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// 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 NET_WEBSOCKETS_WEBSOCKET_EVENT_INTERFACE_H_
#define NET_WEBSOCKETS_WEBSOCKET_EVENT_INTERFACE_H_
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "net/base/net_export.h"
namespace net {
// Interface for events sent from the network layer to the content layer. These
// events will generally be sent as-is to the renderer process.
class NET_EXPORT WebSocketEventInterface {
public:
typedef int WebSocketMessageType;
virtual ~WebSocketEventInterface() {}
// Called in response to an AddChannelRequest. This generally means that a
// response has been received from the remote server, but the response might
// have been generated internally. If |fail| is true, the channel cannot be
// used and it is valid to delete the WebSocketChannel from within this
// callback.
virtual void OnAddChannelResponse(
bool fail,
const std::string& selected_subprotocol) = 0;
// Called when a data frame has been received from the remote host and needs
// to be forwarded to the renderer process. It is not safe to delete the
// WebSocketChannel object from within this callback.
virtual void OnDataFrame(bool fin,
WebSocketMessageType type,
const std::vector<char>& data) = 0;
// Called to provide more send quota for this channel to the renderer
// process. Currently the quota units are always bytes of message body
// data. In future it might depend on the type of multiplexing in use. It is
// not safe to delete the WebSocketChannel from within this callback.
virtual void OnFlowControl(int64 quota) = 0;
// Called when the remote server has Started the WebSocket Closing
// Handshake. The client should not attempt to send any more messages after
// receiving this message. It will be followed by OnDropChannel() when the
// closing handshake is complete. It is not safe to delete the
// WebSocketChannel from within this callback.
virtual void OnClosingHandshake() = 0;
// Called when the channel has been dropped, either due to a network close, a
// network error, or a protocol error. This may or may not be preceeded by a
// call to OnClosingHandshake().
//
// Warning: Both the |code| and |reason| are passed through to Javascript, so
// callers must take care not to provide details that could be useful to
// attackers attempting to use WebSockets to probe networks.
//
// The channel should not be used again after OnDropChannel() has been
// called.
//
// It is not safe to delete the WebSocketChannel from within this
// callback. It is recommended to delete the channel after returning to the
// event loop.
virtual void OnDropChannel(uint16 code, const std::string& reason) = 0;
protected:
WebSocketEventInterface() {}
private:
DISALLOW_COPY_AND_ASSIGN(WebSocketEventInterface);
};
} // namespace net
#endif // NET_WEBSOCKETS_WEBSOCKET_EVENT_INTERFACE_H_
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