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exporter.go
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/
exporter.go
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package exporter
import (
"context"
"fmt"
"sync/atomic"
"time"
"github.com/sirupsen/logrus"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"github.com/castai/gpu-metrics-exporter/internal/castai"
)
type Exporter interface {
Start(ctx context.Context) error
Enable()
Disable()
Enabled() bool
}
type Config struct {
ExportInterval time.Duration
DCGMExporterPort int
DCGMExporterPath string
DCGMExporterHost string
Selector string
Enabled bool
}
type exporter struct {
cfg Config
kube kubernetes.Interface
log logrus.FieldLogger
scraper Scraper
mapper MetricMapper
enabled *atomic.Bool
client castai.Client
}
func NewExporter(
cfg Config,
kube kubernetes.Interface,
log logrus.FieldLogger,
scraper Scraper,
mapper MetricMapper,
castaiClient castai.Client,
) Exporter {
enabled := atomic.Bool{}
enabled.Store(cfg.Enabled)
return &exporter{
cfg: cfg,
kube: kube,
log: log,
scraper: scraper,
mapper: mapper,
enabled: &enabled,
client: castaiClient,
}
}
func (e *exporter) Start(ctx context.Context) error {
exportTicker := time.NewTicker(e.cfg.ExportInterval)
defer exportTicker.Stop()
for {
select {
case <-ctx.Done():
return ctx.Err()
case <-exportTicker.C:
if !e.enabled.Load() {
continue
}
if err := e.export(ctx); err != nil {
e.log.Errorf("export error: %v", err)
}
}
}
}
func (e *exporter) Enable() {
e.enabled.Store(true)
}
func (e *exporter) Disable() {
e.enabled.Store(false)
}
func (e *exporter) Enabled() bool {
return e.enabled.Load()
}
func (e *exporter) getDCGMUrls(ctx context.Context) ([]string, error) {
if e.cfg.DCGMExporterHost != "" {
// we are scraping a single host, no need to check for other pods
return []string{
fmt.Sprintf("http://%s:%d%s", e.cfg.DCGMExporterHost, e.cfg.DCGMExporterPort, e.cfg.DCGMExporterPath),
}, nil
}
// TODO: consider using an informer and keeping a list of pods which match the selector
// at the moment seems like an overkill
dcgmExporterList, err := e.kube.CoreV1().Pods("").List(ctx, metav1.ListOptions{
LabelSelector: e.cfg.Selector,
FieldSelector: "status.phase=Running",
})
if err != nil {
return []string{}, fmt.Errorf("error getting DCGM exporter pods %w", err)
}
urls := make([]string, len(dcgmExporterList.Items))
for i := range dcgmExporterList.Items {
dcgmExporter := dcgmExporterList.Items[i]
urls[i] = fmt.Sprintf("http://%s:%d%s", dcgmExporter.Status.PodIP, e.cfg.DCGMExporterPort, e.cfg.DCGMExporterPath)
}
return urls, nil
}
func (e *exporter) export(ctx context.Context) error {
urls, err := e.getDCGMUrls(ctx)
if err != nil {
return err
}
if len(urls) == 0 {
e.log.Info("no dcgm-exporter instances to scrape")
return nil
}
metricFamilies, err := e.scraper.Scrape(ctx, urls)
if err != nil {
return fmt.Errorf("couldn't scrape DCGM exporters %w", err)
}
if len(metricFamilies) == 0 {
e.log.Warnf("no metrics collected from %d dcgm-exporters", len(urls))
return nil
}
batch := e.mapper.Map(metricFamilies)
if err := e.client.UploadBatch(ctx, batch); err != nil {
return fmt.Errorf("error whlie sending %d metrics to castai %w", len(batch.Metrics), err)
}
e.log.Infof("successfully exported %d metrics", len(batch.Metrics))
return nil
}