content/browser/appcache/appcache.h

   1 // Copyright (c) 2012 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 #ifndef CONTENT_BROWSER_APPCACHE_APPCACHE_H_
   6 #define CONTENT_BROWSER_APPCACHE_APPCACHE_H_
   7
   8 #include <map>
   9 #include <set>
  10 #include <vector>
  11
  12 #include "base/gtest_prod_util.h"
  13 #include "base/memory/ref_counted.h"
  14 #include "base/time/time.h"
  15 #include "content/browser/appcache/appcache_database.h"
  16 #include "content/browser/appcache/appcache_entry.h"
  17 #include "content/browser/appcache/appcache_manifest_parser.h"
  18 #include "content/common/content_export.h"
  19 #include "url/gurl.h"
  20
  21 namespace net {
  22 class IOBuffer;
  23 }
  24
  25 namespace content {
  26 FORWARD_DECLARE_TEST(AppCacheTest, InitializeWithManifest);
  27 FORWARD_DECLARE_TEST(AppCacheTest, ToFromDatabaseRecords);
  28 class AppCacheExecutableHandler;
  29 class AppCacheGroup;
  30 class AppCacheHost;
  31 class AppCacheStorage;
  32 class AppCacheTest;
  33 class AppCacheStorageImplTest;
  34 class AppCacheUpdateJobTest;
  35
  36 // Set of cached resources for an application. A cache exists as long as a
  37 // host is associated with it, the cache is in an appcache group or the
  38 // cache is being created during an appcache upate.
  39 class CONTENT_EXPORT AppCache
  40     : public base::RefCounted<AppCache> {
  41  public:
  42   typedef std::map<GURL, AppCacheEntry> EntryMap;
  43   typedef std::set<AppCacheHost*> AppCacheHosts;
  44
  45   AppCache(AppCacheStorage* storage, int64 cache_id);
  46
  47   int64 cache_id() const { return cache_id_; }
  48
  49   AppCacheGroup* owning_group() const { return owning_group_.get(); }
  50
  51   bool is_complete() const { return is_complete_; }
  52   void set_complete(bool value) { is_complete_ = value; }
  53
  54   // Adds a new entry. Entry must not already be in cache.
  55   void AddEntry(const GURL& url, const AppCacheEntry& entry);
  56
  57   // Adds a new entry or modifies an existing entry by merging the types
  58   // of the new entry with the existing entry. Returns true if a new entry
  59   // is added, false if the flags are merged into an existing entry.
  60   bool AddOrModifyEntry(const GURL& url, const AppCacheEntry& entry);
  61
  62   // Removes an entry from the EntryMap, the URL must be in the set.
  63   void RemoveEntry(const GURL& url);
  64
  65   // Do not store or delete the returned ptr, they're owned by 'this'.
  66   AppCacheEntry* GetEntry(const GURL& url);
  67   const AppCacheEntry* GetEntryWithResponseId(int64 response_id) {
  68     return GetEntryAndUrlWithResponseId(response_id, NULL);
  69   }
  70   const AppCacheEntry* GetEntryAndUrlWithResponseId(
  71       int64 response_id, GURL* optional_url);
  72   const EntryMap& entries() const { return entries_; }
  73
  74   // The AppCache owns the collection of executable handlers that have
  75   // been started for this instance. The getter looks up an existing
  76   // handler returning null if not found, the GetOrCreate method will
  77   // cons one up if not found.
  78   // Do not store the returned ptrs, they're owned by 'this'.
  79   AppCacheExecutableHandler* GetExecutableHandler(int64 response_id);
  80   AppCacheExecutableHandler* GetOrCreateExecutableHandler(
  81       int64 response_id, net::IOBuffer* handler_source);
  82
  83   // Returns the URL of the resource used as entry for 'namespace_url'.
  84   GURL GetFallbackEntryUrl(const GURL& namespace_url) const {
  85     return GetNamespaceEntryUrl(fallback_namespaces_, namespace_url);
  86   }
  87   GURL GetInterceptEntryUrl(const GURL& namespace_url) const {
  88     return GetNamespaceEntryUrl(intercept_namespaces_, namespace_url);
  89   }
  90
  91   AppCacheHosts& associated_hosts() { return associated_hosts_; }
  92
  93   bool IsNewerThan(AppCache* cache) const {
  94     // TODO(michaeln): revisit, the system clock can be set
  95     // back in time which would confuse this logic.
  96     if (update_time_ > cache->update_time_)
  97       return true;
  98
  99     // Tie breaker. Newer caches have a larger cache ID.
 100     if (update_time_ == cache->update_time_)
 101       return cache_id_ > cache->cache_id_;
 102
 103     return false;
 104   }
 105
 106   base::Time update_time() const { return update_time_; }
 107
 108   int64 cache_size() const { return cache_size_; }
 109
 110   void set_update_time(base::Time ticks) { update_time_ = ticks; }
 111
 112   // Initializes the cache with information in the manifest.
 113   // Do not use the manifest after this call.
 114   void InitializeWithManifest(Manifest* manifest);
 115
 116   // Initializes the cache with the information in the database records.
 117   void InitializeWithDatabaseRecords(
 118       const AppCacheDatabase::CacheRecord& cache_record,
 119       const std::vector<AppCacheDatabase::EntryRecord>& entries,
 120       const std::vector<AppCacheDatabase::NamespaceRecord>& intercepts,
 121       const std::vector<AppCacheDatabase::NamespaceRecord>& fallbacks,
 122       const std::vector<AppCacheDatabase::OnlineWhiteListRecord>& whitelists);
 123
 124   // Returns the database records to be stored in the AppCacheDatabase
 125   // to represent this cache.
 126   void ToDatabaseRecords(
 127       const AppCacheGroup* group,
 128       AppCacheDatabase::CacheRecord* cache_record,
 129       std::vector<AppCacheDatabase::EntryRecord>* entries,
 130       std::vector<AppCacheDatabase::NamespaceRecord>* intercepts,
 131       std::vector<AppCacheDatabase::NamespaceRecord>* fallbacks,
 132       std::vector<AppCacheDatabase::OnlineWhiteListRecord>* whitelists);
 133
 134   bool FindResponseForRequest(const GURL& url,
 135       AppCacheEntry* found_entry, GURL* found_intercept_namespace,
 136       AppCacheEntry* found_fallback_entry, GURL* found_fallback_namespace,
 137       bool* found_network_namespace);
 138
 139   // Populates the 'infos' vector with an element per entry in the appcache.
 140   void ToResourceInfoVector(AppCacheResourceInfoVector* infos) const;
 141
 142   static const AppCacheNamespace* FindNamespace(
 143       const AppCacheNamespaceVector& namespaces,
 144       const GURL& url);
 145
 146  private:
 147   friend class AppCacheGroup;
 148   friend class AppCacheHost;
 149   friend class content::AppCacheTest;
 150   friend class content::AppCacheStorageImplTest;
 151   friend class content::AppCacheUpdateJobTest;
 152   friend class base::RefCounted<AppCache>;
 153
 154   ~AppCache();
 155
 156   // Use AppCacheGroup::Add/RemoveCache() to manipulate owning group.
 157   void set_owning_group(AppCacheGroup* group) { owning_group_ = group; }
 158
 159   // FindResponseForRequest helpers
 160   const AppCacheNamespace* FindInterceptNamespace(const GURL& url) {
 161     return FindNamespace(intercept_namespaces_, url);
 162   }
 163   const AppCacheNamespace* FindFallbackNamespace(const GURL& url) {
 164     return FindNamespace(fallback_namespaces_, url);
 165   }
 166   bool IsInNetworkNamespace(const GURL& url) {
 167     return FindNamespace(online_whitelist_namespaces_, url) != NULL;
 168   }
 169
 170   GURL GetNamespaceEntryUrl(const AppCacheNamespaceVector& namespaces,
 171                             const GURL& namespace_url) const;
 172
 173   // Use AppCacheHost::Associate*Cache() to manipulate host association.
 174   void AssociateHost(AppCacheHost* host) {
 175     associated_hosts_.insert(host);
 176   }
 177   void UnassociateHost(AppCacheHost* host);
 178
 179   const int64 cache_id_;
 180   scoped_refptr<AppCacheGroup> owning_group_;
 181   AppCacheHosts associated_hosts_;
 182
 183   EntryMap entries_;    // contains entries of all types
 184
 185   AppCacheNamespaceVector intercept_namespaces_;
 186   AppCacheNamespaceVector fallback_namespaces_;
 187   AppCacheNamespaceVector online_whitelist_namespaces_;
 188   bool online_whitelist_all_;
 189
 190   bool is_complete_;
 191
 192   // when this cache was last updated
 193   base::Time update_time_;
 194
 195   int64 cache_size_;
 196
 197   typedef std::map<int64, AppCacheExecutableHandler*> HandlerMap;
 198   HandlerMap executable_handlers_;
 199
 200   // to notify storage when cache is deleted
 201   AppCacheStorage* storage_;
 202
 203   FRIEND_TEST_ALL_PREFIXES(content::AppCacheTest, InitializeWithManifest);
 204   FRIEND_TEST_ALL_PREFIXES(content::AppCacheTest, ToFromDatabaseRecords);
 205   DISALLOW_COPY_AND_ASSIGN(AppCache);
 206 };
 207
 208 }  // namespace content
 209
 210 #endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_H_