Add timeouts for ConnectJobs. Limit ConnectJobs per group to number of Requests per group + 1.

In the histograms for Net.SocketRequestTime, late binding has a much longer tail.  This is presumably because I didn't implement timeouts and CancelRequest() never cancelled jobs.  I'm limiting TCPConnectJobs to 30 seconds and cancelling jobs if there are too many more than there are requests.

Review URL: http://codereview.chromium.org/160499

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@22326 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 16 insertions, 3 deletions

diff --git a/net/socket/client_socket_pool_base.h b/net/socket/client_socket_pool_base.h
index 21cd642..51b2139 100644
--- a/net/socket/client_socket_pool_base.h
+++ b/net/socket/client_socket_pool_base.h
@@ -43,8 +43,10 @@ class ConnectJob {
     DISALLOW_COPY_AND_ASSIGN(Delegate);
   };
 
+  // A |timeout_duration| of 0 corresponds to no timeout.
   ConnectJob(const std::string& group_name,
              const ClientSocketHandle* key_handle,
+             base::TimeDelta timeout_duration,
              Delegate* delegate);
   virtual ~ConnectJob();
 
@@ -63,7 +65,7 @@ class ConnectJob {
   // |delegate_| via OnConnectJobComplete.  In both asynchronous and synchronous
   // completion, ReleaseSocket() can be called to acquire the connected socket
   // if it succeeded.
-  virtual int Connect() = 0;
+  int Connect();
 
  protected:
   void set_load_state(LoadState load_state) { load_state_ = load_state; }
@@ -72,10 +74,18 @@ class ConnectJob {
   Delegate* delegate() { return delegate_; }
 
  private:
+  virtual int ConnectInternal() = 0;
+
+  // Alerts the delegate that the ConnectJob has timed out.
+  void OnTimeout();
+
   const std::string group_name_;
   // Temporarily needed until we switch to late binding.
   const ClientSocketHandle* const key_handle_;
-  Delegate* const delegate_;
+  const base::TimeDelta timeout_duration_;
+  // Timer to abort jobs that take too long.
+  base::OneShotTimer<ConnectJob> timer_;
+  Delegate* delegate_;
   LoadState load_state_;
   scoped_ptr<ClientSocket> socket_;
 
@@ -168,6 +178,9 @@ class ClientSocketPoolBase
 
   // For testing.
   bool may_have_stalled_group() const { return may_have_stalled_group_; }
+  int NumConnectJobsInGroup(const std::string& group_name) const {
+    return group_map_.find(group_name)->second.jobs.size();
+  }
 
  private:
   // Entry for a persistent socket which became idle at time |start_time|.
@@ -252,7 +265,7 @@ class ClientSocketPoolBase
   // binding is enabled.  |job| must be non-NULL when late binding is
   // enabled.  Also updates |group| if non-NULL.
   void RemoveConnectJob(const ClientSocketHandle* handle,
-                        ConnectJob* job,
+                        const ConnectJob* job,
                         Group* group);
 
   // Same as OnAvailableSocketSlot except it looks up the Group first to see if