mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-11-12 16:44:18 -08:00
77 lines
2.1 KiB
Go
77 lines
2.1 KiB
Go
// Copyright 2024 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !nocpu
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// +build !nocpu
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package collector
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/*
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#include <unistd.h> // Include the standard Unix header
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#include <errno.h> // For errno
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*/
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import "C"
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import (
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"fmt"
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"log/slog"
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"strconv"
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"github.com/power-devops/perfstat"
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"github.com/prometheus/client_golang/prometheus"
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)
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type cpuCollector struct {
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cpu typedDesc
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logger *slog.Logger
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tickPerSecond int64
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}
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func init() {
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registerCollector("cpu", defaultEnabled, NewCpuCollector)
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}
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func tickPerSecond() (int64, error) {
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ticks, err := C.sysconf(C._SC_CLK_TCK)
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if ticks == -1 || err != nil {
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return 0, fmt.Errorf("failed to get clock ticks per second: %v", err)
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}
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return int64(ticks), nil
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}
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func NewCpuCollector(logger *slog.Logger) (Collector, error) {
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ticks, err := tickPerSecond()
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if err != nil {
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return nil, err
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}
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return &cpuCollector{
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cpu: typedDesc{nodeCPUSecondsDesc, prometheus.CounterValue},
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logger: logger,
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tickPerSecond: ticks,
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}, nil
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}
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func (c *cpuCollector) Update(ch chan<- prometheus.Metric) error {
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stats, err := perfstat.CpuStat()
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if err != nil {
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return err
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}
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for n, stat := range stats {
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ch <- c.cpu.mustNewConstMetric(float64(stat.User/c.tickPerSecond), strconv.Itoa(n), "user")
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ch <- c.cpu.mustNewConstMetric(float64(stat.Sys/c.tickPerSecond), strconv.Itoa(n), "system")
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ch <- c.cpu.mustNewConstMetric(float64(stat.Idle/c.tickPerSecond), strconv.Itoa(n), "idle")
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ch <- c.cpu.mustNewConstMetric(float64(stat.Wait/c.tickPerSecond), strconv.Itoa(n), "wait")
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}
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return nil
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}
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