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Add --no-follow flag to exit when all logs have been shown (#204)
* Extract filtering logic to targetFilter * Add --no-follow flag to exit when all logs have been shown
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| // Copyright 2017 Wercker Holding BV | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package stern | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "regexp" | ||
|
|
||
| corev1 "k8s.io/api/core/v1" | ||
| ) | ||
|
|
||
| // Target is a target to watch | ||
| type Target struct { | ||
| Node string | ||
| Namespace string | ||
| Pod string | ||
| Container string | ||
| } | ||
|
|
||
| // GetID returns the ID of the object | ||
| func (t *Target) GetID() string { | ||
| return fmt.Sprintf("%s-%s-%s", t.Namespace, t.Pod, t.Container) | ||
| } | ||
|
|
||
| // targetFilter is a filter of Target | ||
| type targetFilter struct { | ||
| podFilter *regexp.Regexp | ||
| excludePodFilter *regexp.Regexp | ||
| containerFilter *regexp.Regexp | ||
| containerExcludeFilter *regexp.Regexp | ||
| initContainers bool | ||
| ephemeralContainers bool | ||
| containerStates []ContainerState | ||
| } | ||
|
|
||
| // visit passes filtered Targets to the visitor function | ||
| func (f *targetFilter) visit(pod *corev1.Pod, visitor func(t *Target, containerStateMatched bool)) { | ||
| // filter by pod | ||
| if !f.podFilter.MatchString(pod.Name) { | ||
| return | ||
| } | ||
| if f.excludePodFilter != nil && f.excludePodFilter.MatchString(pod.Name) { | ||
| return | ||
| } | ||
|
|
||
| // filter by container statuses | ||
| var statuses []corev1.ContainerStatus | ||
| statuses = append(statuses, pod.Status.ContainerStatuses...) | ||
| if f.initContainers { | ||
| statuses = append(statuses, pod.Status.InitContainerStatuses...) | ||
| } | ||
| if f.ephemeralContainers { | ||
| statuses = append(statuses, pod.Status.EphemeralContainerStatuses...) | ||
| } | ||
| for _, c := range statuses { | ||
| if !f.containerFilter.MatchString(c.Name) { | ||
| continue | ||
| } | ||
| if f.containerExcludeFilter != nil && f.containerExcludeFilter.MatchString(c.Name) { | ||
| continue | ||
| } | ||
| t := &Target{ | ||
| Node: pod.Spec.NodeName, | ||
| Namespace: pod.Namespace, | ||
| Pod: pod.Name, | ||
| Container: c.Name, | ||
| } | ||
| visitor(t, f.matchContainerState(c.State)) | ||
| } | ||
| } | ||
|
|
||
| func (f *targetFilter) matchContainerState(state corev1.ContainerState) bool { | ||
| for _, containerState := range f.containerStates { | ||
| if containerState.Match(state) { | ||
| return true | ||
| } | ||
| } | ||
| return false | ||
| } |
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