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jobrunner.go
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jobrunner.go
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package k8s
import (
"fmt"
"sync"
batchv1 "k8s.io/api/batch/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/watch"
)
// JobRunner will launch a Job and monitor it for completion.
type JobRunner interface {
Run(*batchv1.Job) error
}
// CreateJobRunner will create a JobRunner, or return an error.
func CreateJobRunner(kube Clients) JobRunner {
return &jobRunner{
kube: kube,
}
}
type jobRunner struct {
kube Clients
}
type task struct {
errs chan<- error
ready chan<- bool
wg *sync.WaitGroup
}
func (j *jobRunner) Run(job *batchv1.Job) error {
ready := make(chan bool)
errs := make(chan error)
tsk := task{
errs, ready, &sync.WaitGroup{},
}
tasks := []func(*batchv1.Job, task){
// wait is started first, making sure to capture success, even the ultra-fast one.
j.waitForSuccess,
j.createJob,
}
tsk.wg.Add(len(tasks))
// run all tasks in parallel
for _, fn := range tasks {
go fn(job, tsk)
<-ready
}
go waitAndClose(tsk)
// return the first error
for err := range errs {
if err != nil {
return err
}
}
return j.deleteJob(job)
}
func (j *jobRunner) createJob(job *batchv1.Job, tsk task) {
defer tsk.wg.Done()
tsk.ready <- true
ctx := j.kube.Context()
jobs := j.kube.Typed().BatchV1().Jobs(job.Namespace)
_, err := jobs.Create(ctx, job, metav1.CreateOptions{})
if err != nil {
tsk.errs <- fmt.Errorf("%w: %v", ErrICSenderJobFailed, err)
}
}
func (j *jobRunner) waitForSuccess(job *batchv1.Job, tsk task) {
defer tsk.wg.Done()
err := j.watchJob(job, tsk, func(job *batchv1.Job) (bool, error) {
if job.Status.CompletionTime == nil && job.Status.Failed == 0 {
return false, nil
}
// We should be done if we reach here.
if job.Status.Succeeded < 1 {
return false, fmt.Errorf("%w: %s", ErrICSenderJobFailed,
"expected to have successful job")
}
return true, nil
})
if err != nil {
tsk.errs <- fmt.Errorf("%w: %v", ErrICSenderJobFailed, err)
}
}
func waitAndClose(tsk task) {
tsk.wg.Wait()
close(tsk.errs)
}
func (j *jobRunner) deleteJob(job *batchv1.Job) error {
ctx := j.kube.Context()
jobs := j.kube.Typed().BatchV1().Jobs(job.GetNamespace())
err := jobs.Delete(ctx, job.GetName(), metav1.DeleteOptions{})
if err != nil {
return fmt.Errorf("%w: %v", ErrICSenderJobFailed, err)
}
pods := j.kube.Typed().CoreV1().Pods(job.GetNamespace())
err = pods.DeleteCollection(ctx, metav1.DeleteOptions{}, metav1.ListOptions{
LabelSelector: fmt.Sprintf("job-name=%s", job.GetName()),
})
if err != nil {
return fmt.Errorf("%w: %v", ErrICSenderJobFailed, err)
}
return nil
}
func (j *jobRunner) watchJob(obj metav1.Object, tsk task, changeFn func(job *batchv1.Job) (bool, error)) error {
ctx := j.kube.Context()
jobs := j.kube.Typed().BatchV1().Jobs(obj.GetNamespace())
watcher, err := jobs.Watch(ctx, metav1.ListOptions{
FieldSelector: fmt.Sprintf("metadata.name=%s", obj.GetName()),
})
if err != nil {
return fmt.Errorf("%w: %v", ErrICSenderJobFailed, err)
}
defer watcher.Stop()
resultCh := watcher.ResultChan()
tsk.ready <- true
for result := range resultCh {
if result.Type == watch.Added || result.Type == watch.Modified {
job, ok := result.Object.(*batchv1.Job)
if !ok {
return fmt.Errorf("%w: %s: %T", ErrICSenderJobFailed,
"expected to watch batchv1.Job, got", result.Object)
}
var brk bool
brk, err = changeFn(job)
if err != nil {
return fmt.Errorf("%w: %v", ErrICSenderJobFailed, err)
}
if brk {
return nil
}
}
}
return nil
}