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// Copyright 2021 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 !notherm
// +build !notherm
package collector
/*
#cgo LDFLAGS: -framework IOKit -framework CoreFoundation
#include <stdio.h>
#include <CoreFoundation/CoreFoundation.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/pwr_mgt/IOPMLib.h>
#include <IOKit/pwr_mgt/IOPM.h>
struct ref_with_ret {
CFDictionaryRef ref;
IOReturn ret;
};
struct ref_with_ret FetchThermal();
struct ref_with_ret FetchThermal() {
CFDictionaryRef ref;
IOReturn ret;
ret = IOPMCopyCPUPowerStatus(&ref);
struct ref_with_ret result = {
ref,
ret,
};
return result;
}
*/
import "C"
import (
"errors"
"fmt"
"log/slog"
"unsafe"
"github.com/prometheus/client_golang/prometheus"
)
type thermCollector struct {
cpuSchedulerLimit typedDesc
cpuAvailableCPU typedDesc
cpuSpeedLimit typedDesc
logger *slog.Logger
}
const thermal = "thermal"
func init() {
registerCollector(thermal, defaultEnabled, NewThermCollector)
}
// NewThermCollector returns a new Collector exposing current CPU power levels.
func NewThermCollector(logger *slog.Logger) (Collector, error) {
return &thermCollector{
cpuSchedulerLimit: typedDesc{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, thermal, "cpu_scheduler_limit_ratio"),
"Represents the percentage (0-100) of CPU time available. 100% at normal operation. The OS may limit this time for a percentage less than 100%.",
nil,
nil),
valueType: prometheus.GaugeValue,
},
cpuAvailableCPU: typedDesc{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, thermal, "cpu_available_cpu"),
"Reflects how many, if any, CPUs have been taken offline. Represented as an integer number of CPUs (0 - Max CPUs).",
nil,
nil,
),
valueType: prometheus.GaugeValue,
},
cpuSpeedLimit: typedDesc{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, thermal, "cpu_speed_limit_ratio"),
"Defines the speed & voltage limits placed on the CPU. Represented as a percentage (0-100) of maximum CPU speed.",
nil,
nil,
),
valueType: prometheus.GaugeValue,
},
logger: logger,
}, nil
}
func (c *thermCollector) Update(ch chan<- prometheus.Metric) error {
cpuPowerStatus, err := fetchCPUPowerStatus()
if err != nil {
return err
}
if value, ok := cpuPowerStatus[(string(C.kIOPMCPUPowerLimitSchedulerTimeKey))]; ok {
ch <- c.cpuSchedulerLimit.mustNewConstMetric(float64(value) / 100.0)
}
if value, ok := cpuPowerStatus[(string(C.kIOPMCPUPowerLimitProcessorCountKey))]; ok {
ch <- c.cpuAvailableCPU.mustNewConstMetric(float64(value))
}
if value, ok := cpuPowerStatus[(string(C.kIOPMCPUPowerLimitProcessorSpeedKey))]; ok {
ch <- c.cpuSpeedLimit.mustNewConstMetric(float64(value) / 100.0)
}
return nil
}
func fetchCPUPowerStatus() (map[string]int, error) {
cfDictRef, _ := C.FetchThermal()
defer func() {
if cfDictRef.ref != 0x0 {
C.CFRelease(C.CFTypeRef(cfDictRef.ref))
}
}()
if C.kIOReturnNotFound == cfDictRef.ret {
return nil, errors.New("no CPU power status has been recorded")
}
if C.kIOReturnSuccess != cfDictRef.ret {
return nil, fmt.Errorf("no CPU power status with error code 0x%08x", int(cfDictRef.ret))
}
// mapping CFDictionary to map
cfDict := CFDict(cfDictRef.ref)
return mappingCFDictToMap(cfDict), nil
}
type CFDict uintptr
func mappingCFDictToMap(dict CFDict) map[string]int {
if C.CFNullRef(dict) == C.kCFNull {
return nil
}
cfDict := C.CFDictionaryRef(dict)
var result map[string]int
count := C.CFDictionaryGetCount(cfDict)
if count > 0 {
keys := make([]C.CFTypeRef, count)
values := make([]C.CFTypeRef, count)
C.CFDictionaryGetKeysAndValues(cfDict, (*unsafe.Pointer)(unsafe.Pointer(&keys[0])), (*unsafe.Pointer)(unsafe.Pointer(&values[0])))
result = make(map[string]int, count)
for i := C.CFIndex(0); i < count; i++ {
result[mappingCFStringToString(C.CFStringRef(keys[i]))] = mappingCFNumberLongToInt(C.CFNumberRef(values[i]))
}
}
return result
}
// CFStringToString converts a CFStringRef to a string.
func mappingCFStringToString(s C.CFStringRef) string {
p := C.CFStringGetCStringPtr(s, C.kCFStringEncodingUTF8)
if p != nil {
return C.GoString(p)
}
length := C.CFStringGetLength(s)
if length == 0 {
return ""
}
maxBufLen := C.CFStringGetMaximumSizeForEncoding(length, C.kCFStringEncodingUTF8)
if maxBufLen == 0 {
return ""
}
buf := make([]byte, maxBufLen)
var usedBufLen C.CFIndex
_ = C.CFStringGetBytes(s, C.CFRange{0, length}, C.kCFStringEncodingUTF8, C.UInt8(0), C.false, (*C.UInt8)(&buf[0]), maxBufLen, &usedBufLen)
return string(buf[:usedBufLen])
}
func mappingCFNumberLongToInt(n C.CFNumberRef) int {
typ := C.CFNumberGetType(n)
var long C.long
C.CFNumberGetValue(n, typ, unsafe.Pointer(&long))
return int(long)
}
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