74 lines
2.2 KiB
JavaScript
74 lines
2.2 KiB
JavaScript
var layouts = require('../layouts')
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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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//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 (defaults to basicLayout).
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* @param logSize - the maximum size (in bytes) for a log file, if not provided then logs won't be rotated.
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* @param numBackups - the number of log files to keep after logSize has been reached (default 5)
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*/
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function fileAppender (file, layout, logSize, numBackups) {
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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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);
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} else {
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stream = fs.createWriteStream(file, { encoding: "utf8", mode: 0644, flags: 'a' });
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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) + 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);
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}
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exports.appender = fileAppender;
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exports.configure = configure;
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