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HttpBridge.d

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00001 /*******************************************************************************
00002 
00003         @file HttpBridge.d
00004         
00005         Copyright (c) 2004 Kris Bell
00006         
00007         This software is provided 'as-is', without any express or implied
00008         warranty. In no event will the authors be held liable for damages
00009         of any kind arising from the use of this software.
00010         
00011         Permission is hereby granted to anyone to use this software for any 
00012         purpose, including commercial applications, and to alter it and/or 
00013         redistribute it freely, subject to the following restrictions:
00014         
00015         1. The origin of this software must not be misrepresented; you must 
00016            not claim that you wrote the original software. If you use this 
00017            software in a product, an acknowledgment within documentation of 
00018            said product would be appreciated but is not required.
00019 
00020         2. Altered source versions must be plainly marked as such, and must 
00021            not be misrepresented as being the original software.
00022 
00023         3. This notice may not be removed or altered from any distribution
00024            of the source.
00025 
00026         4. Derivative works are permitted, but they must carry this notice
00027            in full and credit the original source.
00028 
00029 
00030                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
00031 
00032 
00033         @version        Initial version, April 2004      
00034         @author         Kris
00035 
00036 
00037 *******************************************************************************/
00038 
00039 module mango.http.server.HttpBridge;
00040 
00041 private import  mango.io.Socket;
00042 
00043 private import  mango.io.model.IConduit;
00044 
00045 private import  mango.utils.model.IServer;
00046 
00047 private import  mango.http.server.HttpThread,
00048                 mango.http.server.HttpServer,
00049                 mango.http.server.HttpRequest,
00050                 mango.http.server.HttpResponse;
00051 
00052 private import  mango.http.server.model.IProvider,
00053                 mango.http.server.model.IProviderBridge;
00054 
00055 /******************************************************************************
00056 
00057         Bridges between an IProvider and an IServer, and contains a set of
00058         data specific to each thread. There is only one instance of server
00059         and provider, but multiple live instances of HttpBridge (one per 
00060         server-thread).
00061 
00062         Any additional thread-specific data should probably be contained
00063         within this class, since it is reachable from almost everywhere.
00064 
00065 ******************************************************************************/
00066 
00067 class HttpBridge : IProviderBridge
00068 {
00069         private IServer         server;
00070         private IProvider       provider;
00071 
00072         private HttpThread      thread;
00073         private HttpRequest     request;
00074         private HttpResponse    response;
00075         
00076         /**********************************************************************
00077 
00078                 Construct a bridge with the requisite attributes. We create
00079                 the per-thread request/response pair here, and maintain them 
00080                 for the lifetime of the server.
00081 
00082         **********************************************************************/
00083 
00084         this (IServer server, IProvider provider, HttpThread thread)
00085         {
00086                 this.thread = thread;
00087                 this.server = server;
00088                 this.provider = provider;
00089 
00090                 request = provider.createRequest(this);
00091                 response = provider.createResponse(this);
00092         }
00093 
00094         /**********************************************************************
00095 
00096                 Return the server from one side of this bridge
00097 
00098         **********************************************************************/
00099 
00100         IServer getServer()
00101         {
00102                 return server;
00103         }
00104 
00105         /**********************************************************************
00106 
00107                 Return the provider from the other side of the bridge
00108 
00109         **********************************************************************/
00110 
00111         IProvider getProvider()
00112         {
00113                 return provider;
00114         }
00115 
00116         /**********************************************************************
00117 
00118                 Bridge the divide between IServer and IProvider instances.
00119                 Note that there is one instance of this class per thread.
00120 
00121                 Note also that this is probably the right place to implement 
00122                 keep-alive support if that were ever to happen, although the
00123                 implementation should itself be in a subclass.
00124 
00125         **********************************************************************/
00126 
00127         void cross (IConduit conduit)
00128         {
00129                 // bind our input & output instance to this conduit
00130                 request.setConduit (conduit);
00131                 response.setConduit (conduit);
00132 
00133                 try {
00134                     // reset the (probably overridden) input and output
00135                     request.reset();
00136                     response.reset();
00137 
00138                     // first, extract HTTP headers from input
00139                     request.readHeaders ();
00140 
00141                     // pass request off to the provider. It is the provider's 
00142                     // responsibility to flush the output!
00143                     provider.service (request, response);
00144                     } finally {
00145                               // close and destroy this conduit (socket)
00146                               conduit.close();
00147                               }
00148         }
00149 }

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