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102 lines
2.8 KiB
102 lines
2.8 KiB
"use strict";
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var layouts = require('../layouts')
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, async = require('async')
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, path = require('path')
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, fs = require('fs')
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, streams = require('../streams')
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, os = require('os')
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, eol = os.EOL || '\n'
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, openFiles = []
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, levels = require('../levels');
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//close open files on process exit.
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process.on('exit', function() {
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openFiles.forEach(function (file) {
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file.end();
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});
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});
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/**
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* File Appender writing the logs to a text file. Supports rolling of logs by size.
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*
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* @param file file log messages will be written to
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* @param layout a function that takes a logevent and returns a string
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* (defaults to basicLayout).
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* @param logSize - the maximum size (in bytes) for a log file,
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* if not provided then logs won't be rotated.
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* @param numBackups - the number of log files to keep after logSize
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* has been reached (default 5)
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* @param compress - flag that controls log file compression
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* @param timezoneOffset - optional timezone offset in minutes (default system local)
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*/
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function fileAppender (file, layout, logSize, numBackups, compress, timezoneOffset) {
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var bytesWritten = 0;
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file = path.normalize(file);
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layout = layout || layouts.basicLayout;
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numBackups = numBackups === undefined ? 5 : numBackups;
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//there has to be at least one backup if logSize has been specified
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numBackups = numBackups === 0 ? 1 : numBackups;
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function openTheStream(file, fileSize, numFiles) {
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var stream;
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if (fileSize) {
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stream = new streams.RollingFileStream(
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file,
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fileSize,
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numFiles,
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{ "compress": compress }
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);
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} else {
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stream = fs.createWriteStream(
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file,
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{ encoding: "utf8",
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mode: parseInt('0644', 8),
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flags: 'a' }
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);
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}
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stream.on("error", function (err) {
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console.error("log4js.fileAppender - Writing to file %s, error happened ", file, err);
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});
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return stream;
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}
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var logFile = openTheStream(file, logSize, numBackups);
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// push file to the stack of open handlers
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openFiles.push(logFile);
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return function(loggingEvent) {
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logFile.write(layout(loggingEvent, timezoneOffset) + eol, "utf8");
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};
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}
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function configure(config, options) {
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var layout;
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if (config.layout) {
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layout = layouts.layout(config.layout.type, config.layout);
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}
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if (options && options.cwd && !config.absolute) {
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config.filename = path.join(options.cwd, config.filename);
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}
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return fileAppender(config.filename, layout, config.maxLogSize, config.backups, config.compress, config.timezoneOffset);
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}
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function shutdown(cb) {
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async.each(openFiles, function(file, done) {
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if (!file.write(eol, "utf-8")) {
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file.once('drain', function() {
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file.end(done);
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});
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} else {
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file.end(done);
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}
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}, cb);
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}
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exports.appender = fileAppender;
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exports.configure = configure;
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exports.shutdown = shutdown;
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