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logger.ts
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// Copyright (c) 2016, Compiler Explorer Authors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
import os from 'node:os';
import {Writable} from 'node:stream';
import {LEVEL, MESSAGE} from 'triple-beam';
import winston from 'winston';
import LokiTransport from 'winston-loki';
// @ts-ignore
import {Papertrail} from 'winston-papertrail';
import TransportStream, {TransportStreamOptions} from 'winston-transport';
const consoleTransportInstance = new winston.transports.Console();
export const logger = winston.createLogger({
format: winston.format.combine(
process.stdout.isTTY ? winston.format.colorize() : winston.format.uncolorize(),
winston.format.splat(),
winston.format.simple(),
),
transports: [consoleTransportInstance],
});
// Creates a log stream, suitable to passing to something that writes complete lines of output to a stream, for example
// morgan's http logger. We look for complete text lines and output each as a winston log entry.
export function makeLogStream(level: string, logger_: winston.Logger = logger): {write: (chunk: string) => void} {
let buffer = '';
return new Writable({
write: (chunk: string, encoding, callback: () => void) => {
buffer += chunk;
while (buffer.length > 0) {
const eol = buffer.indexOf('\n');
if (eol < 0) break;
logger_.log(level, buffer.substring(0, eol));
buffer = buffer.substring(eol + 1);
}
callback();
},
});
}
type MyPapertrailTransportOptions = TransportStreamOptions & {
host: string;
port: number;
identifier: string;
hostnameForLogging?: string;
format?: winston.Logform.Format;
};
// Our own transport which uses Papertrail under the hood but better adapts it to work in winston 3.0
class MyPapertrailTransport extends TransportStream {
private readonly hostname: string;
private readonly program: string;
public readonly transport: Papertrail;
constructor(opts: MyPapertrailTransportOptions) {
super(opts);
this.program = opts.identifier;
if (opts.hostnameForLogging) {
this.hostname = opts.hostnameForLogging;
} else {
this.hostname = os.hostname();
}
this.transport = new Papertrail({
host: opts.host,
port: opts.port,
logFormat: (level: any, message: any) => message,
hostname: this.hostname,
format: opts.format,
});
}
override log(info: any, callback: () => void) {
setImmediate(() => {
this.emit('logged', info);
6595
});
// We can't use callback here as winston-papertrail is a bit lax in calling it back
this.transport.sendMessage(this.hostname, this.program, info[LEVEL], info[MESSAGE], (x: any) => x);
callback();
}
}
export function logToLoki(url: string) {
const transport = new LokiTransport({
host: url,
labels: {job: 'ce'},
batching: true,
interval: 3,
// remove color from log level label - loki really doesn't like it
format: winston.format.uncolorize({
message: false,
raw: false,
}),
});
logger.add(transport);
logger.info('Configured loki');
}
export function logToPapertrail(host: string, port: number, identifier: string, hostnameForLogging?: string) {
const settings: MyPapertrailTransportOptions = {
host: host,
port: port,
identifier: identifier,
hostnameForLogging,
format: winston.format.combine(winston.format.colorize(), winston.format.splat(), winston.format.simple()),
};
const transport = new MyPapertrailTransport(settings);
transport.transport.on('error', (err: any) => {
logger.error(err);
});
transport.transport.on('connect', (message: any) => {
logger.info(message);
});
logger.add(transport);
logger.info('Configured papertrail');
}
class Blackhole extends TransportStream {
override log(info: any, callback: () => void) {
callback();
}
}
export function suppressConsoleLog() {
logger.remove(consoleTransportInstance);
logger.add(new Blackhole());
}