SPDY: Add WriteHeaders interface to SpdySession and SpdyStream

net/spdy/spdy_stream.cc

 // Copyright (c) 2012 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 "net/spdy/spdy_stream.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/stringprintf.h"
@@ skipping 119 matching lines @@
     send_time_ = base::TimeTicks::Now();
     return frame;
   } else {
     CHECK(!cancelled());
     // We must need to write stream data.
     // Until the headers have been completely sent, we can not be sure
     // that our stream_id is correct.
     DCHECK_GT(io_state_, STATE_SEND_HEADERS_COMPLETE);
     DCHECK_GT(stream_id_, 0u);
     DCHECK(!pending_data_frames_.empty());
-    SpdyFrame* frame = pending_data_frames_.front();
+
+    PendingFrame frame = pending_data_frames_.front();
+    SpdyHeaderBlock* headers = frame.first;
+    SpdyDataFrame* data_frame = frame.second;
     pending_data_frames_.pop_front();
-    return frame;
+
+    // |frame| should have one valid data.
+    DCHECK(!headers != !data_frame);
+
+    // Send queued data frame.
+    if (data_frame)
+      return data_frame;
+
+    // Create actual HEADERS frame just in time because it depends on
+    // compression context and should not be reordered after the creation.
+    SpdyFrame* header_frame = session_->CreateHeadersFrame(
+        stream_id_, *headers, SpdyControlFlags());
+    delete headers;
+    return header_frame;
   }
 }
 
 SpdyStream::~SpdyStream() {
   UpdateHistograms();
   while (!pending_data_frames_.empty()) {
-    SpdyFrame* frame = pending_data_frames_.back();
+    PendingFrame frame = pending_data_frames_.back();
+    SpdyHeaderBlock* headers = frame.first;
+    SpdyDataFrame* data_frame = frame.second;
     pending_data_frames_.pop_back();
-    delete frame;
+    if (headers)
+      delete headers;
+    if (data_frame)
+      delete data_frame;
   }
 }
 
 void SpdyStream::SetDelegate(Delegate* delegate) {
   CHECK(delegate);
   delegate_ = delegate;
 
   if (pushed_) {
     CHECK(response_received());
     MessageLoop::current()->PostTask(
@@ skipping 386 matching lines @@
     send_time_ = base::TimeTicks::Now();
     DCHECK(!has_upload_data_);
     DCHECK(response_received());
     return ERR_IO_PENDING;
   }
   CHECK_EQ(STATE_NONE, io_state_);
   io_state_ = STATE_GET_DOMAIN_BOUND_CERT;
   return DoLoop(OK);
 }
 
-int SpdyStream::WriteStreamData(IOBuffer* data, int length,
+int SpdyStream::WriteHeaders(SpdyHeaderBlock* headers) {
+  // Until the first headers by SYN_STREAM have been completely sent, we can
+  // not be sure that our stream_id is correct.
+  DCHECK_GT(io_state_, STATE_SEND_HEADERS_COMPLETE);
+  CHECK_GT(stream_id_, 0u);
+
+  pending_data_frames_.push_back(PendingFrame(headers, NULL));
+
+  SetHasWriteAvailable();
+  return ERR_IO_PENDING;
+}
+
+int SpdyStream::WriteStreamData(IOBuffer* data,
+                                int length,
                                 SpdyDataFlags flags) {
   // Until the headers have been completely sent, we can not be sure
   // that our stream_id is correct.
   DCHECK_GT(io_state_, STATE_SEND_HEADERS_COMPLETE);
   CHECK_GT(stream_id_, 0u);
 
-  pending_data_frames_.push_back(
-      session_->CreateDataFrame(stream_id_, data, length, flags));
-
-  SetHasWriteAvailable();
+  SpdyDataFrame* frame = session_->CreateDataFrame(
+      stream_id_, data, length, flags);
+  if (frame) {
+    pending_data_frames_.push_back(PendingFrame(NULL, frame));
+    SetHasWriteAvailable();
+  }
   return ERR_IO_PENDING;
 }
 
 bool SpdyStream::GetSSLInfo(SSLInfo* ssl_info,
                             bool* was_npn_negotiated,
                             NextProto* protocol_negotiated) {
   return session_->GetSSLInfo(
       ssl_info, was_npn_negotiated, protocol_negotiated);
 }
 
@@ skipping 219 matching lines @@
   UMA_HISTOGRAM_TIMES("Net.SpdyStreamDownloadTime",
       recv_last_byte_time_ - recv_first_byte_time_);
   UMA_HISTOGRAM_TIMES("Net.SpdyStreamTime",
       recv_last_byte_time_ - send_time_);
 
   UMA_HISTOGRAM_COUNTS("Net.SpdySendBytes", send_bytes_);
   UMA_HISTOGRAM_COUNTS("Net.SpdyRecvBytes", recv_bytes_);
 }
 
 }  // namespace net