File size: 8,933 Bytes
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var fs = require('fs');
var async = require('async');
var path = require('path');
var strftime = require('strftime');
var _ = require('lodash');
var _DEBUG = false;
function DateStampedFileOps(logpath, totalFiles, totalSize, gzip) {
var filenameTimestamp = new Date();
var nonce = 0;
var parsedPath = path.parse(logpath);
var reopenedFilePath = null;
function getFilesInLogDirectory(next) {
fs.readdir(path.resolve(parsedPath.dir), function (err, files) {
if (err) throw err;
next(null, files);
});
}
function removeN(originalName) {
return originalName
.replace('.%N', '')
.replace('_%N', '')
.replace('-%N', '')
.replace('%N', '');
}
function filterJustOurLogFiles(includeZipFiles) {
return function (files, next) {
var logfiles = _.filter(files, function (file) {
var parsedFile = path.parse(
path.resolve(
path.join(
parsedPath.dir,
file
)
)
);
var prefixes = [];
var parts = parsedPath.name.split('%');
prefixes.push(parts.slice(0, 1).join(''));
if (parts.slice(1,2).join('').slice(0,1) === 'N') {
// First substitution part is %N, which might not be used
// Need to check the prefix when %N isn't used
var altname = removeN(parsedPath.name);
parts = altname.split('%');
prefixes.push(parts.slice(0, 1).join(''));
}
if (includeZipFiles && parsedFile.ext === '.gz') {
var splitname = parsedFile.name.split('.');
parsedFile.ext = '.' + splitname.slice(-1).join('');
if (parsedFile.ext === '.') {
parsedFile.ext === '';
}
parsedFile.name = splitname.slice(0, -1).join('.');
}
return (_.some(prefixes, function (prefix) { return parsedFile.name.indexOf(prefix) === 0; }) &&
parsedFile.ext === parsedPath.ext);
});
next(null, logfiles);
}
}
function statEachFile(logfiles, next) {
async.map(logfiles, function (logfile, next) {
var fullpath = path.resolve(path.join(parsedPath.dir, logfile));
fs.stat(fullpath, function (err, stat) {
next(err, {
stat: stat,
path: fullpath
});
});
}, function (err, stats) {
next(err, stats);
});
}
function sortFilesByModifiedTime(logstats, next) {
async.sortBy(logstats, function (logstat, next) {
next(null, -logstat.stat.mtime);
}, next);
}
function deleteFilesAfterCountBreach(logstats, next) {
var currentCount = 0;
var toDelete = [];
var toContinue = [];
logstats.forEach(function (logstat) {
currentCount += 1;
if (totalFiles && currentCount > totalFiles) {
toDelete.push(logstat);
} else {
toContinue.push(logstat);
}
});
async.each(toDelete, function (logstat, next) {
fs.unlink(logstat.path, next);
}, function (err) {
next(err, toContinue);
});
}
function deleteFilesAfterSizeBreach(logstats, next) {
var currentSize = 0;
var toDelete = [];
var toContinue = [];
logstats.forEach(function (logstat) {
currentSize += logstat.stat.size;
if (totalSize && currentSize > totalSize) {
toDelete.push(logstat);
} else {
toContinue.push(logstat);
}
});
async.each(toDelete, function (logstat, next) {
fs.unlink(logstat.path, next);
}, function (err) {
next(err, toContinue);
});
}
function getSortedLogFiles(matchzippedfiles) {
return function (next) {
async.waterfall([
getFilesInLogDirectory,
filterJustOurLogFiles(matchzippedfiles),
statEachFile,
sortFilesByModifiedTime
], function (err, logfiles) {
next(err, logfiles);
});
}
}
function deleteFiles(next) {
async.waterfall([
getSortedLogFiles(true),
deleteFilesAfterCountBreach,
deleteFilesAfterSizeBreach
], function (err) {
next(err);
});
};
function moveIntermediateFiles(next) {
process.nextTick(function () {
next();
});
};
function internalGetStreamFilepath(gzipped, nonce) {
var result;
if (reopenedFilePath !== null) {
result = path.parse(reopenedFilePath);
} else {
result = _.extend({}, parsedPath);
if (nonce === 0) {
result.name = removeN(result.name);
} else if (result.name.indexOf('%N') >= 0) {
result.name = result.name.replace('%N', String(nonce));
} else {
result.name = result.name + '.' + String(nonce);
}
result.name = strftime(result.name, filenameTimestamp);
}
if (gzipped) {
result.ext += '.gz';
}
result.base = result.name + result.ext;
return path.resolve(path.format(result));
}
function getStreamFilepath(gzipped) {
return internalGetStreamFilepath(gzipped, nonce);
}
function findUnusedFile(nonce, next) {
var filepath = internalGetStreamFilepath(false, nonce);
var filepathgz = internalGetStreamFilepath(true, nonce);
async.each([
filepath,
filepathgz
], function (potentialpath, pathresult) {
fs.stat(potentialpath, function (err, stats) {
if (err && err.code === 'ENOENT') {
// File doesn't already exist, this is good
pathresult();
} else if (err) {
// Something else failed
pathresult(err);
} else {
// Path existed, use something else
pathresult('inuse');
}
})
}, function (err) {
if (err && err === 'inuse') {
findUnusedFile(nonce + 1, next);
} else if (err) {
next(err);
} else {
// Open the file exclusively to ensure we own it
fs.open(filepath, 'wx', function (err, fd) {
if (err && err.code === 'EEXIST') {
findUnusedFile(nonce + 1, next);
} else if (err) {
return next(err);
} else {
fs.close(fd, function () {
next(null, filepath, nonce);
});
}
});
}
})
}
function createNewFile(next) {
reopenedFilePath = null;
findUnusedFile(0, function (err, filepath, foundnonce) {
nonce = foundnonce || 0;
next(err, filepath);
});
}
function newStreamFilepath(triggerinfo, next) {
filenameTimestamp = new Date(triggerinfo.date || Date.now());
var startNewFile = !triggerinfo.hasOwnProperty('startNewFile') ||
triggerinfo.startNewFile;
if (startNewFile) {
createNewFile(next);
} else {
getSortedLogFiles(false)(function (err, logfiles) {
if (err) {
return next(err);
}
if (logfiles.length === 0) {
return createNewFile(next);
} else {
reopenedFilePath = logfiles[0].path;
next(null, reopenedFilePath);
}
});
}
}
return {
getStreamFilepath: getStreamFilepath,
newStreamFilepath: newStreamFilepath,
deleteFiles: deleteFiles,
moveIntermediateFiles: moveIntermediateFiles
};
}
DateStampedFileOps.isDateStamped = function (logpath) {
var parsed = path.parse(logpath);
var withoutN = parsed.name.replace('%N', '');
return (withoutN !== strftime(withoutN));
}
module.exports = DateStampedFileOps;
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