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423
db-async.js
423
db-async.js
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@ -9,251 +9,250 @@ const allEvents = new Set([
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const fks = new Set();
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module.exports = class DbAsync {
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constructor(config) {
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this.config = config;
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this.running = false;
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this.filename = null;
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this.position = null;
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this.schemaMap = new Map();
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}
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constructor(config) {
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this.config = config;
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this.running = false;
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this.filename = null;
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this.position = null;
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this.schemaMap = new Map();
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}
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async start() {
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if (this.config.testMode)
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console.debug('Test mode enabled, just logging queries to console.');
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async start() {
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if (this.config.testMode)
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console.debug('Test mode enabled, just logging queries to console.');
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console.log('Starting process.');
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console.log('Starting process.');
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const db = await mysql.createConnection(this.config.db);
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this.db = db;
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const db = await mysql.createConnection(this.config.db);
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this.db = db;
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const includeSchema = {};
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for (const schemaName in this.config.includeSchema) {
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const schema = this.config.includeSchema[schemaName];
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const tables = [];
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const tableMap = new Map();
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const includeSchema = {};
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for (const schemaName in this.config.includeSchema) {
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const schema = this.config.includeSchema[schemaName];
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const tables = [];
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const tableMap = new Map();
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for (const tableName in schema) {
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const table = schema[tableName];
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tables.push(tableName);
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for (const tableName in schema) {
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const table = schema[tableName];
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tables.push(tableName);
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const tableInfo = {
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events: allEvents,
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columns: true,
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fk: 'id'
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};
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tableMap.set(tableName, tableInfo);
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const tableInfo = {
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events: allEvents,
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columns: true,
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fk: 'id'
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};
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tableMap.set(tableName, tableInfo);
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if (typeof table === 'object') {
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if (Array.isArray(table.events))
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tableInfo.events = new Set(table.events);
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if (Array.isArray(table.columns))
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tableInfo.columns = new Set(table.columns);
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if (table.fk)
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tableInfo.fk = table.fk;
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}
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if (typeof table === 'object') {
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if (Array.isArray(table.events))
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tableInfo.events = new Set(table.events);
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if (Array.isArray(table.columns))
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tableInfo.columns = new Set(table.columns);
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if (table.fk)
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tableInfo.fk = table.fk;
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}
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includeSchema[schemaName] = tables;
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this.schemaMap.set(schemaName, tableMap);
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}
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const opts = {
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includeEvents: this.config.includeEvents,
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includeSchema
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};
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this.opts = opts;
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const [res] = await this.db.query(
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'SELECT `logName`, `position` FROM `binlogQueue` WHERE code = ?',
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[this.config.queue]
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);
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if (res.length) {
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const [row] = res;
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this.filename = row.logName;
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this.position = row.position;
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Object.assign(opts, {
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filename: this.filename,
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position: this.position
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});
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} else
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opts.startAtEnd = true;
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await this.startZongji();
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includeSchema[schemaName] = tables;
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this.schemaMap.set(schemaName, tableMap);
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}
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async stop() {
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await this.stopZongji();
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await this.db.end();
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const opts = {
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includeEvents: this.config.includeEvents,
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includeSchema
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};
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this.opts = opts;
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const [res] = await this.db.query(
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'SELECT `logName`, `position` FROM `binlogQueue` WHERE code = ?',
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[this.config.queue]
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);
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if (res.length) {
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const [row] = res;
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this.filename = row.logName;
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this.position = row.position;
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Object.assign(opts, {
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filename: this.filename,
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position: this.position
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});
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} else
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opts.startAtEnd = true;
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await this.startZongji();
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}
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async stop() {
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await this.stopZongji();
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await this.db.end();
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}
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async startZongji() {
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const zongji = new ZongJi(this.config.db);
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this.zongji = zongji;
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zongji.on('ready', () => this.onReady());
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zongji.on('stopped', () => this.onStopped());
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zongji.on('error', err => this.onError(err));
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zongji.on('binlog', evt => this.onBinlog(evt));
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zongji.start(this.opts);
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}
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async stopZongji() {
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console.debug('Stopping Zongji.');
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this.running = false;
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clearInterval(this.flushInterval);
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clearInterval(this.pingInterval);
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this.zongji.stop();
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}
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async restartZongji() {
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console.debug('Restaring Zongji.');
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await this.stopZongji();
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setTimeout(() => this.startZongji(this.opts), 1000);
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}
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onReady() {
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this.running = true;
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this.flushInterval = setInterval(
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() => this.flushQueue(), this.config.flushInterval);
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this.pingInterval = setInterval(
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() => this.connectionPing(), this.config.pingInterval * 1000);
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console.debug('Zongji ready.');
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}
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onStopped() {
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console.debug('Zongji stopped.');
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}
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async onError(err) {
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console.log(`Error: ${err.code}: ${err.message}`);
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switch (err.code) {
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case 'PROTOCOL_CONNECTION_LOST':
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case 'ECONNRESET':
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await this.restartZongji();
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break;
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default:
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await this.stop();
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process.exit();
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}
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}
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onBinlog(evt) {
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//evt.dump();
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const eventName = evt.getEventName();
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if (eventName === 'tablemap') return;
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if (eventName === 'rotate') {
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this.filename = evt.binlogName;
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this.position = evt.position;
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console.log(`[${eventName}] filename: ${this.filename}`, `position: ${this.position}`);
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return;
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}
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async startZongji() {
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const zongji = new ZongJi(this.config.db);
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this.zongji = zongji;
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const table = evt.tableMap[evt.tableId];
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const tableMap = this.schemaMap.get(table.parentSchema);
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if (!tableMap) return;
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zongji.on('ready', () => this.onReady());
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zongji.on('stopped', () => this.onStopped());
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zongji.on('error', err => this.onError(err));
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zongji.on('binlog', evt => this.onBinlog(evt));
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zongji.start(this.opts);
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}
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const tableInfo = tableMap.get(table.tableName);
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if (!tableInfo) return;
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async stopZongji() {
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console.debug('Stopping Zongji.');
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this.running = false;
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clearInterval(this.flushInterval);
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clearInterval(this.pingInterval);
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this.zongji.stop();
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}
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if (!tableInfo.events.has(eventName)) return;
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async restartZongji() {
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console.debug('Restaring Zongji.');
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await this.stopZongji();
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setTimeout(() => this.startZongji(this.opts), 1000);
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}
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let column;
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const rows = evt.rows;
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onReady() {
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this.running = true;
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this.flushInterval = setInterval(
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() => this.flushQueue(), this.config.flushInterval);
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this.pingInterval = setInterval(
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() => this.connectionPing(), this.config.pingInterval * 1000);
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console.debug('Zongji ready.');
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}
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onStopped() {
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console.debug('Zongji stopped.');
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}
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async onError(err) {
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console.log(`Error: ${err.code}: ${err.message}`);
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switch (err.code) {
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case 'PROTOCOL_CONNECTION_LOST':
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case 'ECONNRESET':
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await this.restartZongji();
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break;
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default:
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await this.stop();
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process.exit();
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}
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}
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onBinlog(evt) {
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//evt.dump();
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const eventName = evt.getEventName();
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if (eventName === 'tablemap') return;
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if (eventName === 'rotate') {
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this.filename = evt.binlogName;
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this.position = evt.position;
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console.log(`[${eventName}] filename: ${this.filename}`, `position: ${this.position}`);
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return;
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}
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const table = evt.tableMap[evt.tableId];
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const tableMap = this.schemaMap.get(table.parentSchema);
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if (!tableMap) return;
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const tableInfo = tableMap.get(table.tableName);
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if (!tableInfo) return;
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if (!tableInfo.events.has(eventName)) return;
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let column;
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const rows = evt.rows;
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if (eventName === 'updaterows') {
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if (tableInfo.columns !== true) {
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let changes = false;
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for (const row of rows) {
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const after = row.after;
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for (const col in after) {
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if (tableInfo.columns.has(col) && !equals(after[col], row.before[col])) {
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fks.add(after[tableInfo.fk]);
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changes = true;
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if (!column) column = col;
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break;
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}
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if (eventName === 'updaterows') {
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if (tableInfo.columns !== true) {
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let changes = false;
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for (const row of rows) {
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const after = row.after;
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for (const col in after) {
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if (tableInfo.columns.has(col) && !equals(after[col], row.before[col])) {
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fks.add(after[tableInfo.fk]);
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changes = true;
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if (!column) column = col;
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break;
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}
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}
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if (!changes) return;
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} else {
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for (const row of rows)
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fks.add(row.after[tableInfo.fk]);
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}
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if (!changes) return;
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} else {
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for (const row of rows)
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fks.add(row[tableInfo.fk]);
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fks.add(row.after[tableInfo.fk]);
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}
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const row = eventName === 'updaterows'
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? rows[0].after
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: rows[0];
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if (this.config.debug) {
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console.debug(`[${eventName}] ${table.tableName}: ${rows.length}`);
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console.debug(` ${tableInfo.fk}: ${row[tableInfo.fk]}`);
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if (column) {
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let before = formatValue(rows[0].before[column]);
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let after = formatValue(rows[0].after[column]);
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console.debug(` ${column}: ${before} <- ${after}`);
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}
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}
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this.position = evt.nextPosition;
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} else {
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for (const row of rows)
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fks.add(row[tableInfo.fk]);
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}
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async flushQueue() {
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if (!this.running) return;
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console.log('==========================================================');
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console.log('Flush:', `filename: ${this.filename}`, `position: ${this.position}`);
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console.log(fks);
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if (!fks.size) return;
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const row = eventName === 'updaterows'
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? rows[0].after
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: rows[0];
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const ids = [];
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for (const fk of fks) ids.push([fk]);
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const replaceQuery =
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'REPLACE INTO `binlogQueue` SET `code` = ?, `logName` = ?, `position` = ?';
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if (this.config.testMode) {
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console.debug(this.config.addQuery);
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console.debug(replaceQuery);
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} else {
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await this.db.query(this.config.addQuery, [ids]);
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await this.db.query(replaceQuery, [this.config.queue, this.filename, this.position]);
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if (this.config.debug) {
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console.debug(`[${eventName}] ${table.tableName}: ${rows.length}`);
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console.debug(` ${tableInfo.fk}: ${row[tableInfo.fk]}`);
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if (column) {
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let before = formatValue(rows[0].before[column]);
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let after = formatValue(rows[0].after[column]);
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console.debug(` ${column}: ${before} <- ${after}`);
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}
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fks.clear();
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console.log('==========================================================');
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}
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async connectionPing() {
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if (!this.running) return;
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if (this.config.debug)
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console.debug('Sending ping to database.')
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this.zongji.connection.ping();
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this.zongji.ctrlConnection.ping();
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await this.db.ping();
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}
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this.position = evt.nextPosition;
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}
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function equals(a, b) {
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if (a === b)
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return true;
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const type = typeof a;
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if (a == null || b == null || type !== typeof b)
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return false;
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if (type === 'object' && a.constructor === b.constructor) {
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if (a instanceof Date)
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return a.getTime() === b.getTime();
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async flushQueue() {
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if (!this.running) return;
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console.log('==========================================================');
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console.log('Flush:', `filename: ${this.filename}`, `position: ${this.position}`);
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console.log(fks);
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if (!fks.size) return;
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const ids = [];
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for (const fk of fks) ids.push([fk]);
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const replaceQuery =
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'REPLACE INTO `binlogQueue` SET `code` = ?, `logName` = ?, `position` = ?';
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if (this.config.testMode) {
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console.debug(this.config.addQuery);
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console.debug(replaceQuery);
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} else {
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await this.db.query(this.config.addQuery, [ids]);
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await this.db.query(replaceQuery, [this.config.queue, this.filename, this.position]);
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}
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fks.clear();
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console.log('==========================================================');
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}
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async connectionPing() {
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if (!this.running) return;
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if (this.config.debug)
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console.debug('Sending ping to database.')
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this.zongji.connection.ping();
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this.zongji.ctrlConnection.ping();
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await this.db.ping();
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}
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}
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function equals(a, b) {
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if (a === b)
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return true;
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const type = typeof a;
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if (a == null || b == null || type !== typeof b)
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return false;
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if (type === 'object' && a.constructor === b.constructor) {
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if (a instanceof Date)
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return a.getTime() === b.getTime();
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}
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return false;
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}
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function formatValue(value) {
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if (value instanceof Date)
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return value.toJSON();
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return value;
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}
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function formatValue(value) {
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if (value instanceof Date)
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return value.toJSON();
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return value;
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}
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