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 "base/strings/string_util.h"
  12 #include "net/http/http_response_headers.h"
  13 #include "net/http/http_util.h"
  14 #include "net/spdy/spdy_http_utils.h"
  15
  16 using base::FilePath;
  17 using base::IntToString;
  18 using base::StringPiece;
  19 using std::string;
  20
  21 namespace net {
  22 namespace tools {
  23
  24 QuicInMemoryCache::Response::Response() : response_type_(REGULAR_RESPONSE) {}
  25
  26 QuicInMemoryCache::Response::~Response() {}
  27
  28 // static
  29 QuicInMemoryCache* QuicInMemoryCache::GetInstance() {
  30   return Singleton<QuicInMemoryCache>::get();
  31 }
  32
  33 const QuicInMemoryCache::Response* QuicInMemoryCache::GetResponse(
  34     StringPiece host,
  35     StringPiece path) const {
  36   ResponseMap::const_iterator it = responses_.find(GetKey(host, path));
  37   if (it == responses_.end()) {
  38     if (default_response_.get()) {
  39       return default_response_.get();
  40     }
  41     return nullptr;
  42   }
  43   return it->second;
  44 }
  45
  46 void QuicInMemoryCache::AddSimpleResponse(StringPiece host,
  47                                           StringPiece path,
  48                                           int response_code,
  49                                           StringPiece response_detail,
  50                                           StringPiece body) {
  51   SpdyHeaderBlock response_headers;
  52   response_headers[":version"] = "HTTP/1.1";
  53   string status = IntToString(response_code) + " ";
  54   response_detail.AppendToString(&status);
  55   response_headers[":status"] = status;
  56   response_headers["content-length"] =
  57       IntToString(static_cast<int>(body.length()));
  58   AddResponse(host, path, response_headers, body);
  59 }
  60
  61 void QuicInMemoryCache::AddDefaultResponse(Response* response) {
  62   default_response_.reset(response);
  63 }
  64
  65 void QuicInMemoryCache::AddResponse(StringPiece host,
  66                                     StringPiece path,
  67                                     const SpdyHeaderBlock& response_headers,
  68                                     StringPiece response_body) {
  69   AddResponseImpl(host, path, REGULAR_RESPONSE, response_headers,
  70                   response_body);
  71 }
  72
  73 void QuicInMemoryCache::AddSpecialResponse(StringPiece host,
  74                                            StringPiece path,
  75                                            SpecialResponseType response_type) {
  76   AddResponseImpl(host, path, response_type, SpdyHeaderBlock(), "");
  77 }
  78
  79 QuicInMemoryCache::QuicInMemoryCache() {}
  80
  81 void QuicInMemoryCache::ResetForTests() {
  82   STLDeleteValues(&responses_);
  83 }
  84
  85 void QuicInMemoryCache::InitializeFromDirectory(const string& cache_directory) {
  86   if (cache_directory.empty()) {
  87     LOG(DFATAL) << "cache_directory must not be empty.";
  88     return;
  89   }
  90   VLOG(1) << "Attempting to initialize QuicInMemoryCache from directory: "
  91           << cache_directory;
  92   FilePath directory(FilePath::FromUTF8Unsafe(cache_directory));
  93   base::FileEnumerator file_list(directory,
  94                                  true,
  95                                  base::FileEnumerator::FILES);
  96
  97   for (FilePath file_iter = file_list.Next(); !file_iter.empty();
  98        file_iter = file_list.Next()) {
  99     // Need to skip files in .svn directories
 100     if (file_iter.value().find(FILE_PATH_LITERAL("/.svn/")) != string::npos) {
 101       continue;
 102     }
 103
 104     // Tease apart filename into host and path.
 105     string file = file_iter.AsUTF8Unsafe();
 106     file.erase(0, cache_directory.length());
 107     if (file[0] == '/') {
 108       file.erase(0, 1);
 109     }
 110
 111     string file_contents;
 112     base::ReadFileToString(file_iter, &file_contents);
 113     int file_len = static_cast<int>(file_contents.length());
 114     int headers_end = HttpUtil::LocateEndOfHeaders(file_contents.data(),
 115                                                    file_len);
 116     if (headers_end < 1) {
 117       LOG(DFATAL) << "Headers invalid or empty, ignoring: " << file;
 118       continue;
 119     }
 120
 121     string raw_headers =
 122         HttpUtil::AssembleRawHeaders(file_contents.data(), headers_end);
 123
 124     scoped_refptr<HttpResponseHeaders> response_headers =
 125         new HttpResponseHeaders(raw_headers);
 126
 127     string base;
 128     if (response_headers->GetNormalizedHeader("X-Original-Url", &base)) {
 129       response_headers->RemoveHeader("X-Original-Url");
 130       // Remove the protocol so we can add it below.
 131       if (base::StartsWith(base, "https://",
 132                            base::CompareCase::INSENSITIVE_ASCII)) {
 133         base = base.substr(8);
 134       } else if (base::StartsWith(base, "http://",
 135                                   base::CompareCase::INSENSITIVE_ASCII)) {
 136         base = base.substr(7);
 137       }
 138     } else {
 139       base = file;
 140     }
 141
 142     size_t path_start = base.find_first_of('/');
 143     StringPiece host(StringPiece(base).substr(0, path_start));
 144     StringPiece path(StringPiece(base).substr(path_start));
 145     if (path[path.length() - 1] == ',') {
 146       path.remove_suffix(1);
 147     }
 148
 149     StringPiece body(file_contents.data() + headers_end,
 150                      file_contents.size() - headers_end);
 151     // QUIC_VERSION_24 and below use SPDY/3 headers, which includes the
 152     // status reason in :status, and "HTTP/1.1" in :version. Since this
 153     // format is a strict superset of SPDY/4 headers, the cache uses this
 154     // format to store response. Once SPDY/3 responses are no longer
 155     // required, the cache can store SPDY/4 headers.
 156     SpdyHeaderBlock header_block;
 157     CreateSpdyHeadersFromHttpResponse(*response_headers, SPDY3, &header_block);
 158     AddResponse(host, path, header_block, body);
 159   }
 160 }
 161
 162 QuicInMemoryCache::~QuicInMemoryCache() {
 163   STLDeleteValues(&responses_);
 164 }
 165
 166 void QuicInMemoryCache::AddResponseImpl(
 167     StringPiece host,
 168     StringPiece path,
 169     SpecialResponseType response_type,
 170     const SpdyHeaderBlock& response_headers,
 171     StringPiece response_body) {
 172   string key = GetKey(host, path);
 173   VLOG(1) << "Adding response for: " << key;
 174   if (ContainsKey(responses_, key)) {
 175     LOG(DFATAL) << "Response for '" << key << "' already exists!";
 176     return;
 177   }
 178   Response* new_response = new Response();
 179   new_response->set_response_type(response_type);
 180   new_response->set_headers(response_headers);
 181   new_response->set_body(response_body);
 182   responses_[key] = new_response;
 183 }
 184
 185 string QuicInMemoryCache::GetKey(StringPiece host, StringPiece path) const {
 186   return host.as_string() + path.as_string();
 187 }
 188
 189 }  // namespace tools
 190 }  // namespace net