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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This file declares a HttpTransactionFactory implementation that can be
// layered on top of another HttpTransactionFactory to add HTTP caching. The
// caching logic follows RFC 2616 (any exceptions are called out in the code).
//
// The HttpCache takes a disk_cache::Backend as a parameter, and uses that for
// the cache storage.
//
// See HttpTransactionFactory and HttpTransaction for more details.
#ifndef NET_HTTP_HTTP_CACHE_H_
#define NET_HTTP_HTTP_CACHE_H_
#include <list>
#include <set>
#include "base/basictypes.h"
#include "base/hash_tables.h"
#include "base/scoped_ptr.h"
#include "base/task.h"
#include "base/weak_ptr.h"
#include "net/base/cache_type.h"
#include "net/http/http_transaction_factory.h"
namespace disk_cache {
class Backend;
class Entry;
}
namespace net {
class HostResolver;
class HttpNetworkSession;
class HttpRequestInfo;
class HttpResponseInfo;
class ProxyService;
class SSLConfigService;
class HttpCache : public HttpTransactionFactory,
public base::SupportsWeakPtr<HttpCache> {
public:
~HttpCache();
// The cache mode of operation.
enum Mode {
// Normal mode just behaves like a standard web cache.
NORMAL = 0,
// Record mode caches everything for purposes of offline playback.
RECORD,
// Playback mode replays from a cache without considering any
// standard invalidations.
PLAYBACK,
// Disables reads and writes from the cache.
// Equivalent to setting LOAD_DISABLE_CACHE on every request.
DISABLE
};
// Initialize the cache from the directory where its data is stored. The
// disk cache is initialized lazily (by CreateTransaction) in this case. If
// |cache_size| is zero, a default value will be calculated automatically.
HttpCache(HostResolver* host_resolver,
ProxyService* proxy_service,
SSLConfigService* ssl_config_service,
const std::wstring& cache_dir,
int cache_size);
// Initialize the cache from the directory where its data is stored. The
// disk cache is initialized lazily (by CreateTransaction) in this case. If
// |cache_size| is zero, a default value will be calculated automatically.
// Provide an existing HttpNetworkSession, the cache can construct a
// network layer with a shared HttpNetworkSession in order for multiple
// network layers to share information (e.g. authenication data).
HttpCache(HttpNetworkSession* session, const std::wstring& cache_dir,
int cache_size);
// Initialize using an in-memory cache. The cache is initialized lazily
// (by CreateTransaction) in this case. If |cache_size| is zero, a default
// value will be calculated automatically.
HttpCache(HostResolver* host_resolver,
ProxyService* proxy_service,
SSLConfigService* ssl_config_service,
int cache_size);
// Initialize the cache from its component parts, which is useful for
// testing. The lifetime of the network_layer and disk_cache are managed by
// the HttpCache and will be destroyed using |delete| when the HttpCache is
// destroyed.
HttpCache(HttpTransactionFactory* network_layer,
disk_cache::Backend* disk_cache);
HttpTransactionFactory* network_layer() { return network_layer_.get(); }
disk_cache::Backend* disk_cache() { return disk_cache_.get(); }
// HttpTransactionFactory implementation:
virtual int CreateTransaction(scoped_ptr<HttpTransaction>* trans);
virtual HttpCache* GetCache();
virtual HttpNetworkSession* GetSession();
virtual void Suspend(bool suspend);
// Helper function for reading response info from the disk cache. If the
// cache doesn't have the whole resource *|request_truncated| is set to true.
static bool ReadResponseInfo(disk_cache::Entry* disk_entry,
HttpResponseInfo* response_info,
bool* response_truncated);
// Helper function for writing response info into the disk cache. If the
// cache doesn't have the whole resource |request_truncated| should be true.
static bool WriteResponseInfo(disk_cache::Entry* disk_entry,
const HttpResponseInfo* response_info,
bool skip_transient_headers,
bool response_truncated);
// Given a header data blob, convert it to a response info object.
static bool ParseResponseInfo(const char* data, int len,
HttpResponseInfo* response_info,
bool* response_truncated);
// Get/Set the cache's mode.
void set_mode(Mode value) { mode_ = value; }
Mode mode() { return mode_; }
void set_type(CacheType type) { type_ = type; }
CacheType type() { return type_; }
// Close All Idle Sockets. This is for debugging.
void CloseIdleConnections();
void set_enable_range_support(bool value) {
enable_range_support_ = value;
}
private:
// Types --------------------------------------------------------------------
class Transaction;
friend class Transaction;
typedef std::list<Transaction*> TransactionList;
struct ActiveEntry {
disk_cache::Entry* disk_entry;
Transaction* writer;
TransactionList readers;
TransactionList pending_queue;
bool will_process_pending_queue;
bool doomed;
explicit ActiveEntry(disk_cache::Entry*);
~ActiveEntry();
};
typedef base::hash_map<std::string, ActiveEntry*> ActiveEntriesMap;
typedef std::set<ActiveEntry*> ActiveEntriesSet;
// Methods ------------------------------------------------------------------
std::string GenerateCacheKey(const HttpRequestInfo*);
void DoomEntry(const std::string& key);
void FinalizeDoomedEntry(ActiveEntry* entry);
ActiveEntry* FindActiveEntry(const std::string& key);
ActiveEntry* ActivateEntry(const std::string& key, disk_cache::Entry*);
void DeactivateEntry(ActiveEntry* entry);
void SlowDeactivateEntry(ActiveEntry* entry);
ActiveEntry* OpenEntry(const std::string& key);
ActiveEntry* CreateEntry(const std::string& cache_key);
void DestroyEntry(ActiveEntry* entry);
int AddTransactionToEntry(ActiveEntry* entry, Transaction* trans);
void DoneWithEntry(ActiveEntry* entry, Transaction* trans, bool cancel);
void DoneWritingToEntry(ActiveEntry* entry, bool success);
void DoneReadingFromEntry(ActiveEntry* entry, Transaction* trans);
void ConvertWriterToReader(ActiveEntry* entry);
void RemovePendingTransaction(Transaction* trans);
void ProcessPendingQueue(ActiveEntry* entry);
// Events (called via PostTask) ---------------------------------------------
void OnProcessPendingQueue(ActiveEntry* entry);
// Variables ----------------------------------------------------------------
// used when lazily constructing the disk_cache_
std::wstring disk_cache_dir_;
Mode mode_;
CacheType type_;
scoped_ptr<HttpTransactionFactory> network_layer_;
scoped_ptr<disk_cache::Backend> disk_cache_;
// The set of active entries indexed by cache key
ActiveEntriesMap active_entries_;
// The set of doomed entries
ActiveEntriesSet doomed_entries_;
ScopedRunnableMethodFactory<HttpCache> task_factory_;
bool in_memory_cache_;
bool enable_range_support_;
int cache_size_;
typedef base::hash_map<std::string, int> PlaybackCacheMap;
scoped_ptr<PlaybackCacheMap> playback_cache_map_;
DISALLOW_COPY_AND_ASSIGN(HttpCache);
};
} // namespace net
#endif // NET_HTTP_HTTP_CACHE_H_
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