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cache.ListWatchUntil should return err.ErrWaitTimeout 

Clients shouldn't have to know about watch.ErrWatchClosed, which is
typically a server side decision to close and always means "Timeout" in
this conetxt.
pull/6/head
Clayton Coleman 2017-10-05 18:51:57 -04:00
parent 7555dec82e
commit cbecf17727
No known key found for this signature in database
GPG Key ID: 3D16906B4F1C5CB3
2 changed files with 13 additions and 1 deletions
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4
pkg/kubelet/util/csr/csr.go
View File

@ -33,6 +33,7 @@ import (
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apimachinery/pkg/watch"
certificatesclient "k8s.io/client-go/kubernetes/typed/certificates/v1beta1"
"k8s.io/client-go/tools/cache"
@ -147,6 +148,9 @@ func RequestCertificate(client certificatesclient.CertificateSigningRequestInter
return false, nil
},
)
if err == wait.ErrWaitTimeout {
return nil, wait.ErrWaitTimeout
}
if err != nil {
return nil, fmt.Errorf("cannot watch on the certificate signing request: %v", err)
}

10
staging/src/k8s.io/client-go/tools/cache/listwatch.go vendored
View File

@ -25,6 +25,7 @@ import (
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apimachinery/pkg/watch"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/tools/pager"
@ -103,6 +104,8 @@ func (lw *ListWatch) Watch(options metav1.ListOptions) (watch.Interface, error)
return lw.WatchFunc(options)
}
// ListWatchUntil checks the provided conditions against the items returned by the list watcher, returning wait.ErrWaitTimeout
// if timeout is exceeded without all conditions returning true, or an error if an error occurs.
// TODO: check for watch expired error and retry watch from latest point? Same issue exists for Until.
func ListWatchUntil(timeout time.Duration, lw ListerWatcher, conditions ...watch.ConditionFunc) (*watch.Event, error) {
if len(conditions) == 0 {
@ -166,5 +169,10 @@ func ListWatchUntil(timeout time.Duration, lw ListerWatcher, conditions ...watch
return nil, err
}
return watch.Until(timeout, watchInterface, remainingConditions...)
evt, err := watch.Until(timeout, watchInterface, remainingConditions...)
if err == watch.ErrWatchClosed {
// present a consistent error interface to callers
err = wait.ErrWaitTimeout
}
return evt, err
}