118 lines
No EOL
3.6 KiB
JavaScript
118 lines
No EOL
3.6 KiB
JavaScript
const conversion = require("./conversion");
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class Logger {
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/** Logger
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*
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* @param {{
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* output: NodeJS.WritableStream,
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* output2: NodeJS.WritableStream,
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* template: string,
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* levelsColors: {[level: string]: string},
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* historySize: number,
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* onHistoryFull: () => void,
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* argsPlaceholder: string,
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* defaultLevel: string,
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* dict: Map<string, string>,
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* logFrom: 'debug' | 'info' | 'warn' | 'error' | 'fatal'
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* logFrom2: 'debug' | 'info' | 'warn' | 'error' | 'fatal'
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* }} options
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*/
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constructor(options = {})
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{
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this.output = options.output || process.stdout;
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this.output2 = options.output2 || null;
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this.template = options.template || "[{level} {timestamp}] {message}";
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this.levelsColors = options.levelsColors || { // no same colors
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debug: "\x1b[32m",
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info: "\x1b[36m",
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warn: "\x1b[33m",
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"warn;": "\x1b[33m",
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error: "\x1b[31m",
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fatal: "\x1b[35m"
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};
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this.dict = options.dict || null;
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this.argsPlaceholder = options.argsPlaceholder || "{}";
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this.defaultLevel = options.defaultLevel || "info";
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this.history = [];
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this.historySize = options.historySize || 100;
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this.onHistoryFull = options.onHistoryFull || function() {
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this.alog("warn;", "History is full, dropping 25 oldest entries.");
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this.history = this.history.slice(25);
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};
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this.logFrom = options.logFrom ? options.logFrom.charAt(0).toUpperCase() : "D"; // when to stop logging to output
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this.logFrom2 = options.logFrom2 ? options.logFrom2.charAt(0).toUpperCase() : "D"; // when to stop logging to output2
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// Order from least important to most: D, I, W, E, F
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this.logImportance = {
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D: 0, I: 1, W: 2, E: 3, F: 4
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};
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}
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/** log
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*
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* @param {string} message
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* @param {any} ...args
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*
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*/
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log (message, ...args)
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{this.alog(this.defaultLevel, message, ...args);}
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/** alog
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*
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* @param {'debug' | 'info' | 'warn' | 'error' | 'fatal'} level
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* @param {string} message
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* @param {any} ...args
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*
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*/
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async alog(level, message, ...args)
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{
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//replace placeholders with args
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let msg = this.template;
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msg = msg.replace(/\{level\}/g, level.charAt(0).toUpperCase());
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// [I {timestamp}] {message}
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msg = msg.replace(/\{timestamp\}/g, new Date().toISOString());
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// [I 1/1/1970 00:00:00] {message}
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msg = msg.replace(/\{message\}/g, message);
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// [I 1/1/1970 00:00:00] spul {} {}
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//replace placeholders with args
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if (args.length > 0)
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{
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let argPH = this.argsPlaceholder;
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for (let arg of args)
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{
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// detect if arg is an object and convert it to string if it is
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if (typeof arg === "object" || Array.isArray(arg) || arg.constructor === Object)
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arg = JSON.stringify(arg, null, 2);
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msg = msg.replace(argPH, arg);
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}
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}
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//replace dictionary keys
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if (this.dict)
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msg = conversion.dictionaryConversion(msg, this.dict);
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// add color
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let msgNoColors = msg;
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if (this.levelsColors && this.levelsColors[level])
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msg = this.levelsColors[level] + msg + "\x1b[0m";
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//log (if important enough)
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if (this.logImportance[level.charAt(0).toUpperCase()] >= this.logImportance[this.logFrom])
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this.output.write(msg + "\n");
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if (this.output2 && this.logImportance[level.charAt(0).toUpperCase()] >= this.logImportance[this.logFrom2])
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this.output2.write(msgNoColors + "\n");
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//save to history
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this.history.push({
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level: level,
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message: message,
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args: args
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});
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if (this.history.length >= this.historySize && level !== "warn;")
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this.onHistoryFull();
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}
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}
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module.exports = Logger; |