Port QuicServer to Chrome network stack

net/quic/quic_server_packet_writer.cc

 // Copyright 2014 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/quic/quic_server_packet_writer.h"
 
+#include "base/callback_helpers.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/metrics/sparse_histogram.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
+#include "net/udp/udp_server_socket.h"
 
 namespace net {
 
-QuicServerPacketWriter::QuicServerPacketWriter() : weak_factory_(this) {
-}
-
-QuicServerPacketWriter::QuicServerPacketWriter(UDPServerSocket* socket)
+QuicServerPacketWriter::QuicServerPacketWriter(
+    UDPServerSocket* socket,
+    QuicBlockedWriterInterface* blocked_writer)
     : weak_factory_(this),
       socket_(socket),
+      blocked_writer_(blocked_writer),
       write_blocked_(false) {
 }
 
 QuicServerPacketWriter::~QuicServerPacketWriter() {
 }
 
-WriteResult QuicServerPacketWriter::WritePacket(
-    const char* buffer, size_t buf_len,
-    const net::IPAddressNumber& self_address,
-    const net::IPEndPoint& peer_address) {
-  scoped_refptr<StringIOBuffer> buf(
-      new StringIOBuffer(std::string(buffer, buf_len)));
-  DCHECK(!IsWriteBlocked());
-  int rv = socket_->SendTo(buf.get(),
-                           buf_len,
-                           peer_address,
-                           base::Bind(&QuicServerPacketWriter::OnWriteComplete,
-                                      weak_factory_.GetWeakPtr()));
-  WriteStatus status = WRITE_STATUS_OK;
-  if (rv < 0) {
-    if (rv != ERR_IO_PENDING) {
-      UMA_HISTOGRAM_SPARSE_SLOWLY("Net.QuicSession.WriteError", -rv);
-      status = WRITE_STATUS_ERROR;
-    } else {
-      status = WRITE_STATUS_BLOCKED;
-      write_blocked_ = true;
-    }
+WriteResult QuicServerPacketWriter::WritePacketWithCallback(
+    const char* buffer,
+    size_t buf_len,
+    const IPAddressNumber& self_address,
+    const IPEndPoint& peer_address,
+    WriteCallback callback) {
+  DCHECK(callback_.is_null());
+  callback_ = callback;
+  WriteResult result = WritePacket(buffer, buf_len, self_address, peer_address);
+  if (result.status != WRITE_STATUS_BLOCKED) {
+    callback_.Reset();
   }
+  return result;
+}
 
-  return WriteResult(status, rv);
+void QuicServerPacketWriter::OnWriteComplete(int rv) {
+  DCHECK_NE(rv, ERR_IO_PENDING);
+  write_blocked_ = false;
+  WriteResult result(rv < 0 ? WRITE_STATUS_ERROR : WRITE_STATUS_OK, rv);
+  base::ResetAndReturn(&callback_).Run(result);
+  blocked_writer_->OnCanWrite();
 }
 
 bool QuicServerPacketWriter::IsWriteBlockedDataBuffered() const {
   // UDPServerSocket::SendTo buffers the data until the Write is permitted.
   return true;
 }
 
 bool QuicServerPacketWriter::IsWriteBlocked() const {
   return write_blocked_;
 }
 
 void QuicServerPacketWriter::SetWritable() {
   write_blocked_ = false;
 }
 
-void QuicServerPacketWriter::OnWriteComplete(int rv) {
-  DCHECK_NE(rv, ERR_IO_PENDING);
-  write_blocked_ = false;
-  WriteResult result(rv < 0 ? WRITE_STATUS_ERROR : WRITE_STATUS_OK, rv);
-  connection_->OnPacketSent(result);
-  connection_->OnCanWrite();
+WriteResult QuicServerPacketWriter::WritePacket(
+    const char* buffer,
+    size_t buf_len,
+    const IPAddressNumber& self_address,
+    const IPEndPoint& peer_address) {
+  scoped_refptr<StringIOBuffer> buf(
+      new StringIOBuffer(std::string(buffer, buf_len)));
+  DCHECK(!IsWriteBlocked());
+  DCHECK(!callback_.is_null());
+  int rv;
+  if (buf_len <= static_cast<size_t>(std::numeric_limits<int>::max())) {

[wtc, 2014/06/24 21:47:21]

I confirm this check is correct.

+    rv = socket_->SendTo(buf.get(),
+                         static_cast<int>(buf_len),
+                         peer_address,
+                         base::Bind(&QuicServerPacketWriter::OnWriteComplete,
+                                    weak_factory_.GetWeakPtr()));
+  } else {
+    rv = ERR_MSG_TOO_BIG;
+  }
+  WriteStatus status = WRITE_STATUS_OK;
+  if (rv < 0) {
+    if (rv != ERR_IO_PENDING) {
+      UMA_HISTOGRAM_SPARSE_SLOWLY("Net.QuicSession.WriteError", -rv);
+      status = WRITE_STATUS_ERROR;
+    } else {
+      status = WRITE_STATUS_BLOCKED;
+      write_blocked_ = true;
+    }
+  }
+  return WriteResult(status, rv);
 }
 
 }  // namespace net