forked from OSchip/llvm-project
125 lines
3.9 KiB
C++
125 lines
3.9 KiB
C++
//===--- JSONRPCDispatcher.cpp - Main JSON parser entry point -------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "JSONRPCDispatcher.h"
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#include "ProtocolHandlers.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/YAMLParser.h"
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using namespace clang;
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using namespace clangd;
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void Handler::writeMessage(const Twine &Message) {
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llvm::SmallString<128> Storage;
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StringRef M = Message.toStringRef(Storage);
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// Log without headers.
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Logs << "--> " << M << '\n';
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Logs.flush();
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// Emit message with header.
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Outs << "Content-Length: " << M.size() << "\r\n\r\n" << M;
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Outs.flush();
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}
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void Handler::handleMethod(llvm::yaml::MappingNode *Params, StringRef ID) {
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Logs << "Method ignored.\n";
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// Return that this method is unsupported.
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writeMessage(
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R"({"jsonrpc":"2.0","id":)" + ID +
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R"(,"error":{"code":-32601}})");
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}
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void Handler::handleNotification(llvm::yaml::MappingNode *Params) {
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Logs << "Notification ignored.\n";
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}
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void JSONRPCDispatcher::registerHandler(StringRef Method,
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std::unique_ptr<Handler> H) {
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assert(!Handlers.count(Method) && "Handler already registered!");
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Handlers[Method] = std::move(H);
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}
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static void
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callHandler(const llvm::StringMap<std::unique_ptr<Handler>> &Handlers,
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llvm::yaml::ScalarNode *Method, llvm::yaml::ScalarNode *Id,
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llvm::yaml::MappingNode *Params, Handler *UnknownHandler) {
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llvm::SmallString<10> MethodStorage;
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auto I = Handlers.find(Method->getValue(MethodStorage));
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auto *Handler = I != Handlers.end() ? I->second.get() : UnknownHandler;
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if (Id)
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Handler->handleMethod(Params, Id->getRawValue());
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else
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Handler->handleNotification(Params);
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}
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bool JSONRPCDispatcher::call(StringRef Content) const {
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llvm::SourceMgr SM;
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llvm::yaml::Stream YAMLStream(Content, SM);
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auto Doc = YAMLStream.begin();
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if (Doc == YAMLStream.end())
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return false;
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auto *Root = Doc->getRoot();
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if (!Root)
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return false;
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auto *Object = dyn_cast<llvm::yaml::MappingNode>(Root);
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if (!Object)
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return false;
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llvm::yaml::ScalarNode *Version = nullptr;
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llvm::yaml::ScalarNode *Method = nullptr;
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llvm::yaml::MappingNode *Params = nullptr;
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llvm::yaml::ScalarNode *Id = nullptr;
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for (auto &NextKeyValue : *Object) {
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auto *KeyString = dyn_cast<llvm::yaml::ScalarNode>(NextKeyValue.getKey());
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if (!KeyString)
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return false;
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llvm::SmallString<10> KeyStorage;
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StringRef KeyValue = KeyString->getValue(KeyStorage);
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llvm::yaml::Node *Value = NextKeyValue.getValue();
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if (!Value)
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return false;
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if (KeyValue == "jsonrpc") {
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// This should be "2.0". Always.
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Version = dyn_cast<llvm::yaml::ScalarNode>(Value);
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if (!Version || Version->getRawValue() != "\"2.0\"")
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return false;
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} else if (KeyValue == "method") {
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Method = dyn_cast<llvm::yaml::ScalarNode>(Value);
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} else if (KeyValue == "id") {
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Id = dyn_cast<llvm::yaml::ScalarNode>(Value);
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} else if (KeyValue == "params") {
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if (!Method)
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return false;
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// We have to interleave the call of the function here, otherwise the
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// YAMLParser will die because it can't go backwards. This is unfortunate
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// because it will break clients that put the id after params. A possible
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// fix would be to split the parsing and execution phases.
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Params = dyn_cast<llvm::yaml::MappingNode>(Value);
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callHandler(Handlers, Method, Id, Params, UnknownHandler.get());
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return true;
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} else {
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return false;
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}
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}
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// In case there was a request with no params, call the handler on the
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// leftovers.
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if (!Method)
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return false;
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callHandler(Handlers, Method, Id, nullptr, UnknownHandler.get());
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return true;
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}
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