file-tailrolling-test.js
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var assert = require('assert'),
fs = require('fs'),
path = require('path'),
vows = require('vows'),
winston = require('../../lib/winston'),
helpers = require('../helpers');
var maxfilesTransport = new winston.transports.File({
timestamp: false,
json: false,
filename: path.join(__dirname, '..', 'fixtures', 'logs', 'testtailrollingfiles.log'),
maxsize: 4096,
maxFiles: 3,
tailable: true
});
process.on('uncaughtException', function (err) {
console.log('caught exception');
console.error(err);
});
vows.describe('winston/transports/file/tailrolling').addBatch({
"An instance of the File Transport": {
"when delete old test files": {
topic: function () {
var logs = path.join(__dirname, '..', 'fixtures', 'logs');
fs.readdirSync(logs).forEach(function (file) {
if (~file.indexOf('testtailrollingfiles')) {
fs.unlinkSync(path.join(logs, file));
}
});
this.callback();
},
"and when passed more files than the maxFiles": {
topic: function () {
var that = this,
created = 0;
function data(ch) {
return new Array(1018).join(String.fromCharCode(65 + ch));
};
function logKbytes(kbytes, txt) {
//
// With no timestamp and at the info level,
// winston adds exactly 7 characters:
// [info](4)[ :](2)[\n](1)
//
for (var i = 0; i < kbytes; i++) {
maxfilesTransport.log('info', data(txt), null, function () { });
}
}
maxfilesTransport.on('logged', function () {
if (++created == 4) {
return that.callback();
}
logKbytes(4, created);
});
logKbytes(4, created);
},
"should be 3 log files, base to maxFiles - 1": function () {
var file, fullpath;
for (var num = 0; num < 4; num++) {
file = !num ? 'testtailrollingfiles.log' : 'testtailrollingfiles' + num + '.log';
fullpath = path.join(__dirname, '..', 'fixtures', 'logs', file);
if (num == 3) {
return assert.ok(!fs.existsSync(fullpath));
}
assert.ok(fs.existsSync(fullpath));
}
return false;
},
"should have files in correct order": function () {
var file, fullpath, content;
['D', 'C', 'B'].forEach(function (letter, i) {
file = !i ? 'testtailrollingfiles.log' : 'testtailrollingfiles' + i + '.log';
content = fs.readFileSync(path.join(__dirname, '..', 'fixtures', 'logs', file), 'ascii');
assert.lengthOf(content.match(new RegExp(letter, 'g')), 4068);
});
}
}
}
}
}).export(module);