Backported the old streams. Nasty if statements abound.
This commit is contained in:
Gareth Jones
99
lib/old-streams/BaseRollingFileStream.js
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99
lib/old-streams/BaseRollingFileStream.js
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var fs = require('fs'),
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util = require('util');
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function debug(message) {
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// console.log(message);
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}
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module.exports = BaseRollingFileStream;
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function BaseRollingFileStream(filename, options) {
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debug("In BaseRollingFileStream");
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this.filename = filename;
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this.options = options || { encoding: 'utf8', mode: 0644, flags: 'a' };
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this.rolling = false;
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this.writesWhileRolling = [];
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this.currentSize = 0;
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this.rollBeforeWrite = false;
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function currentFileSize(file) {
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var fileSize = 0;
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try {
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fileSize = fs.statSync(file).size;
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} catch (e) {
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// file does not exist
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}
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return fileSize;
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}
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function throwErrorIfArgumentsAreNotValid() {
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if (!filename) {
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throw new Error("You must specify a filename");
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}
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}
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throwErrorIfArgumentsAreNotValid();
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debug("Calling BaseRollingFileStream.super");
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BaseRollingFileStream.super_.call(this, this.filename, this.options);
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this.currentSize = currentFileSize(this.filename);
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}
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util.inherits(BaseRollingFileStream, fs.FileWriteStream);
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BaseRollingFileStream.prototype.initRolling = function() {
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var that = this;
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function emptyRollingQueue() {
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debug("emptying the rolling queue");
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var toWrite;
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while ((toWrite = that.writesWhileRolling.shift())) {
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BaseRollingFileStream.super_.prototype.write.call(that, toWrite.data, toWrite.encoding);
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that.currentSize += toWrite.data.length;
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if (that.shouldRoll()) {
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that.flush();
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return true;
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}
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}
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that.flush();
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return false;
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}
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this.rolling = true;
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this.roll(this.filename, function() {
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that.currentSize = 0;
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that.rolling = emptyRollingQueue();
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if (that.rolling) {
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process.nextTick(function() { that.initRolling(); });
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}
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});
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};
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BaseRollingFileStream.prototype.write = function(data, encoding) {
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var canWrite = false;
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if (this.rolling) {
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this.writesWhileRolling.push({ data: data, encoding: encoding });
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} else {
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if (this.rollBeforeWrite && this.shouldRoll()) {
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this.writesWhileRolling.push({ data: data, encoding: encoding });
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this.initRolling();
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} else {
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canWrite = BaseRollingFileStream.super_.prototype.write.call(this, data, encoding);
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this.currentSize += data.length;
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debug('current size = ' + this.currentSize);
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if (!this.rollBeforeWrite && this.shouldRoll()) {
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this.initRolling();
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}
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}
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}
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return canWrite;
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};
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BaseRollingFileStream.prototype.shouldRoll = function() {
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return false; // default behaviour is never to roll
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};
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BaseRollingFileStream.prototype.roll = function(filename, callback) {
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callback(); // default behaviour is not to do anything
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};
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78
lib/old-streams/BufferedWriteStream.js
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78
lib/old-streams/BufferedWriteStream.js
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var events = require('events'),
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Dequeue = require('dequeue'),
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util = require('util');
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module.exports = BufferedWriteStream;
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function BufferedWriteStream(stream) {
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var that = this;
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this.stream = stream;
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this.buffer = new Dequeue();
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this.canWrite = false;
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this.bytes = 0;
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this.stream.on("open", function() {
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that.canWrite = true;
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that.flushBuffer();
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});
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this.stream.on("error", function (err) {
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that.emit("error", err);
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});
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this.stream.on("drain", function() {
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that.canWrite = true;
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that.flushBuffer();
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});
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}
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util.inherits(BufferedWriteStream, events.EventEmitter);
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Object.defineProperty(
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BufferedWriteStream.prototype,
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"fd",
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{
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get: function() { return this.stream.fd; },
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set: function(newFd) {
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this.stream.fd = newFd;
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this.bytes = 0;
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}
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}
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);
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Object.defineProperty(
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BufferedWriteStream.prototype,
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"bytesWritten",
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{
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get: function() { return this.bytes; }
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}
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);
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BufferedWriteStream.prototype.write = function(data, encoding) {
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this.buffer.push({ data: data, encoding: encoding });
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this.flushBuffer();
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};
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BufferedWriteStream.prototype.end = function(data, encoding) {
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if (data) {
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this.buffer.push({ data: data, encoding: encoding });
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}
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this.flushBufferEvenIfCannotWrite();
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};
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BufferedWriteStream.prototype.writeToStream = function(toWrite) {
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this.bytes += toWrite.data.length;
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this.canWrite = this.stream.write(toWrite.data, toWrite.encoding);
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};
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BufferedWriteStream.prototype.flushBufferEvenIfCannotWrite = function() {
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while (this.buffer.length > 0) {
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this.writeToStream(this.buffer.shift());
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}
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};
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BufferedWriteStream.prototype.flushBuffer = function() {
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while (this.buffer.length > 0 && this.canWrite) {
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this.writeToStream(this.buffer.shift());
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}
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};
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89
lib/old-streams/DateRollingFileStream.js
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89
lib/old-streams/DateRollingFileStream.js
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@@ -0,0 +1,89 @@
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var BaseRollingFileStream = require('./BaseRollingFileStream'),
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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 debug(message) {
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// console.log(message);
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}
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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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this.lastTimeWeWroteSomething = format.asString(this.pattern, new Date(this.now()));
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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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this.rollBeforeWrite = true;
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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 = " + 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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newFilename = filename + this.previousTime;
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debug("Starting roll");
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debug("Queueing up data until we've finished rolling");
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debug("Flushing underlying stream");
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this.flush();
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async.series([
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deleteAnyExistingFile,
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renameTheCurrentFile,
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openANewFile
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], callback);
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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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function openANewFile(cb) {
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debug("Opening a new file");
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fs.open(
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filename,
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that.options.flags,
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that.options.mode,
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function (err, fd) {
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debug("opened new file");
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var oldLogFileFD = that.fd;
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that.fd = fd;
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that.writable = true;
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fs.close(oldLogFileFD, cb);
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}
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);
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}
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};
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1
lib/old-streams/README.md
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1
lib/old-streams/README.md
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These are for pre-0.10.x versions of node and are here just for backwards compatibility. No bug fixes or enhancements will be made to these files.
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110
lib/old-streams/RollingFileStream.js
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110
lib/old-streams/RollingFileStream.js
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var BaseRollingFileStream = require('./BaseRollingFileStream'),
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util = require('util'),
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path = require('path'),
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fs = require('fs'),
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async = require('async');
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function debug(message) {
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// util.debug(message);
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// console.log(message);
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}
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module.exports = RollingFileStream;
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function RollingFileStream (filename, size, backups, options) {
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this.size = size;
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this.backups = backups || 1;
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function throwErrorIfArgumentsAreNotValid() {
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if (!filename || !size || size <= 0) {
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throw new Error("You must specify a filename and file size");
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}
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}
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throwErrorIfArgumentsAreNotValid();
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RollingFileStream.super_.call(this, filename, options);
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}
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util.inherits(RollingFileStream, BaseRollingFileStream);
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RollingFileStream.prototype.shouldRoll = function() {
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return this.currentSize >= this.size;
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};
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RollingFileStream.prototype.roll = function(filename, callback) {
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var that = this,
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nameMatcher = new RegExp('^' + path.basename(filename));
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function justTheseFiles (item) {
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return nameMatcher.test(item);
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}
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function index(filename_) {
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return parseInt(filename_.substring((path.basename(filename) + '.').length), 10) || 0;
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}
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function byIndex(a, b) {
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if (index(a) > index(b)) {
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return 1;
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} else if (index(a) < index(b) ) {
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return -1;
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} else {
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return 0;
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}
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}
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function increaseFileIndex (fileToRename, cb) {
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var idx = index(fileToRename);
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debug('Index of ' + fileToRename + ' is ' + idx);
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if (idx < that.backups) {
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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(filename + '.' + (idx+1), 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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debug('Renaming ' + fileToRename + ' -> ' + filename + '.' + (idx+1));
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fs.rename(path.join(path.dirname(filename), fileToRename), filename + '.' + (idx + 1), cb);
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});
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} else {
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cb();
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}
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}
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function renameTheFiles(cb) {
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//roll the backups (rename file.n to file.n+1, where n <= numBackups)
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debug("Renaming the old files");
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fs.readdir(path.dirname(filename), function (err, files) {
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async.forEachSeries(
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files.filter(justTheseFiles).sort(byIndex).reverse(),
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increaseFileIndex,
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cb
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);
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});
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}
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function openANewFile(cb) {
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debug("Opening a new file");
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fs.open(
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filename,
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that.options.flags,
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that.options.mode,
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function (err, fd) {
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debug("opened new file");
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var oldLogFileFD = that.fd;
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that.fd = fd;
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that.writable = true;
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fs.close(oldLogFileFD, cb);
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}
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);
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}
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debug("Starting roll");
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debug("Queueing up data until we've finished rolling");
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debug("Flushing underlying stream");
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this.flush();
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async.series([
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renameTheFiles,
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openANewFile
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], callback);
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};
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3
lib/old-streams/index.js
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3
lib/old-streams/index.js
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@@ -0,0 +1,3 @@
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exports.BufferedWriteStream = require('./BufferedWriteStream');
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exports.RollingFileStream = require('./RollingFileStream');
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exports.DateRollingFileStream = require('./DateRollingFileStream');
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