72 lines
2.1 KiB
JavaScript
72 lines
2.1 KiB
JavaScript
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const utils = require('./utils');
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// define max number of logs to keep in memory for this process
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// to prevent runaway memory leak
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const MAX_LOGS = require('../constants').logs.maxLogLength;
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class LogHandler {
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constructor({events, logger, processName, silent}) {
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this.events = events;
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this.logger = logger;
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this.processName = processName;
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this.silent = silent;
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this.logs = [];
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this.removedCount = 0;
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}
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/**
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* Servers as an interception of logs, normalises the message output and
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* adds metadata (timestamp, id) the data,
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* stores the log in memory, then sends it to the logger for output. Max
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* number of logs stored in memory is capped by MAX_LOGS
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* @param {Object} msg Object containing the log message (msg.message)
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*
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* @returns {void}
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*/
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handleLog(msg) {
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if(!msg) return;
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// Sometimes messages come in with line breaks, so we need to break them up accordingly.
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let processedMessages = [];
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// Ensure that `msg.message` is an array, so we process this consistently. Sometimes it
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// is an Array, sometimes it is a string.
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if(typeof msg.message === 'string') {
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processedMessages = [msg.message];
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} else {
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msg.message.forEach(message => {
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let lines = message.split("\n");
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lines.forEach(line => processedMessages.push(line));
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});
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}
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const timestamp = new Date().getTime();
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processedMessages.forEach((message) => {
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const log = {
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msg: message,
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msg_clear: message.stripColors,
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logLevel: msg.logLevel,
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name: this.processName,
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timestamp
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};
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if(this.logs.length >= MAX_LOGS){
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this.logs.shift();
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this.removedCount++;
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}
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const id = this.logs.push(log) - 1 + this.removedCount;
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this.events.emit(`process-log-${this.processName}`, id, log);
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if (this.silent && msg.type !== 'error') {
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return;
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}
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if (this.logger[msg.type]) {
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return this.logger[msg.type](utils.normalizeInput(message));
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}
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this.logger.debug(utils.normalizeInput(message));
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});
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}
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}
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module.exports = LogHandler;
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