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90 lines
2.2 KiB
90 lines
2.2 KiB
/*!
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* lib/bitcoind_rpc/rpc-client.js
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* Copyright © 2019 – Katana Cryptographic Ltd. All Rights Reserved.
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*/
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'use strict'
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const rpc = require('bitcoind-rpc-client')
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const network = require('../bitcoin/network')
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const keys = require('../../keys')[network.key]
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const util = require('../util')
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const Logger = require('../logger')
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/**
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* Wrapper for bitcoind rpc client
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*/
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class RpcClient {
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/**
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* Constructor
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*/
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constructor() {
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// Initiliaze the rpc client
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this.client = new rpc({
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host: keys.bitcoind.rpc.host,
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port: keys.bitcoind.rpc.port
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})
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this.client.set('user', keys.bitcoind.rpc.user)
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this.client.set('pass', keys.bitcoind.rpc.pass)
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// Initialize a proxy postprocessing api calls
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return new Proxy(this, {
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get: function(target, name, receiver) {
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const origMethod = target.client[name]
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return async function(...args) {
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const result = await origMethod.apply(target.client, args)
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if (Array.isArray(result)) {
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return result
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} else if (result.result) {
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return result.result
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} else if (result.error) {
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throw result.error
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} else {
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throw 'A problem was met with a request sent to bitcoind RPC API'
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}
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}
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}
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})
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}
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/**
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* Check if an error returned by bitcoin-rpc-client
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* is a connection error.
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* @param {string} err - error message
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* @returns {boolean} returns true if message related to a connection error
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*/
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static isConnectionError(err) {
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if (typeof err != 'string')
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return false
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const isTimeoutError = (err.indexOf('connect ETIMEDOUT') != -1)
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const isConnRejected = (err.indexOf('Connection Rejected') != -1)
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return (isTimeoutError || isConnRejected)
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}
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/**
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* Check if the rpc api is ready to process requests
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* @returns {Promise}
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*/
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static async waitForBitcoindRpcApi() {
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let client = new RpcClient()
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try {
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await client.getblockchaininfo()
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} catch(e) {
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client = null
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Logger.info('Bitcoind RPC API is still unreachable. New attempt in 20s.')
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return util.delay(20000).then(() => {
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return RpcClient.waitForBitcoindRpcApi()
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})
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}
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}
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}
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module.exports = RpcClient
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