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 <stdint.h>
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "net/base/net_export.h"
+#include "net/base/request_priority.h"
+#include "net/socket/next_proto.h"
+
+namespace base {
+class Timer;
+}  // namespace base
+
+namespace net {
+
+class BoundNetLog;
+class IOBuffer;
+class SpdyHeaderBlock;
+struct BidirectionalStreamRequestInfo;
+
+// 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.
+    // The delegate may call BidirectionalStreamJob::SendData to start
+    // sending data.
+    virtual void OnHeadersSent() = 0;
+
+    // Called when response headers are received.
+    // This is called at most once for the lifetime of a stream.
+    // The delegate may call BidirectionalStreamJob::ReadData to start
+    // reading or call BidirectionalStream::Cancel to cancel the stream.
+    virtual void OnHeadersReceived(const SpdyHeaderBlock& response_headers) = 0;
+
+    // Called when read is completed asynchronously. |bytes_read| specifies how
+    // much data is available.
+    // The delegate may call BidirectionalStreamJob::ReadData to continue
+    // reading or call BidirectionalStream::Cancel to cancel the stream.
+    virtual void OnDataRead(int bytes_read) = 0;
+
+    // Called when the entire buffer passed through SendData is sent.
+    virtual void OnDataSent() = 0;
+
+    // Called when trailers are received. This is called as soon as trailers
+    // are received, which can happen before a read completes.
+    virtual void OnTrailersReceived(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();
+
+  // |this| should not be destroyed during Delegate::OnHeadersSent or
+  // Delegate::OnDataSent.
+  virtual ~BidirectionalStreamJob();
+
+  // Starts the BidirectionalStreamJob and sends request headers.
+  virtual void Start(const BidirectionalStreamRequestInfo& request_info,
+                     RequestPriority priority,

[mef, 2015/12/15 22:59:40]

should priority be folded into request_info?

[xunjieli, 2015/12/16 00:26:09]

Done. I don't see why not. Though in the future we might want to add the ability
to set priority after the stream is created.

+                     const BoundNetLog& net_log,
+                     BidirectionalStreamJob::Delegate* delegate,
+                     scoped_ptr<base::Timer> timer) = 0;
+
+  // Reads at most |buf_len| bytes into |buf|. Returns the number of bytes read,
+  // ERR_IO_PENDING if the read is to be completed asynchronously, or an error
+  // code if any error occurred.
+  // This should not be called before Delegate::OnHeadersSent is invoked, and
+  // should not be called again unless it IO completes synchronously or until
+  // Delegate::OnDataRead is invoked.
+  virtual int ReadData(IOBuffer* buf, int buf_len) = 0;
+
+  // Sends data. This should not be called be called before
+  // Delegate::OnHeadersSent is invoked, and should not be called again until
+  // Delegate::OnDataSent is invoked.
+  virtual void SendData(IOBuffer* data, int length, bool end_stream) = 0;
+
+  // Cancels the stream. No Delegate method will be called. Any pending
+  // operations may or may not succeed.
+  virtual void Cancel() = 0;
+
+  // Returns the protocol used by this stream. Always between
+  // kProtoSPDYMinimumVersion and kProtoSPDYMaximumVersion.

[mef, 2015/12/15 22:59:40]

I suppose that QUIC implementation will return higher version.

[xunjieli, 2015/12/16 00:26:09]

Done. Good catch! Was copying from SpdyStream, and forgot to change it :\

+  virtual NextProto GetProtocol() const = 0;
+
+  // Total number of bytes received over the network of SPDY data, headers, and
+  // push_promise frames associated with this stream, including the size of
+  // frame headers, after SSL decryption and not including proxy overhead.
+  virtual int64_t GetTotalReceivedBytes() const = 0;
+
+  // Total number of bytes sent over the network of SPDY frames associated with
+  // this stream, including the size of frame headers, before SSL encryption and
+  // not including proxy overhead. Note that some SPDY frames such as pings are
+  // not associated with any stream, and are not included in this value.
+  virtual int64_t GetTotalSentBytes() const = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(BidirectionalStreamJob);
+};
+
+}  // namespace net
+
+#endif  // NET_HTTP_BIDIRECTIONAL_STREAM_JOB_H_