From 426988b000d9a8b61787f72232ab9e9b7f2c67cd Mon Sep 17 00:00:00 2001
From: Michele Caini <michele.caini@gmail.com>
Date: Fri, 19 May 2023 14:57:15 +0200
Subject: [PATCH] loop: metrics

---
 src/uvw/loop.cpp  | 6 ++++++
 src/uvw/loop.h    | 8 ++++++++
 test/uvw/loop.cpp | 8 ++++++++
 3 files changed, 22 insertions(+)

diff --git a/src/uvw/loop.cpp b/src/uvw/loop.cpp
index 320d8139..e3ab8702 100644
--- a/src/uvw/loop.cpp
+++ b/src/uvw/loop.cpp
@@ -87,6 +87,12 @@ UVW_INLINE loop::time loop::idle_time() const noexcept {
     return time{uv_metrics_idle_time(uv_loop.get())};
 }
 
+UVW_INLINE metrics_type loop::metrics() const noexcept {
+    metrics_type res{};
+    uv_metrics_info(uv_loop.get(), &res);
+    return res;
+}
+
 UVW_INLINE loop::time loop::now() const noexcept {
     return time{uv_now(uv_loop.get())};
 }
diff --git a/src/uvw/loop.h b/src/uvw/loop.h
index 7cd97757..67a0f9cd 100644
--- a/src/uvw/loop.h
+++ b/src/uvw/loop.h
@@ -47,6 +47,8 @@ enum class uvw_run_mode : std::underlying_type_t<uv_run_mode> {
 
 } // namespace details
 
+using metrics_type = uv_metrics_t; /*!< Library equivalent for uv_metrics_t. */
+
 /**
  * @brief The loop class.
  *
@@ -236,6 +238,12 @@ public:
      */
     time idle_time() const noexcept;
 
+    /**
+     * @brief Tracks various internal operations of the event loop.
+     * @return Event loop metrics.
+     */
+    metrics_type metrics() const noexcept;
+
     /**
      * @brief Returns the current timestamp in milliseconds.
      *
diff --git a/test/uvw/loop.cpp b/test/uvw/loop.cpp
index 142c9529..d42ab4ce 100644
--- a/test/uvw/loop.cpp
+++ b/test/uvw/loop.cpp
@@ -124,6 +124,14 @@ TEST(Loop, IdleTime) {
     ASSERT_EQ(0, loop->close());
 }
 
+TEST(Loop, Metrics) {
+    auto loop = uvw::loop::create();
+    uvw::metrics_type metrics = loop->metrics();
+    ASSERT_EQ(0, metrics.loop_count);
+    ASSERT_EQ(0, metrics.events);
+    ASSERT_EQ(0, metrics.events_waiting);
+}
+
 TEST(Loop, Raw) {
     auto loop = uvw::loop::get_default();
     const auto &cloop = uvw::loop::get_default();