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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 
00027                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
00028 
00029 
00030         @version        Initial version, April 2004      
00031         @author         Kris
00032 
00033 
00034 *******************************************************************************/
00035 
00036 module mango.http.server.HttpBridge;
00037 
00038 private import  mango.io.Socket;
00039 
00040 private import  mango.io.model.IConduit;
00041 
00042 private import  mango.utils.model.IServer;
00043 
00044 private import  mango.http.server.HttpThread,
00045                 mango.http.server.HttpServer,
00046                 mango.http.server.HttpRequest,
00047                 mango.http.server.HttpResponse;
00048 
00049 private import  mango.http.server.model.IProvider,
00050                 mango.http.server.model.IProviderBridge;
00051 
00052 /******************************************************************************
00053 
00054         Bridges between an IProvider and an IServer, and contains a set of
00055         data specific to each thread. There is only one instance of server
00056         and provider, but multiple live instances of HttpBridge (one per 
00057         server-thread).
00058 
00059         Any additional thread-specific data should probably be contained
00060         within this class, since it is reachable from almost everywhere.
00061 
00062 ******************************************************************************/
00063 
00064 class HttpBridge : IProviderBridge
00065 {
00066         private IServer         server;
00067         private IProvider       provider;
00068 
00069         private HttpThread      thread;
00070         private HttpRequest     request;
00071         private HttpResponse    response;
00072         
00073         /**********************************************************************
00074 
00075                 Construct a bridge with the requisite attributes. We create
00076                 the per-thread request/response pair here, and maintain them 
00077                 for the lifetime of the server.
00078 
00079         **********************************************************************/
00080 
00081         this (IServer server, IProvider provider, HttpThread thread)
00082         {
00083                 this.thread = thread;
00084                 this.server = server;
00085                 this.provider = provider;
00086 
00087                 request = provider.createRequest(this);
00088                 response = provider.createResponse(this);
00089         }
00090 
00091         /**********************************************************************
00092 
00093                 Return the server from one side of this bridge
00094 
00095         **********************************************************************/
00096 
00097         IServer getServer()
00098         {
00099                 return server;
00100         }
00101 
00102         /**********************************************************************
00103 
00104                 Return the provider from the other side of the bridge
00105 
00106         **********************************************************************/
00107 
00108         IProvider getProvider()
00109         {
00110                 return provider;
00111         }
00112 
00113         /**********************************************************************
00114 
00115                 Bridge the divide between IServer and IProvider instances.
00116                 Note that there is one instance of this class per thread.
00117 
00118                 Note also that this is probably the right place to implement 
00119                 keep-alive support if that were ever to happen, although the
00120                 implementation should itself be in a subclass.
00121 
00122         **********************************************************************/
00123 
00124         void cross (IConduit conduit)
00125         {
00126                 // bind our input & output instance to this conduit
00127                 request.setConduit (conduit);
00128                 response.setConduit (conduit);
00129 
00130                 try {
00131                     // reset the (probably overridden) input and output
00132                     request.reset();
00133                     response.reset();
00134 
00135                     // first, extract HTTP headers from input
00136                     request.readHeaders ();
00137 
00138                     // pass request off to the provider. It is the provider's 
00139                     // responsibility to flush the output!
00140                     provider.service (request, response);
00141                     } finally {
00142                               // close and destroy this conduit (socket)
00143                               conduit.close();
00144                               }
00145         }
00146 }

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