From 9a1f5290ba141e721d95f3cbae8830344fb74bcc Mon Sep 17 00:00:00 2001
From: Moritz Bunkus <mo@bunkus.online>
Date: Tue, 26 Apr 2022 22:25:14 +0200
Subject: [PATCH] logger: add class for logging a scope's lifetime

---
 src/common/logger.cpp | 13 +++++++++++++
 src/common/logger.h   | 11 +++++++++++
 2 files changed, 24 insertions(+)

diff --git a/src/common/logger.cpp b/src/common/logger.cpp
index 1fe67739b..6d9df5280 100644
--- a/src/common/logger.cpp
+++ b/src/common/logger.cpp
@@ -132,6 +132,19 @@ stderr_target_c::log_line(std::string const &message) {
 
 // ----------------------------------------------------------------------
 
+lifetime_logger_c::lifetime_logger_c(std::string const &comment)
+  : m_comment{comment}
+  , m_start{mtx::sys::get_current_time_millis()}
+{
+  target_c::get_default_logger() << fmt::format("lifetime log start for {0}\n", m_comment);
+}
+
+lifetime_logger_c::~lifetime_logger_c() {
+  target_c::get_default_logger() << fmt::format("lifetime log runtime +{0}ms for {1}\n", mtx::sys::get_current_time_millis() - m_start, m_comment);
+}
+
+// ----------------------------------------------------------------------
+
 void
 init() {
   s_program_start_time = QDateTime::currentDateTime();
diff --git a/src/common/logger.h b/src/common/logger.h
index ee7238320..b3acb598d 100644
--- a/src/common/logger.h
+++ b/src/common/logger.h
@@ -43,6 +43,16 @@ public:
   static int64_t runtime();
 };
 
+class lifetime_logger_c {
+private:
+  std::string const m_comment;
+  int64_t m_start{};
+
+public:
+  lifetime_logger_c(std::string const &comment);
+  ~lifetime_logger_c();
+};
+
 class file_target_c: public target_c {
 private:
   std::filesystem::path m_file_name;
@@ -77,4 +87,5 @@ void init();
 }
 
 #define log_current_location() mtx::log::target_c::get_default_logger() << fmt::format("Current file, line, function: {0}:{1} in {2}", __FILE__, __LINE__, __PRETTY_FUNCTION__)
+#define log_scope_lifetime()   mtx::log::lifetime_logger_c mtx_scope_lifetime_logger{fmt::format("{0}:{1} in {2}", __FILE__, __LINE__, __PRETTY_FUNCTION__)}
 #define log_it(arg)            mtx::log::target_c::get_default_logger() << (arg)