90 lines
2.3 KiB
Go
90 lines
2.3 KiB
Go
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package collector
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import (
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"fmt"
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"reflect"
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perflibCollector "github.com/leoluk/perflib_exporter/collector"
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"github.com/leoluk/perflib_exporter/perflib"
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"github.com/prometheus/common/log"
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)
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func getPerflibSnapshot() (map[string]*perflib.PerfObject, error) {
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objects, err := perflib.QueryPerformanceData("Global")
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if err != nil {
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return nil, err
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}
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indexed := make(map[string]*perflib.PerfObject)
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for _, obj := range objects {
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indexed[obj.Name] = obj
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}
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return indexed, nil
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}
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func unmarshalObject(obj *perflib.PerfObject, vs interface{}) error {
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if obj == nil {
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return fmt.Errorf("counter not found")
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}
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rv := reflect.ValueOf(vs)
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if rv.Kind() != reflect.Ptr || rv.IsNil() {
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return fmt.Errorf("%v is nil or not a pointer to slice", reflect.TypeOf(vs))
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}
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ev := rv.Elem()
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if ev.Kind() != reflect.Slice {
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return fmt.Errorf("%v is not slice", reflect.TypeOf(vs))
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}
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// Ensure sufficient length
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if ev.Cap() < len(obj.Instances) {
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nvs := reflect.MakeSlice(ev.Type(), len(obj.Instances), len(obj.Instances))
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ev.Set(nvs)
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}
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for idx, instance := range obj.Instances {
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target := ev.Index(idx)
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rt := target.Type()
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counters := make(map[string]*perflib.PerfCounter, len(instance.Counters))
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for _, ctr := range instance.Counters {
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if ctr.Def.IsBaseValue && !ctr.Def.IsNanosecondCounter {
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counters[ctr.Def.Name+"_Base"] = ctr
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} else {
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counters[ctr.Def.Name] = ctr
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}
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}
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for i := 0; i < target.NumField(); i++ {
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f := rt.Field(i)
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tag := f.Tag.Get("perflib")
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if tag == "" {
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continue
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}
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ctr, found := counters[tag]
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if !found {
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log.Debugf("missing counter %q, has %v", tag, counters)
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return fmt.Errorf("could not find counter %q on instance", tag)
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}
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if !target.Field(i).CanSet() {
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return fmt.Errorf("tagged field %v cannot be written to", f)
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}
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switch ctr.Def.CounterType {
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case perflibCollector.PERF_ELAPSED_TIME:
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target.Field(i).SetFloat(float64(ctr.Value-windowsEpoch) / float64(obj.Frequency))
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case perflibCollector.PERF_100NSEC_TIMER, perflibCollector.PERF_PRECISION_100NS_TIMER:
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target.Field(i).SetFloat(float64(ctr.Value) * ticksToSecondsScaleFactor)
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default:
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target.Field(i).SetFloat(float64(ctr.Value))
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}
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}
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if instance.Name != "" && target.FieldByName("Name").CanSet() {
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target.FieldByName("Name").SetString(instance.Name)
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}
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}
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return nil
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}
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