angel_cache 1.0.0

  • Example
  • Installing
  • Versions
  • 0

cache #

Pub build status

Support for server-side caching in Angel.

CacheService #

A Service class that caches data from one service, storing it in another. An imaginable use case is storing results from MongoDB or another database in MemcacheD/Redis.

cacheSerializationResults #

A middleware that enables the caching of response serialization.

This can improve the performance of sending objects that are complex to serialize. You can pass a [shouldCache] callback to determine which values should be cached.

main() async {
    var app = new Angel()..lazyParseBodies = true;
      new CacheService(
        database: new AnonymousService(
          index: ([params]) {
            print('Fetched directly from the underlying service at ${new}!');
            return ['foo', 'bar', 'baz'];
          read: (id, [params]) {
            return {id: '$id at ${new}'};

ResponseCache #

A flexible response cache for Angel.

Use this to improve real and perceived response of Web applications, as well as to memoize expensive responses.

Supports the If-Modified-Since header, as well as storing the contents of response buffers in memory.

To initialize a simple cache:

Future configureServer(Angel app) async {
  // Simple instance.
  var cache = new ResponseCache();
  // You can also pass an invalidation timeout.
  var cache = new ResponseCache(timeout: const Duration(days: 2));
  // Close the cache when the application closes.
  app.shutdownHooks.add((_) => cache.close());
  // Use `patterns` to specify which resources should be cached.
    new RegExp(r'\.(png|jpg|gif|txt)$'),
    new Glob('public/**/*'),
  // REQUIRED: The middleware that serves cached responses
  // REQUIRED: The response finalizer that saves responses to the cache

Purging the Cache #

Call invalidate to remove a resource from a ResponseCache.

Some servers expect a reverse proxy or caching layer to support PURGE requests. If this is your case, make sure to include some sort of validation (maybe IP-based) to ensure no arbitrary attacker can hack your cache:

Future configureServer(Angel app) async {
  app.addRoute('PURGE', '*', (req, res) {
    if (req.ip != '')
      throw new AngelHttpException.forbidden();
    return cache.purge(req.uri.path);

1.0.0 #

  • First version


import 'package:angel_cache/angel_cache.dart';
import 'package:angel_framework/angel_framework.dart';
import 'package:glob/glob.dart';

main() async {
  var app = new Angel()..lazyParseBodies = true;

  // Cache a glob
  var cache = new ResponseCache()
      new Glob('/*.txt'),

  // Handle `if-modified-since` header, and also send cached content

  // A simple handler that returns a different result every time.
      (ResponseContext res) => res.write(new;

  // Support purging the cache.
  app.addRoute('PURGE', '*', (RequestContext req) {
    if (req.ip != '') throw new AngelHttpException.forbidden();

    print('Purged ${req.uri.path}');

  // The response finalizer that actually saves the content

  var http = new AngelHttp(app);
  var server = await http.startServer('', 3000);
  print('Listening at http://${server.address.address}:${server.port}');

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  angel_cache: ^1.0.0

2. Install it

You can install packages from the command line:

with pub:

$ pub get

Alternatively, your editor might support pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:angel_cache/angel_cache.dart';
Version Uploaded Documentation Archive
2.0.1 Nov 10, 2018 Go to the documentation of angel_cache 2.0.1 Download angel_cache 2.0.1 archive
2.0.0 Oct 21, 2018 Go to the documentation of angel_cache 2.0.0 Download angel_cache 2.0.0 archive
1.0.0 May 16, 2018 Go to the documentation of angel_cache 1.0.0 Download angel_cache 1.0.0 archive
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Learn more about scoring.

The package version is not analyzed, because it does not support Dart 2. Until this is resolved, the package will receive a health and maintenance score of 0.

Analysis issues and suggestions

Fix dependencies in pubspec.yaml.

Running pub upgrade failed with the following output:

ERR: The current Dart SDK version is 2.1.0.
 Because angel_framework >=0.0.0-dev.1 <1.1.3 requires SDK version <2.0.0 and angel_framework >=1.1.3 <2.0.0-alpha depends on container ^0.1.2, angel_framework >=0.0.0-dev.1 <2.0.0-alpha requires container ^0.1.2.
 So, because container >=0.1.1 requires SDK version >=1.8.0 <2.0.0 and angel_cache depends on angel_framework ^1.0.0-dev, version solving failed.

Health suggestions

Format lib/angel_cache.dart.

Run dartfmt to format lib/angel_cache.dart.

Format lib/src/cache.dart.

Run dartfmt to format lib/src/cache.dart.

Format lib/src/serializer.dart.

Run dartfmt to format lib/src/serializer.dart.

Format lib/src/util.dart.

Run dartfmt to format lib/src/util.dart.

Maintenance issues and suggestions

Fix platform conflicts. (-20 points)

Error(s) prevent platform classification:

Fix dependencies in pubspec.yaml.

Make sure dartdoc successfully runs on your package's source files. (-10 points)

Dependencies were not resolved.

The package description is too short. (-19 points)

Add more detail to the description field of pubspec.yaml. Use 60 to 180 characters to describe the package, what it does, and its target use case.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=1.19.0 <3.0.0