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- // Generates C++ tars service interface out of Protobuf IDL.
- //
- // This is a Proto2 compiler plugin. See net/proto2/compiler/proto/plugin.proto
- // and net/proto2/compiler/public/plugin.h for more information on plugins.
- #include <google/protobuf/compiler/code_generator.h>
- #include <google/protobuf/compiler/plugin.h>
- #include <google/protobuf/compiler/plugin.pb.h>
- #include <google/protobuf/descriptor.h>
- #include "CppGenCallback.h"
- static std::string GenCallbackMethod(const ::google::protobuf::MethodDescriptor* method, const std::string& pkg, int indent) {
- std::string out;
- out.reserve(8 * 1024);
- out = "virtual void callback_" + method->name() + "(const " + ToCppNamespace(method->output_type()->full_name()) + "& ret)" + LineFeed(indent);
- out += "{ throw std::runtime_error(\"callback_" + method->name() + " override incorrect.\"); }" + LineFeed(indent);
- out += "virtual void callback_" + method->name() + "_exception(tars::Int32 ret)" + LineFeed(indent);
- out += "{ throw std::runtime_error(\"callback_" + method->name() + "_exception() override incorrect.\"); }" + LineFeed(indent);
- return out;
- }
- static std::string GenResponseContext(int indent) {
- std::string out;
- out.reserve(8 * 1024);
- out += "virtual const map<std::string, std::string> & getResponseContext() const";
- out += LineFeed(indent);
- out += "{";
- out += LineFeed(++indent);
- out += "CallbackThreadData * pCbtd = CallbackThreadData::getData();";
- out += LineFeed(indent);
- out += LineFeed(indent);
- out += "assert(pCbtd != NULL);";
- out += LineFeed(indent);
- out += "if (!pCbtd->getContextValid())";
- out += LineFeed(indent);
- out += "{";
- out += LineFeed(++indent);
- out += "throw TC_Exception(\"can't get response context\");";
- out += LineFeed(--indent);
- out += "}";
- out += LineFeed(indent);
- out += "return pCbtd->getResponseContext();";
- out += LineFeed(--indent);
- out += "}";
- return out;
- }
- std::string GenPrxCallback(const ::google::protobuf::ServiceDescriptor* desc, int indent) {
- std::string out;
- out.reserve(8 * 1024);
- const auto& name = desc->name();
- const auto& pkg = desc->file()->package();
- out += "/* callback of async proxy for client */";
- out += LineFeed(indent);
- out += "class " + name + "PrxCallback : public tars::ServantProxyCallback" + LineFeed(indent);
- out += "{";
- out += LineFeed(indent);
- out += "public:" + LineFeed(++indent) + "virtual ~" + name + "PrxCallback() {}";
- out += LineFeed(indent);
- out += LineFeed(indent);
- //sort by method name
- std::map<std::string, const ::google::protobuf::MethodDescriptor*> m_method;
- for (int i = 0; i < desc->method_count(); ++i)
- {
- m_method[desc->method(i)->name()] = desc->method(i);
- }
- for(auto it = m_method.begin(); it != m_method.end(); ++it)
- {
- auto method = it->second;
- out += GenCallbackMethod(method, pkg, indent);
- }
- out += LineFeed(indent);
- out += LineFeed(indent);
- out += GenResponseContext(indent);
- // gen onDispatch
- out += LineFeed(indent);
- out += LineFeed(indent);
- out += "virtual int onDispatch(tars::ReqMessagePtr msg)";
- out += LineFeed(indent);
- out += "{";
- out += LineFeed(++indent);
- out += "static ::std::string __all[] = ";
- out += "{";
- out += LineFeed(++indent);
- for(auto it = m_method.begin(); it != m_method.end(); ++it)
- {
- auto method = it->second;
- out += "\"" + method->name() + "\",";
- out += LineFeed(indent);
- }
- out += LineFeed(--indent);
- out += "};" + LineFeed(indent);
- out += "pair<string*, string*> r = equal_range(__all, __all + " + std::to_string((long long)desc->method_count()) + ", " + "std::string(msg->request.sFuncName));";
- out += LineFeed(indent);
- out += "if(r.first == r.second) return tars::TARSSERVERNOFUNCERR;" + LineFeed(indent);
- out += "switch(r.first - __all)" + LineFeed(indent);
- out += "{";
- out += LineFeed(++indent);
- int i = 0;
- for(auto it = m_method.begin(); it != m_method.end(); ++it)
- {
- auto method = it->second;
- out += LineFeed(indent);
- out += "case " + std::to_string((long long)i) + ":" + LineFeed(indent);
- out += "{" + LineFeed(++indent);
- out += "if (msg->response->iRet != tars::TARSSERVERSUCCESS)" + LineFeed(indent);
- out += "{" + LineFeed(++indent);
- out += "callback_" + method->name() + "_exception(msg->response->iRet);" + LineFeed(indent);
- out += "return msg->response->iRet;" + LineFeed(--indent) + "}";
-
- out += LineFeed(indent);
- out += ToCppNamespace(method->output_type()->full_name()) + " _ret;" + LineFeed(indent);
- out += "_ret.ParseFromArray(msg->response->sBuffer.data(), msg->response->sBuffer.size());" + LineFeed(indent);
- out += "CallbackThreadData * pCbtd = CallbackThreadData::getData();" + LineFeed(indent);
- out += "assert(pCbtd != NULL);" + LineFeed(indent);
- out += LineFeed(indent);
- out += "pCbtd->setResponseContext(msg->response->context);" + LineFeed(indent);
- out += "callback_" + method->name() + "(_ret);" + LineFeed(indent);
- out += "pCbtd->delResponseContext();" + LineFeed(indent);
- out += LineFeed(indent);
- out += "return tars::TARSSERVERSUCCESS;";
- out += LineFeed(--indent);
- out += "}";
- ++i;
- }
- // end switch
- out += LineFeed(--indent);
- out += "}";
- out += LineFeed(indent);
- out += LineFeed(indent);
- out += "return tars::TARSSERVERNOFUNCERR;";
- out += LineFeed(--indent);
- out += "}"; // end of onDispatch
- out += LineFeed(--indent);
- out += "};"; // end of class CallbackPrx
- out += LineFeed(indent);
- out += "typedef tars::TC_AutoPtr<" + name + "PrxCallback> " + name + "PrxCallbackPtr;";
- out += LineFeed(indent);
- return out;
- }
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