| // Copyright (c) 2012 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_STREAM_H_ |
| #define NET_WEBSOCKETS_WEBSOCKET_STREAM_H_ |
| |
| #include <string> |
| #include <vector> |
| |
| #include "base/basictypes.h" |
| #include "base/callback_forward.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "base/memory/scoped_vector.h" |
| #include "net/base/completion_callback.h" |
| #include "net/base/net_export.h" |
| #include "net/websockets/websocket_event_interface.h" |
| #include "net/websockets/websocket_handshake_request_info.h" |
| #include "net/websockets/websocket_handshake_response_info.h" |
| |
| class GURL; |
| |
| namespace url { |
| class Origin; |
| } // namespace url |
| |
| namespace net { |
| |
| class BoundNetLog; |
| class URLRequestContext; |
| struct WebSocketFrame; |
| |
| // WebSocketStreamRequest is the caller's handle to the process of creation of a |
| // WebSocketStream. Deleting the object before the OnSuccess or OnFailure |
| // callbacks are called will cancel the request (and neither callback will be |
| // called). After OnSuccess or OnFailure have been called, this object may be |
| // safely deleted without side-effects. |
| class NET_EXPORT_PRIVATE WebSocketStreamRequest { |
| public: |
| virtual ~WebSocketStreamRequest(); |
| }; |
| |
| // WebSocketStream is a transport-agnostic interface for reading and writing |
| // WebSocket frames. This class provides an abstraction for WebSocket streams |
| // based on various transport layers, such as normal WebSocket connections |
| // (WebSocket protocol upgraded from HTTP handshake), SPDY transports, or |
| // WebSocket connections with multiplexing extension. Subtypes of |
| // WebSocketStream are responsible for managing the underlying transport |
| // appropriately. |
| // |
| // All functions except Close() can be asynchronous. If an operation cannot |
| // be finished synchronously, the function returns ERR_IO_PENDING, and |
| // |callback| will be called when the operation is finished. Non-null |callback| |
| // must be provided to these functions. |
| |
| class NET_EXPORT_PRIVATE WebSocketStream { |
| public: |
| // A concrete object derived from ConnectDelegate is supplied by the caller to |
| // CreateAndConnectStream() to receive the result of the connection. |
| class NET_EXPORT_PRIVATE ConnectDelegate { |
| public: |
| virtual ~ConnectDelegate(); |
| // Called on successful connection. The parameter is an object derived from |
| // WebSocketStream. |
| virtual void OnSuccess(scoped_ptr<WebSocketStream> stream) = 0; |
| |
| // Called on failure to connect. |
| // |message| contains defails of the failure. |
| virtual void OnFailure(const std::string& message) = 0; |
| |
| // Called when the WebSocket Opening Handshake starts. |
| virtual void OnStartOpeningHandshake( |
| scoped_ptr<WebSocketHandshakeRequestInfo> request) = 0; |
| |
| // Called when the WebSocket Opening Handshake ends. |
| virtual void OnFinishOpeningHandshake( |
| scoped_ptr<WebSocketHandshakeResponseInfo> response) = 0; |
| |
| // Called when there is an SSL certificate error. Should call |
| // ssl_error_callbacks->ContinueSSLRequest() or |
| // ssl_error_callbacks->CancelSSLRequest(). |
| virtual void OnSSLCertificateError( |
| scoped_ptr<WebSocketEventInterface::SSLErrorCallbacks> |
| ssl_error_callbacks, |
| const SSLInfo& ssl_info, |
| bool fatal) = 0; |
| }; |
| |
| // Create and connect a WebSocketStream of an appropriate type. The actual |
| // concrete type returned depends on whether multiplexing or SPDY are being |
| // used to communicate with the remote server. If the handshake completed |
| // successfully, then connect_delegate->OnSuccess() is called with a |
| // WebSocketStream instance. If it failed, then connect_delegate->OnFailure() |
| // is called with a WebSocket result code corresponding to the error. Deleting |
| // the returned WebSocketStreamRequest object will cancel the connection, in |
| // which case the |connect_delegate| object that the caller passed will be |
| // deleted without any of its methods being called. Unless cancellation is |
| // required, the caller should keep the WebSocketStreamRequest object alive |
| // until connect_delegate->OnSuccess() or OnFailure() have been called, then |
| // it is safe to delete. |
| static scoped_ptr<WebSocketStreamRequest> CreateAndConnectStream( |
| const GURL& socket_url, |
| const std::vector<std::string>& requested_subprotocols, |
| const url::Origin& origin, |
| URLRequestContext* url_request_context, |
| const BoundNetLog& net_log, |
| scoped_ptr<ConnectDelegate> connect_delegate); |
| |
| // Derived classes must make sure Close() is called when the stream is not |
| // closed on destruction. |
| virtual ~WebSocketStream(); |
| |
| // Reads WebSocket frame data. This operation finishes when new frame data |
| // becomes available. |
| // |
| // |frames| remains owned by the caller and must be valid until the |
| // operation completes or Close() is called. |frames| must be empty on |
| // calling. |
| // |
| // This function should not be called while the previous call of ReadFrames() |
| // is still pending. |
| // |
| // Returns net::OK or one of the net::ERR_* codes. |
| // |
| // frames->size() >= 1 if the result is OK. |
| // |
| // Only frames with complete header information are inserted into |frames|. If |
| // the currently available bytes of a new frame do not form a complete frame |
| // header, then the implementation will buffer them until all the fields in |
| // the WebSocketFrameHeader object can be filled. If ReadFrames() is freshly |
| // called in this situation, it will return ERR_IO_PENDING exactly as if no |
| // data was available. |
| // |
| // Original frame boundaries are not preserved. In particular, if only part of |
| // a frame is available, then the frame will be split, and the available data |
| // will be returned immediately. |
| // |
| // When the socket is closed on the remote side, this method will return |
| // ERR_CONNECTION_CLOSED. It will not return OK with an empty vector. |
| // |
| // If the connection is closed in the middle of receiving an incomplete frame, |
| // ReadFrames may discard the incomplete frame. Since the renderer will |
| // discard any incomplete messages when the connection is closed, this makes |
| // no difference to the overall semantics. |
| // |
| // Implementations of ReadFrames() must be able to handle being deleted during |
| // the execution of callback.Run(). In practice this means that the method |
| // calling callback.Run() (and any calling methods in the same object) must |
| // return immediately without any further method calls or access to member |
| // variables. Implementors should write test(s) for this case. |
| // |
| // Extensions which use reserved header bits should clear them when they are |
| // set correctly. If the reserved header bits are set incorrectly, it is okay |
| // to leave it to the caller to report the error. |
| virtual int ReadFrames(ScopedVector<WebSocketFrame>* frames, |
| const CompletionCallback& callback) = 0; |
| |
| // Writes WebSocket frame data. |
| // |
| // |frames| must be valid until the operation completes or Close() is called. |
| // |
| // This function must not be called while a previous call of WriteFrames() is |
| // still pending. |
| // |
| // This method will only return OK if all frames were written completely. |
| // Otherwise it will return an appropriate net error code. |
| // |
| // The callback implementation is permitted to delete this |
| // object. Implementations of WriteFrames() should be robust against |
| // this. This generally means returning to the event loop immediately after |
| // calling the callback. |
| virtual int WriteFrames(ScopedVector<WebSocketFrame>* frames, |
| const CompletionCallback& callback) = 0; |
| |
| // Closes the stream. All pending I/O operations (if any) are cancelled |
| // at this point, so |frames| can be freed. |
| virtual void Close() = 0; |
| |
| // The subprotocol that was negotiated for the stream. If no protocol was |
| // negotiated, then the empty string is returned. |
| virtual std::string GetSubProtocol() const = 0; |
| |
| // The extensions that were negotiated for the stream. Since WebSocketStreams |
| // can be layered, this may be different from what this particular |
| // WebSocketStream implements. The primary purpose of this accessor is to make |
| // the data available to Javascript. The format of the string is identical to |
| // the contents of the Sec-WebSocket-Extensions header supplied by the server, |
| // with some canonicalisations applied (leading and trailing whitespace |
| // removed, multiple headers concatenated into one comma-separated list). See |
| // RFC6455 section 9.1 for the exact format specification. If no |
| // extensions were negotiated, the empty string is returned. |
| virtual std::string GetExtensions() const = 0; |
| |
| protected: |
| WebSocketStream(); |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(WebSocketStream); |
| }; |
| |
| } // namespace net |
| |
| #endif // NET_WEBSOCKETS_WEBSOCKET_STREAM_H_ |