generalize bitcoind json-rpc

lib/plugins/wallet/litecoind/litecoind.js

@@ -0,0 +1,113 @@
+const jsonRpc = require('../../common/json-rpc')
+
+const path = require('path')
+const options = require('../../../options')
+
+const BN = require('../../../bn')
+const E = require('../../../error')
+
+const DEFAULT_PORT = 9332
+const SATOSHI_SHIFT = 8
+
+const configPath = path.resolve(options.blockchainDir, 'litecoin.conf')
+const config = jsonRpc.parseConf(configPath)
+
+const rpcConfig = {
+  username: config.rpcuser,
+  password: config.rpcpassword,
+  port: config.rpcport || DEFAULT_PORT
+}
+
+function fetch (method, params) {
+  return jsonRpc.fetch(rpcConfig, method, params)
+}
+
+function checkCryptoCode (cryptoCode) {
+  if (cryptoCode !== 'LTC') return Promise.reject(new Error('Unsupported crypto: ' + cryptoCode))
+  return Promise.resolve()
+}
+
+function accountBalance (acount, cryptoCode, confirmations) {
+  return checkCryptoCode(cryptoCode)
+  .then(() => fetch('getbalance', ['', confirmations]))
+  .then(r => BN(r).shift(SATOSHI_SHIFT).round())
+}
+
+// We want a balance that includes all spends (0 conf) but only deposits that
+// have at least 1 confirmation. getbalance does this for us automatically.
+function balance (account, cryptoCode) {
+  return accountBalance(account, cryptoCode, 1)
+}
+
+function sendCoins (account, address, cryptoAtoms, cryptoCode) {
+  const confirmations = 1
+  const bitcoins = cryptoAtoms.shift(-SATOSHI_SHIFT).toFixed(8)
+
+  return checkCryptoCode(cryptoCode)
+  .then(() => fetch('sendfrom', [address, bitcoins, confirmations]))
+  .catch(err => {
+    if (err.code === -6) throw new E.InsufficientFundsError()
+    throw err
+  })
+}
+
+function newAddress (account, info) {
+  return checkCryptoCode(info.cryptoCode)
+  .then(() => fetch('getnewaddress'))
+}
+
+function addressBalance (address, confs) {
+  return fetch('getreceivedbyaddress', [address, confs])
+  .then(r => BN(r).shift(SATOSHI_SHIFT).round())
+}
+
+function confirmedBalance (address, cryptoCode) {
+  return checkCryptoCode(cryptoCode)
+  .then(() => addressBalance(address, 1))
+}
+
+function pendingBalance (address, cryptoCode) {
+  return checkCryptoCode(cryptoCode)
+  .then(() => addressBalance(address, 0))
+}
+
+function getStatus (account, toAddress, requested, cryptoCode) {
+  return checkCryptoCode(cryptoCode)
+  .then(() => confirmedBalance(toAddress, cryptoCode))
+  .then(confirmed => {
+    if (confirmed.gte(requested)) return {status: 'confirmed'}
+
+    return pendingBalance(toAddress, cryptoCode)
+    .then(pending => {
+      if (pending.gte(requested)) return {status: 'authorized'}
+      if (pending.gt(0)) return {status: 'insufficientFunds'}
+      return {status: 'notSeen'}
+    })
+  })
+}
+
+function newFunding (account, cryptoCode) {
+  return checkCryptoCode(cryptoCode)
+  .then(() => {
+    const promises = [
+      accountBalance(account, cryptoCode, 0),
+      accountBalance(account, cryptoCode, 1),
+      newAddress(account, {cryptoCode})
+    ]
+
+    return Promise.all(promises)
+  })
+  .then(([fundingPendingBalance, fundingConfirmedBalance, fundingAddress]) => ({
+    fundingPendingBalance,
+    fundingConfirmedBalance,
+    fundingAddress
+  }))
+}
+
+module.exports = {
+  balance,
+  sendCoins,
+  newAddress,
+  getStatus,
+  newFunding
+}