242 lines
6.9 KiB
JavaScript
242 lines
6.9 KiB
JavaScript
'use strict';
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var path = require('path');
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var BitcoreNode = require('../node');
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var index = require('../');
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var bitcore = require('bitcore-lib');
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var _ = bitcore.deps._;
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var $ = bitcore.util.preconditions;
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var log = index.log;
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var child_process = require('child_process');
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var fs = require('fs');
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var shuttingDown = false;
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log.debug = function() {};
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/**
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* This function will loop over the configuration for services and require the
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* specified modules, and assemble an array in this format:
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* [
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* {
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* name: 'bitcoind',
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* config: {},
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* module: BitcoinService
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* }
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* ]
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* @param {Function} req - The require function to use
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* @param {Array} servicesPath - The local path (for requiring services)
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* @param {Object} config
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* @param {Array} config.services - An array of strings of service names.
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* @returns {Array}
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*/
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function setupServices(req, servicesPath, config) {
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module.paths.push(path.resolve(servicesPath, './node_modules'));
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var services = [];
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if (config.services) {
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for (var i = 0; i < config.services.length; i++) {
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var service = {};
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service.name = config.services[i];
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var hasConfig = config.servicesConfig && config.servicesConfig[service.name];
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service.config = hasConfig ? config.servicesConfig[service.name] : {};
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try {
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// first try in the built-in bitcore-node services directory
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service.module = req(path.resolve(__dirname, '../services/' + service.name));
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} catch(e) {
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// check if the package.json specifies a specific file to use
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var servicePackage = req(service.name + '/package.json');
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var serviceModule = service.name;
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if (servicePackage.bitcoreNode) {
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serviceModule = service.name + '/' + servicePackage.bitcoreNode;
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}
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service.module = req(serviceModule);
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}
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// check that the service supports expected methods
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if (!service.module.prototype ||
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!service.module.dependencies ||
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!service.module.prototype.start ||
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!service.module.prototype.stop) {
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throw new Error(
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'Could not load service "' + service.name + '" as it does not support necessary methods.'
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);
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}
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services.push(service);
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}
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}
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return services;
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}
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/**
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* Will register event handlers to log the current db sync status.
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* @param {Node} node
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*/
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function registerSyncHandlers(node, delay) {
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delay = delay || 10000;
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var interval = false;
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var count = 0;
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function logSyncStatus() {
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log.info(
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'Database Sync Status: Tip:', node.services.db.tip.hash,
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'Height:', node.services.db.tip.__height,
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'Rate:', count/10, 'blocks per second'
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);
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}
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node.on('ready', function() {
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if (node.services.db) {
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node.on('synced', function() {
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clearInterval(interval);
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logSyncStatus();
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});
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node.services.db.on('addblock', function(block) {
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count++;
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// Initialize logging if not already instantiated
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if (!interval) {
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interval = setInterval(function() {
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logSyncStatus();
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count = 0;
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}, delay);
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}
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});
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}
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});
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node.on('stopping', function() {
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clearInterval(interval);
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});
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}
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/**
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* Will shutdown a node and then the process
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* @param {Object} _process - The Node.js process object
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* @param {Node} node - The Bitcore Node instance
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*/
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function cleanShutdown(_process, node) {
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node.stop(function(err) {
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if(err) {
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log.error('Failed to stop services: ' + err);
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return _process.exit(1);
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}
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log.info('Halted');
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_process.exit(0);
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});
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}
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/**
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* Will register event handlers to stop the node for `process` events
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* `uncaughtException` and `SIGINT`.
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* @param {Object} _process - The Node.js process
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* @param {Node} node
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*/
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function registerExitHandlers(_process, node) {
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//catches uncaught exceptions
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_process.on('uncaughtException', exitHandler.bind(null, {exit:true}, _process, node));
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//catches ctrl+c event
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_process.on('SIGINT', exitHandler.bind(null, {sigint:true}, _process, node));
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}
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/**
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* Will handle all the shutdown tasks that need to take place to ensure a safe exit
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* @param {Object} options
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* @param {String} options.sigint - The signal given was a SIGINT
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* @param {Array} options.exit - The signal given was an uncaughtException
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* @param {Object} _process - The Node.js process
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* @param {Node} node
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* @param {Error} error
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*/
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function exitHandler(options, _process, node, err) {
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if (err) {
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log.error('uncaught exception:', err);
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if(err.stack) {
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log.error(err.stack);
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}
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node.stop(function(err) {
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if(err) {
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log.error('Failed to stop services: ' + err);
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}
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_process.exit(-1);
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});
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}
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if (options.sigint) {
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if (!shuttingDown) {
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shuttingDown = true;
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start.cleanShutdown(_process, node);
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}
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}
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}
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/**
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* This function will instantiate and start a Node, requiring the necessary service
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* modules, and registering event handlers.
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* @param {Object} options
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* @param {Object} options.servicesPath - The path to the location of service modules
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* @param {String} options.path - The absolute path of the configuration file
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* @param {Object} options.config - The parsed bitcore-node.json configuration file
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* @param {Array} options.config.services - An array of services names.
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* @param {Object} options.config.servicesConfig - Parameters to pass to each service
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* @param {String} options.config.datadir - A relative (to options.path) or absolute path to the datadir
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* @param {String} options.config.network - 'livenet', 'testnet' or 'regtest
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* @param {Number} options.config.port - The port to use for the web service
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*/
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function start(options) {
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var fullConfig = _.clone(options.config);
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var servicesPath;
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if (options.servicesPath) {
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servicesPath = options.servicesPath; // services are in a different directory than the config
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} else {
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servicesPath = options.path; // defaults to the same directory
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}
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fullConfig.path = path.resolve(options.path, './bitcore-node.json');
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fullConfig.services = start.setupServices(require, servicesPath, options.config);
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var node = new BitcoreNode(fullConfig);
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// set up the event handlers for logging sync information
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start.registerSyncHandlers(node);
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// setup handlers for uncaught exceptions and ctrl+c
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start.registerExitHandlers(process, node);
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node.on('ready', function() {
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log.info('Bitcore Node ready');
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});
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node.on('error', function(err) {
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log.error(err);
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});
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node.start(function(err) {
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if(err) {
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log.error('Failed to start services');
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if (err.stack) {
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log.error(err.stack);
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}
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start.cleanShutdown(process, node);
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}
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});
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return node;
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}
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module.exports = start;
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module.exports.registerExitHandlers = registerExitHandlers;
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module.exports.exitHandler = exitHandler;
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module.exports.registerSyncHandlers = registerSyncHandlers;
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module.exports.setupServices = setupServices;
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module.exports.cleanShutdown = cleanShutdown;
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