Initial work for UDP Pepper API

ppapi/proxy/ppb_flash_udp_socket_proxy.cc

Index: ppapi/proxy/ppb_flash_udp_socket_proxy.cc
diff --git a/ppapi/proxy/ppb_flash_udp_socket_proxy.cc b/ppapi/proxy/ppb_flash_udp_socket_proxy.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ffeef4accd0cdab90119d1a4d62e95a9de6bf3c4
--- /dev/null
+++ b/ppapi/proxy/ppb_flash_udp_socket_proxy.cc
@@ -0,0 +1,390 @@
+// 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 "ppapi/proxy/ppb_flash_udp_socket_proxy.h"
+
+#include <algorithm>
+#include <cstring>
+#include <map>
+
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop.h"
+#include "base/task.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/proxy/plugin_dispatcher.h"
+#include "ppapi/proxy/plugin_resource_tracker.h"
+#include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/shared_impl/resource.h"
+#include "ppapi/thunk/ppb_flash_udp_socket_api.h"
+#include "ppapi/thunk/thunk.h"
+
+using ppapi::thunk::PPB_Flash_UDPSocket_API;
+
+namespace ppapi {
+namespace proxy {
+
+const int32_t kFlashUDPSocketMaxReadSize = 1024 * 1024;
+const int32_t kFlashUDPSocketMaxWriteSize = 1024 * 1024;
+
+namespace {
+
+class FlashUDPSocket;
+
+typedef std::map<uint32, FlashUDPSocket*> IDToSocketMap;
+IDToSocketMap* g_id_to_socket = NULL;
+
+class AbortCallbackTask : public Task {
+ public:
+  explicit AbortCallbackTask(PP_CompletionCallback callback)
+      : callback_(callback) {}
+  virtual ~AbortCallbackTask() {}
+  virtual void Run() {
+    if (callback_.func)
+      PP_RunCompletionCallback(&callback_, PP_ERROR_ABORTED);
+  }
+
+ private:
+  PP_CompletionCallback callback_;
+};
+
+InterfaceProxy* CreateFlashUDPSocketProxy(Dispatcher* dispatcher) {
+  return new PPB_Flash_UDPSocket_Proxy(dispatcher);
+}
+
+class FlashUDPSocket : public PPB_Flash_UDPSocket_API,
+                       public Resource {
+ public:
+  FlashUDPSocket(const HostResource& resource, uint32 socket_id);
+  virtual ~FlashUDPSocket();
+
+  // ResourceObjectBase overrides.
+  virtual PPB_Flash_UDPSocket_API* AsPPB_Flash_UDPSocket_API() OVERRIDE;
+
+  // PPB_Flash_UDPSocket_API implementation.
+  virtual int32_t Bind(const PP_Flash_NetAddress* addr,
+                       PP_CompletionCallback callback) OVERRIDE;
+  virtual int32_t RecvFrom(char* buffer,
+                           int32_t num_bytes,
+                           PP_CompletionCallback callback) OVERRIDE;
+  virtual PP_Bool GetRecvFromAddress(PP_Flash_NetAddress* addr) OVERRIDE;
+
+  virtual int32_t SendTo(const char* buffer,
+                         int32_t num_bytes,
+                         const PP_Flash_NetAddress* addr,
+                         PP_CompletionCallback callback) OVERRIDE;
+  virtual void Close() OVERRIDE;
+
+  // Notifications from the proxy.
+  void OnBindCompleted(bool succeeded);
+  void OnRecvFromCompleted(bool succeeded,
+                           const std::string& data,
+                           const PP_Flash_NetAddress& addr);
+  void OnSendToCompleted(bool succeeded,
+                         int32_t bytes_written);
+
+ private:
+  void PostAbortAndClearIfNecessary(PP_CompletionCallback* callback);
+
+  PluginDispatcher* GetDispatcher() const {
+    return PluginDispatcher::GetForResource(this);
+  }
+
+  uint32 socket_id_;
+
+  bool binded_;
+  bool closed_;
+
+  PP_CompletionCallback bind_callback_;
+  PP_CompletionCallback recvfrom_callback_;
+  PP_CompletionCallback sendto_callback_;
+
+  char* read_buffer_;
+  int32_t bytes_to_read_;
+
+  PP_Flash_NetAddress recvfrom_addr_;
+
+  DISALLOW_COPY_AND_ASSIGN(FlashUDPSocket);
+};
+
+FlashUDPSocket::FlashUDPSocket(const HostResource& resource,
+                               uint32 socket_id)
+    : Resource(resource),
+      socket_id_(socket_id),
+      binded_(false),
+      closed_(false),
+      bind_callback_(PP_BlockUntilComplete()),
+      recvfrom_callback_(PP_BlockUntilComplete()),
+      sendto_callback_(PP_BlockUntilComplete()),
+      read_buffer_(NULL),
+      bytes_to_read_(-1) {
+  DCHECK(socket_id != 0);
+
+  recvfrom_addr_.size = 0;
+  memset(recvfrom_addr_.data, 0, sizeof(recvfrom_addr_.data));
+
+  if (!g_id_to_socket)
+    g_id_to_socket = new IDToSocketMap();
+  DCHECK(g_id_to_socket->find(socket_id) == g_id_to_socket->end());
+  (*g_id_to_socket)[socket_id] = this;
+}
+
+FlashUDPSocket::~FlashUDPSocket() {
+  Close();
+}
+
+PPB_Flash_UDPSocket_API* FlashUDPSocket::AsPPB_Flash_UDPSocket_API() {
+  return this;
+}
+
+int32_t FlashUDPSocket::Bind(const PP_Flash_NetAddress* addr,
+                             PP_CompletionCallback callback) {
+  if (!addr || !callback.func)
+    return PP_ERROR_BADARGUMENT;
+  if (binded_ || closed_)
+    return PP_ERROR_FAILED;
+  if (bind_callback_.func)
+    return PP_ERROR_INPROGRESS;
+
+  bind_callback_ = callback;
+
+  GetDispatcher()->SendToBrowser(
+      new PpapiHostMsg_PPBFlashUDPSocket_Bind(socket_id_, *addr));
+
+  return PP_OK_COMPLETIONPENDING;
+}
+
+int32_t FlashUDPSocket::RecvFrom(char* buffer,
+                                 int32_t num_bytes,
+                                 PP_CompletionCallback callback) {
+  if (!buffer || num_bytes <= 0 || !callback.func)
+    return PP_ERROR_BADARGUMENT;
+  if (!binded_)
+    return PP_ERROR_FAILED;
+  if (recvfrom_callback_.func)
+    return PP_ERROR_INPROGRESS;
+
+  read_buffer_ = buffer;
+  bytes_to_read_ = std::min(num_bytes, kFlashUDPSocketMaxReadSize);
+  recvfrom_callback_ = callback;
+
+  // Send the request, the browser will call us back via RecvFromACK.
+  GetDispatcher()->SendToBrowser(
+      new PpapiHostMsg_PPBFlashUDPSocket_RecvFrom(
+          socket_id_, num_bytes));
+  return PP_OK_COMPLETIONPENDING;
+}
+
+PP_Bool FlashUDPSocket::GetRecvFromAddress(PP_Flash_NetAddress* addr) {
+  if (!addr)
+    return PP_FALSE;
+
+  *addr = recvfrom_addr_;
+  return PP_TRUE;
+}
+
+int32_t FlashUDPSocket::SendTo(const char* buffer,
+                               int32_t num_bytes,
+                               const PP_Flash_NetAddress* addr,
+                               PP_CompletionCallback callback) {
+  if (!buffer || num_bytes <= 0 || !addr || !callback.func)
+    return PP_ERROR_BADARGUMENT;
+  if (!binded_)
+    return PP_ERROR_FAILED;
+  if (sendto_callback_.func)
+    return PP_ERROR_INPROGRESS;
+
+  if (num_bytes > kFlashUDPSocketMaxWriteSize)
+    num_bytes = kFlashUDPSocketMaxWriteSize;
+
+  sendto_callback_ = callback;
+
+  // Send the request, the browser will call us back via SendToACK.
+  GetDispatcher()->SendToBrowser(
+      new PpapiHostMsg_PPBFlashUDPSocket_SendTo(
+          socket_id_, std::string(buffer, num_bytes), *addr));
+
+  return PP_OK_COMPLETIONPENDING;
+}
+
+void FlashUDPSocket::Close() {
+  if(closed_)
+    return;
+
+  binded_ = false;
+  closed_ = true;
+
+  // After removed from the mapping, this object won't receive any notfications
+  // from the proxy.
+  DCHECK(g_id_to_socket->find(socket_id_) != g_id_to_socket->end());
+  g_id_to_socket->erase(socket_id_);
+
+  GetDispatcher()->SendToBrowser(
+      new PpapiHostMsg_PPBFlashUDPSocket_Close(socket_id_));
+  socket_id_ = 0;
+
+  PostAbortAndClearIfNecessary(&bind_callback_);
+  PostAbortAndClearIfNecessary(&recvfrom_callback_);
+  PostAbortAndClearIfNecessary(&sendto_callback_);
+}
+
+void FlashUDPSocket::OnBindCompleted(bool succeeded) {
+  if (!bind_callback_.func) {
+    NOTREACHED();
+    return;
+  }
+
+  if (succeeded)
+    binded_ = true;
+
+  PP_RunAndClearCompletionCallback(&bind_callback_,
+                                   succeeded ? PP_OK : PP_ERROR_FAILED);
+}
+
+void FlashUDPSocket::OnRecvFromCompleted(bool succeeded,
+                                         const std::string& data,
+                                         const PP_Flash_NetAddress& addr) {
+  if (!recvfrom_callback_.func || !read_buffer_) {
+    NOTREACHED();
+    return;
+  }
+
+  if (succeeded) {
+    CHECK_LE(static_cast<int32_t>(data.size()), bytes_to_read_);
+    if (!data.empty())
+      memcpy(read_buffer_, data.c_str(), data.size());
+  }
+  read_buffer_ = NULL;
+  bytes_to_read_ = -1;
+  recvfrom_addr_ = addr;
+
+  PP_RunAndClearCompletionCallback(
+      &recvfrom_callback_,
+      succeeded ? static_cast<int32_t>(data.size()) :
+                  static_cast<int32_t>(PP_ERROR_FAILED));
+}
+
+void FlashUDPSocket::OnSendToCompleted(bool succeeded,
+                                       int32_t bytes_written) {
+  if (!sendto_callback_.func) {
+    NOTREACHED();
+    return;
+  }
+
+  PP_RunAndClearCompletionCallback(
+      &sendto_callback_,
+      succeeded ? bytes_written : static_cast<int32_t>(PP_ERROR_FAILED));
+}
+
+void FlashUDPSocket::PostAbortAndClearIfNecessary(
+    PP_CompletionCallback* callback) {
+  DCHECK(callback);
+
+  if (callback->func) {
+    MessageLoop::current()->PostTask(FROM_HERE,
+                                     new AbortCallbackTask(*callback));
+    *callback = PP_BlockUntilComplete();
+  }
+}
+}  // namespace
+
+PPB_Flash_UDPSocket_Proxy::PPB_Flash_UDPSocket_Proxy(Dispatcher* dispatcher)
+    : InterfaceProxy(dispatcher) {
+}
+
+PPB_Flash_UDPSocket_Proxy::~PPB_Flash_UDPSocket_Proxy() {
+}
+
+// static
+const InterfaceProxy::Info* PPB_Flash_UDPSocket_Proxy::GetInfo() {
+  static const Info info = {
+    ::ppapi::thunk::GetPPB_Flash_UDPSocket_Thunk(),
+    PPB_FLASH_UDPSOCKET_INTERFACE,
+    INTERFACE_ID_PPB_FLASH_UDPSOCKET,
+    false,
+    &CreateFlashUDPSocketProxy,
+  };
+  return &info;
+}
+
+// static
+PP_Resource PPB_Flash_UDPSocket_Proxy::CreateProxyResource(
+    PP_Instance instance) {
+  PluginDispatcher* dispatcher = PluginDispatcher::GetForInstance(instance);
+  if (!dispatcher)
+    return 0;
+
+  uint32 socket_id = 0;
+  dispatcher->SendToBrowser(new PpapiHostMsg_PPBFlashUDPSocket_Create(
+      INTERFACE_ID_PPB_FLASH_UDPSOCKET, dispatcher->plugin_dispatcher_id(),
+      &socket_id));
+  if (socket_id == 0)
+    return 0;
+
+  return (new FlashUDPSocket(HostResource::MakeInstanceOnly(instance),
+                             socket_id))->GetReference();
+}
+
+bool PPB_Flash_UDPSocket_Proxy::OnMessageReceived(const IPC::Message& msg) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(PPB_Flash_UDPSocket_Proxy, msg)
+    IPC_MESSAGE_HANDLER(PpapiMsg_PPBFlashUDPSocket_BindACK,
+                        OnMsgBindACK)
+    IPC_MESSAGE_HANDLER(PpapiMsg_PPBFlashUDPSocket_RecvFromACK,
+                        OnMsgRecvFromACK)
+    IPC_MESSAGE_HANDLER(PpapiMsg_PPBFlashUDPSocket_SendToACK,
+                        OnMsgSendToACK)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void PPB_Flash_UDPSocket_Proxy::OnMsgBindACK(
+    uint32 /* plugin_dispatcher_id */,
+    uint32 socket_id,
+    bool succeeded) {
+  if (!g_id_to_socket) {
+    NOTREACHED();
+    return;
+  }
+  IDToSocketMap::iterator iter = g_id_to_socket->find(socket_id);
+  if (iter == g_id_to_socket->end())
+    return;
+  iter->second->OnBindCompleted(succeeded);
+}
+
+void PPB_Flash_UDPSocket_Proxy::OnMsgRecvFromACK(
+    uint32 /* plugin_dispatcher_id */,
+    uint32 socket_id,
+    bool succeeded,
+    const std::string& data,
+    const PP_Flash_NetAddress& addr) {
+  if (!g_id_to_socket) {
+    NOTREACHED();
+    return;
+  }
+  IDToSocketMap::iterator iter = g_id_to_socket->find(socket_id);
+  if (iter == g_id_to_socket->end())
+    return;
+  iter->second->OnRecvFromCompleted(succeeded, data, addr);
+}
+
+void PPB_Flash_UDPSocket_Proxy::OnMsgSendToACK(
+    uint32 /* plugin_dispatcher_id */,
+    uint32 socket_id,
+    bool succeeded,
+    int32_t bytes_written) {
+  if (!g_id_to_socket) {
+    NOTREACHED();
+    return;
+  }
+  IDToSocketMap::iterator iter = g_id_to_socket->find(socket_id);
+  if (iter == g_id_to_socket->end())
+    return;
+  iter->second->OnSendToCompleted(succeeded, bytes_written);
+}
+
+}  // namespace proxy
+}  // namespace ppapi
+