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"use strict";
var BaseRollingFileStream = require('./BaseRollingFileStream')
, debug = require('../debug')('RollingFileStream')
, util = require('util')
, path = require('path')
, child_process = require('child_process')
, zlib = require("zlib")
, fs = require('fs');
module.exports = RollingFileStream;
function RollingFileStream (filename, size, backups, options) {
this.size = size;
this.backups = backups || 1;
function throwErrorIfArgumentsAreNotValid() {
if (!filename || !size || size <= 0) {
throw new Error("You must specify a filename and file size");
}
}
throwErrorIfArgumentsAreNotValid();
RollingFileStream.super_.call(this, filename, options);
}
util.inherits(RollingFileStream, BaseRollingFileStream);
RollingFileStream.prototype.shouldRoll = function() {
debug("should roll with current size " + this.currentSize + " and max size " + this.size);
return this.currentSize >= this.size;
};
RollingFileStream.prototype.roll = function(filename, callback) {
var that = this,
nameMatcher = new RegExp('^' + path.basename(filename));
function justTheseFiles (item) {
return nameMatcher.test(item);
}
function index(filename_) {
debug('Calculating index of '+filename_);
return parseInt(filename_.substring((path.basename(filename) + '.').length), 10) || 0;
}
function byIndex(a, b) {
if (index(a) > index(b)) {
return 1;
} else if (index(a) < index(b) ) {
return -1;
} else {
return 0;
}
}
function compress (filename, cb) {
var gzip = zlib.createGzip();
var inp = fs.createReadStream(filename);
var out = fs.createWriteStream(filename+".gz");
inp.pipe(gzip).pipe(out);
fs.unlink(filename, cb);
}
function increaseFileIndex (fileToRename, cb) {
var idx = index(fileToRename);
debug('Index of ' + fileToRename + ' is ' + idx);
if (idx < that.backups) {
var ext = path.extname(fileToRename);
var destination = filename + '.' + (idx+1);
if (that.options.compress && /^gz$/.test(ext.substring(1))) {
destination+=ext;
}
//on windows, you can get a EEXIST error if you rename a file to an existing file
//so, we'll try to delete the file we're renaming to first
fs.unlink(destination, function (err) {
//ignore err: if we could not delete, it's most likely that it doesn't exist
debug('Renaming ' + fileToRename + ' -> ' + destination);
fs.rename(path.join(path.dirname(filename), fileToRename), destination, function(err) {
if (err) {
cb(err);
} else {
if (that.options.compress && ext!=".gz") {
compress(destination, cb);
} else {
cb();
}
}
});
});
} else {
cb();
}
}
function renameTheFiles(cb) {
//roll the backups (rename file.n to file.n+1, where n <= numBackups)
debug("Renaming the old files");
fs.readdir(path.dirname(filename), function (err, files) {
var filesToProcess = files.filter(justTheseFiles).sort(byIndex);
(function processOne(err) {
var file = filesToProcess.pop();
if (!file || err) { return cb(err); }
increaseFileIndex(file, processOne);
})();
});
}
debug("Rolling, rolling, rolling");
this.closeTheStream(
renameTheFiles.bind(null,
this.openTheStream.bind(this,
callback)));
};
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