src/net/tools/quic/quic_in_memory_cache.cc

   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 #include "net/tools/quic/quic_in_memory_cache.h"
   6
   7 #include "base/files/file_enumerator.h"
   8 #include "base/files/file_util.h"
   9 #include "base/stl_util.h"
  10 #include "base/strings/string_number_conversions.h"
  11 #include "net/tools/balsa/balsa_headers.h"
  12
  13 using base::FilePath;
  14 using base::StringPiece;
  15 using std::string;
  16
  17 // Specifies the directory used during QuicInMemoryCache
  18 // construction to seed the cache. Cache directory can be
  19 // generated using `wget -p --save-headers <url>
  20
  21 namespace net {
  22 namespace tools {
  23
  24 std::string FLAGS_quic_in_memory_cache_dir = "";
  25
  26 namespace {
  27
  28 // BalsaVisitor implementation (glue) which caches response bodies.
  29 class CachingBalsaVisitor : public NoOpBalsaVisitor {
  30  public:
  31   CachingBalsaVisitor() : done_framing_(false) {}
  32   void ProcessBodyData(const char* input, size_t size) override {
  33     AppendToBody(input, size);
  34   }
  35   void MessageDone() override { done_framing_ = true; }
  36   void HandleHeaderError(BalsaFrame* framer) override { UnhandledError(); }
  37   void HandleHeaderWarning(BalsaFrame* framer) override { UnhandledError(); }
  38   void HandleChunkingError(BalsaFrame* framer) override { UnhandledError(); }
  39   void HandleBodyError(BalsaFrame* framer) override { UnhandledError(); }
  40   void UnhandledError() {
  41     LOG(DFATAL) << "Unhandled error framing HTTP.";
  42   }
  43   void AppendToBody(const char* input, size_t size) {
  44     body_.append(input, size);
  45   }
  46   bool done_framing() const { return done_framing_; }
  47   const string& body() const { return body_; }
  48
  49  private:
  50   bool done_framing_;
  51   string body_;
  52 };
  53
  54 }  // namespace
  55
  56 // static
  57 QuicInMemoryCache* QuicInMemoryCache::GetInstance() {
  58   return Singleton<QuicInMemoryCache>::get();
  59 }
  60
  61 const QuicInMemoryCache::Response* QuicInMemoryCache::GetResponse(
  62     const BalsaHeaders& request_headers) const {
  63   ResponseMap::const_iterator it = responses_.find(GetKey(request_headers));
  64   if (it == responses_.end()) {
  65     return nullptr;
  66   }
  67   return it->second;
  68 }
  69
  70 void QuicInMemoryCache::AddSimpleResponse(StringPiece method,
  71                                           StringPiece path,
  72                                           StringPiece version,
  73                                           StringPiece response_code,
  74                                           StringPiece response_detail,
  75                                           StringPiece body) {
  76   BalsaHeaders request_headers, response_headers;
  77   request_headers.SetRequestFirstlineFromStringPieces(method,
  78                                                       path,
  79                                                       version);
  80   response_headers.SetRequestFirstlineFromStringPieces(version,
  81                                                        response_code,
  82                                                        response_detail);
  83   response_headers.AppendHeader("content-length",
  84                                 base::IntToString(body.length()));
  85
  86   AddResponse(request_headers, response_headers, body);
  87 }
  88
  89 void QuicInMemoryCache::AddResponse(const BalsaHeaders& request_headers,
  90                                     const BalsaHeaders& response_headers,
  91                                     StringPiece response_body) {
  92   VLOG(1) << "Adding response for: " << GetKey(request_headers);
  93   if (ContainsKey(responses_, GetKey(request_headers))) {
  94     LOG(DFATAL) << "Response for given request already exists!";
  95     return;
  96   }
  97   Response* new_response = new Response();
  98   new_response->set_headers(response_headers);
  99   new_response->set_body(response_body);
 100   responses_[GetKey(request_headers)] = new_response;
 101 }
 102
 103 void QuicInMemoryCache::AddSpecialResponse(StringPiece method,
 104                                            StringPiece path,
 105                                            StringPiece version,
 106                                            SpecialResponseType response_type) {
 107   BalsaHeaders request_headers, response_headers;
 108   request_headers.SetRequestFirstlineFromStringPieces(method,
 109                                                       path,
 110                                                       version);
 111   AddResponse(request_headers, response_headers, "");
 112   responses_[GetKey(request_headers)]->response_type_ = response_type;
 113 }
 114
 115 QuicInMemoryCache::QuicInMemoryCache() {
 116   Initialize();
 117 }
 118
 119 void QuicInMemoryCache::ResetForTests() {
 120   STLDeleteValues(&responses_);
 121   Initialize();
 122 }
 123
 124 void QuicInMemoryCache::Initialize() {
 125   // If there's no defined cache dir, we have no initialization to do.
 126   if (FLAGS_quic_in_memory_cache_dir.empty()) {
 127     VLOG(1) << "No cache directory found. Skipping initialization.";
 128     return;
 129   }
 130   VLOG(1) << "Attempting to initialize QuicInMemoryCache from directory: "
 131           << FLAGS_quic_in_memory_cache_dir;
 132
 133   FilePath directory(FLAGS_quic_in_memory_cache_dir);
 134   base::FileEnumerator file_list(directory,
 135                                  true,
 136                                  base::FileEnumerator::FILES);
 137
 138   FilePath file = file_list.Next();
 139   while (!file.empty()) {
 140     // Need to skip files in .svn directories
 141     if (file.value().find("/.svn/") != std::string::npos) {
 142       file = file_list.Next();
 143       continue;
 144     }
 145
 146     BalsaHeaders request_headers, response_headers;
 147
 148     string file_contents;
 149     base::ReadFileToString(file, &file_contents);
 150
 151     // Frame HTTP.
 152     CachingBalsaVisitor caching_visitor;
 153     BalsaFrame framer;
 154     framer.set_balsa_headers(&response_headers);
 155     framer.set_balsa_visitor(&caching_visitor);
 156     size_t processed = 0;
 157     while (processed < file_contents.length() &&
 158            !caching_visitor.done_framing()) {
 159       processed += framer.ProcessInput(file_contents.c_str() + processed,
 160                                        file_contents.length() - processed);
 161     }
 162
 163     if (!caching_visitor.done_framing()) {
 164       LOG(DFATAL) << "Did not frame entire message from file: " << file.value()
 165                   << " (" << processed << " of " << file_contents.length()
 166                   << " bytes).";
 167     }
 168     if (processed < file_contents.length()) {
 169       // Didn't frame whole file. Assume remainder is body.
 170       // This sometimes happens as a result of incompatibilities between
 171       // BalsaFramer and wget's serialization of HTTP sans content-length.
 172       caching_visitor.AppendToBody(file_contents.c_str() + processed,
 173                                    file_contents.length() - processed);
 174       processed += file_contents.length();
 175     }
 176
 177     StringPiece base = file.value();
 178     if (response_headers.HasHeader("X-Original-Url")) {
 179       base = response_headers.GetHeader("X-Original-Url");
 180       response_headers.RemoveAllOfHeader("X-Original-Url");
 181       // Remove the protocol so that the string is of the form host + path,
 182       // which is parsed properly below.
 183       if (StringPieceUtils::StartsWithIgnoreCase(base, "https://")) {
 184         base.remove_prefix(8);
 185       } else if (StringPieceUtils::StartsWithIgnoreCase(base, "http://")) {
 186         base.remove_prefix(7);
 187       }
 188     }
 189     int path_start = base.find_first_of('/');
 190     DCHECK_LT(0, path_start);
 191     StringPiece host(base.substr(0, path_start));
 192     StringPiece path(base.substr(path_start));
 193     if (path[path.length() - 1] == ',') {
 194       path.remove_suffix(1);
 195     }
 196     // Set up request headers. Assume method is GET and protocol is HTTP/1.1.
 197     request_headers.SetRequestFirstlineFromStringPieces("GET",
 198                                                         path,
 199                                                         "HTTP/1.1");
 200     request_headers.ReplaceOrAppendHeader("host", host);
 201
 202     VLOG(1) << "Inserting 'http://" << GetKey(request_headers)
 203             << "' into QuicInMemoryCache.";
 204
 205     AddResponse(request_headers, response_headers, caching_visitor.body());
 206
 207     file = file_list.Next();
 208   }
 209 }
 210
 211 QuicInMemoryCache::~QuicInMemoryCache() {
 212   STLDeleteValues(&responses_);
 213 }
 214
 215 string QuicInMemoryCache::GetKey(const BalsaHeaders& request_headers) const {
 216   StringPiece uri = request_headers.request_uri();
 217   if (uri.size() == 0) {
 218     return "";
 219   }
 220   StringPiece host;
 221   if (uri[0] == '/') {
 222     host = request_headers.GetHeader("host");
 223   } else if (StringPieceUtils::StartsWithIgnoreCase(uri, "https://")) {
 224     uri.remove_prefix(8);
 225   } else if (StringPieceUtils::StartsWithIgnoreCase(uri, "http://")) {
 226     uri.remove_prefix(7);
 227   }
 228   return host.as_string() + uri.as_string();
 229 }
 230
 231 }  // namespace tools
 232 }  // namespace net