ethtool-lua + prometheus-node-exporter-lua plugin

libs/ethtool-lua/Makefile

@@ -0,0 +1,38 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=ethtool-lua
+PKG_VERSION:=0.1.0
+PKG_RELEASE:=1
+
+PKG_BUILD_DIR:=$(BUILD_DIR)/ethtool-lua-$(PKG_VERSION)
+PKG_SOURCE:=v${PKG_VERSION}.tar.gz
+PKG_SOURCE_URL:=https://github.com/Kevinjil/ethtool-lua/archive/refs/tags/
+PKG_HASH:=e2716bf87487f8105a441420d003179ffcc5ef9575232846ace0150dfad0b504
+
+PKG_MAINTAINER:=Kevin Jilissen <info@kevinjilissen.nl>
+PKG_LICENSE:=AGPL-3.0-or-later
+PKG_LICENSE_FILES:=COPYING
+
+CMAKE_INSTALL:=1
+
+include $(INCLUDE_DIR)/package.mk
+include $(INCLUDE_DIR)/cmake.mk
+
+define Package/ethtool-lua
+  SECTION:=libs
+  CATEGORY:=Libraries
+  TITLE:=ethtool lua library
+  URL:=https://github.com/kevinjil/ethtool-lua
+  DEPENDS:=+liblua
+endef
+
+define Package/ethtool-lua/description
+  ethtool-lua provides a lua library for gathering ethtool driver statistics.
+endef
+
+define Package/ethtool-lua/install
+	$(INSTALL_DIR) $(1)/usr/lib/lua
+	$(CP) $(PKG_BUILD_DIR)/ethtool.so $(1)/usr/lib/lua/
+endef
+
+$(eval $(call BuildPackage,ethtool-lua))

utils/prometheus-node-exporter-lua/Makefile

@@ -246,6 +246,17 @@ define Package/prometheus-node-exporter-lua-realtek-poe/install
 	$(INSTALL_BIN) ./files/usr/lib/lua/prometheus-collectors/realtek-poe.lua $(1)/usr/lib/lua/prometheus-collectors/
 endef
 
+define Package/prometheus-node-exporter-lua-ethtool-stats
+  $(call Package/prometheus-node-exporter-lua/Default)
+  TITLE+= (ethtool-stats collector)
+  DEPENDS:=prometheus-node-exporter-lua +ethtool-lua
+endef
+
+define Package/prometheus-node-exporter-lua-ethtool-stats/install
+	$(INSTALL_DIR) $(1)/usr/lib/lua/prometheus-collectors
+	$(INSTALL_BIN) ./files/usr/lib/lua/prometheus-collectors/ethtool-stats.lua $(1)/usr/lib/lua/prometheus-collectors/
+endef
+
 $(eval $(call BuildPackage,prometheus-node-exporter-lua))
 $(eval $(call BuildPackage,prometheus-node-exporter-lua-bmx7))
 $(eval $(call BuildPackage,prometheus-node-exporter-lua-dawn))
@@ -264,3 +275,4 @@ $(eval $(call BuildPackage,prometheus-node-exporter-lua-wifi))
 $(eval $(call BuildPackage,prometheus-node-exporter-lua-wifi_stations))
 $(eval $(call BuildPackage,prometheus-node-exporter-lua-snmp6))
 $(eval $(call BuildPackage,prometheus-node-exporter-lua-realtek-poe))
+$(eval $(call BuildPackage,prometheus-node-exporter-lua-ethtool-stats))

utils/prometheus-node-exporter-lua/files/usr/lib/lua/prometheus-collectors/ethtool-stats.lua

@@ -0,0 +1,38 @@
+local ethtool = require "ethtool"
+
+local pattern_device = "^%s*([^%s:]+):"
+local pattern_metric = "^([a-zA-Z0-9:_]+)$"
+
+local function get_devices()
+  local devices = {}
+  for line in io.lines("/proc/net/dev") do
+    local dev = string.match(line, pattern_device)
+    if dev then
+      table.insert(devices, dev)
+    end
+  end
+  return devices
+end
+
+local function scrape()
+  local eth = ethtool.open()
+  local metrics = {}
+  for _, dev in ipairs(get_devices()) do
+    local stats = eth:statistics(dev)
+    if stats then
+      for m_name, m_value in pairs(stats) do
+        if string.match(m_name, pattern_metric) then
+          local m = metrics[m_name]
+          if m == nil then
+            m = metric("ethtool_" .. m_name, "counter")
+            metrics[m_name] = m
+          end
+          m({device=dev}, m_value)
+        end
+      end
+    end
+  end
+  eth:close()
+end
+
+return { scrape = scrape }