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The MIT License (MIT)
Copyright (c) 2015 Roy Riojas
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# file-entry-cache
> Super simple cache for file metadata, useful for process that work o a given series of files
> and that only need to repeat the job on the changed ones since the previous run of the process — Edit
[![NPM Version](http://img.shields.io/npm/v/file-entry-cache.svg?style=flat)](https://npmjs.org/package/file-entry-cache)
[![Build Status](http://img.shields.io/travis/royriojas/file-entry-cache.svg?style=flat)](https://travis-ci.org/royriojas/file-entry-cache)
## install
```bash
npm i --save file-entry-cache
```
## Usage
The module exposes two functions `create` and `createFromFile`.
## `create(cacheName, [directory, useCheckSum])`
- **cacheName**: the name of the cache to be created
- **directory**: Optional the directory to load the cache from
- **usecheckSum**: Whether to use md5 checksum to verify if file changed. If false the default will be to use the mtime and size of the file.
## `createFromFile(pathToCache, [useCheckSum])`
- **pathToCache**: the path to the cache file (this combines the cache name and directory)
- **useCheckSum**: Whether to use md5 checksum to verify if file changed. If false the default will be to use the mtime and size of the file.
```js
// loads the cache, if one does not exists for the given
// Id a new one will be prepared to be created
var fileEntryCache = require('file-entry-cache');
var cache = fileEntryCache.create('testCache');
var files = expand('../fixtures/*.txt');
// the first time this method is called, will return all the files
var oFiles = cache.getUpdatedFiles(files);
// this will persist this to disk checking each file stats and
// updating the meta attributes `size` and `mtime`.
// custom fields could also be added to the meta object and will be persisted
// in order to retrieve them later
cache.reconcile();
// use this if you want the non visited file entries to be kept in the cache
// for more than one execution
//
// cache.reconcile( true /* noPrune */)
// on a second run
var cache2 = fileEntryCache.create('testCache');
// will return now only the files that were modified or none
// if no files were modified previous to the execution of this function
var oFiles = cache.getUpdatedFiles(files);
// if you want to prevent a file from being considered non modified
// something useful if a file failed some sort of validation
// you can then remove the entry from the cache doing
cache.removeEntry('path/to/file'); // path to file should be the same path of the file received on `getUpdatedFiles`
// that will effectively make the file to appear again as modified until the validation is passed. In that
// case you should not remove it from the cache
// if you need all the files, so you can determine what to do with the changed ones
// you can call
var oFiles = cache.normalizeEntries(files);
// oFiles will be an array of objects like the following
entry = {
key: 'some/name/file', the path to the file
changed: true, // if the file was changed since previous run
meta: {
size: 3242, // the size of the file
mtime: 231231231, // the modification time of the file
data: {} // some extra field stored for this file (useful to save the result of a transformation on the file
}
}
```
## Motivation for this module
I needed a super simple and dumb **in-memory cache** with optional disk persistence (write-back cache) in order to make
a script that will beautify files with `esformatter` to execute only on the files that were changed since the last run.
In doing so the process of beautifying files was reduced from several seconds to a small fraction of a second.
This module uses [flat-cache](https://www.npmjs.com/package/flat-cache) a super simple `key/value` cache storage with
optional file persistance.
The main idea is to read the files when the task begins, apply the transforms required, and if the process succeed,
then store the new state of the files. The next time this module request for `getChangedFiles` will return only
the files that were modified. Making the process to end faster.
This module could also be used by processes that modify the files applying a transform, in that case the result of the
transform could be stored in the `meta` field, of the entries. Anything added to the meta field will be persisted.
Those processes won't need to call `getChangedFiles` they will instead call `normalizeEntries` that will return the
entries with a `changed` field that can be used to determine if the file was changed or not. If it was not changed
the transformed stored data could be used instead of actually applying the transformation, saving time in case of only
a few files changed.
In the worst case scenario all the files will be processed. In the best case scenario only a few of them will be processed.
## Important notes
- The values set on the meta attribute of the entries should be `stringify-able` ones if possible, flat-cache uses `circular-json` to try to persist circular structures, but this should be considered experimental. The best results are always obtained with non circular values
- All the changes to the cache state are done to memory first and only persisted after reconcile.
## License
MIT

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var path = require('path');
var crypto = require('crypto');
module.exports = {
createFromFile: function (filePath, useChecksum) {
var fname = path.basename(filePath);
var dir = path.dirname(filePath);
return this.create(fname, dir, useChecksum);
},
create: function (cacheId, _path, useChecksum) {
var fs = require('fs');
var flatCache = require('flat-cache');
var cache = flatCache.load(cacheId, _path);
var normalizedEntries = {};
var removeNotFoundFiles = function removeNotFoundFiles() {
const cachedEntries = cache.keys();
// remove not found entries
cachedEntries.forEach(function remover(fPath) {
try {
fs.statSync(fPath);
} catch (err) {
if (err.code === 'ENOENT') {
cache.removeKey(fPath);
}
}
});
};
removeNotFoundFiles();
return {
/**
* the flat cache storage used to persist the metadata of the `files
* @type {Object}
*/
cache: cache,
/**
* Given a buffer, calculate md5 hash of its content.
* @method getHash
* @param {Buffer} buffer buffer to calculate hash on
* @return {String} content hash digest
*/
getHash: function (buffer) {
return crypto.createHash('md5').update(buffer).digest('hex');
},
/**
* Return whether or not a file has changed since last time reconcile was called.
* @method hasFileChanged
* @param {String} file the filepath to check
* @return {Boolean} wheter or not the file has changed
*/
hasFileChanged: function (file) {
return this.getFileDescriptor(file).changed;
},
/**
* given an array of file paths it return and object with three arrays:
* - changedFiles: Files that changed since previous run
* - notChangedFiles: Files that haven't change
* - notFoundFiles: Files that were not found, probably deleted
*
* @param {Array} files the files to analyze and compare to the previous seen files
* @return {[type]} [description]
*/
analyzeFiles: function (files) {
var me = this;
files = files || [];
var res = {
changedFiles: [],
notFoundFiles: [],
notChangedFiles: [],
};
me.normalizeEntries(files).forEach(function (entry) {
if (entry.changed) {
res.changedFiles.push(entry.key);
return;
}
if (entry.notFound) {
res.notFoundFiles.push(entry.key);
return;
}
res.notChangedFiles.push(entry.key);
});
return res;
},
getFileDescriptor: function (file) {
var fstat;
try {
fstat = fs.statSync(file);
} catch (ex) {
this.removeEntry(file);
return { key: file, notFound: true, err: ex };
}
if (useChecksum) {
return this._getFileDescriptorUsingChecksum(file);
}
return this._getFileDescriptorUsingMtimeAndSize(file, fstat);
},
_getFileDescriptorUsingMtimeAndSize: function (file, fstat) {
var meta = cache.getKey(file);
var cacheExists = !!meta;
var cSize = fstat.size;
var cTime = fstat.mtime.getTime();
var isDifferentDate;
var isDifferentSize;
if (!meta) {
meta = { size: cSize, mtime: cTime };
} else {
isDifferentDate = cTime !== meta.mtime;
isDifferentSize = cSize !== meta.size;
}
var nEntry = (normalizedEntries[file] = {
key: file,
changed: !cacheExists || isDifferentDate || isDifferentSize,
meta: meta,
});
return nEntry;
},
_getFileDescriptorUsingChecksum: function (file) {
var meta = cache.getKey(file);
var cacheExists = !!meta;
var contentBuffer;
try {
contentBuffer = fs.readFileSync(file);
} catch (ex) {
contentBuffer = '';
}
var isDifferent = true;
var hash = this.getHash(contentBuffer);
if (!meta) {
meta = { hash: hash };
} else {
isDifferent = hash !== meta.hash;
}
var nEntry = (normalizedEntries[file] = {
key: file,
changed: !cacheExists || isDifferent,
meta: meta,
});
return nEntry;
},
/**
* Return the list o the files that changed compared
* against the ones stored in the cache
*
* @method getUpdated
* @param files {Array} the array of files to compare against the ones in the cache
* @returns {Array}
*/
getUpdatedFiles: function (files) {
var me = this;
files = files || [];
return me
.normalizeEntries(files)
.filter(function (entry) {
return entry.changed;
})
.map(function (entry) {
return entry.key;
});
},
/**
* return the list of files
* @method normalizeEntries
* @param files
* @returns {*}
*/
normalizeEntries: function (files) {
files = files || [];
var me = this;
var nEntries = files.map(function (file) {
return me.getFileDescriptor(file);
});
//normalizeEntries = nEntries;
return nEntries;
},
/**
* Remove an entry from the file-entry-cache. Useful to force the file to still be considered
* modified the next time the process is run
*
* @method removeEntry
* @param entryName
*/
removeEntry: function (entryName) {
delete normalizedEntries[entryName];
cache.removeKey(entryName);
},
/**
* Delete the cache file from the disk
* @method deleteCacheFile
*/
deleteCacheFile: function () {
cache.removeCacheFile();
},
/**
* remove the cache from the file and clear the memory cache
*/
destroy: function () {
normalizedEntries = {};
cache.destroy();
},
_getMetaForFileUsingCheckSum: function (cacheEntry) {
var contentBuffer = fs.readFileSync(cacheEntry.key);
var hash = this.getHash(contentBuffer);
var meta = Object.assign(cacheEntry.meta, { hash: hash });
delete meta.size;
delete meta.mtime;
return meta;
},
_getMetaForFileUsingMtimeAndSize: function (cacheEntry) {
var stat = fs.statSync(cacheEntry.key);
var meta = Object.assign(cacheEntry.meta, {
size: stat.size,
mtime: stat.mtime.getTime(),
});
delete meta.hash;
return meta;
},
/**
* Sync the files and persist them to the cache
* @method reconcile
*/
reconcile: function (noPrune) {
removeNotFoundFiles();
noPrune = typeof noPrune === 'undefined' ? true : noPrune;
var entries = normalizedEntries;
var keys = Object.keys(entries);
if (keys.length === 0) {
return;
}
var me = this;
keys.forEach(function (entryName) {
var cacheEntry = entries[entryName];
try {
var meta = useChecksum
? me._getMetaForFileUsingCheckSum(cacheEntry)
: me._getMetaForFileUsingMtimeAndSize(cacheEntry);
cache.setKey(entryName, meta);
} catch (err) {
// if the file does not exists we don't save it
// other errors are just thrown
if (err.code !== 'ENOENT') {
throw err;
}
}
});
cache.save(noPrune);
},
};
},
};

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# file-entry-cache - Changelog
## v6.0.1
- **Other changes**
- Delete previous mtime when checksum is used and vice versa - [abcf0f9]( https://github.com/royriojas/file-entry-cache/commit/abcf0f9 ), [Milos Djermanovic](https://github.com/Milos Djermanovic), 19/02/2021 18:19:43
- Adds travis jobs on ppc64le - [92e4d4a]( https://github.com/royriojas/file-entry-cache/commit/92e4d4a ), [dineshks1](https://github.com/dineshks1), 25/11/2020 04:52:11
## v6.0.0
- **Refactoring**
- Align file-entry-cache with latest eslint - [4c6f1fb]( https://github.com/royriojas/file-entry-cache/commit/4c6f1fb ), [Roy Riojas](https://github.com/Roy Riojas), 08/11/2020 02:43:09
- Upgrade deps - [8ab3257]( https://github.com/royriojas/file-entry-cache/commit/8ab3257 ), [Roy Riojas](https://github.com/Roy Riojas), 08/11/2020 02:41:53
- updated packages - [3dd4231]( https://github.com/royriojas/file-entry-cache/commit/3dd4231 ), [Roy Riojas](https://github.com/Roy Riojas), 08/11/2020 02:29:37
- Upgrade flat-cache to version 3 - [d7c60ef]( https://github.com/royriojas/file-entry-cache/commit/d7c60ef ), [Roy Riojas](https://github.com/Roy Riojas), 08/11/2020 01:18:04
## v5.0.1
- **Bug Fixes**
- Fix missing checksum comparison from reconcile since now we use mtime and size by default. - [e858aa9]( https://github.com/royriojas/file-entry-cache/commit/e858aa9 ), [Roy Riojas](https://github.com/Roy Riojas), 04/02/2019 09:30:22
Old mode using checkSum can still be used by passing the `useCheckSum` parameter to the `create` or `createFromFile` methods.
## v5.0.0
- **Refactoring**
- Make checksum comparison optional - [b0f9ae0]( https://github.com/royriojas/file-entry-cache/commit/b0f9ae0 ), [Roy Riojas](https://github.com/Roy Riojas), 03/02/2019 18:17:39
To determine if a file has changed we were using the checksum in the newer versions, but eslint was relying on the old behavior where we use the mtime and file size to determine if a file changed. That's why we decided to make the checksum check optional.
To use it:
```js
// to make the cache use the checkSum check do the following:
var fCache = fileEntryCache.create(cacheName, dir, useCheckSum); // pass the third parameter as true
var otherCache = fileEntryCache.createFromFile(cacheName, useCheckSum); // pass the second parameter as true
```
## v4.0.0
- **Build Scripts Changes**
- use the same node versions eslint use - [563cfee]( https://github.com/royriojas/file-entry-cache/commit/563cfee ), [Roy Riojas](https://github.com/Roy Riojas), 08/01/2019 20:29:34
- **Other changes**
- Remove object-assign dependency. - [d0f598e]( https://github.com/royriojas/file-entry-cache/commit/d0f598e ), [Corey Farrell](https://github.com/Corey Farrell), 08/01/2019 20:09:51
node.js >=4 is required so object-assign is no longer needed, the native
Object.assign can be used instead.
## v3.0.0
- **Build Scripts Changes**
- Upgrade flat-cache dep to latest - [078b0df]( https://github.com/royriojas/file-entry-cache/commit/078b0df ), [Roy Riojas](https://github.com/Roy Riojas), 08/01/2019 18:54:40
- Commit new package-lock.json file - [245fe62]( https://github.com/royriojas/file-entry-cache/commit/245fe62 ), [Roy Riojas](https://github.com/Roy Riojas), 08/01/2019 17:56:21
- **Refactoring**
- add eslintrc file - [6dd32d8]( https://github.com/royriojas/file-entry-cache/commit/6dd32d8 ), [Roy Riojas](https://github.com/Roy Riojas), 22/08/2018 09:58:17
- **Other changes**
- Move variable definition out of else block - [ea05441]( https://github.com/royriojas/file-entry-cache/commit/ea05441 ), [Zakhar Shapurau](https://github.com/Zakhar Shapurau), 25/04/2017 11:19:00
- Add script and cmd to test hash/checksum performance - [7f60e0a]( https://github.com/royriojas/file-entry-cache/commit/7f60e0a ), [Zakhar Shapurau](https://github.com/Zakhar Shapurau), 24/04/2017 14:43:12
- Calculate md5 hexdigest instead of Adler-32 checksum - [f9e5c69]( https://github.com/royriojas/file-entry-cache/commit/f9e5c69 ), [Zakhar Shapurau](https://github.com/Zakhar Shapurau), 24/04/2017 14:43:12
- How to reproduce - [4edc2dc]( https://github.com/royriojas/file-entry-cache/commit/4edc2dc ), [Zakhar Shapurau](https://github.com/Zakhar Shapurau), 24/04/2017 13:49:32
- Test handling of removed files - [09d9ec5]( https://github.com/royriojas/file-entry-cache/commit/09d9ec5 ), [Zakhar Shapurau](https://github.com/Zakhar Shapurau), 19/04/2017 19:51:50
- Use content checksum instead of mtime and fsize - [343b340]( https://github.com/royriojas/file-entry-cache/commit/343b340 ), [Zakhar Shapurau](https://github.com/Zakhar Shapurau), 19/04/2017 19:51:47
- **Revert**
- Revert "How to reproduce" - [4b4e54a]( https://github.com/royriojas/file-entry-cache/commit/4b4e54a ), [Zakhar Shapurau](https://github.com/Zakhar Shapurau), 25/04/2017 11:15:36
This reverts commit 4edc2dcec01574247bfc2e0a2fe26527332b7df3.
## v2.0.0
- **Features**
- do not persist and prune removed files from cache. Relates to [#2](https://github.com/royriojas/file-entry-cache/issues/2) - [408374d]( https://github.com/royriojas/file-entry-cache/commit/408374d ), [Roy Riojas](https://github.com/Roy Riojas), 16/08/2016 13:47:58
## v1.3.1
- **Build Scripts Changes**
- remove older node version - [0a26ac4]( https://github.com/royriojas/file-entry-cache/commit/0a26ac4 ), [Roy Riojas](https://github.com/Roy Riojas), 01/08/2016 04:09:17
## v1.3.0
- **Features**
- Add an option to not prune non visited keys. Closes [#2](https://github.com/royriojas/file-entry-cache/issues/2) - [b1a64db]( https://github.com/royriojas/file-entry-cache/commit/b1a64db ), [Roy Riojas](https://github.com/Roy Riojas), 01/08/2016 03:52:12
## v1.2.4
- **Enhancements**
- Expose the flat-cache instance - [f34c557]( https://github.com/royriojas/file-entry-cache/commit/f34c557 ), [royriojas](https://github.com/royriojas), 23/09/2015 18:26:33
## v1.2.3
- **Build Scripts Changes**
- update flat-cache dep - [cc7b9ce]( https://github.com/royriojas/file-entry-cache/commit/cc7b9ce ), [royriojas](https://github.com/royriojas), 11/09/2015 16:04:44
## v1.2.2
- **Build Scripts Changes**
- Add changelogx section to package.json - [a3916ff]( https://github.com/royriojas/file-entry-cache/commit/a3916ff ), [royriojas](https://github.com/royriojas), 11/09/2015 16:00:26
## v1.2.1
- **Build Scripts Changes**
- update flat-cache dep - [e49b0d4]( https://github.com/royriojas/file-entry-cache/commit/e49b0d4 ), [royriojas](https://github.com/royriojas), 11/09/2015 15:55:25
- **Other changes**
- Update dependencies Replaced lodash.assign with smaller object-assign Fixed tests for windows - [0ad3000]( https://github.com/royriojas/file-entry-cache/commit/0ad3000 ), [Bogdan Chadkin](https://github.com/Bogdan Chadkin), 11/09/2015 15:44:18
## v1.2.0
- **Features**
- analyzeFiles now returns also the files that were removed - [6ac2431]( https://github.com/royriojas/file-entry-cache/commit/6ac2431 ), [royriojas](https://github.com/royriojas), 04/09/2015 12:40:53
## v1.1.1
- **Features**
- Add method to check if a file hasChanged - [3640e2b]( https://github.com/royriojas/file-entry-cache/commit/3640e2b ), [Roy Riojas](https://github.com/Roy Riojas), 30/08/2015 05:33:32
## v1.1.0
- **Features**
- Create the cache directly from a file path - [a23de61]( https://github.com/royriojas/file-entry-cache/commit/a23de61 ), [Roy Riojas](https://github.com/Roy Riojas), 30/08/2015 04:41:33
- Add a method to remove an entry from the filecache - [7af29fc]( https://github.com/royriojas/file-entry-cache/commit/7af29fc ), [Roy Riojas](https://github.com/Roy Riojas), 02/03/2015 23:25:32
- cache module finished - [1f95544]( https://github.com/royriojas/file-entry-cache/commit/1f95544 ), [Roy Riojas](https://github.com/Roy Riojas), 02/03/2015 01:08:08
- **Build Scripts Changes**
- set the version for the first release - [7472eaa]( https://github.com/royriojas/file-entry-cache/commit/7472eaa ), [Roy Riojas](https://github.com/Roy Riojas), 02/03/2015 01:29:54
- **Documentation**
- Updated documentation - [557358f]( https://github.com/royriojas/file-entry-cache/commit/557358f ), [Roy Riojas](https://github.com/Roy Riojas), 02/03/2015 01:29:29
- **Other changes**
- Initial commit - [3d5f42b]( https://github.com/royriojas/file-entry-cache/commit/3d5f42b ), [Roy Riojas](https://github.com/Roy Riojas), 01/03/2015 21:58:29

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{
"name": "file-entry-cache",
"version": "6.0.1",
"description": "Super simple cache for file metadata, useful for process that work o a given series of files and that only need to repeat the job on the changed ones since the previous run of the process",
"repository": "royriojas/file-entry-cache",
"license": "MIT",
"author": {
"name": "Roy Riojas",
"url": "http://royriojas.com"
},
"main": "cache.js",
"files": [
"cache.js"
],
"engines": {
"node": "^10.12.0 || >=12.0.0"
},
"scripts": {
"eslint": "eslint --cache --cache-location=node_modules/.cache/ 'cache.js' 'test/**/*.js' 'perf.js'",
"autofix": "npm run eslint -- --fix",
"install-hooks": "prepush install && changelogx install-hook && precommit install",
"changelog": "changelogx -f markdown -o ./changelog.md",
"do-changelog": "npm run changelog && git add ./changelog.md && git commit -m 'DOC: Generate changelog' --no-verify",
"pre-v": "npm run test",
"post-v": "npm run do-changelog && git push --no-verify && git push --tags --no-verify",
"bump-major": "npm run pre-v && npm version major -m 'BLD: Release v%s' && npm run post-v",
"bump-minor": "npm run pre-v && npm version minor -m 'BLD: Release v%s' && npm run post-v",
"bump-patch": "npm run pre-v && npm version patch -m 'BLD: Release v%s' && npm run post-v",
"test": "npm run eslint --silent && mocha -R spec test/specs",
"perf": "node perf.js",
"cover": "istanbul cover test/runner.js html text-summary",
"watch": "watch-run -i -p 'test/specs/**/*.js' istanbul cover test/runner.js html text-summary"
},
"prepush": [
"npm run eslint --silent"
],
"precommit": [
"npm run eslint --silent"
],
"keywords": [
"file cache",
"task cache files",
"file cache",
"key par",
"key value",
"cache"
],
"changelogx": {
"ignoreRegExp": [
"BLD: Release",
"DOC: Generate Changelog",
"Generated Changelog"
],
"issueIDRegExp": "#(\\d+)",
"commitURL": "https://github.com/royriojas/file-entry-cache/commit/{0}",
"authorURL": "https://github.com/{0}",
"issueIDURL": "https://github.com/royriojas/file-entry-cache/issues/{0}",
"projectName": "file-entry-cache"
},
"devDependencies": {
"chai": "^4.2.0",
"changelogx": "^5.0.6",
"del": "^6.0.0",
"eslint": "^7.13.0",
"eslint-config-prettier": "^6.15.0",
"eslint-plugin-mocha": "^8.0.0",
"eslint-plugin-prettier": "^3.1.4",
"glob-expand": "^0.2.1",
"istanbul": "^0.4.5",
"mocha": "^8.2.1",
"precommit": "^1.2.2",
"prepush": "^3.1.11",
"prettier": "^2.1.2",
"watch-run": "^1.2.5",
"write": "^2.0.0"
},
"dependencies": {
"flat-cache": "^3.0.4"
}
}