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