Introduce HttpStream and HttpBasicStream.

net/http/http_stream.h

+// Copyright (c) 2009 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.
+//
+// HttpStream is an interface for reading and writing data to an HttpStream that
+// keeps the client agnostic of the actual underlying transport layer.  This
+// provides an abstraction for both a basic http stream as well as http
+// pipelining implementations.
+//
+// NOTE(willchan): This interface is a work in progress.  It will most likely
+// change, since for a pipelining implementation, the stream needs to contain
+// the http parsing code.  For symmetry, the writing methods will probably
+// contain the code for constructing http requests.
+
+#ifndef NET_HTTP_HTTP_STREAM_H_
+#define NET_HTTP_HTTP_STREAM_H_
+
+#include "base/basictypes.h"
+#include "net/base/completion_callback.h"
+
+namespace net {
+
+class IOBuffer;
+
+class HttpStream {
+ public:
+  HttpStream() {}
+  virtual ~HttpStream() {}
+
+  // Reads data, up to buf_len bytes, from the socket.  The number of bytes
+  // read is returned, or an error is returned upon failure.  Zero is returned
+  // to indicate end-of-file.  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 destroyed.
+  virtual int Read(IOBuffer* buf,
+                   int buf_len,
+                   CompletionCallback* callback) = 0;
+
+  // Writes data, up to buf_len bytes, to the socket.  Note: only part of the
+  // data may be written!  The number of bytes written is returned, or an error
+  // is returned upon failure.  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 destroyed.
+  // Implementations of this method should not modify the contents of the actual
+  // buffer that is written to the socket.
+  virtual int Write(IOBuffer* buf,
+                    int buf_len,
+                    CompletionCallback* callback) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(HttpStream);
+};
+
+}  // namespace net
+
+#endif  // NET_HTTP_HTTP_STREAM_H_