Revert of Revert "Revert of Moving gRPC support interfaces out of cronet and into a new component. (patchset …

components/cronet/ios/cronet_bidirectional_stream.cc

Index: components/cronet/ios/cronet_bidirectional_stream.cc
diff --git a/components/cronet/ios/cronet_bidirectional_stream.cc b/components/cronet/ios/cronet_bidirectional_stream.cc
new file mode 100644
index 0000000000000000000000000000000000000000..325b611e361a8effa941ec8304b59863d5b19994
--- /dev/null
+++ b/components/cronet/ios/cronet_bidirectional_stream.cc
@@ -0,0 +1,390 @@
+// Copyright 2016 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.
+
+#include "components/cronet/ios/cronet_bidirectional_stream.h"
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/logging.h"
+#include "base/memory/ref_counted.h"
+#include "base/strings/string_number_conversions.h"
+#include "components/cronet/ios/cronet_environment.h"
+#include "net/base/io_buffer.h"
+#include "net/base/net_errors.h"
+#include "net/base/request_priority.h"
+#include "net/http/bidirectional_stream.h"
+#include "net/http/bidirectional_stream_request_info.h"
+#include "net/http/http_network_session.h"
+#include "net/http/http_response_headers.h"
+#include "net/http/http_status_code.h"
+#include "net/http/http_transaction_factory.h"
+#include "net/http/http_util.h"
+#include "net/spdy/spdy_header_block.h"
+#include "net/ssl/ssl_info.h"
+#include "net/url_request/http_user_agent_settings.h"
+#include "net/url_request/url_request_context.h"
+#include "url/gurl.h"
+
+namespace cronet {
+
+CronetBidirectionalStream::WriteBuffers::WriteBuffers() {}
+
+CronetBidirectionalStream::WriteBuffers::~WriteBuffers() {}
+
+void CronetBidirectionalStream::WriteBuffers::Clear() {
+  write_buffer_list.clear();
+  write_buffer_len_list.clear();
+}
+
+void CronetBidirectionalStream::WriteBuffers::AppendBuffer(
+    const scoped_refptr<net::IOBuffer>& buffer,
+    int buffer_size) {
+  write_buffer_list.push_back(buffer);
+  write_buffer_len_list.push_back(buffer_size);
+}
+
+void CronetBidirectionalStream::WriteBuffers::MoveTo(WriteBuffers* target) {
+  std::move(write_buffer_list.begin(), write_buffer_list.end(),
+            std::back_inserter(target->write_buffer_list));
+  std::move(write_buffer_len_list.begin(), write_buffer_len_list.end(),
+            std::back_inserter(target->write_buffer_len_list));
+  Clear();
+}
+
+bool CronetBidirectionalStream::WriteBuffers::Empty() const {
+  return write_buffer_list.empty();
+}
+
+CronetBidirectionalStream::CronetBidirectionalStream(
+    CronetEnvironment* environment,
+    Delegate* delegate)
+    : read_state_(NOT_STARTED),
+      write_state_(NOT_STARTED),
+      write_end_of_stream_(false),
+      request_headers_sent_(false),
+      disable_auto_flush_(false),
+      delay_headers_until_flush_(false),
+      environment_(environment),
+      pending_write_data_(new WriteBuffers()),
+      flushing_write_data_(new WriteBuffers()),
+      sending_write_data_(new WriteBuffers()),
+      delegate_(delegate),
+      weak_factory_(this) {
+  weak_this_ = weak_factory_.GetWeakPtr();
+}
+
+CronetBidirectionalStream::~CronetBidirectionalStream() {
+  DCHECK(environment_->IsOnNetworkThread());
+}
+
+int CronetBidirectionalStream::Start(const char* url,
+                                     int priority,
+                                     const char* method,
+                                     const net::HttpRequestHeaders& headers,
+                                     bool end_of_stream) {
+  // Prepare request info here to be able to return the error.
+  std::unique_ptr<net::BidirectionalStreamRequestInfo> request_info(
+      new net::BidirectionalStreamRequestInfo());
+  request_info->url = GURL(url);
+  request_info->priority = static_cast<net::RequestPriority>(priority);
+  // Http method is a token, just as header name.
+  request_info->method = method;
+  if (!net::HttpUtil::IsValidHeaderName(request_info->method))
+    return -1;
+  request_info->extra_headers.CopyFrom(headers);
+  request_info->end_stream_on_headers = end_of_stream;
+  write_end_of_stream_ = end_of_stream;
+  DCHECK(environment_);
+  environment_->PostToNetworkThread(
+      FROM_HERE, base::Bind(&CronetBidirectionalStream::StartOnNetworkThread,
+                            weak_this_, base::Passed(&request_info)));
+  return 0;
+}
+
+bool CronetBidirectionalStream::ReadData(char* buffer, int capacity) {
+  if (!buffer)
+    return false;
+  scoped_refptr<net::WrappedIOBuffer> read_buffer(
+      new net::WrappedIOBuffer(buffer));
+
+  environment_->PostToNetworkThread(
+      FROM_HERE, base::Bind(&CronetBidirectionalStream::ReadDataOnNetworkThread,
+                            weak_this_, read_buffer, capacity));
+  return true;
+}
+
+bool CronetBidirectionalStream::WriteData(const char* buffer,
+                                          int count,
+                                          bool end_of_stream) {
+  if (!buffer)
+    return false;
+
+  scoped_refptr<net::WrappedIOBuffer> write_buffer(
+      new net::WrappedIOBuffer(buffer));
+
+  environment_->PostToNetworkThread(
+      FROM_HERE,
+      base::Bind(&CronetBidirectionalStream::WriteDataOnNetworkThread,
+                 weak_this_, write_buffer, count, end_of_stream));
+  return true;
+}
+
+void CronetBidirectionalStream::Flush() {
+  environment_->PostToNetworkThread(
+      FROM_HERE,
+      base::Bind(&CronetBidirectionalStream::FlushOnNetworkThread, weak_this_));
+}
+
+void CronetBidirectionalStream::Cancel() {
+  environment_->PostToNetworkThread(
+      FROM_HERE, base::Bind(&CronetBidirectionalStream::CancelOnNetworkThread,
+                            weak_this_));
+}
+
+void CronetBidirectionalStream::Destroy() {
+  // Destroy could be called from any thread, including network thread (if
+  // posting task to executor throws an exception), but is posted, so |this|
+  // is valid until calling task is complete.
+  environment_->PostToNetworkThread(
+      FROM_HERE, base::Bind(&CronetBidirectionalStream::DestroyOnNetworkThread,
+                            base::Unretained(this)));
+}
+
+void CronetBidirectionalStream::OnStreamReady(bool request_headers_sent) {
+  DCHECK(environment_->IsOnNetworkThread());
+  DCHECK_EQ(STARTED, write_state_);
+  if (!bidi_stream_)
+    return;
+  request_headers_sent_ = request_headers_sent;
+  write_state_ = WAITING_FOR_FLUSH;
+  if (write_end_of_stream_) {
+    if (!request_headers_sent) {
+      // If there is no data to write, then just send headers explicitly.
+      bidi_stream_->SendRequestHeaders();
+      request_headers_sent_ = true;
+    }
+    write_state_ = WRITING_DONE;
+  }
+  delegate_->OnStreamReady();
+}
+
+void CronetBidirectionalStream::OnHeadersReceived(
+    const net::SpdyHeaderBlock& response_headers) {
+  DCHECK(environment_->IsOnNetworkThread());
+  DCHECK_EQ(STARTED, read_state_);
+  if (!bidi_stream_)
+    return;
+  read_state_ = WAITING_FOR_READ;
+  // Get http status code from response headers.
+  int http_status_code = 0;
+  const auto http_status_header = response_headers.find(":status");
+  if (http_status_header != response_headers.end())
+    base::StringToInt(http_status_header->second, &http_status_code);
+  const char* protocol = "unknown";
+  switch (bidi_stream_->GetProtocol()) {
+    case net::kProtoHTTP2:
+      protocol = "h2";
+      break;
+    case net::kProtoQUIC:
+      protocol = "quic/1+spdy/3";
+      break;
+    default:
+      break;
+  }
+  delegate_->OnHeadersReceived(response_headers, protocol);
+}
+
+void CronetBidirectionalStream::OnDataRead(int bytes_read) {
+  DCHECK(environment_->IsOnNetworkThread());
+  DCHECK_EQ(READING, read_state_);
+  if (!bidi_stream_)
+    return;
+  read_state_ = WAITING_FOR_READ;
+  delegate_->OnDataRead(read_buffer_->data(), bytes_read);
+
+  // Free the read buffer.
+  read_buffer_ = nullptr;
+  if (bytes_read == 0)
+    read_state_ = READING_DONE;
+  MaybeOnSucceded();
+}
+
+void CronetBidirectionalStream::OnDataSent() {
+  DCHECK(environment_->IsOnNetworkThread());
+  if (!bidi_stream_)
+    return;
+  DCHECK_EQ(WRITING, write_state_);
+  write_state_ = WAITING_FOR_FLUSH;
+  for (const scoped_refptr<net::IOBuffer>& buffer :
+       sending_write_data_->buffers()) {
+    delegate_->OnDataSent(buffer->data());
+  }
+  sending_write_data_->Clear();
+  // Send data flushed while other data was sending.
+  if (!flushing_write_data_->Empty()) {
+    SendFlushingWriteData();
+    return;
+  }
+  if (write_end_of_stream_ && pending_write_data_->Empty()) {
+    write_state_ = WRITING_DONE;
+    MaybeOnSucceded();
+  }
+}
+
+void CronetBidirectionalStream::OnTrailersReceived(
+    const net::SpdyHeaderBlock& response_trailers) {
+  DCHECK(environment_->IsOnNetworkThread());
+  if (!bidi_stream_)
+    return;
+  delegate_->OnTrailersReceived(response_trailers);
+}
+
+void CronetBidirectionalStream::OnFailed(int error) {
+  DCHECK(environment_->IsOnNetworkThread());
+  if (!bidi_stream_ && read_state_ != NOT_STARTED)
+    return;
+  read_state_ = write_state_ = ERROR;
+  weak_factory_.InvalidateWeakPtrs();
+  // Delete underlying |bidi_stream_| asynchronously as it may still be used.
+  environment_->PostToNetworkThread(
+      FROM_HERE, base::Bind(&base::DeletePointer<net::BidirectionalStream>,
+                            bidi_stream_.release()));
+  delegate_->OnFailed(error);
+}
+
+void CronetBidirectionalStream::StartOnNetworkThread(
+    std::unique_ptr<net::BidirectionalStreamRequestInfo> request_info) {
+  DCHECK(environment_->IsOnNetworkThread());
+  DCHECK(!bidi_stream_);
+  DCHECK(environment_->GetURLRequestContext());
+  request_info->extra_headers.SetHeaderIfMissing(
+      net::HttpRequestHeaders::kUserAgent, environment_->user_agent());
+  bidi_stream_.reset(new net::BidirectionalStream(
+      std::move(request_info), environment_->GetURLRequestContext()
+                                   ->http_transaction_factory()
+                                   ->GetSession(),
+      !delay_headers_until_flush_, this));
+  DCHECK(read_state_ == NOT_STARTED && write_state_ == NOT_STARTED);
+  read_state_ = write_state_ = STARTED;
+}
+
+void CronetBidirectionalStream::ReadDataOnNetworkThread(
+    scoped_refptr<net::WrappedIOBuffer> read_buffer,
+    int buffer_size) {
+  DCHECK(environment_->IsOnNetworkThread());
+  DCHECK(read_buffer);
+  DCHECK(!read_buffer_);
+  if (read_state_ != WAITING_FOR_READ) {
+    DLOG(ERROR) << "Unexpected Read Data in read_state " << read_state_;
+    // Invoke OnFailed unless it is already invoked.
+    if (read_state_ != ERROR)
+      OnFailed(net::ERR_UNEXPECTED);
+    return;
+  }
+  read_state_ = READING;
+  read_buffer_ = read_buffer;
+
+  int bytes_read = bidi_stream_->ReadData(read_buffer_.get(), buffer_size);
+  // If IO is pending, wait for the BidirectionalStream to call OnDataRead.
+  if (bytes_read == net::ERR_IO_PENDING)
+    return;
+
+  if (bytes_read < 0) {
+    OnFailed(bytes_read);
+    return;
+  }
+  OnDataRead(bytes_read);
+}
+
+void CronetBidirectionalStream::WriteDataOnNetworkThread(
+    scoped_refptr<net::WrappedIOBuffer> write_buffer,
+    int buffer_size,
+    bool end_of_stream) {
+  DCHECK(environment_->IsOnNetworkThread());
+  DCHECK(write_buffer);
+  DCHECK(!write_end_of_stream_);
+  if (!bidi_stream_ || write_end_of_stream_) {
+    DLOG(ERROR) << "Unexpected Flush Data in write_state " << write_state_;
+    // Invoke OnFailed unless it is already invoked.
+    if (write_state_ != ERROR)
+      OnFailed(net::ERR_UNEXPECTED);
+    return;
+  }
+  pending_write_data_->AppendBuffer(write_buffer, buffer_size);
+  write_end_of_stream_ = end_of_stream;
+  if (!disable_auto_flush_)
+    FlushOnNetworkThread();
+}
+
+void CronetBidirectionalStream::FlushOnNetworkThread() {
+  DCHECK(environment_->IsOnNetworkThread());
+  if (!bidi_stream_)
+    return;
+  // If there is no data to flush, may need to send headers.
+  if (pending_write_data_->Empty()) {
+    if (!request_headers_sent_) {
+      request_headers_sent_ = true;
+      bidi_stream_->SendRequestHeaders();
+    }
+    return;
+  }
+  // If request headers are not sent yet, they will be sent with the data.
+  if (!request_headers_sent_)
+    request_headers_sent_ = true;
+
+  // Move pending data to the flushing list.
+  pending_write_data_->MoveTo(flushing_write_data_.get());
+  DCHECK(pending_write_data_->Empty());
+  if (write_state_ != WRITING)
+    SendFlushingWriteData();
+}
+
+void CronetBidirectionalStream::SendFlushingWriteData() {
+  DCHECK(bidi_stream_);
+  // If previous send is not done, or there is nothing to flush, then exit.
+  if (write_state_ == WRITING || flushing_write_data_->Empty())
+    return;
+  DCHECK(sending_write_data_->Empty());
+  write_state_ = WRITING;
+  flushing_write_data_->MoveTo(sending_write_data_.get());
+  bidi_stream_->SendvData(sending_write_data_->buffers(),
+                          sending_write_data_->lengths(),
+                          write_end_of_stream_ && pending_write_data_->Empty());
+}
+
+void CronetBidirectionalStream::CancelOnNetworkThread() {
+  DCHECK(environment_->IsOnNetworkThread());
+  if (!bidi_stream_)
+    return;
+  read_state_ = write_state_ = CANCELED;
+  bidi_stream_.reset();
+  weak_factory_.InvalidateWeakPtrs();
+  delegate_->OnCanceled();
+}
+
+void CronetBidirectionalStream::DestroyOnNetworkThread() {
+  DCHECK(environment_->IsOnNetworkThread());
+  delete this;
+}
+
+void CronetBidirectionalStream::MaybeOnSucceded() {
+  DCHECK(environment_->IsOnNetworkThread());
+  if (!bidi_stream_)
+    return;
+  if (read_state_ == READING_DONE && write_state_ == WRITING_DONE) {
+    read_state_ = write_state_ = SUCCESS;
+    weak_factory_.InvalidateWeakPtrs();
+    // Delete underlying |bidi_stream_| asynchronously as it may still be used.
+    environment_->PostToNetworkThread(
+        FROM_HERE, base::Bind(&base::DeletePointer<net::BidirectionalStream>,
+                              bidi_stream_.release()));
+    delegate_->OnSucceeded();
+  }
+}
+
+}  // namespace cronet