70 lines
1.9 KiB
Go
70 lines
1.9 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package startups
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import (
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"fmt"
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"time"
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"k8s.io/kubernetes/pkg/kubelet/apis/kubeletconfig/validation"
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)
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const (
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// we allow one extra startup to account for the startup necessary to update configuration
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maxStartups = validation.MaxCrashLoopThreshold + 1
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)
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// Tracker tracks Kubelet startups in a storage layer
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type Tracker interface {
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// Initialize sets up the storage layer
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Initialize() error
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// RecordStartup records the current time as a Kubelet startup
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RecordStartup() error
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// StartupsSince returns the number of Kubelet startus recorded since `t`
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StartupsSince(t time.Time) (int32, error)
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}
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func startupsSince(ls []string, start time.Time) (int32, error) {
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// since the list is append-only we only need to count the number of timestamps since `t`
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startups := int32(0)
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for _, stamp := range ls {
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t, err := time.Parse(time.RFC3339, stamp)
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if err != nil {
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return 0, fmt.Errorf("failed to parse timestamp while counting startups, error: %v", err)
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}
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if t.After(start) {
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startups++
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}
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}
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return startups, nil
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}
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func recordStartup(ls []string) []string {
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// record current time
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now := time.Now()
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stamp := now.Format(time.RFC3339) // use RFC3339 time format
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ls = append(ls, stamp)
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// rotate the slice if necessary
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if len(ls) > maxStartups {
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ls = ls[1:]
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}
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// return the new slice
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return ls
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}
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