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'use strict';
const Fs = require('fs');
const Utilities = require('../utilities');
/**
* Logger for files.
*
* @memberof Loggers
* @implements ILogger
* @class File
*/
module.exports = class FileLogger {
constructor(config) {
/**
* Path to the file it will write to, must be readable.
*
* @name file
* @instance
* @memberof Loggers.File
* @type string
* @default null
*/
this.file = null;
/**
* The formatter it will use to output the log. If not present it
* will output raw JSON
*
* @name formatter
* @instance
* @memberof Loggers.File
* @type IFormatter
* @default null
*/
this.formatter = null;
Object.assign(this, config);
this._stream = Fs.createWriteStream(this.file, { flags: 'a' });
}
/**
* Main entry point, for each incoming argument it will attempt to
* format and send to the stream to be written.
*
* @function log
* @instance
* @memberof Loggers.File
* @return {undefined}
*/
log(...logs) {
for (const log of logs) {
this._stream.write(this._format(log) + '\n');
}
}
_format(logObject) {
if (this.formatter) {
return this.formatter.format(logObject);
}
return Utilities.stringify(logObject);
}
};
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