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96 lines
2.8 KiB
96 lines
2.8 KiB
"use strict";
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var BaseRollingFileStream = require('./BaseRollingFileStream')
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, debug = require('../debug')('DateRollingFileStream')
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, format = require('../date_format')
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, async = require('async')
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, fs = require('fs')
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, util = require('util');
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module.exports = DateRollingFileStream;
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function DateRollingFileStream(filename, pattern, options, now) {
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debug("Now is " + now);
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if (pattern && typeof(pattern) === 'object') {
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now = options;
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options = pattern;
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pattern = null;
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}
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this.pattern = pattern || '.yyyy-MM-dd';
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this.now = now || Date.now;
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if (fs.existsSync(filename)) {
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var stat = fs.statSync(filename);
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this.lastTimeWeWroteSomething = format.asString(this.pattern, stat.mtime);
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} else {
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this.lastTimeWeWroteSomething = format.asString(this.pattern, new Date(this.now()));
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}
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this.baseFilename = filename;
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this.alwaysIncludePattern = false;
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if (options) {
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if (options.alwaysIncludePattern) {
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this.alwaysIncludePattern = true;
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filename = this.baseFilename + this.lastTimeWeWroteSomething;
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}
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delete options.alwaysIncludePattern;
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if (Object.keys(options).length === 0) {
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options = null;
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}
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}
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debug("this.now is " + this.now + ", now is " + now);
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DateRollingFileStream.super_.call(this, filename, options);
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}
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util.inherits(DateRollingFileStream, BaseRollingFileStream);
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DateRollingFileStream.prototype.shouldRoll = function() {
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var lastTime = this.lastTimeWeWroteSomething,
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thisTime = format.asString(this.pattern, new Date(this.now()));
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debug("DateRollingFileStream.shouldRoll with now = " +
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this.now() + ", thisTime = " + thisTime + ", lastTime = " + lastTime);
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this.lastTimeWeWroteSomething = thisTime;
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this.previousTime = lastTime;
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return thisTime !== lastTime;
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};
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DateRollingFileStream.prototype.roll = function(filename, callback) {
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var that = this;
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debug("Starting roll");
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if (this.alwaysIncludePattern) {
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this.filename = this.baseFilename + this.lastTimeWeWroteSomething;
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async.series([
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this.closeTheStream.bind(this),
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this.openTheStream.bind(this)
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], callback);
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} else {
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var newFilename = this.baseFilename + this.previousTime;
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async.series([
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this.closeTheStream.bind(this),
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deleteAnyExistingFile,
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renameTheCurrentFile,
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this.openTheStream.bind(this)
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], callback);
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}
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function deleteAnyExistingFile(cb) {
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//on windows, you can get a EEXIST error if you rename a file to an existing file
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//so, we'll try to delete the file we're renaming to first
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fs.unlink(newFilename, function (err) {
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//ignore err: if we could not delete, it's most likely that it doesn't exist
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cb();
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});
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}
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function renameTheCurrentFile(cb) {
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debug("Renaming the " + filename + " -> " + newFilename);
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fs.rename(filename, newFilename, cb);
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}
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};
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