mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-20 23:46:09 +01:00
119 lines
3.1 KiB
Go
119 lines
3.1 KiB
Go
// Copyright 2016 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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// Based on gopsutil/cpu/cpu_darwin_cgo.go @ ae251eb which is licensed under
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// BSD. See https://github.com/shirou/gopsutil/blob/master/LICENSE for details.
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// +build !nocpu
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package collector
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"strconv"
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"unsafe"
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"github.com/prometheus/client_golang/prometheus"
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)
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/*
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#cgo LDFLAGS:
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#include <stdlib.h>
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#include <sys/sysctl.h>
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#include <sys/mount.h>
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#include <mach/mach_init.h>
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#include <mach/mach_host.h>
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#include <mach/host_info.h>
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#if TARGET_OS_MAC
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#include <libproc.h>
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#endif
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#include <mach/processor_info.h>
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#include <mach/vm_map.h>
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*/
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import "C"
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// ClocksPerSec default value. from time.h
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const ClocksPerSec = float64(128)
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type statCollector struct {
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cpu *prometheus.Desc
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}
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func init() {
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Factories["cpu"] = NewCPUCollector
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}
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// NewCPUCollector returns a new Collector exposing CPU stats.
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func NewCPUCollector() (Collector, error) {
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return &statCollector{
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cpu: prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, "", "cpu"),
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"Seconds the cpus spent in each mode.",
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[]string{"cpu", "mode"}, nil,
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),
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}, nil
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}
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func (c *statCollector) Update(ch chan<- prometheus.Metric) error {
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var (
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count C.mach_msg_type_number_t
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cpuload *C.processor_cpu_load_info_data_t
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ncpu C.natural_t
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)
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status := C.host_processor_info(C.host_t(C.mach_host_self()),
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C.PROCESSOR_CPU_LOAD_INFO,
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&ncpu,
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(*C.processor_info_array_t)(unsafe.Pointer(&cpuload)),
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&count)
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if status != C.KERN_SUCCESS {
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return fmt.Errorf("host_processor_info error=%d", status)
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}
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// jump through some cgo casting hoops and ensure we properly free
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// the memory that cpuload points to
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target := C.vm_map_t(C.mach_task_self_)
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address := C.vm_address_t(uintptr(unsafe.Pointer(cpuload)))
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defer C.vm_deallocate(target, address, C.vm_size_t(ncpu))
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// the body of struct processor_cpu_load_info
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// aka processor_cpu_load_info_data_t
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var cpuTicks [C.CPU_STATE_MAX]uint32
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// copy the cpuload array to a []byte buffer
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// where we can binary.Read the data
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size := int(ncpu) * binary.Size(cpuTicks)
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buf := (*[1 << 30]byte)(unsafe.Pointer(cpuload))[:size:size]
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bbuf := bytes.NewBuffer(buf)
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for i := 0; i < int(ncpu); i++ {
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err := binary.Read(bbuf, binary.LittleEndian, &cpuTicks)
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if err != nil {
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return err
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}
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for k, v := range map[string]int{
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"user": C.CPU_STATE_USER,
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"system": C.CPU_STATE_SYSTEM,
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"nice": C.CPU_STATE_NICE,
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"idle": C.CPU_STATE_IDLE,
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} {
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ch <- prometheus.MustNewConstMetric(c.cpu, prometheus.CounterValue, float64(cpuTicks[v])/ClocksPerSec, "cpu"+strconv.Itoa(i), k)
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}
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}
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return nil
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}
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