forked from OSchip/llvm-project
86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
//===--- JSONRPCDispatcher.h - Main JSON parser entry point -----*- C++ -*-===//
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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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#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_JSONRPCDISPATCHER_H
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#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_JSONRPCDISPATCHER_H
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#include "clang/Basic/LLVM.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/Support/YAMLParser.h"
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#include <mutex>
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namespace clang {
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namespace clangd {
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/// Encapsulates output and logs streams and provides thread-safe access to
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/// them.
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class JSONOutput {
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public:
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JSONOutput(llvm::raw_ostream &Outs, llvm::raw_ostream &Logs)
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: Outs(Outs), Logs(Logs) {}
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/// Emit a JSONRPC message.
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void writeMessage(const Twine &Message);
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/// Write to the logging stream.
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void log(const Twine &Message);
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private:
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llvm::raw_ostream &Outs;
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llvm::raw_ostream &Logs;
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std::mutex StreamMutex;
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};
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/// Callback for messages sent to the server, called by the JSONRPCDispatcher.
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class Handler {
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public:
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Handler(JSONOutput &Output) : Output(Output) {}
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virtual ~Handler() = default;
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/// Called when the server receives a method call. This is supposed to return
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/// a result on Outs. The default implementation returns an "unknown method"
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/// error to the client and logs a warning.
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virtual void handleMethod(llvm::yaml::MappingNode *Params, StringRef ID);
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/// Called when the server receives a notification. No result should be
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/// written to Outs. The default implemetation logs a warning.
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virtual void handleNotification(llvm::yaml::MappingNode *Params);
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protected:
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JSONOutput &Output;
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/// Helper to write a JSONRPC result to Output.
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void writeMessage(const Twine &Message) { Output.writeMessage(Message); }
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};
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/// Main JSONRPC entry point. This parses the JSONRPC "header" and calls the
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/// registered Handler for the method received.
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class JSONRPCDispatcher {
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public:
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/// Create a new JSONRPCDispatcher. UnknownHandler is called when an unknown
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/// method is received.
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JSONRPCDispatcher(std::unique_ptr<Handler> UnknownHandler)
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: UnknownHandler(std::move(UnknownHandler)) {}
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/// Registers a Handler for the specified Method.
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void registerHandler(StringRef Method, std::unique_ptr<Handler> H);
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/// Parses a JSONRPC message and calls the Handler for it.
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bool call(StringRef Content) const;
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private:
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llvm::StringMap<std::unique_ptr<Handler>> Handlers;
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std::unique_ptr<Handler> UnknownHandler;
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};
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} // namespace clangd
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} // namespace clang
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#endif
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