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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
exports.id = "logger";
const winston = require("winston");
const { format } = winston;
const { combine } = format;
// New prototype method for string to prepend and postfix color
// escape control sequences for writing colors to the console.
String.prototype.color = function (color) {
return `${color}${this}\x1b[0m`;
};
class logger {
constructor() {
this.level = process.env.LOG_LEVEL || "info";
this.levels = {
error: 0,
warn: 1,
info: 2,
http: 3,
verbose: 4,
debug: 5,
silly: 6
};
this.logger = winston.createLogger({
levels: this.levels,
level: this.level,
format: combine(format.colorize(), format.align(), format.simple()),
defaultMeta: { service: "user-service" },
exitOnError: false,
transports: [new winston.transports.Console()]
});
this.logger.log("info", `Log verbosity set to ${this.level.color("\x1b[38;2;241;241;0m")}`);
}
// Generate a unique color based on the uuid.
getUuidColor(uuid) {
let uuidInt = parseInt(uuid, 16);
if (isNaN(uuidInt))
return `\x1b[38;5;202m`;
else
return `\x1b[38;5;${Math.max(uuidInt % 231, 8)}m`;
}
// Log a message to the console. UUID, if passed, will be assigned a unique color.
// level defaults to "info" if not set. Level may be set to numeric or string
// RFC5424 standards:
// error: 0,
// warn: 1,
// info: 2,
// http: 3,
// verbose: 4,
// debug: 5,
// silly: 6
log(message, level, uuid) {
if (!uuid)
uuid = "SYSTEM";
if (!level)
level = "info";
let color = this.getUuidColor(uuid);
this.logger.log(level, `${uuid.slice(0, 8).color(color)} ${message}`);
}
}
module.exports = logger;
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