Начальная структура директорий, каркас проекта
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Book Pauk
232
server/core/Logger.js
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232
server/core/Logger.js
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/*
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Журналирование с буферизацией вывода
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*/
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const fs = require('fs-extra');
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const ayncExit = new (require('./AsyncExit'))();
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const sleep = (ms) => { return new Promise(resolve => setTimeout(resolve, ms)) };
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global.LM_OK = 0;
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global.LM_INFO = 1;
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global.LM_WARN = 2;
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global.LM_ERR = 3;
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global.LM_FATAL = 4;
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global.LM_TOTAL = 5;
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const LOG_CACHE_BUFFER_SIZE = 8192;
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const LOG_BUFFER_FLUSH_INTERVAL = 200;
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const LOG_ROTATE_FILE_LENGTH = 1000000;
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const LOG_ROTATE_FILE_DEPTH = 9;
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const LOG_ROTATE_FILE_CHECK_INTERVAL = 60000;
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let msgTypeToStr = {
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[LM_OK]: ' OK',
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[LM_INFO]: ' INFO',
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[LM_WARN]: ' WARN',
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[LM_ERR]: 'ERROR',
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[LM_FATAL]: 'FATAL ERROR',
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[LM_TOTAL]: 'TOTAL'
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};
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class BaseLog {
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constructor(params) {
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this.params = params;
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this.exclude = new Set(params.exclude);
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this.outputBufferLength = 0;
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this.outputBuffer = [];
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this.flushing = false;
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}
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async flush() {
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if (this.flushing || !this.outputBufferLength)
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return;
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this.flushing = true;
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this.data = this.outputBuffer;
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this.outputBufferLength = 0;
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this.outputBuffer = [];
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await this.flushImpl(this.data)
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.catch(e => { console.error(`Logger error: ${e}`); ayncExit.exit(1); } );
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this.flushing = false;
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}
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log(msgType, message) {
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if (this.closed)
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return;
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if (!this.exclude.has(msgType)) {
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this.outputBuffer.push(message);
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this.outputBufferLength += message.length;
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if (this.outputBufferLength >= LOG_CACHE_BUFFER_SIZE && !this.flushing) {
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this.flush();
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}
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if (!this.iid) {
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this.iid = setInterval(() => {
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if (!this.flushing) {
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clearInterval(this.iid);
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this.iid = 0;
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this.flush();
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}
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}, LOG_BUFFER_FLUSH_INTERVAL);
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}
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}
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}
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async close() {
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if (this.closed)
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return;
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if (this.iid)
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clearInterval(this.iid);
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try {
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while (this.outputBufferLength) {
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await this.flush();
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await sleep(1);
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}
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} catch(e) {
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console.log(e);
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ayncExit.exit(1);
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}
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this.outputBufferLength = 0;
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this.outputBuffer = [];
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this.closed = true;
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}
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}
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class FileLog extends BaseLog {
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constructor(params) {
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super(params);
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this.fileName = params.fileName;
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this.fd = fs.openSync(this.fileName, 'a');
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this.rcid = 0;
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}
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async close() {
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if (this.closed)
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return;
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await super.close();
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if (this.fd) {
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await fs.close(this.fd);
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this.fd = null;
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}
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if (this.rcid)
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clearTimeout(this.rcid);
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}
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async rotateFile(fileName, i) {
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let fn = fileName;
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if (i > 0)
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fn += `.${i}`;
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let tn = fileName + '.' + (i + 1);
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let exists = await fs.access(tn).then(() => true).catch(() => false);
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if (exists) {
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if (i >= LOG_ROTATE_FILE_DEPTH - 1) {
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await fs.unlink(tn);
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} else {
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await this.rotateFile(fileName, i + 1);
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}
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}
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await fs.rename(fn, tn);
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}
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async doFileRotationIfNeeded() {
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this.rcid = 0;
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let stat = await fs.fstat(this.fd);
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if (stat.size > LOG_ROTATE_FILE_LENGTH) {
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await fs.close(this.fd);
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await this.rotateFile(this.fileName, 0);
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this.fd = await fs.open(this.fileName, "a");
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}
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}
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async flushImpl(data) {
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if (this.closed)
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return;
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if (!this.rcid) {
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await this.doFileRotationIfNeeded();
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this.rcid = setTimeout(() => {
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this.rcid = 0;
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}, LOG_ROTATE_FILE_CHECK_INTERVAL);
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}
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if (this.fd)
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await fs.write(this.fd, Buffer.from(data.join('')));
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}
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}
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class ConsoleLog extends BaseLog {
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async flushImpl(data) {
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process.stdout.write(data.join(''));
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}
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}
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//------------------------------------------------------------------
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const factory = {
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ConsoleLog,
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FileLog,
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};
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class Logger {
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constructor(params = null) {
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this.handlers = [];
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if (params) {
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params.forEach((logParams) => {
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let className = logParams.log;
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let loggerClass = factory[className];
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this.handlers.push(new loggerClass(logParams));
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});
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}
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this.closed = false;
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ayncExit.onSignal((signal, err) => {
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this.log(LM_FATAL, `Signal "${signal}" received, error: "${(err.stack ? err.stack : err)}", exiting...`);
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});
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ayncExit.addAfter(this.close.bind(this));
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}
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formatDate(date) {
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return `${date.getFullYear()}-${(date.getMonth() + 1).toString().padStart(2, '0')}-${date.getDate().toString().padStart(2, '0')} ` +
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`${date.getHours().toString().padStart(2, '0')}:${date.getMinutes().toString().padStart(2, '0')}:${date.getSeconds().toString().padStart(2, '0')}.` +
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`${date.getMilliseconds().toString().padStart(3, '0')}`;
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}
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prepareMessage(msgType, message) {
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return this.formatDate(new Date()) + ` ${msgTypeToStr[msgType]}: ${message}\n`;
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}
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log(msgType, message) {
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if (message == null) {
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message = msgType;
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msgType = LM_INFO;
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}
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const mes = this.prepareMessage(msgType, message);
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if (!this.closed) {
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for (let i = 0; i < this.handlers.length; i++)
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this.handlers[i].log(msgType, mes);
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} else {
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console.log(mes);
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}
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return mes;
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}
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async close() {
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for (let i = 0; i < this.handlers.length; i++)
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await this.handlers[i].close();
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this.closed = true;
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}
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}
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module.exports = Logger;
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