Add Socket::ReadIfReady()

net/socket/socket.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright 2016 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_SOCKET_SOCKET_H_
-#define NET_SOCKET_SOCKET_H_
+#include "net/socket/socket.h"
 
-#include <stdint.h>
-
-#include "net/base/completion_callback.h"
-#include "net/base/net_export.h"
+#include "net/base/net_errors.h"
 
 namespace net {
 
-class IOBuffer;
+const char Socket::kReadIfReadyTrialName[] = "SocketReadIfReady";

[davidben, 2017/02/01 22:25:57]

I think base::Feature is the preferred way to do these sorts of toggles
nowadays. (Mostly it saves having to mess with strings.) Then you'd add a static
Socket::IsReadIfReadyEnabled() or something like that.

Would make calling code simpler too. Right now all the callers have to replicate
the string thing.

[xunjieli, 2017/02/03 16:35:33]

Done. Neat!

 
-// Represents a read/write socket.
-class NET_EXPORT Socket {
- public:
-  virtual ~Socket() {}
-
-  // Reads data, up to |buf_len| bytes, from the socket.  The number of bytes
-  // read is returned, or an error is returned upon failure.
-  // ERR_SOCKET_NOT_CONNECTED should be returned if the socket is not currently
-  // connected.  Zero is returned once to indicate end-of-file; the return value
-  // of subsequent calls is undefined, and may be OS dependent.  ERR_IO_PENDING
-  // is returned if the operation could not be completed synchronously, in which
-  // case the result will be passed to the callback when available. If the
-  // operation is not completed immediately, the socket acquires a reference to
-  // the provided buffer until the callback is invoked or the socket is
-  // closed.  If the socket is Disconnected before the read completes, the
-  // callback will not be invoked.
-  virtual int Read(IOBuffer* buf, int buf_len,
-                   const CompletionCallback& callback) = 0;
-
-  // Writes data, up to |buf_len| bytes, to the socket.  Note: data may be
-  // written partially.  The number of bytes written is returned, or an error
-  // is returned upon failure.  ERR_SOCKET_NOT_CONNECTED should be returned if
-  // the socket is not currently connected.  The return value when the
-  // connection is closed is undefined, and may be OS dependent.  ERR_IO_PENDING
-  // is returned if the operation could not be completed synchronously, in which
-  // case the result will be passed to the callback when available.  If the
-  // operation is not completed immediately, the socket acquires a reference to
-  // the provided buffer until the callback is invoked or the socket is
-  // closed.  Implementations of this method should not modify the contents
-  // of the actual buffer that is written to the socket.  If the socket is
-  // Disconnected before the write completes, the callback will not be invoked.
-  virtual int Write(IOBuffer* buf, int buf_len,
-                    const CompletionCallback& callback) = 0;
-
-  // Set the receive buffer size (in bytes) for the socket.
-  // Note: changing this value can affect the TCP window size on some platforms.
-  // Returns a net error code.
-  virtual int SetReceiveBufferSize(int32_t size) = 0;
-
-  // Set the send buffer size (in bytes) for the socket.
-  // Note: changing this value can affect the TCP window size on some platforms.
-  // Returns a net error code.
-  virtual int SetSendBufferSize(int32_t size) = 0;
-};
+int Socket::ReadIfReady(IOBuffer* buf,
+                        int buf_len,
+                        const CompletionCallback& callback) {
+  return ERR_READ_IF_READY_NOT_IMPLEMENTED;
+}
 
 }  // namespace net
-
-#endif  // NET_SOCKET_SOCKET_H_