// Copyright 2013 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.

#ifndef CONTENT_BROWSER_RENDERER_HOST_WEBSOCKET_HOST_H_
#define CONTENT_BROWSER_RENDERER_HOST_WEBSOCKET_HOST_H_

#include <stdint.h>

#include <memory>
#include <string>
#include <vector>

#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "content/common/content_export.h"
#include "content/common/websocket.h"

class GURL;

namespace url {
class Origin;
}  // namespace url

namespace net {
class WebSocketChannel;
class URLRequestContext;
}  // namespace net

namespace IPC {
class Message;
}  // namespace IPC

namespace content {

class WebSocketBlobSender;
class WebSocketDispatcherHost;

// Host of net::WebSocketChannel. The lifetime of an instance of this class is
// completely controlled by the WebSocketDispatcherHost object.
class CONTENT_EXPORT WebSocketHost {
 public:
  WebSocketHost(int routing_id,
                WebSocketDispatcherHost* dispatcher,
                net::URLRequestContext* url_request_context,
                base::TimeDelta delay);
  virtual ~WebSocketHost();

  // The renderer process is going away.
  // This function is virtual for testing.
  virtual void GoAway();

  // General message dispatch. WebSocketDispatcherHost::OnMessageReceived
  // delegates to this method after looking up the |routing_id|.
  virtual bool OnMessageReceived(const IPC::Message& message);

  int routing_id() const { return routing_id_; }

  bool handshake_succeeded() const { return handshake_succeeded_; }
  void OnHandshakeSucceeded() { handshake_succeeded_ = true; }

 private:
  class WebSocketEventHandler;

  // Handlers for each message type, dispatched by OnMessageReceived(), as
  // defined in content/common/websocket_messages.h

  void OnAddChannelRequest(const GURL& socket_url,
                           const std::vector<std::string>& requested_protocols,
                           const url::Origin& origin,
                           int render_frame_id);

  void AddChannel(const GURL& socket_url,
                  const std::vector<std::string>& requested_protocols,
                  const url::Origin& origin,
                  int render_frame_id);

  void OnSendBlob(const std::string& uuid, uint64_t expected_size);

  void OnSendFrame(bool fin,
                   WebSocketMessageType type,
                   const std::vector<char>& data);

  void OnFlowControl(int64_t quota);

  void OnDropChannel(bool was_clean, uint16_t code, const std::string& reason);

  void BlobSendComplete(int result);

  // non-NULL if and only if this object is currently in "blob sending mode".
  std::unique_ptr<WebSocketBlobSender> blob_sender_;

  // The channel we use to send events to the network.
  std::unique_ptr<net::WebSocketChannel> channel_;

  // The WebSocketHostDispatcher that created this object.
  WebSocketDispatcherHost* const dispatcher_;

  // The URL request context for the channel.
  net::URLRequestContext* const url_request_context_;

  // The ID used to route messages.
  const int routing_id_;

  // Delay used for per-renderer WebSocket throttling.
  base::TimeDelta delay_;

  // SendFlowControl() is delayed when OnFlowControl() is called before
  // AddChannel() is called.
  // Zero indicates there is no pending SendFlowControl().
  int64_t pending_flow_control_quota_;

  // handshake_succeeded_ is set and used by WebSocketDispatcherHost
  // to manage counters for per-renderer WebSocket throttling.
  bool handshake_succeeded_;

  base::WeakPtrFactory<WebSocketHost> weak_ptr_factory_;

  DISALLOW_COPY_AND_ASSIGN(WebSocketHost);
};

}  // namespace content

#endif  // CONTENT_BROWSER_RENDERER_HOST_WEBSOCKET_HOST_H_