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// 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_SPDY_SPDY_STREAM_H_
#define NET_SPDY_SPDY_STREAM_H_
#include <deque>
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "base/memory/weak_ptr.h"
#include "net/base/bandwidth_metrics.h"
#include "net/base/io_buffer.h"
#include "net/base/net_export.h"
#include "net/base/net_log.h"
#include "net/base/request_priority.h"
#include "net/socket/ssl_client_socket.h"
#include "net/spdy/spdy_buffer.h"
#include "net/spdy/spdy_framer.h"
#include "net/spdy/spdy_header_block.h"
#include "net/spdy/spdy_protocol.h"
#include "net/ssl/server_bound_cert_service.h"
#include "net/ssl/ssl_client_cert_type.h"
#include "url/gurl.h"
namespace net {
class AddressList;
class IPEndPoint;
struct LoadTimingInfo;
class SSLCertRequestInfo;
class SSLInfo;
class SpdySession;
enum SpdyStreamType {
// The most general type of stream; there are no restrictions on
// when data can be sent and received.
SPDY_BIDIRECTIONAL_STREAM,
// A stream where the client sends a request with possibly a body,
// and the server then sends a response with a body.
SPDY_REQUEST_RESPONSE_STREAM,
// A server-initiated stream where the server just sends a response
// with a body and the client does not send anything.
SPDY_PUSH_STREAM
};
// Passed to some SpdyStream functions to indicate whether there's
// more data to send.
enum SpdySendStatus {
MORE_DATA_TO_SEND,
NO_MORE_DATA_TO_SEND
};
// Returned by SpdyStream::OnResponseHeadersUpdated() to indicate
// whether the current response headers are complete or not.
enum SpdyResponseHeadersStatus {
RESPONSE_HEADERS_ARE_INCOMPLETE,
RESPONSE_HEADERS_ARE_COMPLETE
};
// The SpdyStream is used by the SpdySession to represent each stream known
// on the SpdySession. This class provides interfaces for SpdySession to use.
// Streams can be created either by the client or by the server. When they
// are initiated by the client, both the SpdySession and client object (such as
// a SpdyNetworkTransaction) will maintain a reference to the stream. When
// initiated by the server, only the SpdySession will maintain any reference,
// until such a time as a client object requests a stream for the path.
class NET_EXPORT_PRIVATE SpdyStream {
public:
// Delegate handles protocol specific behavior of spdy stream.
class NET_EXPORT_PRIVATE Delegate {
public:
Delegate() {}
// Called when the request headers have been sent. Never called
// for push streams. Must not cause the stream to be closed.
virtual void OnRequestHeadersSent() = 0;
// WARNING: This function is complicated! Be sure to read the
// whole comment below if you're working with code that implements
// or calls this function.
//
// Called when the response headers are updated from the
// server. |response_headers| contains the set of all headers
// received up to this point; delegates can assume that any
// headers previously received remain unchanged.
//
// This is called at least once before any data is received. If
// RESPONSE_HEADERS_ARE_INCOMPLETE is returned, this will be
// called again when more headers are received until
// RESPONSE_HEADERS_ARE_COMPLETE is returned, and any data
// received before then will be treated as a protocol error.
//
// If RESPONSE_HEADERS_ARE_INCOMPLETE is returned, the delegate
// must not have closed the stream. Otherwise, if
// RESPONSE_HEADERS_ARE_COMPLETE is returned, the delegate has
// processed the headers successfully. However, it still may have
// closed the stream, e.g. if the headers indicated an error
// condition.
//
// Some type-specific behavior:
//
// - For bidirectional streams, this may be called even after
// data is received, but it is expected that
// RESPONSE_HEADERS_ARE_COMPLETE is always returned. If
// RESPONSE_HEADERS_ARE_INCOMPLETE is returned, this is
// treated as a protocol error.
//
// - For request/response streams, this function is called
// exactly once before data is received, and it is expected
// that RESPONSE_HEADERS_ARE_COMPLETE is returned. If
// RESPONSE_HEADERS_ARE_INCOMPLETE is returned, this is
// treated as a protocol error.
//
// - For push streams, it is expected that this function will be
// called until RESPONSE_HEADERS_ARE_COMPLETE is returned
// before any data is received; any deviation from this is
// treated as a protocol error.
//
// TODO(akalin): Treat headers received after data has been
// received as a protocol error for non-bidirectional streams.
virtual SpdyResponseHeadersStatus OnResponseHeadersUpdated(
const SpdyHeaderBlock& response_headers) = 0;
// Called when data is received after all required response
// headers have been received. |buffer| may be NULL, which signals
// EOF. Must return OK if the data was received successfully, or
// a network error code otherwise.
//
// May cause the stream to be closed.
virtual void OnDataReceived(scoped_ptr<SpdyBuffer> buffer) = 0;
// Called when data is sent. Must not cause the stream to be
// closed.
virtual void OnDataSent() = 0;
// Called when SpdyStream is closed. No other delegate functions
// will be called after this is called, and the delegate must not
// access the stream after this is called. Must not cause the
// stream to be be (re-)closed.
//
// TODO(akalin): Allow this function to re-close the stream and
// handle it gracefully.
virtual void OnClose(int status) = 0;
protected:
virtual ~Delegate() {}
private:
DISALLOW_COPY_AND_ASSIGN(Delegate);
};
// SpdyStream constructor
SpdyStream(SpdyStreamType type,
const base::WeakPtr<SpdySession>& session,
const GURL& url,
RequestPriority priority,
int32 initial_send_window_size,
int32 initial_recv_window_size,
const BoundNetLog& net_log);
~SpdyStream();
// Set the delegate, which must not be NULL. Must not be called more
// than once. For push streams, calling this may cause buffered data
// to be sent to the delegate (from a posted task).
void SetDelegate(Delegate* delegate);
// Detach the delegate from the stream, which must not yet be
// closed, and cancel it.
void DetachDelegate();
// The time at which the first bytes of the response were received
// from the server, or null if the response hasn't been received
// yet.
base::Time response_time() const { return response_time_; }
SpdyStreamType type() const { return type_; }
SpdyStreamId stream_id() const { return stream_id_; }
void set_stream_id(SpdyStreamId stream_id) { stream_id_ = stream_id; }
const GURL& url() const { return url_; }
RequestPriority priority() const { return priority_; }
int32 send_window_size() const { return send_window_size_; }
int32 recv_window_size() const { return recv_window_size_; }
bool send_stalled_by_flow_control() const {
return send_stalled_by_flow_control_;
}
void set_send_stalled_by_flow_control(bool stalled) {
send_stalled_by_flow_control_ = stalled;
}
// Called by the session to adjust this stream's send window size by
// |delta_window_size|, which is the difference between the
// SETTINGS_INITIAL_WINDOW_SIZE in the most recent SETTINGS frame
// and the previous initial send window size, possibly unstalling
// this stream. Although |delta_window_size| may cause this stream's
// send window size to go negative, it must not cause it to wrap
// around in either direction. Does nothing if the stream is already
// closed.
//
// If stream flow control is turned off, this must not be called.
void AdjustSendWindowSize(int32 delta_window_size);
// Called when bytes are consumed from a SpdyBuffer for a DATA frame
// that is to be written or is being written. Increases the send
// window size accordingly if some or all of the SpdyBuffer is being
// discarded.
//
// If stream flow control is turned off, this must not be called.
void OnWriteBufferConsumed(size_t frame_payload_size,
size_t consume_size,
SpdyBuffer::ConsumeSource consume_source);
// Called by the session to increase this stream's send window size
// by |delta_window_size| (which must be at least 1) from a received
// WINDOW_UPDATE frame or from a dropped DATA frame that was
// intended to be sent, possibly unstalling this stream. If
// |delta_window_size| would cause this stream's send window size to
// overflow, calls into the session to reset this stream. Does
// nothing if the stream is already closed.
//
// If stream flow control is turned off, this must not be called.
void IncreaseSendWindowSize(int32 delta_window_size);
// If stream flow control is turned on, called by the session to
// decrease this stream's send window size by |delta_window_size|,
// which must be at least 0 and at most kMaxSpdyFrameChunkSize.
// |delta_window_size| must not cause this stream's send window size
// to go negative. Does nothing if the stream is already closed.
//
// If stream flow control is turned off, this must not be called.
void DecreaseSendWindowSize(int32 delta_window_size);
// Called when bytes are consumed by the delegate from a SpdyBuffer
// containing received data. Increases the receive window size
// accordingly.
//
// If stream flow control is turned off, this must not be called.
void OnReadBufferConsumed(size_t consume_size,
SpdyBuffer::ConsumeSource consume_source);
// Called by OnReadBufferConsume to increase this stream's receive
// window size by |delta_window_size|, which must be at least 1 and
// must not cause this stream's receive window size to overflow,
// possibly also sending a WINDOW_UPDATE frame. Does nothing if the
// stream is not active.
//
// If stream flow control is turned off, this must not be called.
void IncreaseRecvWindowSize(int32 delta_window_size);
// Called by OnDataReceived (which is in turn called by the session)
// to decrease this stream's receive window size by
// |delta_window_size|, which must be at least 1 and must not cause
// this stream's receive window size to go negative.
//
// If stream flow control is turned off or the stream is not active,
// this must not be called.
void DecreaseRecvWindowSize(int32 delta_window_size);
int GetPeerAddress(IPEndPoint* address) const;
int GetLocalAddress(IPEndPoint* address) const;
// Returns true if the underlying transport socket ever had any reads or
// writes.
bool WasEverUsed() const;
const BoundNetLog& net_log() const { return net_log_; }
base::Time GetRequestTime() const;
void SetRequestTime(base::Time t);
// Called at most once by the SpdySession when the initial response
// headers have been received for this stream, i.e., a SYN_REPLY (or
// SYN_STREAM for push streams) frame has been received. This is the
// entry point for a push stream. Returns a status code; if it is
// an error, the stream was closed by this function.
int OnInitialResponseHeadersReceived(const SpdyHeaderBlock& response_headers,
base::Time response_time,
base::TimeTicks recv_first_byte_time);
// Called by the SpdySession (only after
// OnInitialResponseHeadersReceived() has been called) when
// late-bound headers are received for a stream. Returns a status
// code; if it is an error, the stream was closed by this function.
int OnAdditionalResponseHeadersReceived(
const SpdyHeaderBlock& additional_response_headers);
// Called by the SpdySession when response data has been received
// for this stream. This callback may be called multiple times as
// data arrives from the network, and will never be called prior to
// OnResponseHeadersReceived.
//
// |buffer| contains the data received, or NULL if the stream is
// being closed. The stream must copy any data from this
// buffer before returning from this callback.
//
// |length| is the number of bytes received (at most 2^24 - 1) or 0 if
// the stream is being closed.
void OnDataReceived(scoped_ptr<SpdyBuffer> buffer);
// Called by the SpdySession when a frame has been successfully and
// completely written. |frame_size| is the total size of the frame
// in bytes, including framing overhead.
void OnFrameWriteComplete(SpdyFrameType frame_type, size_t frame_size);
// Called by the SpdySession when the request is finished. This callback
// will always be called at the end of the request and signals to the
// stream that the stream has no more network events. No further callbacks
// to the stream will be made after this call.
// |status| is an error code or OK.
void OnClose(int status);
// Called by the SpdySession to log stream related errors.
void LogStreamError(int status, const std::string& description);
// If this stream is active, reset it, and close it otherwise. In
// either case the stream is deleted.
void Cancel();
// Close this stream without sending a RST_STREAM and delete
// it.
void Close();
// Must be used only by |session_|.
base::WeakPtr<SpdyStream> GetWeakPtr();
// Interface for the delegate to use.
// Only one send can be in flight at a time, except for push
// streams, which must not send anything.
// Sends the request headers. The delegate is called back via
// OnRequestHeadersSent() when the request headers have completed
// sending. |send_status| must be MORE_DATA_TO_SEND for
// bidirectional streams; for request/response streams, it must be
// MORE_DATA_TO_SEND if the request has data to upload, or
// NO_MORE_DATA_TO_SEND if not.
int SendRequestHeaders(scoped_ptr<SpdyHeaderBlock> request_headers,
SpdySendStatus send_status);
// Sends a DATA frame. The delegate will be notified via
// OnDataSent() when the send is complete. |send_status| must be
// MORE_DATA_TO_SEND for bidirectional streams; for request/response
// streams, it must be MORE_DATA_TO_SEND if there is more data to
// upload, or NO_MORE_DATA_TO_SEND if not.
void SendData(IOBuffer* data, int length, SpdySendStatus send_status);
// Fills SSL info in |ssl_info| and returns true when SSL is in use.
bool GetSSLInfo(SSLInfo* ssl_info,
bool* was_npn_negotiated,
NextProto* protocol_negotiated);
// Fills SSL Certificate Request info |cert_request_info| and returns
// true when SSL is in use.
bool GetSSLCertRequestInfo(SSLCertRequestInfo* cert_request_info);
// If the stream is stalled on sending data, but the session is not
// stalled on sending data and |send_window_size_| is positive, then
// set |send_stalled_by_flow_control_| to false and unstall the data
// sending. Called by the session or by the stream itself. Must be
// called only when the stream is still open.
void PossiblyResumeIfSendStalled();
// Returns whether or not this stream is closed. Note that the only
// time a stream is closed and not deleted is in its delegate's
// OnClose() method.
bool IsClosed() const;
// Returns whether or not this stream has finished sending its
// request headers and is ready to send/receive more data.
bool IsIdle() const;
// Returns the protocol used by this stream. Always between
// kProtoSPDYMinimumVersion and kProtoSPDYMaximumVersion.
NextProto GetProtocol() const;
int response_status() const { return response_status_; }
bool GetLoadTimingInfo(LoadTimingInfo* load_timing_info) const;
// Get the URL from the appropriate stream headers, or the empty
// GURL() if it is unknown.
//
// TODO(akalin): Figure out if we really need this function,
// i.e. can we just use the URL this stream was created with and/or
// one we receive headers validate that the URL from them is the
// same.
GURL GetUrlFromHeaders() const;
// Returns whether the URL for this stream is known.
//
// TODO(akalin): Remove this, as it's only used in tests.
bool HasUrlFromHeaders() const;
int GetProtocolVersion() const;
private:
class SynStreamBufferProducer;
class HeaderBufferProducer;
enum State {
STATE_NONE,
STATE_SEND_REQUEST_HEADERS,
STATE_SEND_REQUEST_HEADERS_COMPLETE,
STATE_IDLE,
STATE_CLOSED
};
// Try to make progress sending/receiving the request/response.
int DoLoop(int result);
// The implementations of each state of the state machine.
int DoSendRequestHeaders();
int DoSendRequestHeadersComplete();
int DoReadHeaders();
int DoReadHeadersComplete(int result);
int DoOpen();
// Update the histograms. Can safely be called repeatedly, but should only
// be called after the stream has completed.
void UpdateHistograms();
// When a server-pushed stream is first created, this function is
// posted on the current MessageLoop to replay the data that the
// server has already sent.
void PushedStreamReplayData();
// Produces the SYN_STREAM frame for the stream. The stream must
// already be activated.
scoped_ptr<SpdyFrame> ProduceSynStreamFrame();
// Produce the initial HEADER frame for the stream with the given
// block. The stream must already be activated.
scoped_ptr<SpdyFrame> ProduceHeaderFrame(
scoped_ptr<SpdyHeaderBlock> header_block);
// Queues the send for next frame of the remaining data in
// |pending_send_data_|. Must be called only when
// |pending_send_data_| is set.
void QueueNextDataFrame();
// Merge the given headers into |response_headers_| and calls
// OnResponseHeadersUpdated() on the delegate (if attached).
// Returns a status code; if it is an error, the stream was closed
// by this function.
int MergeWithResponseHeaders(const SpdyHeaderBlock& new_response_headers);
const SpdyStreamType type_;
base::WeakPtrFactory<SpdyStream> weak_ptr_factory_;
// Sentinel variable used to make sure we don't get destroyed by a
// function called from DoLoop().
bool in_do_loop_;
// There is a small period of time between when a server pushed stream is
// first created, and the pushed data is replayed. Any data received during
// this time should continue to be buffered.
bool continue_buffering_data_;
SpdyStreamId stream_id_;
const GURL url_;
const RequestPriority priority_;
size_t slot_;
// Flow control variables.
bool send_stalled_by_flow_control_;
int32 send_window_size_;
int32 recv_window_size_;
int32 unacked_recv_window_bytes_;
ScopedBandwidthMetrics metrics_;
const base::WeakPtr<SpdySession> session_;
// The transaction should own the delegate.
SpdyStream::Delegate* delegate_;
// Whether or not we have more data to send on this stream.
SpdySendStatus send_status_;
// The headers for the request to send.
//
// TODO(akalin): Hang onto this only until we send it. This
// necessitates stashing the URL separately.
scoped_ptr<SpdyHeaderBlock> request_headers_;
// The data waiting to be sent.
scoped_refptr<DrainableIOBuffer> pending_send_data_;
// The time at which the request was made that resulted in this response.
// For cached responses, this time could be "far" in the past.
base::Time request_time_;
SpdyHeaderBlock response_headers_;
SpdyResponseHeadersStatus response_headers_status_;
base::Time response_time_;
State io_state_;
// Since we buffer the response, we also buffer the response status.
// Not valid until the stream is closed.
int response_status_;
BoundNetLog net_log_;
base::TimeTicks send_time_;
base::TimeTicks recv_first_byte_time_;
base::TimeTicks recv_last_byte_time_;
// Number of data bytes that have been sent/received on this stream, not
// including frame overhead. Note that this does not count headers.
int send_bytes_;
int recv_bytes_;
// Data received before delegate is attached.
ScopedVector<SpdyBuffer> pending_buffers_;
std::string domain_bound_private_key_;
std::string domain_bound_cert_;
ServerBoundCertService::RequestHandle domain_bound_cert_request_handle_;
// When OnFrameWriteComplete() is called, these variables are set.
SpdyFrameType just_completed_frame_type_;
size_t just_completed_frame_size_;
DISALLOW_COPY_AND_ASSIGN(SpdyStream);
};
} // namespace net
#endif // NET_SPDY_SPDY_STREAM_H_