Added a net::BidirectionalStream to expose a bidirectional streaming interface

net/http/bidirectional_stream_job.h

+// Copyright 2015 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_HTTP_BIDIRECTIONAL_STREAM_JOB_H_
+#define NET_HTTP_BIDIRECTIONAL_STREAM_JOB_H_
+
+#include "base/macros.h"
+#include "net/base/net_export.h"
+#include "net/base/request_priority.h"
+
+namespace net {
+
+class BoundNetLog;
+class IOBuffer;
+class SpdyHeaderBlock;
+struct HttpRequestInfo;
+
+// Exposes an interface to do HTTP/2 bidirectional streaming.
+// Note that only one ReadData or SendData should be in flight until the
+// operation completes synchronously or asynchronously.
+// BidirectionalStreamJob once created by HttpStreamFactoryImpl should be owned
+// by BidirectionalStream.
+class NET_EXPORT_PRIVATE BidirectionalStreamJob {
+ public:
+  // Delegate to handle BidirectionalStreamJob events.
+  class Delegate {
+   public:
+    Delegate();
+
+    // Called when the request headers have been sent.
+    virtual void OnRequestHeadersSent() = 0;
+
+    // Called when response headers are received.
+    // The delegate should call BidirectionalStreamJob::ReadData to start
+    // reading or call BidirectionalStream::Cancel to cancel the stream.
+    virtual void OnHeaders(const SpdyHeaderBlock& response_headers) = 0;
+
+    // Called when read is completed asynchronously. |bytes_read| specifies how
+    // much data is available.
+    // The delegate should call BidirectionalStreamJob::ReadData to continue
+    // reading or call BidirectionalStream::Cancel to cancel the stream.
+    virtual void OnReadCompleted(int bytes_read) = 0;
+
+    // Called when the entire buffer passed through SendData is sent.
+    virtual void OnDataSent() = 0;
+
+    // Called when trailers are received.
+    virtual void OnTrailers(const SpdyHeaderBlock& trailers) = 0;
+
+    // Called when an error occurred.
+    // No other delegate functions will be called after this.
+    virtual void OnFailed(int status) = 0;
+
+   protected:
+    virtual ~Delegate();
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(Delegate);
+  };
+
+  BidirectionalStreamJob();
+  virtual ~BidirectionalStreamJob();
+
+  // Starts the BidirectionalStreamJob and sends request headers.
+  virtual void Start(const HttpRequestInfo& request_info,
+                     RequestPriority priority,
+                     const BoundNetLog& net_log,
+                     Delegate* delegate) = 0;
+
+  // Reads at most |buf_len| bytes into |buf|. Returns the number of bytes read,
+  // or ERR_IO_PENDING if the read is to be completed asynchronously.
+  virtual int ReadData(IOBuffer* buf, int buf_len) = 0;
+
+  // Sends data. This should not be called again until OnDataSent is invoked.
+  virtual void SendData(IOBuffer* data, int length, bool end_stream) = 0;
+
+  // Cancels the stream. No Delegate method will be called.
+  virtual void Cancel() = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(BidirectionalStreamJob);
+};
+
+}  // namespace net
+
+#endif  // NET_HTTP_BIDIRECTIONAL_STREAM_JOB_H_