Add timestamps for logs (Project-OSRM#6375)

CHANGELOG.md

@@ -9,6 +9,7 @@
     - NodeJS:
       - FIXED: Support `skip_waypoints` in Node bindings [#6060](https://github.com/Project-OSRM/osrm-backend/pull/6060)
     - Misc:
+      - ADDED: Add timestamps for logs. [#6375](https://github.com/Project-OSRM/osrm-backend/pull/6375)
       - CHANGED: Improve performance of map matching via getPathDistance optimization. [#6378](https://github.com/Project-OSRM/osrm-backend/pull/6378)
       - CHANGED: Optimize RestrictionParser performance. [#6344](https://github.com/Project-OSRM/osrm-backend/pull/6344)
       - ADDED: Support floats for speed value in traffic updates CSV. [#6327](https://github.com/Project-OSRM/osrm-backend/pull/6327)

CMakeLists.txt

@@ -456,6 +456,11 @@ add_subdirectory(${FLATBUFFERS_SRC_DIR}
         ${CMAKE_CURRENT_BINARY_DIR}/flatbuffers-build
         EXCLUDE_FROM_ALL)
 
+set(FMT_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/third_party/fmt-9.1.0/include")
+add_compile_definitions(FMT_HEADER_ONLY)
+include_directories(SYSTEM ${FMT_INCLUDE_DIR})
+
+
 # see https://stackoverflow.com/questions/70898030/boost-link-error-using-conan-find-package
 if (MSVC)
   add_definitions(-DBOOST_ALL_NO_LIB)

src/util/log.cpp

@@ -2,6 +2,7 @@
 #include "util/isatty.hpp"
 #include <boost/algorithm/string/predicate.hpp>
 #include <cstdio>
+#include <fmt/chrono.h>
 #include <iostream>
 #include <mutex>
 #include <string>
@@ -73,23 +74,33 @@ void Log::Init()
     if (!LogPolicy::GetInstance().IsMute() && level <= LogPolicy::GetInstance().GetLevel())
     {
         const bool is_terminal = IsStdoutATTY();
+
+        auto format = [is_terminal](const char *level, const char *color) {
+            const auto timestamp = std::chrono::system_clock::now();
+            return fmt::format("{}[{:%FT%H:%M:}{:%S}] [{}] ",
+                               is_terminal ? color : "",
+                               timestamp,
+                               timestamp.time_since_epoch(),
+                               level);
+        };
+
         switch (level)
         {
         case logNONE:
             break;
         case logWARNING:
-            stream << (is_terminal ? YELLOW : "") << "[warn] ";
+            stream << format("warn", YELLOW);
             break;
         case logERROR:
-            stream << (is_terminal ? RED : "") << "[error] ";
+            stream << format("error", RED);
             break;
         case logDEBUG:
 #ifdef ENABLE_DEBUG_LOGGING
-            stream << (is_terminal ? MAGENTA : "") << "[debug] ";
+            stream << format("debug", MAGENTA);
 #endif
             break;
         default: // logINFO:
-            stream << "[info] ";
+            stream << format("info", "");
             break;
         }
     }

third_party/fmt-9.1.0/.clang-format

@@ -0,0 +1,8 @@
+# Run manually to reformat a file:
+# clang-format -i --style=file <file>
+Language: Cpp
+BasedOnStyle: Google
+IndentPPDirectives: AfterHash
+IndentCaseLabels: false
+AlwaysBreakTemplateDeclarations: false
+DerivePointerAlignment: false