net/tools/quic/quic_in_memory_cache.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 NET_TOOLS_QUIC_QUIC_IN_MEMORY_CACHE_H_
   6 #define NET_TOOLS_QUIC_QUIC_IN_MEMORY_CACHE_H_
   7
   8 #include <string>
   9
  10 #include "base/containers/hash_tables.h"
  11 #include "base/memory/singleton.h"
  12 #include "base/strings/string_piece.h"
  13 #include "net/tools/flip_server/balsa_frame.h"
  14 #include "net/tools/flip_server/balsa_headers.h"
  15
  16 template <typename T> struct DefaultSingletonTraits;
  17
  18 namespace net {
  19 namespace tools {
  20
  21 extern std::string FLAGS_quic_in_memory_cache_dir;
  22
  23 class QuicServer;
  24
  25 // In-memory cache for HTTP responses.
  26 // Reads from disk cache generated by:
  27 // `wget -p --save_headers <url>`
  28 class QuicInMemoryCache {
  29  public:
  30   // Container for response header/body pairs.
  31   class Response {
  32    public:
  33     Response() {}
  34     ~Response() {}
  35
  36     const BalsaHeaders& headers() const { return headers_; }
  37     const base::StringPiece body() const { return base::StringPiece(body_); }
  38
  39    private:
  40     friend class QuicInMemoryCache;
  41
  42     void set_headers(const BalsaHeaders& headers) {
  43       headers_.CopyFrom(headers);
  44     }
  45     void set_body(base::StringPiece body) {
  46       body.CopyToString(&body_);
  47     }
  48
  49     BalsaHeaders headers_;
  50     std::string body_;
  51
  52     DISALLOW_COPY_AND_ASSIGN(Response);
  53   };
  54   static QuicInMemoryCache* GetInstance();
  55
  56   // Retrieve a response from this cache for a given request.
  57   // If no appropriate response exists, NULL is returned.
  58   // Currently, responses are selected based on request URI only.
  59   const Response* GetResponse(const BalsaHeaders& request_headers) const;
  60
  61   // Add a response to the cache.
  62   void AddResponse(const BalsaHeaders& request_headers,
  63                    const BalsaHeaders& response_headers,
  64                    base::StringPiece response_body);
  65
  66   void ResetForTests();
  67
  68  private:
  69   typedef base::hash_map<std::string, Response*> ResponseMap;
  70
  71
  72   QuicInMemoryCache();
  73   friend struct DefaultSingletonTraits<QuicInMemoryCache>;
  74   ~QuicInMemoryCache();
  75
  76   void Initialize();
  77   std::string GetKey(const BalsaHeaders& response_headers) const;
  78
  79   // Cached responses.
  80   ResponseMap responses_;
  81
  82   DISALLOW_COPY_AND_ASSIGN(QuicInMemoryCache);
  83 };
  84
  85 }  // namespace tools
  86 }  // namespace net
  87
  88 #endif  // NET_TOOLS_QUIC_QUIC_IN_MEMORY_CACHE_H_