llsdrpcserver.h
上传用户:king477883
上传日期:2021-03-01
资源大小:9553k
文件大小:10k
- /**
- * @file llsdrpcserver.h
- * @author Phoenix
- * @date 2005-10-11
- * @brief Declaration of the structured data remote procedure call server.
- *
- * $LicenseInfo:firstyear=2005&license=viewergpl$
- *
- * Copyright (c) 2005-2010, Linden Research, Inc.
- *
- * Second Life Viewer Source Code
- * The source code in this file ("Source Code") is provided by Linden Lab
- * to you under the terms of the GNU General Public License, version 2.0
- * ("GPL"), unless you have obtained a separate licensing agreement
- * ("Other License"), formally executed by you and Linden Lab. Terms of
- * the GPL can be found in doc/GPL-license.txt in this distribution, or
- * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
- *
- * There are special exceptions to the terms and conditions of the GPL as
- * it is applied to this Source Code. View the full text of the exception
- * in the file doc/FLOSS-exception.txt in this software distribution, or
- * online at
- * http://secondlifegrid.net/programs/open_source/licensing/flossexception
- *
- * By copying, modifying or distributing this software, you acknowledge
- * that you have read and understood your obligations described above,
- * and agree to abide by those obligations.
- *
- * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
- * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
- * COMPLETENESS OR PERFORMANCE.
- * $/LicenseInfo$
- */
- #ifndef LL_LLSDRPCSERVER_H
- #define LL_LLSDRPCSERVER_H
- /**
- * I've set this up to be pretty easy to use when you want to make a
- * structured data rpc server which responds to methods by
- * name. Derive a class from the LLSDRPCServer, and during
- * construction (or initialization if you have the luxury) map method
- * names to pointers to member functions. This will look a lot like:
- *
- * <code>
- * class LLMessageAgents : public LLSDRPCServer {<br>
- * public:<br>
- * typedef LLSDRPCServer<LLUsher> mem_fn_t;<br>
- * LLMessageAgents() {<br>
- * mMethods["message"] = new mem_fn_t(this, &LLMessageAgents::rpc_IM);<br>
- * mMethods["alert"] = new mem_fn_t(this, &LLMessageAgents::rpc_Alrt);<br>
- * }<br>
- * protected:<br>
- * rpc_IM(const LLSD& params,
- * const LLChannelDescriptors& channels,
- * LLBufferArray* data)
- * {...}<br>
- * rpc_Alert(const LLSD& params,
- * const LLChannelDescriptors& channels,
- * LLBufferArray* data)
- * {...}<br>
- * };<br>
- * </code>
- *
- * The params are an array where each element in the array is a single
- * parameter in the call.
- *
- * It is up to you to pack a valid serialized llsd response into the
- * data object passed into the method, but you can use the helper
- * methods below to help.
- */
- #include <map>
- #include "lliopipe.h"
- #include "lliohttpserver.h"
- #include "llfiltersd2xmlrpc.h"
- class LLSD;
- /**
- * @brief Enumeration for specifying server method call status. This
- * enumeration controls how the server class will manage the pump
- * process/callback mechanism.
- */
- enum ESDRPCSStatus
- {
- // The call went ok, but the response is not yet ready. The
- // method will arrange for the clearLock() call to be made at
- // a later date, after which, once the chain is being pumped
- // again, deferredResponse() will be called to gather the result
- ESDRPCS_DEFERRED,
- // The LLSDRPCServer would like to handle the method on the
- // callback queue of the pump.
- ESDRPCS_CALLBACK,
- // The method call finished and generated output.
- ESDRPCS_DONE,
- // Method failed for some unspecified reason - you should avoid
- // this. A generic fault will be sent to the output.
- ESDRPCS_ERROR,
- ESDRPCS_COUNT,
- };
- /**
- * @class LLSDRPCMethodCallBase
- * @brief Base class for calling a member function in an sd rpcserver
- * implementation.
- */
- class LLSDRPCMethodCallBase
- {
- public:
- LLSDRPCMethodCallBase() {}
- virtual ~LLSDRPCMethodCallBase() {}
- virtual ESDRPCSStatus call(
- const LLSD& params,
- const LLChannelDescriptors& channels,
- LLBufferArray* response) = 0;
- protected:
- };
- /**
- * @class LLSDRPCMethodCall
- * @brief Class which implements member function calls.
- */
- template<class Server>
- class LLSDRPCMethodCall : public LLSDRPCMethodCallBase
- {
- public:
- typedef ESDRPCSStatus (Server::*mem_fn)(
- const LLSD& params,
- const LLChannelDescriptors& channels,
- LLBufferArray* data);
- LLSDRPCMethodCall(Server* s, mem_fn fn) :
- mServer(s),
- mMemFn(fn)
- {
- }
- virtual ~LLSDRPCMethodCall() {}
- virtual ESDRPCSStatus call(
- const LLSD& params,
- const LLChannelDescriptors& channels,
- LLBufferArray* data)
- {
- return (*mServer.*mMemFn)(params, channels, data);
- }
- protected:
- Server* mServer;
- mem_fn mMemFn;
- //bool (Server::*mMemFn)(const LLSD& params, LLBufferArray& data);
- };
- /**
- * @class LLSDRPCServer
- * @brief Basic implementation of a structure data rpc server
- *
- * The rpc server is also designed to appropriately straddle the pump
- * <code>process()</code> and <code>callback()</code> to specify which
- * thread you want to work on when handling a method call. The
- * <code>mMethods</code> methods are called from
- * <code>process()</code>, while the <code>mCallbackMethods</code> are
- * called when a pump is in a <code>callback()</code> cycle.
- */
- class LLSDRPCServer : public LLIOPipe
- {
- public:
- LLSDRPCServer();
- virtual ~LLSDRPCServer();
- /**
- * enumeration for generic fault codes
- */
- enum
- {
- FAULT_BAD_REQUEST = 2000,
- FAULT_NO_RESPONSE = 2001,
- };
- /**
- * @brief Call this method to return an rpc fault.
- *
- * @param channel The channel for output on the data buffer
- * @param data buffer which will recieve the final output
- * @param code The fault code
- * @param msg The fault message
- */
- static void buildFault(
- const LLChannelDescriptors& channels,
- LLBufferArray* data,
- S32 code,
- const std::string& msg);
- /**
- * @brief Call this method to build an rpc response.
- *
- * @param channel The channel for output on the data buffer
- * @param data buffer which will recieve the final output
- * @param response The return value from the method call
- */
- static void buildResponse(
- const LLChannelDescriptors& channels,
- LLBufferArray* data,
- const LLSD& response);
- protected:
- /* @name LLIOPipe virtual implementations
- */
- //@{
- /**
- * @brief Process the data in buffer
- */
- virtual EStatus process_impl(
- const LLChannelDescriptors& channels,
- buffer_ptr_t& buffer,
- bool& eos,
- LLSD& context,
- LLPumpIO* pump);
- //@}
- protected:
- /**
- * @brief Enumeration to track the state of the rpc server instance
- */
- enum EState
- {
- STATE_NONE,
- STATE_CALLBACK,
- STATE_DEFERRED,
- STATE_DONE
- };
- /**
- * @brief This method is called when an http post comes in.
- *
- * The default behavior is to look at the method name, look up the
- * method in the method table, and call it. If the method is not
- * found, this function will build a fault response. You can
- * implement your own version of this function if you want to hard
- * wire some behavior or optimize things a bit.
- * @param method The method name being called
- * @param params The parameters
- * @param channel The channel for output on the data buffer
- * @param data The http data
- * @return Returns the status of the method call, done/deferred/etc
- */
- virtual ESDRPCSStatus callMethod(
- const std::string& method,
- const LLSD& params,
- const LLChannelDescriptors& channels,
- LLBufferArray* data);
- /**
- * @brief This method is called when a pump callback is processed.
- *
- * The default behavior is to look at the method name, look up the
- * method in the callback method table, and call it. If the method
- * is not found, this function will build a fault response. You
- * can implement your own version of this function if you want to
- * hard wire some behavior or optimize things a bit.
- * @param method The method name being called
- * @param params The parameters
- * @param channel The channel for output on the data buffer
- * @param data The http data
- * @return Returns the status of the method call, done/deferred/etc
- */
- virtual ESDRPCSStatus callbackMethod(
- const std::string& method,
- const LLSD& params,
- const LLChannelDescriptors& channels,
- LLBufferArray* data);
- /**
- * @brief Called after a deferred service is unlocked
- *
- * If a method returns ESDRPCS_DEFERRED, then the service chain
- * will be locked and not processed until some other system calls
- * clearLock() on the service instance again. At that point,
- * once the pump starts processing the chain again, this method
- * will be called so the service can output the final result
- * into the buffers.
- */
- virtual ESDRPCSStatus deferredResponse(
- const LLChannelDescriptors& channels,
- LLBufferArray* data);
- // donovan put this public here 7/27/06
- public:
- /**
- * @brief unlock a service that as ESDRPCS_DEFERRED
- */
- void clearLock();
- protected:
- EState mState;
- LLSD mRequest;
- LLPumpIO* mPump;
- S32 mLock;
- typedef std::map<std::string, LLSDRPCMethodCallBase*> method_map_t;
- method_map_t mMethods;
- method_map_t mCallbackMethods;
- };
- /**
- * @name Helper Templates for making LLHTTPNodes
- *
- * These templates help in creating nodes for handing a service from
- * either SDRPC or XMLRPC, given a single implementation of LLSDRPCServer.
- *
- * To use it:
- * code
- * class LLUsefulServer : public LLSDRPCServer { ... }
- *
- * LLHTTPNode& root = LLCreateHTTPWireServer(...);
- * root.addNode("llsdrpc/useful", new LLSDRPCNode<LLUsefulServer>);
- * root.addNode("xmlrpc/useful", new LLXMLRPCNode<LLUsefulServer>);
- * endcode
- */
- //@{
- template<class Server>
- class LLSDRPCServerFactory : public LLChainIOFactory
- {
- public:
- virtual bool build(LLPumpIO::chain_t& chain, LLSD context) const
- {
- lldebugs << "LLXMLSDRPCServerFactory::build" << llendl;
- chain.push_back(LLIOPipe::ptr_t(new Server));
- return true;
- }
- };
- template<class Server>
- class LLSDRPCNode : public LLHTTPNodeForFactory<
- LLSDRPCServerFactory<Server> >
- {
- };
- template<class Server>
- class LLXMLRPCServerFactory : public LLChainIOFactory
- {
- public:
- virtual bool build(LLPumpIO::chain_t& chain, LLSD context) const
- {
- lldebugs << "LLXMLSDRPCServerFactory::build" << llendl;
- chain.push_back(LLIOPipe::ptr_t(new LLFilterXMLRPCRequest2LLSD));
- chain.push_back(LLIOPipe::ptr_t(new Server));
- chain.push_back(LLIOPipe::ptr_t(new LLFilterSD2XMLRPCResponse));
- return true;
- }
- };
- template<class Server>
- class LLXMLRPCNode : public LLHTTPNodeForFactory<
- LLXMLRPCServerFactory<Server> >
- {
- };
- //@}
- #endif // LL_LLSDRPCSERVER_H