mojo/services/network/url_loader_impl.cc

   1 // Copyright 2014 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 "mojo/services/network/url_loader_impl.h"
   6
   7 #include "base/memory/scoped_vector.h"
   8 #include "base/message_loop/message_loop.h"
   9 #include "mojo/common/common_type_converters.h"
  10 #include "mojo/services/network/net_adapters.h"
  11 #include "mojo/services/network/network_context.h"
  12 #include "net/base/elements_upload_data_stream.h"
  13 #include "net/base/io_buffer.h"
  14 #include "net/base/load_flags.h"
  15 #include "net/base/upload_bytes_element_reader.h"
  16 #include "net/http/http_response_headers.h"
  17 #include "net/url_request/redirect_info.h"
  18 #include "net/url_request/url_request_context.h"
  19
  20 namespace mojo {
  21 namespace {
  22
  23 // Generates an URLResponsePtr from the response state of a net::URLRequest.
  24 URLResponsePtr MakeURLResponse(const net::URLRequest* url_request) {
  25   URLResponsePtr response(URLResponse::New());
  26   response->url = String::From(url_request->url());
  27
  28   const net::HttpResponseHeaders* headers = url_request->response_headers();
  29   if (headers) {
  30     response->status_code = headers->response_code();
  31     response->status_line = headers->GetStatusLine();
  32
  33     std::vector<String> header_lines;
  34     void* iter = NULL;
  35     std::string name, value;
  36     while (headers->EnumerateHeaderLines(&iter, &name, &value))
  37       header_lines.push_back(name + ": " + value);
  38     if (!header_lines.empty())
  39       response->headers.Swap(&header_lines);
  40   }
  41
  42   std::string mime_type;
  43   url_request->GetMimeType(&mime_type);
  44   response->mime_type = mime_type;
  45
  46   std::string charset;
  47   url_request->GetCharset(&charset);
  48   response->charset = charset;
  49
  50   return response.Pass();
  51 }
  52
  53 // Reads the request body upload data from a DataPipe.
  54 class UploadDataPipeElementReader : public net::UploadElementReader {
  55  public:
  56   UploadDataPipeElementReader(ScopedDataPipeConsumerHandle pipe)
  57       : pipe_(pipe.Pass()), num_bytes_(0) {}
  58   ~UploadDataPipeElementReader() override {}
  59
  60   // UploadElementReader overrides:
  61   int Init(const net::CompletionCallback& callback) override {
  62     offset_ = 0;
  63     ReadDataRaw(pipe_.get(), NULL, &num_bytes_, MOJO_READ_DATA_FLAG_QUERY);
  64     return net::OK;
  65   }
  66   uint64 GetContentLength() const override { return num_bytes_; }
  67   uint64 BytesRemaining() const override { return num_bytes_ - offset_; }
  68   bool IsInMemory() const override { return false; }
  69   int Read(net::IOBuffer* buf,
  70            int buf_length,
  71            const net::CompletionCallback& callback) override {
  72     uint32_t bytes_read =
  73         std::min(static_cast<uint32_t>(BytesRemaining()),
  74                  static_cast<uint32_t>(buf_length));
  75     if (bytes_read > 0) {
  76       ReadDataRaw(pipe_.get(), buf->data(), &bytes_read,
  77                   MOJO_READ_DATA_FLAG_NONE);
  78     }
  79
  80     offset_ += bytes_read;
  81     return bytes_read;
  82   }
  83
  84  private:
  85   ScopedDataPipeConsumerHandle pipe_;
  86   uint32_t num_bytes_;
  87   uint32_t offset_;
  88
  89   DISALLOW_COPY_AND_ASSIGN(UploadDataPipeElementReader);
  90 };
  91
  92 }  // namespace
  93
  94 URLLoaderImpl::URLLoaderImpl(NetworkContext* context)
  95     : context_(context),
  96       response_body_buffer_size_(0),
  97       auto_follow_redirects_(true),
  98       weak_ptr_factory_(this) {
  99 }
 100
 101 URLLoaderImpl::~URLLoaderImpl() {
 102 }
 103
 104 void URLLoaderImpl::Start(URLRequestPtr request,
 105                           const Callback<void(URLResponsePtr)>& callback) {
 106   if (url_request_) {
 107     SendError(net::ERR_UNEXPECTED, callback);
 108     return;
 109   }
 110
 111   if (!request) {
 112     SendError(net::ERR_INVALID_ARGUMENT, callback);
 113     return;
 114   }
 115
 116   url_request_ = context_->url_request_context()->CreateRequest(
 117       GURL(request->url),
 118       net::DEFAULT_PRIORITY,
 119       this,
 120       NULL);
 121   url_request_->set_method(request->method);
 122   if (request->headers) {
 123     net::HttpRequestHeaders headers;
 124     for (size_t i = 0; i < request->headers.size(); ++i)
 125       headers.AddHeaderFromString(request->headers[i].To<base::StringPiece>());
 126     url_request_->SetExtraRequestHeaders(headers);
 127   }
 128   if (request->body) {
 129     ScopedVector<net::UploadElementReader> element_readers;
 130     for (size_t i = 0; i < request->body.size(); ++i) {
 131       element_readers.push_back(
 132           new UploadDataPipeElementReader(request->body[i].Pass()));
 133     }
 134     url_request_->set_upload(make_scoped_ptr<net::UploadDataStream>(
 135         new net::ElementsUploadDataStream(element_readers.Pass(), 0)));
 136   }
 137   if (request->bypass_cache)
 138     url_request_->SetLoadFlags(net::LOAD_BYPASS_CACHE);
 139
 140   callback_ = callback;
 141   response_body_buffer_size_ = request->response_body_buffer_size;
 142   auto_follow_redirects_ = request->auto_follow_redirects;
 143
 144   url_request_->Start();
 145 }
 146
 147 void URLLoaderImpl::FollowRedirect(
 148     const Callback<void(URLResponsePtr)>& callback) {
 149   if (!url_request_) {
 150     SendError(net::ERR_UNEXPECTED, callback);
 151     return;
 152   }
 153
 154   if (auto_follow_redirects_) {
 155     DLOG(ERROR) << "Spurious call to FollowRedirect";
 156     SendError(net::ERR_UNEXPECTED, callback);
 157     return;
 158   }
 159
 160   // TODO(darin): Verify that it makes sense to call FollowDeferredRedirect.
 161   url_request_->FollowDeferredRedirect();
 162 }
 163
 164 void URLLoaderImpl::QueryStatus(
 165     const Callback<void(URLLoaderStatusPtr)>& callback) {
 166   URLLoaderStatusPtr status(URLLoaderStatus::New());
 167   if (url_request_) {
 168     status->is_loading = url_request_->is_pending();
 169     if (!url_request_->status().is_success())
 170       status->error = MakeNetworkError(url_request_->status().error());
 171   } else {
 172     status->is_loading = false;
 173   }
 174   // TODO(darin): Populate more status fields.
 175   callback.Run(status.Pass());
 176 }
 177
 178 void URLLoaderImpl::OnReceivedRedirect(net::URLRequest* url_request,
 179                                        const net::RedirectInfo& redirect_info,
 180                                        bool* defer_redirect) {
 181   DCHECK(url_request == url_request_.get());
 182   DCHECK(url_request->status().is_success());
 183
 184   if (auto_follow_redirects_)
 185     return;
 186
 187   // Send the redirect response to the client, allowing them to inspect it and
 188   // optionally follow the redirect.
 189   *defer_redirect = true;
 190
 191   URLResponsePtr response = MakeURLResponse(url_request);
 192   response->redirect_method = redirect_info.new_method;
 193   response->redirect_url = String::From(redirect_info.new_url);
 194
 195   SendResponse(response.Pass());
 196 }
 197
 198 void URLLoaderImpl::OnResponseStarted(net::URLRequest* url_request) {
 199   DCHECK(url_request == url_request_.get());
 200
 201   if (!url_request->status().is_success()) {
 202     SendError(url_request->status().error(), callback_);
 203     callback_ = Callback<void(URLResponsePtr)>();
 204     return;
 205   }
 206
 207   // TODO(darin): Add support for optional MIME sniffing.
 208
 209   DataPipe data_pipe;
 210   // TODO(darin): Honor given buffer size.
 211
 212   URLResponsePtr response = MakeURLResponse(url_request);
 213   response->body = data_pipe.consumer_handle.Pass();
 214   response_body_stream_ = data_pipe.producer_handle.Pass();
 215
 216   SendResponse(response.Pass());
 217
 218   // Start reading...
 219   ReadMore();
 220 }
 221
 222 void URLLoaderImpl::OnReadCompleted(net::URLRequest* url_request,
 223                                     int bytes_read) {
 224   DCHECK(url_request == url_request_.get());
 225
 226   if (url_request->status().is_success()) {
 227     DidRead(static_cast<uint32_t>(bytes_read), false);
 228   } else {
 229     pending_write_ = NULL;  // This closes the data pipe.
 230   }
 231 }
 232
 233 void URLLoaderImpl::SendError(
 234     int error_code,
 235     const Callback<void(URLResponsePtr)>& callback) {
 236   URLResponsePtr response(URLResponse::New());
 237   if (url_request_)
 238     response->url = String::From(url_request_->url());
 239   response->error = MakeNetworkError(error_code);
 240   callback.Run(response.Pass());
 241 }
 242
 243 void URLLoaderImpl::SendResponse(URLResponsePtr response) {
 244   Callback<void(URLResponsePtr)> callback;
 245   std::swap(callback_, callback);
 246   callback.Run(response.Pass());
 247 }
 248
 249 void URLLoaderImpl::OnResponseBodyStreamReady(MojoResult result) {
 250   // TODO(darin): Handle a bad |result| value.
 251   ReadMore();
 252 }
 253
 254 void URLLoaderImpl::ReadMore() {
 255   DCHECK(!pending_write_.get());
 256
 257   uint32_t num_bytes;
 258   MojoResult result = NetToMojoPendingBuffer::BeginWrite(
 259       &response_body_stream_, &pending_write_, &num_bytes);
 260
 261   if (result == MOJO_RESULT_SHOULD_WAIT) {
 262     // The pipe is full. We need to wait for it to have more space.
 263     handle_watcher_.Start(response_body_stream_.get(),
 264                           MOJO_HANDLE_SIGNAL_WRITABLE,
 265                           MOJO_DEADLINE_INDEFINITE,
 266                           base::Bind(&URLLoaderImpl::OnResponseBodyStreamReady,
 267                                      weak_ptr_factory_.GetWeakPtr()));
 268     return;
 269   } else if (result != MOJO_RESULT_OK) {
 270     // The response body stream is in a bad state. Bail.
 271     // TODO(darin): How should this be communicated to our client?
 272     return;
 273   }
 274   CHECK_GT(static_cast<uint32_t>(std::numeric_limits<int>::max()), num_bytes);
 275
 276   scoped_refptr<net::IOBuffer> buf(new NetToMojoIOBuffer(pending_write_.get()));
 277
 278   int bytes_read;
 279   url_request_->Read(buf.get(), static_cast<int>(num_bytes), &bytes_read);
 280   if (url_request_->status().is_io_pending()) {
 281     // Wait for OnReadCompleted.
 282   } else if (url_request_->status().is_success() && bytes_read > 0) {
 283     DidRead(static_cast<uint32_t>(bytes_read), true);
 284   } else {
 285     pending_write_->Complete(0);
 286     pending_write_ = NULL;  // This closes the data pipe.
 287   }
 288 }
 289
 290 void URLLoaderImpl::DidRead(uint32_t num_bytes, bool completed_synchronously) {
 291   DCHECK(url_request_->status().is_success());
 292
 293   response_body_stream_ = pending_write_->Complete(num_bytes);
 294   pending_write_ = NULL;
 295
 296   if (completed_synchronously) {
 297     base::MessageLoop::current()->PostTask(
 298         FROM_HERE,
 299         base::Bind(&URLLoaderImpl::ReadMore, weak_ptr_factory_.GetWeakPtr()));
 300   } else {
 301     ReadMore();
 302   }
 303 }
 304
 305 }  // namespace mojo