
return best.Hash.String(), best.Height, nil
}
ht, err := strconv.ParseInt(*hashOrHeight, 10, 32)
if err == nil && len(*hashOrHeight) < 32 {
hs, err := s.cfg.Chain.BlockHashByHeight(int32(ht))
if err != nil {
return "", 0, &btcjson.RPCError{
Code: btcjson.ErrRPCBlockNotFound,
Message: "Unable to locate a block at height " + *hashOrHeight + ": " + err.Error(),
}
}
return hs.String(), int32(ht), nil
}
hs, err := chainhash.NewHashFromStr(*hashOrHeight)
if err != nil {
return "", 0, &btcjson.RPCError{
Code: btcjson.ErrRPCInvalidParameter,
Message: "Unable to parse a height or hash from " + *hashOrHeight + ": " + err.Error(),
}
}
h, err := s.cfg.Chain.BlockHeightByHash(hs)
if err != nil {
return hs.String(), h, &btcjson.RPCError{
Code: btcjson.ErrRPCBlockNotFound,
Message: "Unable to find a block with hash " + hs.String() + ": " + err.Error(),
}
}
return hs.String(), h, nil
}
func handleGetClaimsForName(s *rpcServer, cmd interface{}, _ <-chan struct{}) (interface{}, error) {
c := cmd.(*btcjson.GetClaimsForNameCmd)
hash, height, err := parseHashOrHeight(s, c.HashOrHeight)
if err != nil {
return nil, err
}
name, n, err := s.cfg.Chain.GetClaimsForName(height, c.Name)
if err != nil {
return nil, &btcjson.RPCError{
Code: btcjson.ErrRPCMisc,
Message: "Message: " + err.Error(),
}
}
var results []btcjson.ClaimResult
for i := range n.Claims {
cr, err := toClaimResult(s, int32(i), n, c.IncludeValues)
if err != nil {
return nil, err
}
results = append(results, cr)
}
return btcjson.GetClaimsForNameResult{
Hash: hash,
Height: height,
LastTakeoverHeight: n.TakenOverAt,
NormalizedName: name,
Claims: results,
}, nil
}
func handleGetClaimsForNameByID(s *rpcServer, cmd interface{}, _ <-chan struct{}) (interface{}, error) {
c := cmd.(*btcjson.GetClaimsForNameByIDCmd)
hash, height, err := parseHashOrHeight(s, c.HashOrHeight)
if err != nil {
return nil, err
}
name, n, err := s.cfg.Chain.GetClaimsForName(height, c.Name)
if err != nil {
return nil, &btcjson.RPCError{
Code: btcjson.ErrRPCMisc,
Message: "Message: " + err.Error(),
}
}
var results []btcjson.ClaimResult
for i := 0; i < len(n.Claims); i++ {
for _, id := range c.PartialClaimIDs {
if strings.HasPrefix(n.Claims[i].ClaimID.String(), id) {
cr, err := toClaimResult(s, int32(i), n, c.IncludeValues)
if err != nil {
return nil, err
}
results = append(results, cr)
break
}
}
}
return btcjson.GetClaimsForNameResult{
Hash: hash,
Height: height,
LastTakeoverHeight: n.TakenOverAt,
NormalizedName: name,
Claims: results,
}, nil
}
func handleGetClaimsForNameByBid(s *rpcServer, cmd interface{}, _ <-chan struct{}) (interface{}, error) {
c := cmd.(*btcjson.GetClaimsForNameByBidCmd)
hash, height, err := parseHashOrHeight(s, c.HashOrHeight)
if err != nil {
return nil, err
}
name, n, err := s.cfg.Chain.GetClaimsForName(height, c.Name)
if err != nil {
return nil, &btcjson.RPCError{
Code: btcjson.ErrRPCMisc,
Message: "Message: " + err.Error(),
}
}
var results []btcjson.ClaimResult
for _, b := range c.Bids { // claims are already sorted in bid order
if b >= 0 && int(b) < len(n.Claims) {
cr, err := toClaimResult(s, b, n, c.IncludeValues)
if err != nil {
return nil, err
}
results = append(results, cr)
}
}
return btcjson.GetClaimsForNameResult{
Hash: hash,
Height: height,
LastTakeoverHeight: n.TakenOverAt,
NormalizedName: name,
Claims: results,
}, nil
}
func handleGetClaimsForNameBySeq(s *rpcServer, cmd interface{}, _ <-chan struct{}) (interface{}, error) {
c := cmd.(*btcjson.GetClaimsForNameBySeqCmd)
hash, height, err := parseHashOrHeight(s, c.HashOrHeight)
if err != nil {
return nil, err
}
name, n, err := s.cfg.Chain.GetClaimsForName(height, c.Name)
if err != nil {
return nil, &btcjson.RPCError{
Code: btcjson.ErrRPCMisc,
Message: "Message: " + err.Error(),
}
}
sm := map[int32]bool{}
for _, seq := range c.Sequences {
sm[seq] = true
}
var results []btcjson.ClaimResult
for i := 0; i < len(n.Claims); i++ {
if sm[n.Claims[i].Sequence] {
cr, err := toClaimResult(s, int32(i), n, c.IncludeValues)
if err != nil {
return nil, err
}
results = append(results, cr)
}
}
return btcjson.GetClaimsForNameResult{
Hash: hash,
Height: height,
LastTakeoverHeight: n.TakenOverAt,
NormalizedName: name,
Claims: results,
}, nil
}
func toClaimResult(s *rpcServer, i int32, n *node.Node, includeValues *bool) (btcjson.ClaimResult, error) {
claim := n.Claims[i]
address, value, err := lookupValue(s, claim.OutPoint, includeValues)
supports, err := toSupportResults(s, i, n, includeValues)
effectiveAmount := n.SupportSums[claim.ClaimID.Key()] // should only be active supports
if claim.Status == node.Activated {
effectiveAmount += claim.Amount
}
return btcjson.ClaimResult{
ClaimID: claim.ClaimID.String(),
Height: claim.AcceptedAt,
ValidAtHeight: claim.ActiveAt,
TXID: claim.OutPoint.Hash.String(),
N: claim.OutPoint.Index,
Bid: i, // assuming sorted by bid
Amount: claim.Amount,
EffectiveAmount: effectiveAmount,
Sequence: claim.Sequence,
Supports: supports,
Address: address,
Value: value,
}, err
}
func toSupportResults(s *rpcServer, i int32, n *node.Node, includeValues *bool) ([]btcjson.SupportResult, error) {
var results []btcjson.SupportResult
c := n.Claims[i]
for _, sup := range n.Supports {
if sup.Status == node.Activated && c.ClaimID == sup.ClaimID {
address, value, err := lookupValue(s, sup.OutPoint, includeValues)
if err != nil {
return results, err
}
results = append(results, btcjson.SupportResult{
TXID: sup.OutPoint.Hash.String(),
N: sup.OutPoint.Index,
Height: sup.AcceptedAt,
ValidAtHeight: sup.ActiveAt,
Amount: sup.Amount,
Value: value,
Address: address,
})
}
}
return results, nil
}
func lookupValue(s *rpcServer, outpoint wire.OutPoint, includeValues *bool) (string, string, error) {
if includeValues == nil || !*includeValues {
return "", "", nil
}
// TODO: maybe use addrIndex if the txIndex is not available
if s.cfg.TxIndex == nil {
return "", "", &btcjson.RPCError{
Code: btcjson.ErrRPCNoTxInfo,
Message: "The transaction index must be " +
"enabled to query the blockchain " +
"(specify --txindex)",
}
}
txHash := &outpoint.Hash
blockRegion, err := s.cfg.TxIndex.TxBlockRegion(txHash)
if err != nil {
context := "Failed to retrieve transaction location"
return "", "", internalRPCError(err.Error(), context)
}
if blockRegion == nil {
return "", "", rpcNoTxInfoError(txHash)
}
// Load the raw transaction bytes from the database.
var txBytes []byte
err = s.cfg.DB.View(func(dbTx database.Tx) error {
var err error
txBytes, err = dbTx.FetchBlockRegion(blockRegion)
return err
})
if err != nil {
return "", "", rpcNoTxInfoError(txHash)
}
// Deserialize the transaction
var msgTx wire.MsgTx
err = msgTx.Deserialize(bytes.NewReader(txBytes))
if err != nil {
context := "Failed to deserialize transaction"
return "", "", internalRPCError(err.Error(), context)
}
txo := msgTx.TxOut[outpoint.Index]
cs, err := txscript.ExtractClaimScript(txo.PkScript)
if err != nil {
context := "Failed to decode the claim script"
return "", "", internalRPCError(err.Error(), context)
}
_, addresses, _, _ := txscript.ExtractPkScriptAddrs(txo.PkScript[cs.Size:], s.cfg.ChainParams)
return addresses[0].EncodeAddress(), hex.EncodeToString(cs.Value), nil
}
func handleGetNormalized(_ *rpcServer, cmd interface{}, _ <-chan struct{}) (interface{}, error) {
c := cmd.(*btcjson.GetNormalizedCmd)
r := btcjson.GetNormalizedResult{
NormalizedName: string(normalization.Normalize([]byte(c.Name))),
}
return r, nil
}

84
rpcserverhelp.go
View file

@ -247,6 +247,7 @@ var helpDescsEnUS = map[string]string{
"getblockverboseresult-version": "The block version",
"getblockverboseresult-versionHex": "The block version in hexadecimal",
"getblockverboseresult-merkleroot": "Root hash of the merkle tree",
"getblockverboseresult-nameclaimroot": "Root hash of the claim trie",
"getblockverboseresult-tx": "The transaction hashes (only when verbosity=1)",
"getblockverboseresult-rawtx": "The transactions as JSON objects (only when verbosity=2)",
"getblockverboseresult-time": "The block time in seconds since 1 Jan 1970 GMT",
@ -288,6 +289,7 @@ var helpDescsEnUS = map[string]string{
"getblockheaderverboseresult-difficulty": "The proof-of-work difficulty as a multiple of the minimum difficulty",
"getblockheaderverboseresult-previousblockhash": "The hash of the previous block",
"getblockheaderverboseresult-nextblockhash": "The hash of the next block (only if there is one)",
"getblockheaderverboseresult-nameclaimroot": "The hash of the root of the claim trie",
// TemplateRequest help.
"templaterequest-mode": "This is 'template', 'proposal', or omitted",
@ -339,6 +341,8 @@ var helpDescsEnUS = map[string]string{
"getblocktemplateresult-reject-reason": "Reason the proposal was invalid as-is (only applies to proposal responses)",
"getblocktemplateresult-default_witness_commitment": "The witness commitment itself. Will be populated if the block has witness data",
"getblocktemplateresult-weightlimit": "The current limit on the max allowed weight of a block",
"getblocktemplateresult-rules": "Rules that are required to process the output",
"getblocktemplateresult-claimtrie": "The hash of the root of the claim trie - a necessary block header",
// GetBlockTemplateCmd help.
"getblocktemplate--synopsis": "Returns a JSON object with information necessary to construct a block to mine or accepts a proposal to validate.\n" +
@ -708,6 +712,78 @@ var helpDescsEnUS = map[string]string{
"versionresult-patch": "The patch component of the JSON-RPC API version",
"versionresult-prerelease": "Prerelease info about the current build",
"versionresult-buildmetadata": "Metadata about the current build",
"getclaimsforname--synopsis": "Look up claims for the given name as they stand at a give block",
"getclaimsfornamebyid--synopsis": "Look up claims for the given name as they stand at a give block",
"getclaimsfornamebybid--synopsis": "Look up claims for the given name as they stand at a give block",
"getclaimsfornamebyseq--synopsis": "Look up claims for the given name as they stand at a give block",
"getclaimsforname-hashorheight": "Requested block hash or height; default to tip",
"getclaimsfornamebyid-hashorheight": "Requested block hash or height; default to tip",
"getclaimsfornamebybid-hashorheight": "Requested block hash or height; default to tip",
"getclaimsfornamebyseq-hashorheight": "Requested block hash or height; default to tip",
"getclaimsforname-name": "Requested name for lookup",
"getclaimsfornamebyid-name": "Requested name for lookup",
"getclaimsfornamebybid-name": "Requested name for lookup",
"getclaimsfornamebyseq-name": "Requested name for lookup",
"getclaimsfornamebyid-partialclaimids": "Limit the returned claims to those with matching (partial) claimIDs in this list",
"getclaimsfornamebybid-bids": "Limit the returned claims to those with bids to this list",
"getclaimsfornamebyseq-sequences": "Limit the returned claims to those with bids to this list",
"getclaimsforname-includevalues": "Return the metadata and address",
"getclaimsfornamebyseq-includevalues": "Return the metadata and address",
"getclaimsfornamebybid-includevalues": "Return the metadata and address",
"getclaimsfornamebyid-includevalues": "Return the metadata and address",
"getclaimsfornameresult-claims": "All the active claims on the given name",
"getclaimsfornameresult-normalizedname": "Lower-case version of the passed-in name",
"getclaimsfornameresult-height": "Height of the requested block",
"getclaimsfornameresult-lasttakeoverheight": "Height of the most recent name takeover",
"getclaimsfornameresult-hash": "Hash of the requested block",
"getchangesinblock--synopsis": "Returns a list of names affected by a given block",
"getchangesinblockresult-names": "Names that changed (or were at least checked for change) on the given height",
"getchangesinblockresult-height": "Height that was requested",
"getchangesinblockresult-hash": "Hash of the block at the height requested",
"scriptpubkeyresult-subtype": "Claims return Non-standard address types, but they use standard address types internally exposed here",
"supportresult-value": "This is the metadata given as part of the support",
"supportresult-txid": "The hash of the transaction",
"supportresult-n": "The output (TXO) index",
"supportresult-address": "The destination address for the support",
"supportresult-amount": "LBC staked",
"supportresult-height": "The height when the stake was created or updated",
"supportresult-validatheight": "The height when the stake becomes valid",
"claimresult-value": "This is the metadata given as part of the claim",
"claimresult-txid": "The hash of the transaction",
"claimresult-n": "The output (TXO) index",
"claimresult-address": "The destination address for the claim",
"claimresult-supports": "The list of supports active on the claim",
"claimresult-validatheight": "The height when the stake becomes valid",
"claimresult-height": "The height when the stake was created or updated",
"claimresult-amount": "The stake amount in sats",
"claimresult-effectiveamount": "The stake amount plus the active supports' amounts",
"claimresult-sequence": "The order this claim was created compared to other claims on this name",
"claimresult-bid": "Bid of 0 means that this claim currently owns the name",
"claimresult-claimid": "20-byte hash of TXID:N, often used in indexes for the claims",
"generatetoaddress--synopsis": "Mine blocks and send their reward to a given address",
"generatetoaddress--result0": "The list of generated blocks' hashes",
"generatetoaddress-maxtries": "The maximum number of hashes to attempt",
"generatetoaddress-address": "The destination -- the place where the LBC will be sent",
"generatetoaddress-numblocks": "The number of blocks to mine",
"getchangesinblock-hashorheight": "The requested height or block hash whose changes are of interest",
"normalize--synopsis": "Used to show how lbcd will normalize a string",
"normalize--result0": "The normalized name",
"normalize-name": "The string to be normalized",
"getblockverboseresult-getblockverboseresultbase": "",
"prevout-issupport": "Previous output created a support",
"prevout-isclaim": "Previous output created or updated a claim",
}
// rpcResultTypes specifies the result types that each RPC command can return.
@ -776,6 +852,14 @@ var rpcResultTypes = map[string][]interface{}{
"stopnotifyspent": nil,
"rescan": nil,
"rescanblocks": {(*[]btcjson.RescannedBlock)(nil)},
// ClaimTrie
"getclaimsforname": {(*btcjson.GetClaimsForNameResult)(nil)},
"getclaimsfornamebyid": {(*btcjson.GetClaimsForNameResult)(nil)},
"getclaimsfornamebybid": {(*btcjson.GetClaimsForNameResult)(nil)},
"getclaimsfornamebyseq": {(*btcjson.GetClaimsForNameResult)(nil)},
"normalize": {(*string)(nil)},
"getchangesinblock": {(*btcjson.GetChangesInBlockResult)(nil)},
}
// helpCacher provides a concurrent safe type that provides help and usage for