1 //===--- Logger.cpp - Logger interface for clangd -------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "support/Logger.h"
10 #include "support/Trace.h"
11 #include "llvm/Support/Chrono.h"
12 #include "llvm/Support/Error.h"
13 #include "llvm/Support/FormatVariadic.h"
14 #include "llvm/Support/raw_ostream.h"
15 #include <mutex>
16 
17 namespace clang {
18 namespace clangd {
19 
20 namespace {
21 Logger *L = nullptr;
22 } // namespace
23 
24 LoggingSession::LoggingSession(clangd::Logger &Instance) {
25   assert(!L);
26   L = &Instance;
27 }
28 
29 LoggingSession::~LoggingSession() { L = nullptr; }
30 
31 void detail::logImpl(Logger::Level Level, const char *Fmt,
32                      const llvm::formatv_object_base &Message) {
33   if (L)
34     L->log(Level, Fmt, Message);
35   else {
36     static std::mutex Mu;
37     std::lock_guard<std::mutex> Guard(Mu);
38     llvm::errs() << Message << "\n";
39   }
40 }
41 
42 const char *detail::debugType(const char *Filename) {
43   if (const char *Slash = strrchr(Filename, '/'))
44     return Slash + 1;
45   if (const char *Backslash = strrchr(Filename, '\\'))
46     return Backslash + 1;
47   return Filename;
48 }
49 
50 void StreamLogger::log(Logger::Level Level, const char *Fmt,
51                        const llvm::formatv_object_base &Message) {
52   if (Level < MinLevel)
53     return;
54   llvm::sys::TimePoint<> Timestamp = std::chrono::system_clock::now();
55   trace::log(Message);
56   std::lock_guard<std::mutex> Guard(StreamMutex);
57   Logs << llvm::formatv("{0}[{1:%H:%M:%S.%L}] {2}\n", indicator(Level),
58                         Timestamp, Message);
59   Logs.flush();
60 }
61 
62 namespace {
63 // Like llvm::StringError but with fewer options and no gratuitous copies.
64 class SimpleStringError : public llvm::ErrorInfo<SimpleStringError> {
65   std::error_code EC;
66   std::string Message;
67 
68 public:
69   SimpleStringError(std::error_code EC, std::string &&Message)
70       : EC(EC), Message(std::move(Message)) {}
71   void log(llvm::raw_ostream &OS) const override { OS << Message; }
72   std::string message() const override { return Message; }
73   std::error_code convertToErrorCode() const override { return EC; }
74   static char ID;
75 };
76 char SimpleStringError::ID;
77 
78 } // namespace
79 
80 llvm::Error detail::error(std::error_code EC, std::string &&Msg) {
81   return llvm::make_error<SimpleStringError>(EC, std::move(Msg));
82 }
83 
84 } // namespace clangd
85 } // namespace clang
86