node-eventstore-client/src/common/log/fileLogger.js

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var util = require('util');
var fs = require('fs');
var os = require('os');
function FileLogger(filePath, append) {
this._filePath = filePath;
if (!append) {
try {
fs.unlink(filePath);
} catch(e) {}
}
}
function createLine(level, args, argsStartIndex) {
var msg = util.format.apply(util, Array.prototype.slice.call(args, argsStartIndex));
return util.format('%s %s - %s%s', new Date().toISOString(), level, msg, os.EOL);
}
FileLogger.prototype.debug = function() {
var line = createLine('DEBUG', arguments, 0);
fs.appendFileSync(this._filePath, line);
};
FileLogger.prototype.info = function() {
var line = createLine('INFO', arguments, 0);
fs.appendFileSync(this._filePath, line);
};
FileLogger.prototype.error = function(e) {
var hasError = e instanceof Error;
var line = createLine('ERROR', arguments, hasError ? 1 : 0);
if (hasError) {
line += e.stack + os.EOL;
}
fs.appendFileSync(this._filePath, line);
};
module.exports = FileLogger;