content/renderer/p2p/socket_client.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 "content/renderer/p2p/socket_client.h"

#include "base/bind.h"
#include "base/message_loop/message_loop_proxy.h"
#include "content/common/p2p_messages.h"
#include "content/renderer/p2p/socket_dispatcher.h"
#include "crypto/random.h"

namespace {

uint64 GetUniqueId(uint32 random_socket_id, uint32 packet_id) {
  uint64 uid = random_socket_id;
  uid <<= 32;
  uid |= packet_id;
  return uid;
}

}  // namespace

namespace content {

P2PSocketClient::P2PSocketClient(P2PSocketDispatcher* dispatcher)
    : dispatcher_(dispatcher),
      ipc_message_loop_(dispatcher->message_loop()),
      delegate_message_loop_(base::MessageLoopProxy::current()),
      socket_id_(0), delegate_(NULL),
      state_(STATE_UNINITIALIZED),
      random_socket_id_(0),
      next_packet_id_(0) {
  crypto::RandBytes(&random_socket_id_, sizeof(random_socket_id_));
}

P2PSocketClient::~P2PSocketClient() {
  CHECK(state_ == STATE_CLOSED || state_ == STATE_UNINITIALIZED);
}

void P2PSocketClient::Init(
    P2PSocketType type,
    const net::IPEndPoint& local_address,
    const net::IPEndPoint& remote_address,
    P2PSocketClient::Delegate* delegate) {
  DCHECK(delegate_message_loop_->BelongsToCurrentThread());
  // |delegate_| is only accessesed on |delegate_message_loop_|.
  delegate_ = delegate;

  ipc_message_loop_->PostTask(
      FROM_HERE, base::Bind(&P2PSocketClient::DoInit, this, type, local_address,
                            remote_address));
}

void P2PSocketClient::DoInit(P2PSocketType type,
                             const net::IPEndPoint& local_address,
                             const net::IPEndPoint& remote_address) {
  DCHECK_EQ(state_, STATE_UNINITIALIZED);
  DCHECK(delegate_);
  state_ = STATE_OPENING;
  socket_id_ = dispatcher_->RegisterClient(this);
  dispatcher_->SendP2PMessage(new P2PHostMsg_CreateSocket(
      type, socket_id_, local_address, remote_address));
}

void P2PSocketClient::SendWithDscp(
    const net::IPEndPoint& address,
    const std::vector<char>& data,
    net::DiffServCodePoint dscp) {
  if (!ipc_message_loop_->BelongsToCurrentThread()) {
    ipc_message_loop_->PostTask(
        FROM_HERE, base::Bind(&P2PSocketClient::Send, this, address, data));
    return;
  }

  // Can send data only when the socket is open.
  DCHECK(state_ == STATE_OPEN || state_ == STATE_ERROR);
  if (state_ == STATE_OPEN) {
    uint64 unique_id = GetUniqueId(random_socket_id_, ++next_packet_id_);
    TRACE_EVENT_ASYNC_BEGIN0("p2p", "Send", unique_id);
    dispatcher_->SendP2PMessage(new P2PHostMsg_Send(socket_id_, address, data,
                                                    dscp, unique_id));
  }
}

void P2PSocketClient::Send(const net::IPEndPoint& address,
                           const std::vector<char>& data) {
  SendWithDscp(address, data, net::DSCP_DEFAULT);
}

void P2PSocketClient::Close() {
  DCHECK(delegate_message_loop_->BelongsToCurrentThread());

  delegate_ = NULL;

  ipc_message_loop_->PostTask(
      FROM_HERE, base::Bind(&P2PSocketClient::DoClose, this));
}

void P2PSocketClient::DoClose() {
  DCHECK(ipc_message_loop_->BelongsToCurrentThread());
  if (dispatcher_) {
    if (state_ == STATE_OPEN || state_ == STATE_OPENING ||
        state_ == STATE_ERROR) {
      dispatcher_->SendP2PMessage(new P2PHostMsg_DestroySocket(socket_id_));
    }
    dispatcher_->UnregisterClient(socket_id_);
  }

  state_ = STATE_CLOSED;
}

void P2PSocketClient::set_delegate(Delegate* delegate) {
  DCHECK(delegate_message_loop_->BelongsToCurrentThread());
  delegate_ = delegate;
}

void P2PSocketClient::OnSocketCreated(const net::IPEndPoint& address) {
  DCHECK(ipc_message_loop_->BelongsToCurrentThread());
  DCHECK_EQ(state_, STATE_OPENING);
  state_ = STATE_OPEN;

  delegate_message_loop_->PostTask(
      FROM_HERE,
      base::Bind(&P2PSocketClient::DeliverOnSocketCreated, this, address));
}

void P2PSocketClient::DeliverOnSocketCreated(const net::IPEndPoint& address) {
  DCHECK(delegate_message_loop_->BelongsToCurrentThread());
  if (delegate_)
    delegate_->OnOpen(address);
}

void P2PSocketClient::OnIncomingTcpConnection(const net::IPEndPoint& address) {
  DCHECK(ipc_message_loop_->BelongsToCurrentThread());
  DCHECK_EQ(state_, STATE_OPEN);

  scoped_refptr<P2PSocketClient> new_client = new P2PSocketClient(dispatcher_);
  new_client->socket_id_ = dispatcher_->RegisterClient(new_client.get());
  new_client->state_ = STATE_OPEN;
  new_client->delegate_message_loop_ = delegate_message_loop_;

  dispatcher_->SendP2PMessage(new P2PHostMsg_AcceptIncomingTcpConnection(
      socket_id_, address, new_client->socket_id_));

  delegate_message_loop_->PostTask(
      FROM_HERE, base::Bind(&P2PSocketClient::DeliverOnIncomingTcpConnection,
                            this, address, new_client));
}

void P2PSocketClient::DeliverOnIncomingTcpConnection(
    const net::IPEndPoint& address, scoped_refptr<P2PSocketClient> new_client) {
  DCHECK(delegate_message_loop_->BelongsToCurrentThread());
  if (delegate_) {
    delegate_->OnIncomingTcpConnection(address, new_client.get());
  } else {
    // Just close the socket if there is no delegate to accept it.
    new_client->Close();
  }
}

void P2PSocketClient::OnSendComplete() {
  DCHECK(ipc_message_loop_->BelongsToCurrentThread());

  delegate_message_loop_->PostTask(
      FROM_HERE, base::Bind(&P2PSocketClient::DeliverOnSendComplete, this));
}

void P2PSocketClient::DeliverOnSendComplete() {
  DCHECK(delegate_message_loop_->BelongsToCurrentThread());
  if (delegate_)
    delegate_->OnSendComplete();
}

void P2PSocketClient::OnError() {
  DCHECK(ipc_message_loop_->BelongsToCurrentThread());
  state_ = STATE_ERROR;

  delegate_message_loop_->PostTask(
      FROM_HERE, base::Bind(&P2PSocketClient::DeliverOnError, this));
}

void P2PSocketClient::DeliverOnError() {
  DCHECK(delegate_message_loop_->BelongsToCurrentThread());
  if (delegate_)
    delegate_->OnError();
}

void P2PSocketClient::OnDataReceived(const net::IPEndPoint& address,
                                     const std::vector<char>& data) {
  DCHECK(ipc_message_loop_->BelongsToCurrentThread());
  DCHECK_EQ(STATE_OPEN, state_);
  delegate_message_loop_->PostTask(
      FROM_HERE,
      base::Bind(&P2PSocketClient::DeliverOnDataReceived, this, address, data));
}

void P2PSocketClient::DeliverOnDataReceived(const net::IPEndPoint& address,
                                            const std::vector<char>& data) {
  DCHECK(delegate_message_loop_->BelongsToCurrentThread());
  if (delegate_)
    delegate_->OnDataReceived(address, data);
}

void P2PSocketClient::Detach() {
  DCHECK(ipc_message_loop_->BelongsToCurrentThread());
  dispatcher_ = NULL;
  OnError();
}

}  // namespace content