Channel adapter for Pepper P2P Transport API.

remoting/protocol/pepper_p2p_channel.cc

+// Copyright (c) 2011 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 "remoting/protocol/pepper_p2p_channel.h"
+
+#include "base/logging.h"
+#include "net/base/io_buffer.h"
+#include "net/base/net_errors.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/cpp/dev/transport_dev.h"
+#include "ppapi/cpp/var.h"
+
+namespace remoting {
+namespace protocol {
+
+namespace {
+
+const char kPepperTransportUdpProtocol[] = "udp";
+
+// Maps value returned by Recv() and Send() Pepper methods to net::Error.
+int PPErrorToNetError(int result) {
+  if (result > 0)
+    return result;
+
+  switch (result) {
+    case PP_OK:
+      return net::OK;
+    case PP_OK_COMPLETIONPENDING:
+      return net::ERR_IO_PENDING;
+    default:
+      return net::ERR_FAILED;
+  }
+}
+
+}  // namespace
+
+PepperP2PChannel::PepperP2PChannel(
+    pp::Instance* pp_instance,
+    const char* name,
+    const IncomingCandidateCallback& candidate_callback)
+    : candidate_callback_(candidate_callback),
+      get_address_pending_(false),
+      read_callback_(NULL),
+      write_callback_(NULL) {
+  transport_.reset(
+      new pp::Transport_Dev(pp_instance, name, kPepperTransportUdpProtocol));
+}
+
+bool PepperP2PChannel::Init() {
+  // This will return false when the GetNextAddress() returns an
+  // error. Particularly it is useful to detect when the P2P Transport
+  // API is not supported.
+  return ProcessCandidates();
+}
+
+PepperP2PChannel::~PepperP2PChannel() {
+}
+
+void PepperP2PChannel::AddRemoteCandidate(const std::string& candidate) {
+  DCHECK(CalledOnValidThread());
+  transport_->ReceiveRemoteAddress(candidate);
+}
+
+int PepperP2PChannel::Read(net::IOBuffer* buf, int buf_len,
+                           net::CompletionCallback* callback) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(!read_callback_);
+  DCHECK(!read_buffer_);
+
+  int result = PPErrorToNetError(transport_->Recv(
+      buf->data(), buf_len,
+      pp::CompletionCallback(&PepperP2PChannel::ReadCallback, this)));
+
+  if (result == net::ERR_IO_PENDING) {
+    read_callback_ = callback;
+    read_buffer_ = buf;
+  }
+
+  return result;
+}
+
+int PepperP2PChannel::Write(net::IOBuffer* buf, int buf_len,
+                            net::CompletionCallback* callback) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(!write_callback_);
+  DCHECK(!write_buffer_);
+
+  int result = PPErrorToNetError(transport_->Send(
+      buf->data(), buf_len,
+      pp::CompletionCallback(&PepperP2PChannel::WriteCallback, this)));
+
+  if (result == net::ERR_IO_PENDING) {
+    write_callback_ = callback;
+    write_buffer_ = buf;
+  }
+
+  return result;
+}
+
+bool PepperP2PChannel::SetReceiveBufferSize(int32 size) {
+  DCHECK(CalledOnValidThread());
+  NOTIMPLEMENTED();
+  return false;
+}
+
+bool PepperP2PChannel::SetSendBufferSize(int32 size) {
+  DCHECK(CalledOnValidThread());
+  NOTIMPLEMENTED();
+  return false;
+}
+
+bool PepperP2PChannel::ProcessCandidates() {
+  DCHECK(CalledOnValidThread());
+  DCHECK(!get_address_pending_);
+
+  while (true) {
+    pp::Var address;
+    int result = transport_->GetNextAddress(
+        &address,
+        pp::CompletionCallback(&PepperP2PChannel::NextAddressCallback, this));
+    if (result == PP_OK_COMPLETIONPENDING) {
+      get_address_pending_ = true;
+      break;
+    }
+
+    if (result == PP_OK) {
+      candidate_callback_.Run(address.AsString());
+    } else {
+      LOG(ERROR) << "GetNextAddress() returned an error " << result;
+      return false;
+    }
+  }
+  return true;
+}
+
+// static
+void PepperP2PChannel::NextAddressCallback(void* data, int32_t result) {
+  PepperP2PChannel* channel = reinterpret_cast<PepperP2PChannel*>(data);
+  DCHECK(channel->CalledOnValidThread());
+  channel->get_address_pending_ = false;
+  channel->ProcessCandidates();
+}
+
+// static
+void PepperP2PChannel::ReadCallback(void* data, int32_t result) {
+  PepperP2PChannel* channel = reinterpret_cast<PepperP2PChannel*>(data);
+  DCHECK(channel->CalledOnValidThread());
+  DCHECK(channel->read_callback_);
+  DCHECK(channel->read_buffer_);
+  net::CompletionCallback* callback = channel->read_callback_;
+  channel->read_callback_ = NULL;
+  channel->read_buffer_ = NULL;
+  callback->Run(result);
+}
+
+// static
+void PepperP2PChannel::WriteCallback(void* data, int32_t result) {
+  PepperP2PChannel* channel = reinterpret_cast<PepperP2PChannel*>(data);
+  DCHECK(channel->CalledOnValidThread());
+  DCHECK(channel->write_callback_);
+  DCHECK(channel->write_buffer_);
+  net::CompletionCallback* callback = channel->write_callback_;
+  channel->write_callback_ = NULL;
+  channel->write_buffer_ = NULL;
+  callback->Run(result);
+}
+
+}  // namespace protocol
+}  // namespace remoting