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logging.test.js
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logging.test.js
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/*
* Copyright Elasticsearch B.V. and other contributors where applicable.
* Licensed under the BSD 2-Clause License; you may not use this file except in
* compliance with the BSD 2-Clause License.
*/
'use strict';
const pino = require('pino');
const test = require('tape');
const logging = require('../lib/logging');
test('default logLevel is "info"', function (t) {
const log = logging.createLogger();
t.equal(log.level, 'info');
t.end();
});
test('simple custom logger works', function (t) {
class SimpleCustomLogger {
constructor() {
this.records = [];
}
_log(level, message) {
this.records.push({ level, message });
}
fatal(message) {
this._log('fatal', message);
}
error(message) {
this._log('error', message);
}
warn(message) {
this._log('warn', message);
}
info(message) {
this._log('info', message);
}
debug(message) {
this._log('debug', message);
}
trace(message) {
this._log('trace', message);
}
}
const customLogger = new SimpleCustomLogger();
const log = logging.createLogger(null, customLogger);
// Note that we expect this `metadatum` to *not* get through to the
// custom logger.
log.info({ metadatum: 42 }, 'testing %d %j %o...', 1, 2, 3);
t.equal(customLogger.records.length, 1);
const rec = customLogger.records[0];
t.equal(rec.level, 'info');
t.equal(rec.message, 'testing 1 2 3...');
t.end();
});
test('pino custom logger gets structured fields', function (t) {
// Use a custom destination for our pino logger to capture writes, so we
// can test the output.
const captureStream = {
chunks: [],
write(chunk) {
this.chunks.push(chunk);
},
getRecords() {
const lines = this.chunks.join('').trim().split(/\n/g);
return lines.map(JSON.parse);
},
};
const customLogger = pino({}, captureStream);
const log = logging.createLogger(null, customLogger);
log.info({ metadatum: 42 }, 'testing %d %j %o...', 1, 2, 3);
log.warn({ err: new Error('boom') }, 'got an error');
const recs = captureStream.getRecords();
t.equal(recs.length, 2);
t.equal(recs[0].level, 30); // pino's levelVal for "info"
t.equal(recs[0].msg, 'testing 1 2 3...');
t.equal(
recs[0].metadatum,
42,
'custom pino logger got structured "metadatum" log field',
);
t.equal(recs[1].level, 40); // pino's levelVal for "warn"
t.equal(
recs[1].err.type,
'Error',
'custom pino logger got structured err.type',
);
t.equal(
recs[1].err.message,
'boom',
'custom pino logger got structured err.message',
);
t.ok(recs[1].err.stack, 'custom pino logger got structured err.stack');
t.end();
});