Fix handling of HTTP/S keep-alives (RIPD-556):

* Proper shutdown for ssl and non-ssl connections
* Report session id in history
* Report histogram of requests per session
* Change print name to 'http'
* Split logging into "HTTP" and "HTTP-RPC" partitions
* More logging and refinement of logging severities
* Log the request count when a session is destroyed

Author: vinniefalco

src/ripple/http/Session.h

@@ -147,6 +147,15 @@ class Session
     }
     /** @} */
 
+    /** Detach the session.
+        This holds the session open so that the response can be sent
+        asynchronously. Calls to io_service::run made by the server
+        will not return until all detached sessions are closed.
+    */
+    virtual
+    void
+    detach() = 0;
+
     /** Indicate that the response is complete.
         The handler should call this when it has completed writing
         the response. If Keep-Alive is indicated on the connection,
@@ -157,15 +166,6 @@ class Session
     void
     complete() = 0;
 
-    /** Detach the session.
-        This holds the session open so that the response can be sent
-        asynchronously. Calls to io_service::run made by the server
-        will not return until all detached sessions are closed.
-    */
-    virtual
-    void
-    detach() = 0;
-
     /** Close the session.
         This will be performed asynchronously. The session will be
         closed gracefully after all pending writes have completed.

src/ripple/http/impl/Door.cpp

@@ -81,7 +81,7 @@ void
 Door::async_accept ()
 {
     auto const peer (std::make_shared <Peer> (server_, port_, server_.journal()));
-    acceptor_.async_accept (peer->get_socket(), std::bind (
+    acceptor_.async_accept (peer->get_socket(), endpoint_, std::bind (
         &Door::handle_accept, Ptr(this),
             beast::asio::placeholders::error, peer));
 }
@@ -95,13 +95,14 @@ Door::handle_accept (error_code ec,
 
     if (ec)
     {
-        server_.journal().error << "Accept failed: " << ec.message();
+        server_.journal().error <<
+            "accept: " << ec.message();
         return;
     }
 
+    auto const endpoint = endpoint_;
     async_accept();
-
-    peer->accept();
+    peer->accept (endpoint);
 }
 
 }

src/ripple/http/impl/Door.h

@@ -39,6 +39,7 @@ class Door
 
     ServerImpl& server_;
     acceptor acceptor_;
+    endpoint_t endpoint_;
     Port port_;
 
 public: