net/http/http_stream_factory_job.h - chromium/src - Git at Google

 // 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_HTTP_HTTP_STREAM_FACTORY_JOB_H_
 #define NET_HTTP_HTTP_STREAM_FACTORY_JOB_H_

 #include <memory>
 #include <utility>

 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "net/base/completion_repeating_callback.h"
 #include "net/base/net_export.h"
 #include "net/base/proxy_server.h"
 #include "net/base/request_priority.h"
 #include "net/http/bidirectional_stream_impl.h"
 #include "net/http/http_auth.h"
 #include "net/http/http_auth_controller.h"
 #include "net/http/http_request_info.h"
 #include "net/http/http_stream_factory.h"
 #include "net/http/http_stream_request.h"
 #include "net/log/net_log_with_source.h"
 #include "net/proxy_resolution/proxy_resolution_service.h"
 #include "net/quic/quic_stream_factory.h"
 #include "net/socket/client_socket_handle.h"
 #include "net/socket/client_socket_pool.h"
 #include "net/socket/client_socket_pool_manager.h"
 #include "net/socket/next_proto.h"
 #include "net/socket/ssl_client_socket.h"
 #include "net/spdy/spdy_session_key.h"
 #include "net/ssl/ssl_config_service.h"

 namespace net {

 namespace test {

 class HttpStreamFactoryJobPeer;

 }  // namespace test

 class ClientSocketHandle;
 class HttpAuthController;
 class HttpNetworkSession;
 class HttpStream;
 class SpdySessionPool;
 class NetLog;
 struct SSLConfig;

 // An HttpStreamRequest exists for each stream which is in progress of being
 // created for the HttpStreamFactory.
 class HttpStreamFactory::Job {
  public:
   // For jobs issued simultaneously to an HTTP/2 supported server, a delay is
   // applied to avoid unnecessary socket connection establishments.
   // https://crbug.com/718576
   static const int kHTTP2ThrottleMs = 300;

   // Delegate to report Job's status to HttpStreamRequest and HttpStreamFactory.
   class NET_EXPORT_PRIVATE Delegate {
    public:
     virtual ~Delegate() {}

     // Invoked when |job| has an HttpStream ready.
     virtual void OnStreamReady(Job* job, const SSLConfig& used_ssl_config) = 0;

     // Invoked when |job| has a BidirectionalStream ready.
     virtual void OnBidirectionalStreamImplReady(
         Job* job,
         const SSLConfig& used_ssl_config,
         const ProxyInfo& used_proxy_info) = 0;

     // Invoked when |job| has a WebSocketHandshakeStream ready.
     virtual void OnWebSocketHandshakeStreamReady(
         Job* job,
         const SSLConfig& used_ssl_config,
         const ProxyInfo& used_proxy_info,
         std::unique_ptr<WebSocketHandshakeStreamBase> stream) = 0;

     // Invoked when |job| fails to create a stream.
     virtual void OnStreamFailed(Job* job,
                                 int status,
                                 const SSLConfig& used_ssl_config) = 0;

     // Invoked when |job| fails on the default network.
     virtual void OnFailedOnDefaultNetwork(Job* job) = 0;

     // Invoked when |job| has a certificate error for the HttpStreamRequest.
     virtual void OnCertificateError(Job* job,
                                     int status,
                                     const SSLConfig& used_ssl_config,
                                     const SSLInfo& ssl_info) = 0;

     // Invoked when |job| has a failure of the CONNECT request (due to a 302
     // redirect) through an HTTPS proxy.
     virtual void OnHttpsProxyTunnelResponseRedirect(
         Job* job,
         const HttpResponseInfo& response_info,
         const SSLConfig& used_ssl_config,
         const ProxyInfo& used_proxy_info,
         std::unique_ptr<HttpStream> stream) = 0;

     // Invoked when |job| raises failure for SSL Client Auth.
     virtual void OnNeedsClientAuth(Job* job,
                                    const SSLConfig& used_ssl_config,
                                    SSLCertRequestInfo* cert_info) = 0;

     // Invoked when |job| needs proxy authentication.
     virtual void OnNeedsProxyAuth(Job* job,
                                   const HttpResponseInfo& proxy_response,
                                   const SSLConfig& used_ssl_config,
                                   const ProxyInfo& used_proxy_info,
                                   HttpAuthController* auth_controller) = 0;

     // Returns true if the connection initialization to the proxy server
     // contained in |proxy_info| can be skipped.
     virtual bool OnInitConnection(const ProxyInfo& proxy_info) = 0;

     // Invoked to notify the HttpStreamRequest and HttpStreamFactory of the
     // readiness of new SPDY session.
     virtual void OnNewSpdySessionReady(
         Job* job,
         const base::WeakPtr<SpdySession>& spdy_session) = 0;

     // Invoked when the |job| finishes pre-connecting sockets.
     virtual void OnPreconnectsComplete(Job* job) = 0;

     // Invoked to record connection attempts made by the socket layer to
     // HttpStreamRequest if |job| is associated with HttpStreamRequest.
     virtual void AddConnectionAttemptsToRequest(
         Job* job,
         const ConnectionAttempts& attempts) = 0;

     // Invoked when |job| finishes initiating a connection.
     virtual void OnConnectionInitialized(Job* job, int rv) = 0;

     // Return false if |job| can advance to the next state. Otherwise, |job|
     // will wait for Job::Resume() to be called before advancing.
     virtual bool ShouldWait(Job* job) = 0;

     // Called when |job| determines the appropriate |spdy_session_key| for the
     // HttpStreamRequest. Note that this does not mean that HTTP/2 is
     // necessarily supported for this SpdySessionKey, since we may need to wait
     // for ALPN negotiation to complete before knowing if HTTP/2 is available.
     virtual void SetSpdySessionKey(Job* job,
                                    const SpdySessionKey& spdy_session_key) = 0;

     // Remove session from the SpdySessionRequestMap.
     virtual void RemoveRequestFromSpdySessionRequestMapForJob(Job* job) = 0;

     virtual const NetLogWithSource* GetNetLog() const = 0;

     virtual WebSocketHandshakeStreamBase::CreateHelper*
     websocket_handshake_stream_create_helper() = 0;

     virtual void MaybeSetWaitTimeForMainJob(const base::TimeDelta& delay) = 0;
   };

   // Job is owned by |delegate|, hence |delegate| is valid for the lifetime of
   // the Job.
   //
   // |alternative_protocol| is the protocol required by Alternative Service, if
   // any:
   // * |alternative_protocol == kProtoUnknown| means that the Job can pool to an
   //   existing SpdySession, or bind to a idle TCP socket that might use either
   //   HTTP/1.1 or HTTP/2.
   // * |alternative_protocol == kProtoHTTP2| means that the Job can pool to an
   //   existing SpdySession, or bind to a idle TCP socket.  In the latter case,
   //   if the socket does not use HTTP/2, then the Job fails.
   // * |alternative_protocol == kProtoQUIC| means that the Job can pool to an
   //   existing QUIC connection or open a new one.
   // Note that this can be overwritten by specifying a QUIC proxy in
   // |proxy_info|, or by setting
   // HttpNetworkSession::Params::origins_to_force_quic_on.
   //
   // If |alternative_proxy_server| is a valid proxy server, then the Job will
   // use that instead of using ProxyResolutionService for proxy resolution.
   // Further, if |alternative_proxy_server| is a valid but bad proxy, then
   // fallback proxies are not used. It is illegal to call this constructor with
   // a valid |alternative_proxy_server| and an |alternate_protocol| different
   // from kProtoUnknown.
   Job(Delegate* delegate,
       JobType job_type,
       HttpNetworkSession* session,
       const HttpRequestInfo& request_info,
       RequestPriority priority,
       const ProxyInfo& proxy_info,
       const SSLConfig& server_ssl_config,
       const SSLConfig& proxy_ssl_config,
       HostPortPair destination,
       GURL origin_url,
       NextProto alternative_protocol,
       quic::QuicTransportVersion quic_version,
       const ProxyServer& alternative_proxy_server,
       bool is_websocket,
       bool enable_ip_based_pooling,
       NetLog* net_log);
   virtual ~Job();

   // Start initiates the process of creating a new HttpStream.
   // |delegate_| will be notified upon completion.
   void Start(HttpStreamRequest::StreamType stream_type);

   // Preconnect will attempt to request |num_streams| sockets from the
   // appropriate ClientSocketPool.
   int Preconnect(int num_streams);

   int RestartTunnelWithProxyAuth();
   LoadState GetLoadState() const;

   // Tells |this| that |delegate_| has determined it still needs to continue
   // connecting.
   virtual void Resume();

   // Called when |this| is orphaned by Delegate. This is valid for
   // ALTERNATIVE job only.
   void Orphan();

   void SetPriority(RequestPriority priority);

   RequestPriority priority() const { return priority_; }
   bool was_alpn_negotiated() const;
   NextProto negotiated_protocol() const;
   bool using_spdy() const;
   const NetLogWithSource& net_log() const { return net_log_; }
   HttpStreamRequest::StreamType stream_type() const { return stream_type_; }

   std::unique_ptr<HttpStream> ReleaseStream() { return std::move(stream_); }

   std::unique_ptr<BidirectionalStreamImpl> ReleaseBidirectionalStream() {
     return std::move(bidirectional_stream_impl_);
   }

   // Returns the estimated memory usage in bytes.
   size_t EstimateMemoryUsage() const;

   bool is_waiting() const { return next_state_ == STATE_WAIT_COMPLETE; }
   const SSLConfig& server_ssl_config() const;
   const SSLConfig& proxy_ssl_config() const;
   const ProxyInfo& proxy_info() const;

   JobType job_type() const { return job_type_; }

   const ProxyServer alternative_proxy_server() const {
     return alternative_proxy_server_;
   }

   bool using_existing_quic_session() const {
     return using_existing_quic_session_;
   }

   bool using_quic() const { return using_quic_; }

   bool should_reconsider_proxy() const { return should_reconsider_proxy_; }

   NetErrorDetails* net_error_details() { return &net_error_details_; }

  private:
   friend class test::HttpStreamFactoryJobPeer;

   enum State {
     STATE_START,
     // The main and alternative jobs are started in parallel.  The main job
     // can wait if it's paused. The alternative job never waits.
     //
     // An HTTP/2 alternative job notifies the JobController in DoInitConnection
     // unless it can pool to an existing SpdySession.  JobController, in turn,
     // resumes the main job.
     //
     // A QUIC alternative job notifies the JobController in DoInitConnection
     // regardless of whether it pools to an existing QUIC session, but the main
     // job is only resumed after some delay.
     //
     // If the main job is resumed, then it races the alternative job.
     STATE_WAIT,
     STATE_WAIT_COMPLETE,

     STATE_EVALUATE_THROTTLE,
     STATE_INIT_CONNECTION,
     STATE_INIT_CONNECTION_COMPLETE,
     STATE_WAITING_USER_ACTION,
     STATE_CREATE_STREAM,
     STATE_CREATE_STREAM_COMPLETE,
     STATE_DRAIN_BODY_FOR_AUTH_RESTART,
     STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE,
     STATE_DONE,
     STATE_NONE,
     // Used for UMA.
     STATE_MAX,
   };

   void OnStreamReadyCallback();
   void OnBidirectionalStreamImplReadyCallback();
   void OnWebSocketHandshakeStreamReadyCallback();
   // This callback function is called when a new SPDY session is created.
   void OnNewSpdySessionReadyCallback();
   void OnStreamFailedCallback(int result);
   void OnCertificateErrorCallback(int result, const SSLInfo& ssl_info);
   void OnNeedsProxyAuthCallback(const HttpResponseInfo& response_info,
                                 HttpAuthController* auth_controller,
                                 base::OnceClosure restart_with_auth_callback);
   void OnNeedsClientAuthCallback(SSLCertRequestInfo* cert_info);
   void OnHttpsProxyTunnelResponseRedirectCallback(
       const HttpResponseInfo& response_info,
       std::unique_ptr<HttpStream> stream);
   void OnPreconnectsComplete();

   void OnIOComplete(int result);
   // RunLoop() finishes asynchronously and invokes one of the On* methods (see
   // above) when done.
   void RunLoop(int result);
   int DoLoop(int result);
   int StartInternal();
   int DoInitConnectionImpl();

   // If this is a QUIC alt job, then this function is called when host
   // resolution completes. It's called with the next result after host
   // resolution, not the result of host resolution itself.
   void OnQuicHostResolution(int result);

   // Invoked when the underlying connection fails on the default network.
   void OnFailedOnDefaultNetwork(int result);

   // Each of these methods corresponds to a State value.  Those with an input
   // argument receive the result from the previous state.  If a method returns
   // ERR_IO_PENDING, then the result from OnIOComplete will be passed to the
   // next state method as the result arg.
   int DoStart();
   int DoWait();
   int DoWaitComplete(int result);
   int DoEvaluateThrottle();
   int DoInitConnection();
   int DoInitConnectionComplete(int result);
   int DoWaitingUserAction(int result);
   int DoCreateStream();
   int DoCreateStreamComplete(int result);

   void ResumeInitConnection();
   // Creates a SpdyHttpStream or a BidirectionalStreamImpl from the given values
   // and sets to |stream_| or |bidirectional_stream_impl_| respectively. Does
   // nothing if |stream_factory_| is for WebSocket.
   int SetSpdyHttpStreamOrBidirectionalStreamImpl(
       base::WeakPtr<SpdySession> session);

   // Returns to STATE_INIT_CONNECTION and resets some state.
   void ReturnToStateInitConnection(bool close_connection);

   // Sets several fields of |ssl_config| based on the proxy info and other
   // factors.
   void InitSSLConfig(SSLConfig* ssl_config, bool is_proxy) const;

   // Retrieve SSLInfo from our SSL Socket.
   // This must only be called when we are using an SSLSocket.
   void GetSSLInfo(SSLInfo* ssl_info);

   // Called in Job constructor: should Job be forced to use QUIC.
   static bool ShouldForceQuic(HttpNetworkSession* session,
                               const HostPortPair& destination,
                               const GURL& origin_url,
                               const ProxyInfo& proxy_info);

   // Called in Job constructor. Use |spdy_session_key_| after construction.
   static SpdySessionKey GetSpdySessionKey(bool spdy_session_direct,
                                           const ProxyServer& proxy_server,
                                           const GURL& origin_url,
                                           PrivacyMode privacy_mode,
                                           const SocketTag& socket_tag);

   // Returns true if the current request can use an existing spdy session.
   bool CanUseExistingSpdySession() const;

   // Called when we encounter a network error that could be resolved by trying
   // a new proxy configuration.  If there is another proxy configuration to try
   // then this method sets next_state_ appropriately and returns either OK or
   // ERR_IO_PENDING depending on whether or not the new proxy configuration is
   // available synchronously or asynchronously.  Otherwise, the given error
   // code is simply returned.
   int ReconsiderProxyAfterError(int error);

   // Called to handle a certificate error.  Stores the certificate in the
   // allowed_bad_certs list. Returns the error code.
   int HandleCertificateError(int error);

   // Called to handle a client certificate request.
   int HandleCertificateRequest(int error);

   ClientSocketPoolManager::SocketGroupType GetSocketGroup() const;

   void MaybeCopyConnectionAttemptsFromSocketOrHandle();

   // Record histograms of latency until Connect() completes.
   static void LogHttpConnectedMetrics(const ClientSocketHandle& handle);

   // Invoked by the transport socket pool after host resolution is complete
   // to allow the connection to be aborted, if a matching SPDY session can
   // be found.  Will return ERR_SPDY_SESSION_ALREADY_EXISTS if such a
   // session is found, and OK otherwise.
   static int OnHostResolution(SpdySessionPool* spdy_session_pool,
                               const SpdySessionKey& spdy_session_key,
                               bool enable_ip_based_pooling,
                               bool is_websocket,
                               const AddressList& addresses,
                               const NetLogWithSource& net_log);

   const HttpRequestInfo request_info_;
   RequestPriority priority_;
   const ProxyInfo proxy_info_;
   SSLConfig server_ssl_config_;
   SSLConfig proxy_ssl_config_;
   const NetLogWithSource net_log_;

   const CompletionRepeatingCallback io_callback_;
   std::unique_ptr<ClientSocketHandle> connection_;
   HttpNetworkSession* const session_;

   State next_state_;

   // The server we are trying to reach, could be that of the origin or of the
   // alternative service (after applying host mapping rules).
   const HostPortPair destination_;

   // The origin url we're trying to reach. This url may be different from the
   // original request when host mapping rules are set-up.
   const GURL origin_url_;

   // Alternative proxy server that should be used by |this| to fetch the
   // request.
   const ProxyServer alternative_proxy_server_;

   // True if request is for Websocket.
   const bool is_websocket_;

   // True if WebSocket request is allowed to use a WebSocket-capable existing
   // HTTP/2 connection.  In this case FindAvailableSession() must be called with
   // |enable_websocket = true|.
   const bool try_websocket_over_http2_;

   // Enable pooling to a SpdySession with matching IP and certificate
   // even if the SpdySessionKey is different.
   const bool enable_ip_based_pooling_;

   // Unowned. |this| job is owned by |delegate_|.
   Delegate* const delegate_;

   const JobType job_type_;

   // True if handling a HTTPS request.
   const bool using_ssl_;

   // True if Job uses QUIC.
   const bool using_quic_;

   // quic::QuicTransportVersion that should be used to connect to the QUIC
   // server if Job uses QUIC.
   quic::QuicTransportVersion quic_version_;

   // True if Alternative Service protocol field requires that HTTP/2 is used.
   // In this case, Job fails if it cannot pool to an existing SpdySession and
   // the server does not negotiate HTTP/2 on a new socket.
   const bool expect_spdy_;

   // True if Job actually uses HTTP/2.
   bool using_spdy_;

   // True if this job might succeed with a different proxy config.
   bool should_reconsider_proxy_;

   QuicStreamRequest quic_request_;

   // Only valid for a QUIC job. Set when a QUIC connection is started. If true,
   // then OnQuicHostResolution() is expected to be called in the future.
   bool expect_on_quic_host_resolution_;

   // True if this job used an existing QUIC session.
   bool using_existing_quic_session_;

   // True when the tunnel is in the process of being established - we can't
   // read from the socket until the tunnel is done.
   bool establishing_tunnel_;

   std::unique_ptr<HttpStream> stream_;
   std::unique_ptr<WebSocketHandshakeStreamBase> websocket_stream_;
   std::unique_ptr<BidirectionalStreamImpl> bidirectional_stream_impl_;

   // True if we negotiated ALPN.
   bool was_alpn_negotiated_;

   // Protocol negotiated with the server.
   NextProto negotiated_protocol_;

   // 0 if we're not preconnecting. Otherwise, the number of streams to
   // preconnect.
   int num_streams_;

   // Initialized when we create a new SpdySession.
   base::WeakPtr<SpdySession> new_spdy_session_;

   // Initialized when we have an existing SpdySession.
   base::WeakPtr<SpdySession> existing_spdy_session_;

   // Once Job claims a pushed stream on a SpdySession, |pushed_stream_id_| is
   // the ID of the claimed stream, and |existing_spdy_session_| points to that
   // SpdySession.  Otherwise |pushed_stream_id_| is set to kNoPushedStreamFound
   // (but |existing_spdy_session_| can still be non-null).
   spdy::SpdyStreamId pushed_stream_id_;

   // True if not connecting to an Https proxy for an Http url.
   const bool spdy_session_direct_;

   const SpdySessionKey spdy_session_key_;

   // Type of stream that is requested.
   HttpStreamRequest::StreamType stream_type_;

   // Whether Job has continued to DoInitConnection().
   bool init_connection_already_resumed_;

   base::OnceClosure restart_with_auth_callback_;

   NetErrorDetails net_error_details_;

   base::WeakPtrFactory<Job> ptr_factory_;

   DISALLOW_COPY_AND_ASSIGN(Job);
 };

 // Factory for creating Jobs.
 class HttpStreamFactory::JobFactory {
  public:
   JobFactory();

   virtual ~JobFactory();

   virtual std::unique_ptr<HttpStreamFactory::Job> CreateMainJob(
       HttpStreamFactory::Job::Delegate* delegate,
       HttpStreamFactory::JobType job_type,
       HttpNetworkSession* session,
       const HttpRequestInfo& request_info,
       RequestPriority priority,
       const ProxyInfo& proxy_info,
       const SSLConfig& server_ssl_config,
       const SSLConfig& proxy_ssl_config,
       HostPortPair destination,
       GURL origin_url,
       bool is_websocket,
       bool enable_ip_based_pooling,
       NetLog* net_log);

   virtual std::unique_ptr<HttpStreamFactory::Job> CreateAltSvcJob(
       HttpStreamFactory::Job::Delegate* delegate,
       HttpStreamFactory::JobType job_type,
       HttpNetworkSession* session,
       const HttpRequestInfo& request_info,
       RequestPriority priority,
       const ProxyInfo& proxy_info,
       const SSLConfig& server_ssl_config,
       const SSLConfig& proxy_ssl_config,
       HostPortPair destination,
       GURL origin_url,
       NextProto alternative_protocol,
       quic::QuicTransportVersion quic_version,
       bool is_websocket,
       bool enable_ip_based_pooling,
       NetLog* net_log);

   virtual std::unique_ptr<HttpStreamFactory::Job> CreateAltProxyJob(
       HttpStreamFactory::Job::Delegate* delegate,
       HttpStreamFactory::JobType job_type,
       HttpNetworkSession* session,
       const HttpRequestInfo& request_info,
       RequestPriority priority,
       const ProxyInfo& proxy_info,
       const SSLConfig& server_ssl_config,
       const SSLConfig& proxy_ssl_config,
       HostPortPair destination,
       GURL origin_url,
       const ProxyServer& alternative_proxy_server,
       bool is_websocket,
       bool enable_ip_based_pooling,
       NetLog* net_log);
 };

 }  // namespace net

 #endif  // NET_HTTP_HTTP_STREAM_FACTORY_JOB_H_
	// 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_HTTP_HTTP_STREAM_FACTORY_JOB_H_
	#define NET_HTTP_HTTP_STREAM_FACTORY_JOB_H_

	#include <memory>
	#include <utility>

	#include "base/macros.h"
	#include "base/memory/ref_counted.h"
	#include "base/memory/weak_ptr.h"
	#include "base/time/time.h"
	#include "net/base/completion_repeating_callback.h"
	#include "net/base/net_export.h"
	#include "net/base/proxy_server.h"
	#include "net/base/request_priority.h"
	#include "net/http/bidirectional_stream_impl.h"
	#include "net/http/http_auth.h"
	#include "net/http/http_auth_controller.h"
	#include "net/http/http_request_info.h"
	#include "net/http/http_stream_factory.h"
	#include "net/http/http_stream_request.h"
	#include "net/log/net_log_with_source.h"
	#include "net/proxy_resolution/proxy_resolution_service.h"
	#include "net/quic/quic_stream_factory.h"
	#include "net/socket/client_socket_handle.h"
	#include "net/socket/client_socket_pool.h"
	#include "net/socket/client_socket_pool_manager.h"
	#include "net/socket/next_proto.h"
	#include "net/socket/ssl_client_socket.h"
	#include "net/spdy/spdy_session_key.h"
	#include "net/ssl/ssl_config_service.h"

	namespace net {

	namespace test {

	class HttpStreamFactoryJobPeer;

	} // namespace test

	class ClientSocketHandle;
	class HttpAuthController;
	class HttpNetworkSession;
	class HttpStream;
	class SpdySessionPool;
	class NetLog;
	struct SSLConfig;

	// An HttpStreamRequest exists for each stream which is in progress of being
	// created for the HttpStreamFactory.
	class HttpStreamFactory::Job {
	public:
	// For jobs issued simultaneously to an HTTP/2 supported server, a delay is
	// applied to avoid unnecessary socket connection establishments.
	// https://crbug.com/718576
	static const int kHTTP2ThrottleMs = 300;

	// Delegate to report Job's status to HttpStreamRequest and HttpStreamFactory.
	class NET_EXPORT_PRIVATE Delegate {
	public:
	virtual ~Delegate() {}

	// Invoked when \|job\| has an HttpStream ready.
	virtual void OnStreamReady(Job* job, const SSLConfig& used_ssl_config) = 0;

	// Invoked when \|job\| has a BidirectionalStream ready.
	virtual void OnBidirectionalStreamImplReady(
	Job* job,
	const SSLConfig& used_ssl_config,
	const ProxyInfo& used_proxy_info) = 0;

	// Invoked when \|job\| has a WebSocketHandshakeStream ready.
	virtual void OnWebSocketHandshakeStreamReady(
	Job* job,
	const SSLConfig& used_ssl_config,
	const ProxyInfo& used_proxy_info,
	std::unique_ptr<WebSocketHandshakeStreamBase> stream) = 0;

	// Invoked when \|job\| fails to create a stream.
	virtual void OnStreamFailed(Job* job,
	int status,
	const SSLConfig& used_ssl_config) = 0;

	// Invoked when \|job\| fails on the default network.
	virtual void OnFailedOnDefaultNetwork(Job* job) = 0;

	// Invoked when \|job\| has a certificate error for the HttpStreamRequest.
	virtual void OnCertificateError(Job* job,
	int status,
	const SSLConfig& used_ssl_config,
	const SSLInfo& ssl_info) = 0;

	// Invoked when \|job\| has a failure of the CONNECT request (due to a 302
	// redirect) through an HTTPS proxy.
	virtual void OnHttpsProxyTunnelResponseRedirect(
	Job* job,
	const HttpResponseInfo& response_info,
	const SSLConfig& used_ssl_config,
	const ProxyInfo& used_proxy_info,
	std::unique_ptr<HttpStream> stream) = 0;

	// Invoked when \|job\| raises failure for SSL Client Auth.
	virtual void OnNeedsClientAuth(Job* job,
	const SSLConfig& used_ssl_config,
	SSLCertRequestInfo* cert_info) = 0;

	// Invoked when \|job\| needs proxy authentication.
	virtual void OnNeedsProxyAuth(Job* job,
	const HttpResponseInfo& proxy_response,
	const SSLConfig& used_ssl_config,
	const ProxyInfo& used_proxy_info,
	HttpAuthController* auth_controller) = 0;

	// Returns true if the connection initialization to the proxy server
	// contained in \|proxy_info\| can be skipped.
	virtual bool OnInitConnection(const ProxyInfo& proxy_info) = 0;

	// Invoked to notify the HttpStreamRequest and HttpStreamFactory of the
	// readiness of new SPDY session.
	virtual void OnNewSpdySessionReady(
	Job* job,
	const base::WeakPtr<SpdySession>& spdy_session) = 0;

	// Invoked when the \|job\| finishes pre-connecting sockets.
	virtual void OnPreconnectsComplete(Job* job) = 0;

	// Invoked to record connection attempts made by the socket layer to
	// HttpStreamRequest if \|job\| is associated with HttpStreamRequest.
	virtual void AddConnectionAttemptsToRequest(
	Job* job,
	const ConnectionAttempts& attempts) = 0;

	// Invoked when \|job\| finishes initiating a connection.
	virtual void OnConnectionInitialized(Job* job, int rv) = 0;

	// Return false if \|job\| can advance to the next state. Otherwise, \|job\|
	// will wait for Job::Resume() to be called before advancing.
	virtual bool ShouldWait(Job* job) = 0;

	// Called when \|job\| determines the appropriate \|spdy_session_key\| for the
	// HttpStreamRequest. Note that this does not mean that HTTP/2 is
	// necessarily supported for this SpdySessionKey, since we may need to wait
	// for ALPN negotiation to complete before knowing if HTTP/2 is available.
	virtual void SetSpdySessionKey(Job* job,
	const SpdySessionKey& spdy_session_key) = 0;

	// Remove session from the SpdySessionRequestMap.
	virtual void RemoveRequestFromSpdySessionRequestMapForJob(Job* job) = 0;

	virtual const NetLogWithSource* GetNetLog() const = 0;

	virtual WebSocketHandshakeStreamBase::CreateHelper*
	websocket_handshake_stream_create_helper() = 0;

	virtual void MaybeSetWaitTimeForMainJob(const base::TimeDelta& delay) = 0;
	};

	// Job is owned by \|delegate\|, hence \|delegate\| is valid for the lifetime of
	// the Job.
	//
	// \|alternative_protocol\| is the protocol required by Alternative Service, if
	// any:
	// * \|alternative_protocol == kProtoUnknown\| means that the Job can pool to an
	// existing SpdySession, or bind to a idle TCP socket that might use either
	// HTTP/1.1 or HTTP/2.
	// * \|alternative_protocol == kProtoHTTP2\| means that the Job can pool to an
	// existing SpdySession, or bind to a idle TCP socket. In the latter case,
	// if the socket does not use HTTP/2, then the Job fails.
	// * \|alternative_protocol == kProtoQUIC\| means that the Job can pool to an
	// existing QUIC connection or open a new one.
	// Note that this can be overwritten by specifying a QUIC proxy in
	// \|proxy_info\|, or by setting
	// HttpNetworkSession::Params::origins_to_force_quic_on.
	//
	// If \|alternative_proxy_server\| is a valid proxy server, then the Job will
	// use that instead of using ProxyResolutionService for proxy resolution.
	// Further, if \|alternative_proxy_server\| is a valid but bad proxy, then
	// fallback proxies are not used. It is illegal to call this constructor with
	// a valid \|alternative_proxy_server\| and an \|alternate_protocol\| different
	// from kProtoUnknown.
	Job(Delegate* delegate,
	JobType job_type,
	HttpNetworkSession* session,
	const HttpRequestInfo& request_info,
	RequestPriority priority,
	const ProxyInfo& proxy_info,
	const SSLConfig& server_ssl_config,
	const SSLConfig& proxy_ssl_config,
	HostPortPair destination,
	GURL origin_url,
	NextProto alternative_protocol,
	quic::QuicTransportVersion quic_version,
	const ProxyServer& alternative_proxy_server,
	bool is_websocket,
	bool enable_ip_based_pooling,
	NetLog* net_log);
	virtual ~Job();

	// Start initiates the process of creating a new HttpStream.
	// \|delegate_\| will be notified upon completion.
	void Start(HttpStreamRequest::StreamType stream_type);

	// Preconnect will attempt to request \|num_streams\| sockets from the
	// appropriate ClientSocketPool.
	int Preconnect(int num_streams);

	int RestartTunnelWithProxyAuth();
	LoadState GetLoadState() const;

	// Tells \|this\| that \|delegate_\| has determined it still needs to continue
	// connecting.
	virtual void Resume();

	// Called when \|this\| is orphaned by Delegate. This is valid for
	// ALTERNATIVE job only.
	void Orphan();

	void SetPriority(RequestPriority priority);

	RequestPriority priority() const { return priority_; }
	bool was_alpn_negotiated() const;
	NextProto negotiated_protocol() const;
	bool using_spdy() const;
	const NetLogWithSource& net_log() const { return net_log_; }
	HttpStreamRequest::StreamType stream_type() const { return stream_type_; }

	std::unique_ptr<HttpStream> ReleaseStream() { return std::move(stream_); }

	std::unique_ptr<BidirectionalStreamImpl> ReleaseBidirectionalStream() {
	return std::move(bidirectional_stream_impl_);
	}

	// Returns the estimated memory usage in bytes.
	size_t EstimateMemoryUsage() const;

	bool is_waiting() const { return next_state_ == STATE_WAIT_COMPLETE; }
	const SSLConfig& server_ssl_config() const;
	const SSLConfig& proxy_ssl_config() const;
	const ProxyInfo& proxy_info() const;

	JobType job_type() const { return job_type_; }

	const ProxyServer alternative_proxy_server() const {
	return alternative_proxy_server_;
	}

	bool using_existing_quic_session() const {
	return using_existing_quic_session_;
	}

	bool using_quic() const { return using_quic_; }

	bool should_reconsider_proxy() const { return should_reconsider_proxy_; }

	NetErrorDetails* net_error_details() { return &net_error_details_; }

	private:
	friend class test::HttpStreamFactoryJobPeer;

	enum State {
	STATE_START,
	// The main and alternative jobs are started in parallel. The main job
	// can wait if it's paused. The alternative job never waits.
	//
	// An HTTP/2 alternative job notifies the JobController in DoInitConnection
	// unless it can pool to an existing SpdySession. JobController, in turn,
	// resumes the main job.
	//
	// A QUIC alternative job notifies the JobController in DoInitConnection
	// regardless of whether it pools to an existing QUIC session, but the main
	// job is only resumed after some delay.
	//
	// If the main job is resumed, then it races the alternative job.
	STATE_WAIT,
	STATE_WAIT_COMPLETE,

	STATE_EVALUATE_THROTTLE,
	STATE_INIT_CONNECTION,
	STATE_INIT_CONNECTION_COMPLETE,
	STATE_WAITING_USER_ACTION,
	STATE_CREATE_STREAM,
	STATE_CREATE_STREAM_COMPLETE,
	STATE_DRAIN_BODY_FOR_AUTH_RESTART,
	STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE,
	STATE_DONE,
	STATE_NONE,
	// Used for UMA.
	STATE_MAX,
	};

	void OnStreamReadyCallback();
	void OnBidirectionalStreamImplReadyCallback();
	void OnWebSocketHandshakeStreamReadyCallback();
	// This callback function is called when a new SPDY session is created.
	void OnNewSpdySessionReadyCallback();
	void OnStreamFailedCallback(int result);
	void OnCertificateErrorCallback(int result, const SSLInfo& ssl_info);
	void OnNeedsProxyAuthCallback(const HttpResponseInfo& response_info,
	HttpAuthController* auth_controller,
	base::OnceClosure restart_with_auth_callback);
	void OnNeedsClientAuthCallback(SSLCertRequestInfo* cert_info);
	void OnHttpsProxyTunnelResponseRedirectCallback(
	const HttpResponseInfo& response_info,
	std::unique_ptr<HttpStream> stream);
	void OnPreconnectsComplete();

	void OnIOComplete(int result);
	// RunLoop() finishes asynchronously and invokes one of the On* methods (see
	// above) when done.
	void RunLoop(int result);
	int DoLoop(int result);
	int StartInternal();
	int DoInitConnectionImpl();

	// If this is a QUIC alt job, then this function is called when host
	// resolution completes. It's called with the next result after host
	// resolution, not the result of host resolution itself.
	void OnQuicHostResolution(int result);

	// Invoked when the underlying connection fails on the default network.
	void OnFailedOnDefaultNetwork(int result);

	// Each of these methods corresponds to a State value. Those with an input
	// argument receive the result from the previous state. If a method returns
	// ERR_IO_PENDING, then the result from OnIOComplete will be passed to the
	// next state method as the result arg.
	int DoStart();
	int DoWait();
	int DoWaitComplete(int result);
	int DoEvaluateThrottle();
	int DoInitConnection();
	int DoInitConnectionComplete(int result);
	int DoWaitingUserAction(int result);
	int DoCreateStream();
	int DoCreateStreamComplete(int result);

	void ResumeInitConnection();
	// Creates a SpdyHttpStream or a BidirectionalStreamImpl from the given values
	// and sets to \|stream_\| or \|bidirectional_stream_impl_\| respectively. Does
	// nothing if \|stream_factory_\| is for WebSocket.
	int SetSpdyHttpStreamOrBidirectionalStreamImpl(
	base::WeakPtr<SpdySession> session);

	// Returns to STATE_INIT_CONNECTION and resets some state.
	void ReturnToStateInitConnection(bool close_connection);

	// Sets several fields of \|ssl_config\| based on the proxy info and other
	// factors.
	void InitSSLConfig(SSLConfig* ssl_config, bool is_proxy) const;

	// Retrieve SSLInfo from our SSL Socket.
	// This must only be called when we are using an SSLSocket.
	void GetSSLInfo(SSLInfo* ssl_info);

	// Called in Job constructor: should Job be forced to use QUIC.
	static bool ShouldForceQuic(HttpNetworkSession* session,
	const HostPortPair& destination,
	const GURL& origin_url,
	const ProxyInfo& proxy_info);

	// Called in Job constructor. Use \|spdy_session_key_\| after construction.
	static SpdySessionKey GetSpdySessionKey(bool spdy_session_direct,
	const ProxyServer& proxy_server,
	const GURL& origin_url,
	PrivacyMode privacy_mode,
	const SocketTag& socket_tag);

	// Returns true if the current request can use an existing spdy session.
	bool CanUseExistingSpdySession() const;

	// Called when we encounter a network error that could be resolved by trying
	// a new proxy configuration. If there is another proxy configuration to try
	// then this method sets next_state_ appropriately and returns either OK or
	// ERR_IO_PENDING depending on whether or not the new proxy configuration is
	// available synchronously or asynchronously. Otherwise, the given error
	// code is simply returned.
	int ReconsiderProxyAfterError(int error);

	// Called to handle a certificate error. Stores the certificate in the
	// allowed_bad_certs list. Returns the error code.
	int HandleCertificateError(int error);

	// Called to handle a client certificate request.
	int HandleCertificateRequest(int error);

	ClientSocketPoolManager::SocketGroupType GetSocketGroup() const;

	void MaybeCopyConnectionAttemptsFromSocketOrHandle();

	// Record histograms of latency until Connect() completes.
	static void LogHttpConnectedMetrics(const ClientSocketHandle& handle);

	// Invoked by the transport socket pool after host resolution is complete
	// to allow the connection to be aborted, if a matching SPDY session can
	// be found. Will return ERR_SPDY_SESSION_ALREADY_EXISTS if such a
	// session is found, and OK otherwise.
	static int OnHostResolution(SpdySessionPool* spdy_session_pool,
	const SpdySessionKey& spdy_session_key,
	bool enable_ip_based_pooling,
	bool is_websocket,
	const AddressList& addresses,
	const NetLogWithSource& net_log);

	const HttpRequestInfo request_info_;
	RequestPriority priority_;
	const ProxyInfo proxy_info_;
	SSLConfig server_ssl_config_;
	SSLConfig proxy_ssl_config_;
	const NetLogWithSource net_log_;

	const CompletionRepeatingCallback io_callback_;
	std::unique_ptr<ClientSocketHandle> connection_;
	HttpNetworkSession* const session_;

	State next_state_;

	// The server we are trying to reach, could be that of the origin or of the
	// alternative service (after applying host mapping rules).
	const HostPortPair destination_;

	// The origin url we're trying to reach. This url may be different from the
	// original request when host mapping rules are set-up.
	const GURL origin_url_;

	// Alternative proxy server that should be used by \|this\| to fetch the
	// request.
	const ProxyServer alternative_proxy_server_;

	// True if request is for Websocket.
	const bool is_websocket_;

	// True if WebSocket request is allowed to use a WebSocket-capable existing
	// HTTP/2 connection. In this case FindAvailableSession() must be called with
	// \|enable_websocket = true\|.
	const bool try_websocket_over_http2_;

	// Enable pooling to a SpdySession with matching IP and certificate
	// even if the SpdySessionKey is different.
	const bool enable_ip_based_pooling_;

	// Unowned. \|this\| job is owned by \|delegate_\|.
	Delegate* const delegate_;

	const JobType job_type_;

	// True if handling a HTTPS request.
	const bool using_ssl_;

	// True if Job uses QUIC.
	const bool using_quic_;

	// quic::QuicTransportVersion that should be used to connect to the QUIC
	// server if Job uses QUIC.
	quic::QuicTransportVersion quic_version_;

	// True if Alternative Service protocol field requires that HTTP/2 is used.
	// In this case, Job fails if it cannot pool to an existing SpdySession and
	// the server does not negotiate HTTP/2 on a new socket.
	const bool expect_spdy_;

	// True if Job actually uses HTTP/2.
	bool using_spdy_;

	// True if this job might succeed with a different proxy config.
	bool should_reconsider_proxy_;

	QuicStreamRequest quic_request_;

	// Only valid for a QUIC job. Set when a QUIC connection is started. If true,
	// then OnQuicHostResolution() is expected to be called in the future.
	bool expect_on_quic_host_resolution_;

	// True if this job used an existing QUIC session.
	bool using_existing_quic_session_;

	// True when the tunnel is in the process of being established - we can't
	// read from the socket until the tunnel is done.
	bool establishing_tunnel_;

	std::unique_ptr<HttpStream> stream_;
	std::unique_ptr<WebSocketHandshakeStreamBase> websocket_stream_;
	std::unique_ptr<BidirectionalStreamImpl> bidirectional_stream_impl_;

	// True if we negotiated ALPN.
	bool was_alpn_negotiated_;

	// Protocol negotiated with the server.
	NextProto negotiated_protocol_;

	// 0 if we're not preconnecting. Otherwise, the number of streams to
	// preconnect.
	int num_streams_;

	// Initialized when we create a new SpdySession.
	base::WeakPtr<SpdySession> new_spdy_session_;

	// Initialized when we have an existing SpdySession.
	base::WeakPtr<SpdySession> existing_spdy_session_;

	// Once Job claims a pushed stream on a SpdySession, \|pushed_stream_id_\| is
	// the ID of the claimed stream, and \|existing_spdy_session_\| points to that
	// SpdySession. Otherwise \|pushed_stream_id_\| is set to kNoPushedStreamFound
	// (but \|existing_spdy_session_\| can still be non-null).
	spdy::SpdyStreamId pushed_stream_id_;

	// True if not connecting to an Https proxy for an Http url.
	const bool spdy_session_direct_;

	const SpdySessionKey spdy_session_key_;

	// Type of stream that is requested.
	HttpStreamRequest::StreamType stream_type_;

	// Whether Job has continued to DoInitConnection().
	bool init_connection_already_resumed_;

	base::OnceClosure restart_with_auth_callback_;

	NetErrorDetails net_error_details_;

	base::WeakPtrFactory<Job> ptr_factory_;

	DISALLOW_COPY_AND_ASSIGN(Job);
	};

	// Factory for creating Jobs.
	class HttpStreamFactory::JobFactory {
	public:
	JobFactory();

	virtual ~JobFactory();

	virtual std::unique_ptr<HttpStreamFactory::Job> CreateMainJob(
	HttpStreamFactory::Job::Delegate* delegate,
	HttpStreamFactory::JobType job_type,
	HttpNetworkSession* session,
	const HttpRequestInfo& request_info,
	RequestPriority priority,
	const ProxyInfo& proxy_info,
	const SSLConfig& server_ssl_config,
	const SSLConfig& proxy_ssl_config,
	HostPortPair destination,
	GURL origin_url,
	bool is_websocket,
	bool enable_ip_based_pooling,
	NetLog* net_log);

	virtual std::unique_ptr<HttpStreamFactory::Job> CreateAltSvcJob(
	HttpStreamFactory::Job::Delegate* delegate,
	HttpStreamFactory::JobType job_type,
	HttpNetworkSession* session,
	const HttpRequestInfo& request_info,
	RequestPriority priority,
	const ProxyInfo& proxy_info,
	const SSLConfig& server_ssl_config,
	const SSLConfig& proxy_ssl_config,
	HostPortPair destination,
	GURL origin_url,
	NextProto alternative_protocol,
	quic::QuicTransportVersion quic_version,
	bool is_websocket,
	bool enable_ip_based_pooling,
	NetLog* net_log);

	virtual std::unique_ptr<HttpStreamFactory::Job> CreateAltProxyJob(
	HttpStreamFactory::Job::Delegate* delegate,
	HttpStreamFactory::JobType job_type,
	HttpNetworkSession* session,
	const HttpRequestInfo& request_info,
	RequestPriority priority,
	const ProxyInfo& proxy_info,
	const SSLConfig& server_ssl_config,
	const SSLConfig& proxy_ssl_config,
	HostPortPair destination,
	GURL origin_url,
	const ProxyServer& alternative_proxy_server,
	bool is_websocket,
	bool enable_ip_based_pooling,
	NetLog* net_log);
	};

	} // namespace net

	#endif // NET_HTTP_HTTP_STREAM_FACTORY_JOB_H_