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ResponseCache.ifModifiedSince

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This commit is contained in:
Tobe O 2018-04-01 21:24:13 -04:00
parent b64bebf18f
commit 4a8d9ee31e
2 changed files with 24 additions and 13 deletions
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1
lib/angel_cache.dart
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@ -1,2 +1,3 @@
export 'src/cache.dart';
export 'src/cache_service.dart';
export 'src/serializer.dart';

24
lib/src/cache.dart
View file

@ -14,18 +14,25 @@ class ResponseCache {
ResponseCache({this.timeout});
Future<bool> handleRequest(RequestContext req, ResponseContext res) async {
var now = new DateTime.now().toUtc();
/// A middleware that handles requests with an `If-Modified-Since` header.
///
/// This prevents the server from even having to access the cache, and plays very well with static assets.
Future<bool> ifModifiedSince(RequestContext req, ResponseContext res) async {
if (req.headers.value('if-modified-since') != null) {
var modifiedSince = _fmt.parse(req.headers.value('if-modified-since'));
// Check if there is a cache entry.
for (var pattern in patterns) {
if (pattern.allMatches(req.uri.path).isNotEmpty && _cache.containsKey(req.uri.path)) {
if (pattern.allMatches(req.uri.path).isNotEmpty &&
_cache.containsKey(req.uri.path)) {
var response = _cache[req.uri.path];
// Only send a cached response if it is valid.
if (timeout == null || now.difference(response.timestamp) >= timeout) {
// TODO: If-Last-Modified
break;
if (timeout == null ||
modifiedSince.difference(response.timestamp) >= timeout) {
res.statusCode = 304;
return false;
}
}
}
}
@ -33,7 +40,10 @@ class ResponseCache {
return true;
}
Future<bool> responseFinalizer(RequestContext req, ResponseContext res) async {
Future<bool> responseFinalizer(
RequestContext req, ResponseContext res) async {
if (res.statusCode == 304) return true;
var now = new DateTime.now().toUtc();
}