lbcwallet/cmdmgr.go

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/*
* Copyright (c) 2013 Conformal Systems LLC <info@conformal.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package main
import (
"encoding/json"
"fmt"
"github.com/conformal/btcjson"
"github.com/conformal/btcwallet/wallet"
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"sync"
"time"
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)
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// Errors
var (
// Standard JSON-RPC 2.0 errors
InvalidRequest = btcjson.Error{
Code: -32600,
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Message: "Invalid request",
}
MethodNotFound = btcjson.Error{
Code: -32601,
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Message: "Method not found",
}
InvalidParams = btcjson.Error{
Code: -32602,
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Message: "Invalid paramaters",
}
InternalError = btcjson.Error{
Code: -32603,
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Message: "Internal error",
}
ParseError = btcjson.Error{
Code: -32700,
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Message: "Parse error",
}
// General application defined errors
MiscError = btcjson.Error{
Code: -1,
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Message: "Miscellaneous error",
}
ForbiddenBySafeMode = btcjson.Error{
Code: -2,
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Message: "Server is in safe mode, and command is not allowed in safe mode",
}
TypeError = btcjson.Error{
Code: -3,
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Message: "Unexpected type was passed as parameter",
}
InvalidAddressOrKey = btcjson.Error{
Code: -5,
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Message: "Invalid address or key",
}
OutOfMemory = btcjson.Error{
Code: -7,
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Message: "Ran out of memory during operation",
}
InvalidParameter = btcjson.Error{
Code: -8,
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Message: "Invalid, missing or duplicate parameter",
}
DatabaseError = btcjson.Error{
Code: -20,
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Message: "Database error",
}
DeserializationError = btcjson.Error{
Code: -22,
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Message: "Error parsing or validating structure in raw format",
}
// Wallet errors
WalletError = btcjson.Error{
Code: -4,
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Message: "Unspecified problem with wallet",
}
WalletInsufficientFunds = btcjson.Error{
Code: -6,
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Message: "Not enough funds in wallet or account",
}
WalletInvalidAccountName = btcjson.Error{
Code: -11,
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Message: "Invalid account name",
}
WalletKeypoolRanOut = btcjson.Error{
Code: -12,
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Message: "Keypool ran out, call keypoolrefill first",
}
WalletUnlockNeeded = btcjson.Error{
Code: -13,
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Message: "Enter the wallet passphrase with walletpassphrase first",
}
WalletPassphraseIncorrect = btcjson.Error{
Code: -14,
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Message: "The wallet passphrase entered was incorrect",
}
WalletWrongEncState = btcjson.Error{
Code: -15,
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Message: "Command given in wrong wallet encryption state",
}
WalletEncryptionFailed = btcjson.Error{
Code: -16,
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Message: "Failed to encrypt the wallet",
}
WalletAlreadyUnlocked = btcjson.Error{
Code: -17,
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Message: "Wallet is already unlocked",
}
)
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var (
// seq holds the btcwallet sequence number for frontend messages
// which must be sent to and received from btcd. A Mutex protects
// against concurrent access.
seq = struct {
sync.Mutex
n uint64
}{}
// replyRouter maps uint64 ids to reply channels, so btcd replies can
// be routed to the correct frontend.
replyRouter = struct {
sync.Mutex
m map[uint64]chan []byte
}{
m: make(map[uint64]chan []byte),
}
)
// ProcessFrontendMsg checks the message sent from a frontend. If the
// message method is one that must be handled by btcwallet, the request
// is processed here. Otherwise, the message is sent to btcd.
func ProcessFrontendMsg(reply chan []byte, msg []byte) {
cmd, err := btcjson.JSONGetMethod(msg)
if err != nil {
log.Error("Unable to parse JSON method from message.")
return
}
switch cmd {
// Standard bitcoind methods
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case "getaddressesbyaccount":
GetAddressesByAccount(reply, msg)
case "getbalance":
GetBalance(reply, msg)
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case "getnewaddress":
GetNewAddress(reply, msg)
case "walletlock":
WalletLock(reply, msg)
case "walletpassphrase":
WalletPassphrase(reply, msg)
// btcwallet extensions
case "createencryptedwallet":
CreateEncryptedWallet(reply, msg)
case "walletislocked":
WalletIsLocked(reply, msg)
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default:
// btcwallet does not understand method. Pass to btcd.
log.Info("Unknown btcwallet method ", cmd)
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seq.Lock()
n := seq.n
seq.n++
seq.Unlock()
var m map[string]interface{}
json.Unmarshal(msg, &m)
m["id"] = fmt.Sprintf("btcwallet(%v)-%v", n, m["id"])
newMsg, err := json.Marshal(m)
if err != nil {
log.Info("Error marshalling json: " + err.Error())
}
replyRouter.Lock()
replyRouter.m[n] = reply
replyRouter.Unlock()
btcdMsgs <- newMsg
}
}
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// ReplyError creates and marshalls a btcjson.Reply with the error e,
// sending the reply to a reply channel.
func ReplyError(reply chan []byte, id interface{}, e *btcjson.Error) {
r := btcjson.Reply{
Error: e,
Id: &id,
}
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if mr, err := json.Marshal(r); err == nil {
reply <- mr
}
}
// ReplySuccess creates and marshalls a btcjson.Reply with the result r,
// sending the reply to a reply channel.
func ReplySuccess(reply chan []byte, id interface{}, result interface{}) {
r := btcjson.Reply{
Result: result,
Id: &id,
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}
if mr, err := json.Marshal(r); err == nil {
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reply <- mr
}
}
// GetAddressesByAccount replies with all addresses for an account.
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func GetAddressesByAccount(reply chan []byte, msg []byte) {
var v map[string]interface{}
json.Unmarshal(msg, &v)
params := v["params"].([]interface{})
var result interface{}
wallets.RLock()
w := wallets.m[params[0].(string)]
wallets.RUnlock()
if w != nil {
result = w.Wallet.GetActiveAddresses()
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} else {
result = []interface{}{}
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}
ReplySuccess(reply, v["id"], result)
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}
// GetBalance replies with the balance for an account (wallet). If
// the requested wallet does not exist, a JSON error will be returned to
// the client.
//
// TODO(jrick): Actually calculate correct balance.
func GetBalance(reply chan []byte, msg []byte) {
var v map[string]interface{}
json.Unmarshal(msg, &v)
params := v["params"].([]interface{})
var wname string
if len(params) > 0 {
if s, ok := params[0].(string); ok {
wname = s
} else {
ReplyError(reply, v["id"], &InvalidParams)
}
}
wallets.RLock()
w := wallets.m[wname]
wallets.RUnlock()
var result interface{}
if w != nil {
result = 0 // TODO(jrick)
ReplySuccess(reply, v["id"], result)
} else {
e := WalletInvalidAccountName
e.Message = fmt.Sprintf("Wallet for account '%s' does not exist.", wname)
ReplyError(reply, v["id"], &e)
}
}
// GetNewAddress gets or generates a new address for an account. If
// the requested wallet does not exist, a JSON error will be returned to
// the client.
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func GetNewAddress(reply chan []byte, msg []byte) {
var v map[string]interface{}
json.Unmarshal(msg, &v)
params := v["params"].([]interface{})
var wname string
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if len(params) == 0 || params[0].(string) == "" {
wname = ""
} else {
wname = "params[0].(string)"
}
wallets.RLock()
w := wallets.m[wname]
wallets.RUnlock()
if w != nil {
// TODO(jrick): generate new addresses if the address pool is empty.
addr := w.NextUnusedAddress()
ReplySuccess(reply, v["id"], addr)
} else {
e := WalletInvalidAccountName
e.Message = fmt.Sprintf("Wallet for account '%s' does not exist.", wname)
ReplyError(reply, v["id"], &e)
}
}
// CreateEncryptedWallet creates a new encrypted wallet. The form of the command is:
//
// createencryptedwallet [account] [description] [passphrase]
//
// All three parameters are required, and must be of type string. If
// the wallet specified by account already exists, an invalid account
// name error is returned to the client.
func CreateEncryptedWallet(reply chan []byte, msg []byte) {
var v map[string]interface{}
json.Unmarshal(msg, &v)
params := v["params"].([]interface{})
var wname string
if len(params) != 3 {
ReplyError(reply, v["id"], &InvalidParams)
return
}
wname, ok1 := params[0].(string)
desc, ok2 := params[1].(string)
pass, ok3 := params[2].(string)
if !ok1 || !ok2 || !ok3 {
ReplyError(reply, v["id"], &InvalidParams)
return
}
// Does this wallet already exist?
wallets.RLock()
if w := wallets.m[wname]; w != nil {
e := WalletInvalidAccountName
e.Message = "Wallet already exists."
ReplyError(reply, v["id"], &e)
return
}
wallets.RUnlock()
w, err := wallet.NewWallet(wname, desc, []byte(pass))
if err != nil {
log.Error("Error creating wallet: " + err.Error())
ReplyError(reply, v["id"], &InternalError)
return
}
wallets.Lock()
wallets.m[wname] = &BtcWallet{
Wallet: w,
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}
wallets.Unlock()
ReplySuccess(reply, v["id"], nil)
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}
// WalletIsLocked returns whether the wallet used by the specified
// account, or default account, is locked.
func WalletIsLocked(reply chan []byte, msg []byte) {
var v map[string]interface{}
json.Unmarshal(msg, &v)
params := v["params"].([]interface{})
account := ""
if len(params) > 0 {
if acct, ok := params[0].(string); ok {
account = acct
} else {
ReplyError(reply, v["id"], &InvalidParams)
return
}
}
wallets.RLock()
w := wallets.m[account]
wallets.RUnlock()
if w != nil {
result := w.IsLocked()
ReplySuccess(reply, v["id"], result)
} else {
ReplyError(reply, v["id"], &WalletInvalidAccountName)
}
}
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// WalletLock locks the wallet.
//
// TODO(jrick): figure out how multiple wallets/accounts will work
// with this.
func WalletLock(reply chan []byte, msg []byte) {
var v map[string]interface{}
json.Unmarshal(msg, &v)
wallets.RLock()
w := wallets.m[""]
wallets.RUnlock()
if w != nil {
if err := w.Lock(); err != nil {
ReplyError(reply, v["id"], &WalletWrongEncState)
} else {
ReplySuccess(reply, v["id"], nil)
NotifyWalletLockStateChange(reply, true)
}
}
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}
// WalletPassphrase stores the decryption key for the default account,
// unlocking the wallet.
//
// TODO(jrick): figure out how multiple wallets/accounts will work
// with this.
func WalletPassphrase(reply chan []byte, msg []byte) {
var v map[string]interface{}
json.Unmarshal(msg, &v)
params := v["params"].([]interface{})
if len(params) != 2 {
ReplyError(reply, v["id"], &InvalidParams)
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return
}
passphrase, ok1 := params[0].(string)
timeout, ok2 := params[1].(float64)
if !ok1 || !ok2 {
ReplyError(reply, v["id"], &InvalidParams)
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return
}
wallets.RLock()
w := wallets.m[""]
wallets.RUnlock()
if w != nil {
if err := w.Unlock([]byte(passphrase)); err != nil {
ReplyError(reply, v["id"], &WalletPassphraseIncorrect)
return
}
ReplySuccess(reply, v["id"], nil)
NotifyWalletLockStateChange(reply, false)
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go func() {
time.Sleep(time.Second * time.Duration(int64(timeout)))
w.Lock()
NotifyWalletLockStateChange(reply, true)
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}()
}
}
// NotifyWalletLockStateChange sends a notification to all frontends
// that the wallet has just been locked or unlocked.
func NotifyWalletLockStateChange(reply chan []byte, locked bool) {
var id interface{} = "btcwallet:newwalletlockstate"
m := btcjson.Reply{
Result: locked,
Id: &id,
}
msg, _ := json.Marshal(&m)
frontendNotificationMaster <- msg
}