SSL Connect Job Waiting

net/socket/ssl_client_socket_pool.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_SOCKET_SSL_CLIENT_SOCKET_POOL_H_
 #define NET_SOCKET_SSL_CLIENT_SOCKET_POOL_H_
 
+#include <map>
 #include <string>
+#include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "net/base/privacy_mode.h"
 #include "net/dns/host_resolver.h"
 #include "net/http/http_response_info.h"
 #include "net/socket/client_socket_pool.h"
 #include "net/socket/client_socket_pool_base.h"
 #include "net/socket/client_socket_pool_histograms.h"
@@ skipping 72 matching lines @@
   const bool want_spdy_over_npn_;
   bool ignore_limits_;
 
   DISALLOW_COPY_AND_ASSIGN(SSLSocketParams);
 };
 
 // SSLConnectJob handles the SSL handshake after setting up the underlying
 // connection as specified in the params.
 class SSLConnectJob : public ConnectJob {
  public:
-  SSLConnectJob(
-      const std::string& group_name,
-      RequestPriority priority,
-      const scoped_refptr<SSLSocketParams>& params,
-      const base::TimeDelta& timeout_duration,
-      TransportClientSocketPool* transport_pool,
-      SOCKSClientSocketPool* socks_pool,
-      HttpProxyClientSocketPool* http_proxy_pool,
-      ClientSocketFactory* client_socket_factory,
-      HostResolver* host_resolver,
-      const SSLClientSocketContext& context,
-      Delegate* delegate,
-      NetLog* net_log);
+  // List of SSLConnectJobs that are either in the process of connecting
+  // to or waiting to connect to the same server.
+  typedef std::vector<SSLConnectJob*> PendingJobList;
+
+  SSLConnectJob(const std::string& group_name,

[wtc, 2014/06/26 17:48:17]

Please move the comment here:

  // Note: the SSLConnectJob does not own pending_jobs_list
  // so it must outlive the job.

+                RequestPriority priority,
+                const scoped_refptr<SSLSocketParams>& params,
+                const base::TimeDelta& timeout_duration,
+                TransportClientSocketPool* transport_pool,
+                SOCKSClientSocketPool* socks_pool,
+                HttpProxyClientSocketPool* http_proxy_pool,
+                ClientSocketFactory* client_socket_factory,
+                HostResolver* host_resolver,
+                const SSLClientSocketContext& context,
+                PendingJobList* pending_jobs_list,
+                Delegate* delegate,
+                NetLog* net_log);
   virtual ~SSLConnectJob();
 
   // ConnectJob methods.
   virtual LoadState GetLoadState() const OVERRIDE;
 
   virtual void GetAdditionalErrorState(ClientSocketHandle * handle) OVERRIDE;
 
+  // Enables or disables SSLConnectJob waiting.
+  // If enabled, simultaneous attempts to connect to the same server
+  // will be serialized until an SSL session is cached, allowing those
+  // handshakes to perform a resumption handshake.
+  static NET_EXPORT void EnableJobWaiting(bool enable);
+
+  static bool GetEnableJobWaiting();

[wtc, 2014/06/26 17:48:17]

Nit: this function can be named "JobWaitingEnabled" or "JobWaitingIsEnabled".

One naming convention for getter and setter methods is GetFoo() and SetFoo().
Since the setter method EnableJobWaiting doesn't follow this convention, it is
confusing for the getter method to be named this way.

+
  private:
   enum State {
     STATE_TRANSPORT_CONNECT,
     STATE_TRANSPORT_CONNECT_COMPLETE,
     STATE_SOCKS_CONNECT,
     STATE_SOCKS_CONNECT_COMPLETE,
     STATE_TUNNEL_CONNECT,
     STATE_TUNNEL_CONNECT_COMPLETE,
+    STATE_CREATE_SSL_SOCKET,
+    STATE_CHECK_FOR_RESUME,
     STATE_SSL_CONNECT,
     STATE_SSL_CONNECT_COMPLETE,
+    STATE_PROCESS_PENDING_JOBS,
     STATE_NONE,
   };
 
   void OnIOComplete(int result);
 
   // Runs the state transition loop.
   int DoLoop(int result);
 
   int DoTransportConnect();
   int DoTransportConnectComplete(int result);
   int DoSOCKSConnect();
   int DoSOCKSConnectComplete(int result);
   int DoTunnelConnect();
   int DoTunnelConnectComplete(int result);
+  int DoCreateSSLSocket();
+  int DoCheckForResume();
   int DoSSLConnect();
   int DoSSLConnectComplete(int result);
+  int DoProcessPendingJobs(int result);
+
+  // Decides how pending jobs should continue their connection
+  // based upon the success or failure of the leading job.
+  void ProcessPendingJobs(int result);
+
+  // Tells a waiting SSLConnectJob to resume its SSL connection.
+  void ResumeSSLConnection();
 
   // Returns the initial state for the state machine based on the
   // |connection_type|.
   static State GetInitialState(SSLSocketParams::ConnectionType connection_type);
 
   // Starts the SSL connection process.  Returns OK on success and
   // ERR_IO_PENDING if it cannot immediately service the request.
   // Otherwise, it returns a net error code.
   virtual int ConnectInternal() OVERRIDE;
 
+  static bool enable_job_waiting_;
   scoped_refptr<SSLSocketParams> params_;
   TransportClientSocketPool* const transport_pool_;
   SOCKSClientSocketPool* const socks_pool_;
   HttpProxyClientSocketPool* const http_proxy_pool_;
   ClientSocketFactory* const client_socket_factory_;
   HostResolver* const host_resolver_;
 
   const SSLClientSocketContext context_;
 
   State next_state_;
-  CompletionCallback callback_;
+  CompletionCallback io_callback_;
   scoped_ptr<ClientSocketHandle> transport_socket_handle_;
   scoped_ptr<SSLClientSocket> ssl_socket_;
 
+  // TODO(mshelley) ensure that these pointers are deleted.
+  PendingJobList* pending_jobs_;
   HttpResponseInfo error_response_info_;
 
   DISALLOW_COPY_AND_ASSIGN(SSLConnectJob);
 };
 
 class NET_EXPORT_PRIVATE SSLClientSocketPool
     : public ClientSocketPool,
       public HigherLayeredPool,
       public SSLConfigService::Observer {
  public:
@@ skipping 96 matching lines @@
 
     // ClientSocketPoolBase::ConnectJobFactory methods.
     virtual scoped_ptr<ConnectJob> NewConnectJob(
         const std::string& group_name,
         const PoolBase::Request& request,
         ConnectJob::Delegate* delegate) const OVERRIDE;
 
     virtual base::TimeDelta ConnectionTimeout() const OVERRIDE;
 
    private:
+    // Maps SSLConnectJob group names to lists of pending connect jobs to
+    // that group name.
+    typedef std::map<std::string, SSLConnectJob::PendingJobList*> PendingJobMap;
+
     TransportClientSocketPool* const transport_pool_;
     SOCKSClientSocketPool* const socks_pool_;
     HttpProxyClientSocketPool* const http_proxy_pool_;
     ClientSocketFactory* const client_socket_factory_;
     HostResolver* const host_resolver_;
     const SSLClientSocketContext context_;
     base::TimeDelta timeout_;
     NetLog* net_log_;
+    scoped_ptr<PendingJobMap> pending_jobs_map_;

[wtc, 2014/06/26 17:48:17]

Please declare this member as a non-pointer, if that works:

  PendingJobMap pending_jobs_map_;

This will save a memory allocation from the heap.

 
     DISALLOW_COPY_AND_ASSIGN(SSLConnectJobFactory);
   };
 
   TransportClientSocketPool* const transport_pool_;
   SOCKSClientSocketPool* const socks_pool_;
   HttpProxyClientSocketPool* const http_proxy_pool_;
   PoolBase base_;
   const scoped_refptr<SSLConfigService> ssl_config_service_;
 
   DISALLOW_COPY_AND_ASSIGN(SSLClientSocketPool);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_SSL_CLIENT_SOCKET_POOL_H_