Move gRPC/Protobuf logs handling to a dedicated file.

src/grpc_log.cpp

@@ -0,0 +1,52 @@
+#include "ngx.hpp"
+
+#include "grpc_log.hpp"
+
+#include <grpc/support/log.h>
+#include <google/protobuf/stubs/logging.h>
+
+class ProtobufLog {
+public:
+    ProtobufLog() { google::protobuf::SetLogHandler(protobufLogHandler); }
+    ~ProtobufLog() { google::protobuf::SetLogHandler(NULL); }
+
+private:
+    static void protobufLogHandler(google::protobuf::LogLevel logLevel,
+        const char* filename, int line, const std::string& msg)
+    {
+        using namespace google::protobuf;
+
+        ngx_uint_t level = logLevel == LOGLEVEL_FATAL   ? NGX_LOG_EMERG :
+                           logLevel == LOGLEVEL_ERROR   ? NGX_LOG_ERR :
+                           logLevel == LOGLEVEL_WARNING ? NGX_LOG_WARN :
+                                     /*LOGLEVEL_INFO*/    NGX_LOG_INFO;
+
+        ngx_log_error(level, ngx_cycle->log, 0, "OTel/protobuf: %s",
+            msg.c_str());
+    }
+};
+
+class GrpcLog {
+public:
+    GrpcLog() { gpr_set_log_function(grpcLogHandler); }
+    ~GrpcLog() { gpr_set_log_function(NULL); }
+
+private:
+    static void grpcLogHandler(gpr_log_func_args* args)
+    {
+        ngx_uint_t level =
+            args->severity == GPR_LOG_SEVERITY_ERROR ? NGX_LOG_ERR :
+            args->severity == GPR_LOG_SEVERITY_INFO  ? NGX_LOG_INFO :
+                            /*GPR_LOG_SEVERITY_DEBUG*/ NGX_LOG_DEBUG;
+
+        ngx_log_error(level, ngx_cycle->log, 0, "OTel/grpc: %s",
+            args->message);
+    }
+
+    ProtobufLog protoLog;
+};
+
+void initGrpcLog()
+{
+    static GrpcLog init;
+}