From 27cb27a38328adc3c27f06e46944be3514f1baeb Mon Sep 17 00:00:00 2001
From: Roman Lebedev <lebedev.ri@gmail.com>
Date: Wed, 24 Jan 2024 02:33:35 +0300
Subject: [PATCH] JSON reporter: store library version and schema version in
 `context`

---
 src/CMakeLists.txt           |  7 +++++++
 src/json_reporter.cc         | 12 ++++++++++++
 test/reporter_output_test.cc |  3 +++
 3 files changed, 22 insertions(+)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index daf82fb131..4e5432d790 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -28,6 +28,13 @@ target_include_directories(benchmark PUBLIC
   $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
 )
 
+set_property(
+  SOURCE json_reporter.cc
+  APPEND
+  PROPERTY COMPILE_DEFINITIONS
+  BENCHMARK_VERSION="${VERSION}"
+)
+
 # libpfm, if available
 if (PFM_FOUND)
   target_link_libraries(benchmark PRIVATE PFM::libpfm)
diff --git a/src/json_reporter.cc b/src/json_reporter.cc
index 6559dfd5e6..bb0b9a1bfc 100644
--- a/src/json_reporter.cc
+++ b/src/json_reporter.cc
@@ -167,12 +167,24 @@ bool JSONReporter::ReportContext(const Context& context) {
   }
   out << "],\n";
 
+#if defined(BENCHMARK_VERSION)
+  const char library_version[] = BENCHMARK_VERSION;
+#else
+  const char library_version[] = "hello, bazel!";
+#endif
+  out << indent << FormatKV("library_version", library_version);
+  out << ",\n";
+
 #if defined(NDEBUG)
   const char build_type[] = "release";
 #else
   const char build_type[] = "debug";
 #endif
   out << indent << FormatKV("library_build_type", build_type);
+  out << ",\n";
+
+  // NOTE: our json schema is not strictly tied to the library version!
+  out << indent << FormatKV("json_schema_version", int64_t(1));
 
   std::map<std::string, std::string>* global_context =
       internal::GetGlobalContext();
diff --git a/test/reporter_output_test.cc b/test/reporter_output_test.cc
index 657a9a1079..ea5381d20b 100644
--- a/test/reporter_output_test.cc
+++ b/test/reporter_output_test.cc
@@ -55,6 +55,9 @@ static int AddContextCases() {
              {{"Load Average: (%float, ){0,2}%float$", MR_Next}});
   }
   AddCases(TC_JSONOut, {{"\"load_avg\": \\[(%float,?){0,3}],$", MR_Next}});
+  AddCases(TC_JSONOut, {{"\"library_version\": \".*\",$", MR_Next}});
+  AddCases(TC_JSONOut, {{"\"library_build_type\": \".*\",$", MR_Next}});
+  AddCases(TC_JSONOut, {{"\"json_schema_version\": 1$", MR_Next}});
   return 0;
 }
 int dummy_register = AddContextCases();