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Side by Side Diff: net/url_request/sdch_dictionary_fetcher.h

Issue 992733002: Remove //net (except for Android test stuff) and sdch (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 5 years, 9 months ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 // TODO(rdsmith): This class needs to delegate URLRequest::Delegate methods
6 // to the net/ embedder for correct implementation of authentication.
7 // Specifically, this class needs the embedder to provide functionality
8 // corresponding to
9 // URLRequest::Delegate::{OnAuthRequired,OnCertificateRequested}.
10
11 #ifndef NET_URL_REQUEST_SDCH_DICTIONARY_FETCHER_H_
12 #define NET_URL_REQUEST_SDCH_DICTIONARY_FETCHER_H_
13
14 #include <queue>
15 #include <set>
16 #include <string>
17
18 #include "base/macros.h"
19 #include "base/memory/ref_counted.h"
20 #include "base/memory/scoped_ptr.h"
21 #include "base/memory/weak_ptr.h"
22 #include "base/threading/non_thread_safe.h"
23 #include "net/base/sdch_manager.h"
24 #include "net/url_request/url_fetcher_delegate.h"
25 #include "net/url_request/url_request.h"
26 #include "url/gurl.h"
27
28 namespace net {
29
30 class BoundNetLog;
31 class URLRequest;
32 class URLRequestThrottlerEntryInterface;
33
34 // This class is used by embedder SDCH policy object to fetch
35 // dictionaries. It queues requests for dictionaries and dispatches
36 // them serially, implementing the URLRequest::Delegate interface to
37 // handle callbacks (but see above TODO). It tracks all requests, only
38 // attempting to fetch each dictionary once.
39 class NET_EXPORT SdchDictionaryFetcher : public URLRequest::Delegate,
40 public base::NonThreadSafe {
41 public:
42 typedef base::Callback<void(const std::string& dictionary_text,
43 const GURL& dictionary_url,
44 const BoundNetLog& net_log)>
45 OnDictionaryFetchedCallback;
46
47 // The consumer must guarantee that |*context| outlives this object.
48 // |callback| will be called on successful dictionary fetch
49 // requested through Schedule(). |callback| will not be called
50 // after object destruction.
51 SdchDictionaryFetcher(URLRequestContext* context,
52 const OnDictionaryFetchedCallback& callback);
53 ~SdchDictionaryFetcher() override;
54
55 // Request a new dictionary fetch.
56 void Schedule(const GURL& dictionary_url);
57
58 // Cancel any in-progress requests.
59 void Cancel();
60
61 // Implementation of URLRequest::Delegate methods.
62 void OnResponseStarted(URLRequest* request) override;
63 void OnReadCompleted(URLRequest* request, int bytes_read) override;
64
65 private:
66 enum State {
67 STATE_NONE,
68 STATE_SEND_REQUEST,
69 STATE_SEND_REQUEST_COMPLETE,
70 STATE_READ_BODY,
71 STATE_READ_BODY_COMPLETE,
72 STATE_REQUEST_COMPLETE,
73 };
74
75 // State machine implementation.
76 int DoLoop(int rv);
77 int DoSendRequest(int rv);
78 int DoSendRequestComplete(int rv);
79 int DoReadBody(int rv);
80 int DoReadBodyComplete(int rv);
81 int DoCompleteRequest(int rv);
82
83 State next_state_;
84 bool in_loop_;
85
86 // A queue of URLs that are being used to download dictionaries.
87 std::queue<GURL> fetch_queue_;
88
89 // The request and buffer used for getting the current dictionary
90 // Both are null when a fetch is not in progress.
91 scoped_ptr<URLRequest> current_request_;
92 scoped_refptr<IOBuffer> buffer_;
93
94 // The currently accumulating dictionary.
95 std::string dictionary_;
96
97 // Althought the SDCH spec does not preclude a server from using a single URL
98 // to load several distinct dictionaries (by telling a client to load a
99 // dictionary from an URL several times), current implementations seem to have
100 // that 1-1 relationship (i.e., each URL points at a single dictionary, and
101 // the dictionary content does not change over time, and hence is not worth
102 // trying to load more than once). In addition, some dictionaries prove
103 // unloadable only after downloading them (because they are too large? ...or
104 // malformed?). As a protective element, Chromium will *only* load a
105 // dictionary at most once from a given URL (so that it doesn't waste
106 // bandwidth trying repeatedly).
107 // The following set lists all the dictionary URLs that we've tried to load,
108 // so that we won't try to load from an URL more than once.
109 // TODO(jar): Try to augment the SDCH proposal to include this restiction.
110 std::set<GURL> attempted_load_;
111
112 // Store the URLRequestContext associated with the owning SdchManager for
113 // use while fetching.
114 URLRequestContext* const context_;
115
116 const OnDictionaryFetchedCallback dictionary_fetched_callback_;
117
118 base::WeakPtrFactory<SdchDictionaryFetcher> weak_factory_;
119
120 DISALLOW_COPY_AND_ASSIGN(SdchDictionaryFetcher);
121 };
122
123 } // namespace net
124
125 #endif // NET_URL_REQUEST_SDCH_DICTIONARY_FETCHER_H_
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