/** * @file llsdrpcclient.h * @author Phoenix * @date 2005-11-05 * @brief Implementation and helpers for structure data RPC clients. * * $LicenseInfo:firstyear=2005&license=viewerlgpl$ * Second Life Viewer Source Code * Copyright (C) 2010, Linden Research, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License only. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA * $/LicenseInfo$ */ #ifndef LL_LLSDRPCCLIENT_H #define LL_LLSDRPCCLIENT_H /** * This file declares classes to encapsulate a basic structured data * remote procedure client. */ #include "llchainio.h" #include "llfiltersd2xmlrpc.h" #include "lliopipe.h" #include "llurlrequest.h" /** * @class LLSDRPCClientResponse * @brief Abstract base class to represent a response from an SD server. * * This is used as a base class for callbacks generated from an * structured data remote procedure call. The * <code>extractResponse</code> method will deal with the llsdrpc method * call overhead, and keep track of what to call during the next call * into <code>process</code>. If you use this as a base class, you * need to implement <code>response</code>, <code>fault</code>, and * <code>error</code> to do something useful. When in those methods, * you can parse and utilize the mReturnValue member data. */ class LLSDRPCResponse : public LLIOPipe { public: LLSDRPCResponse(); virtual ~LLSDRPCResponse(); /** * @brief This method extracts the response out of the sd passed in * * Any appropriate data found in the sd passed in will be * extracted and managed by this object - not copied or cloned. It * will still be up to the caller to delete the pointer passed in. * @param sd The raw structured data response from the remote server. * @return Returns true if this was able to parse the structured data. */ bool extractResponse(const LLSD& sd); protected: /** * @brief Method called when the response is ready. */ virtual bool response(LLPumpIO* pump) = 0; /** * @brief Method called when a fault is generated by the remote server. */ virtual bool fault(LLPumpIO* pump) = 0; /** * @brief Method called when there was an error */ virtual bool error(LLPumpIO* pump) = 0; 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: LLSD mReturnValue; bool mIsError; bool mIsFault; }; /** * @class LLSDRPCClient * @brief Client class for a structured data remote procedure call. * * This class helps deal with making structured data calls to a remote * server. You can visualize the calls as: * <code> * response = uri.method(parameter) * </code> * where you pass in everything to <code>call</code> and this class * takes care of the rest of the details. * In typical usage, you will derive a class from this class and * provide an API more useful for the specific application at * hand. For example, if you were writing a service to send an instant * message, you could create an API for it to send the messsage, and * that class would do the work of translating it into the method and * parameter, find the destination, and invoke <code>call</call> with * a useful implementation of LLSDRPCResponse passed in to handle the * response from the network. */ class LLSDRPCClient : public LLIOPipe { public: LLSDRPCClient(); virtual ~LLSDRPCClient(); /** * @brief Enumeration for tracking which queue to process the * response. */ enum EPassBackQueue { EPBQ_PROCESS, EPBQ_CALLBACK, }; /** * @brief Call a method on a remote LLSDRPCServer * * @param uri The remote object to call, eg, * http://localhost/usher. If you are using a factory with a fixed * url, the uri passed in will probably be ignored. * @param method The method to call on the remote object * @param parameter The parameter to pass into the remote * object. It is up to the caller to delete the value passed in. * @param response The object which gets the response. * @param queue Specifies to call the response on the process or * callback queue. * @return Returns true if this object will be able to make the RPC call. */ bool call( const std::string& uri, const std::string& method, const LLSD& parameter, LLSDRPCResponse* response, EPassBackQueue queue); /** * @brief Call a method on a remote LLSDRPCServer * * @param uri The remote object to call, eg, * http://localhost/usher. If you are using a factory with a fixed * url, the uri passed in will probably be ignored. * @param method The method to call on the remote object * @param parameter The seriailized parameter to pass into the * remote object. * @param response The object which gets the response. * @param queue Specifies to call the response on the process or * callback queue. * @return Returns true if this object will be able to make the RPC call. */ bool call( const std::string& uri, const std::string& method, const std::string& parameter, LLSDRPCResponse* response, EPassBackQueue queue); protected: /** * @brief Enumeration for tracking client state. */ enum EState { STATE_NONE, STATE_READY, STATE_WAITING_FOR_RESPONSE, STATE_DONE }; /* @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: EState mState; std::string mURI; std::string mRequest; EPassBackQueue mQueue; LLIOPipe::ptr_t mResponse; }; /** * @class LLSDRPCClientFactory * @brief Basic implementation for making an SD RPC client factory * * This class eases construction of a basic sd rpc client. Here is an * example of it's use: * <code> * class LLUsefulService : public LLService { ... } * LLService::registerCreator( * "useful", * LLService::creator_t(new LLSDRPCClientFactory<LLUsefulService>)) * </code> */ template<class Client> class LLSDRPCClientFactory : public LLChainIOFactory { public: LLSDRPCClientFactory() {} LLSDRPCClientFactory(const std::string& fixed_url) : mURL(fixed_url) {} virtual bool build(LLPumpIO::chain_t& chain, LLSD context) const { lldebugs << "LLSDRPCClientFactory::build" << llendl; LLIOPipe::ptr_t service(new Client); chain.push_back(service); LLURLRequest* http(new LLURLRequest(LLURLRequest::HTTP_POST)); LLIOPipe::ptr_t http_pipe(http); http->addHeader("Content-Type: text/llsd"); if(mURL.empty()) { chain.push_back(LLIOPipe::ptr_t(new LLContextURLExtractor(http))); } else { http->setURL(mURL); } chain.push_back(http_pipe); chain.push_back(service); return true; } protected: std::string mURL; }; /** * @class LLXMLSDRPCClientFactory * @brief Basic implementation for making an XMLRPC to SD RPC client factory * * This class eases construction of a basic sd rpc client which uses * xmlrpc as a serialization grammar. Here is an example of it's use: * <code> * class LLUsefulService : public LLService { ... } * LLService::registerCreator( * "useful", * LLService::creator_t(new LLXMLSDRPCClientFactory<LLUsefulService>)) * </code> */ template<class Client> class LLXMLSDRPCClientFactory : public LLChainIOFactory { public: LLXMLSDRPCClientFactory() {} LLXMLSDRPCClientFactory(const std::string& fixed_url) : mURL(fixed_url) {} virtual bool build(LLPumpIO::chain_t& chain, LLSD context) const { lldebugs << "LLXMLSDRPCClientFactory::build" << llendl; LLIOPipe::ptr_t service(new Client); chain.push_back(service); LLURLRequest* http(new LLURLRequest(LLURLRequest::HTTP_POST)); LLIOPipe::ptr_t http_pipe(http); http->addHeader("Content-Type: text/xml"); if(mURL.empty()) { chain.push_back(LLIOPipe::ptr_t(new LLContextURLExtractor(http))); } else { http->setURL(mURL); } chain.push_back(LLIOPipe::ptr_t(new LLFilterSD2XMLRPCRequest(NULL))); chain.push_back(http_pipe); chain.push_back(LLIOPipe::ptr_t(new LLFilterXMLRPCResponse2LLSD)); chain.push_back(service); return true; } protected: std::string mURL; }; #endif // LL_LLSDRPCCLIENT_H