/
scraper.go
99 lines (81 loc) · 2.05 KB
/
scraper.go
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package joblogger
import (
"bytes"
"context"
"fmt"
"io"
"sync"
"time"
pkgerrors "github.com/pkg/errors"
v1 "k8s.io/api/core/v1"
"k8s.io/client-go/kubernetes"
)
func (srv *JobLogger) runScraper(ctx context.Context) error {
ticker := time.NewTicker(srv.interval)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return ctx.Err()
case <-ticker.C:
wg := sync.WaitGroup{}
srv.podMap.Range(srv.iterate(ctx, &wg))
wg.Wait()
}
}
}
func (srv *JobLogger) iterate(ctx context.Context, wg *sync.WaitGroup) func(k, v interface{}) bool {
return func(k, v interface{}) bool {
wg.Add(1)
defer wg.Done()
info, ok := v.(*podInfo)
if !ok {
_, _ = fmt.Fprintf(srv.out, "invalid value for key: %s\n", k)
return true
}
if info.hasStarted() && !info.Scraped {
go func() {
err := srv.scrape(ctx, wg, info)
if err != nil {
_, _ = fmt.Fprintf(srv.out, "%v\n", err)
}
}()
}
return true
}
}
func (srv *JobLogger) scrape(ctx context.Context, wg *sync.WaitGroup, info *podInfo) error {
wg.Add(1)
defer wg.Done()
clientset := srv.clientsets[info.Kubectx]
logs, err := srv.getLogs(ctx, clientset, info.Name)
if err != nil {
return pkgerrors.WithMessagef(err, "error fetching logs for pod %s in kubectx %s: %v", info.Name, info.Kubectx, err)
}
info.appendLog(logs)
if info.hasCompleted() {
info.Scraped = true
}
return nil
}
func (srv *JobLogger) getLogs(ctx context.Context, clientset *kubernetes.Clientset, pod string) (*bytes.Buffer, error) {
podLogOpts := v1.PodLogOptions{}
stream, err := clientset.CoreV1().Pods(srv.namespace).GetLogs(pod, &podLogOpts).Stream(ctx)
if err != nil {
return nil, pkgerrors.WithMessage(err, "error getting log stream from Kubernetes API")
}
logs, err := read(stream)
if err != nil {
return nil, pkgerrors.WithMessage(err, "error reading log stream")
}
return logs, nil
}
func read(stream io.ReadCloser) (*bytes.Buffer, error) {
defer stream.Close()
buf := new(bytes.Buffer)
_, err := io.Copy(buf, stream)
if err != nil {
return nil, err
}
return buf, nil
}