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// Copyright (c) 2012 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.
#ifndef NET_TOOLS_QUIC_QUIC_IN_MEMORY_CACHE_H_
#define NET_TOOLS_QUIC_QUIC_IN_MEMORY_CACHE_H_
#include <string>
#include "base/containers/hash_tables.h"
#include "base/memory/singleton.h"
#include "base/strings/string_piece.h"
#include "net/tools/balsa/balsa_frame.h"
#include "net/tools/balsa/balsa_headers.h"
#include "net/tools/balsa/noop_balsa_visitor.h"
template <typename T> struct DefaultSingletonTraits;
namespace net {
namespace tools {
namespace test {
class QuicInMemoryCachePeer;
} // namespace
extern std::string FLAGS_quic_in_memory_cache_dir;
class QuicServer;
// In-memory cache for HTTP responses.
// Reads from disk cache generated by:
// `wget -p --save_headers <url>`
class QuicInMemoryCache {
public:
enum SpecialResponseType {
REGULAR_RESPONSE, // Send the headers and body like a server should.
CLOSE_CONNECTION, // Close the connection (sending the close packet).
IGNORE_REQUEST, // Do nothing, expect the client to time out.
};
// Container for response header/body pairs.
class Response {
public:
Response() : response_type_(REGULAR_RESPONSE) {}
~Response() {}
const SpecialResponseType response_type() const { return response_type_; }
const BalsaHeaders& headers() const { return headers_; }
const base::StringPiece body() const { return base::StringPiece(body_); }
private:
friend class QuicInMemoryCache;
void set_headers(const BalsaHeaders& headers) {
headers_.CopyFrom(headers);
}
void set_body(base::StringPiece body) {
body.CopyToString(&body_);
}
SpecialResponseType response_type_;
BalsaHeaders headers_;
std::string body_;
DISALLOW_COPY_AND_ASSIGN(Response);
};
// Returns the singleton instance of the cache.
static QuicInMemoryCache* GetInstance();
// Retrieve a response from this cache for a given request.
// If no appropriate response exists, NULL is returned.
// Currently, responses are selected based on request URI only.
const Response* GetResponse(const BalsaHeaders& request_headers) const;
// Adds a simple response to the cache. The response headers will
// only contain the "content-length" header with the lenght of |body|.
void AddSimpleResponse(base::StringPiece method,
base::StringPiece path,
base::StringPiece version,
base::StringPiece response_code,
base::StringPiece response_detail,
base::StringPiece body);
// Add a response to the cache.
void AddResponse(const BalsaHeaders& request_headers,
const BalsaHeaders& response_headers,
base::StringPiece response_body);
// Simulate a special behavior at a particular path.
void AddSpecialResponse(base::StringPiece method,
base::StringPiece path,
base::StringPiece version,
SpecialResponseType response_type);
private:
typedef base::hash_map<std::string, Response*> ResponseMap;
friend struct DefaultSingletonTraits<QuicInMemoryCache>;
friend class test::QuicInMemoryCachePeer;
QuicInMemoryCache();
~QuicInMemoryCache();
void ResetForTests();
void Initialize();
std::string GetKey(const BalsaHeaders& response_headers) const;
// Cached responses.
ResponseMap responses_;
DISALLOW_COPY_AND_ASSIGN(QuicInMemoryCache);
};
} // namespace tools
} // namespace net
#endif // NET_TOOLS_QUIC_QUIC_IN_MEMORY_CACHE_H_
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