87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
// Copyright 2017 AMIS Technologies
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package k8s
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import (
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"os"
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"path/filepath"
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"sync"
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"time"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/tools/clientcmd"
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)
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const (
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defaultNamespace = "default"
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healthCheckRetryCount = 5
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healthCheckRetryDelay = 5 * time.Second
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)
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func k8sClient(podName string) *kubernetes.Clientset {
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config, err := clientcmd.BuildConfigFromFlags("", filepath.Join(os.Getenv("HOME"), ".kube", "config"))
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if err != nil {
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log.Error("Failed to create Kubernetes config", "err", err)
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return nil
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}
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for i := 0; i < healthCheckRetryCount; i++ {
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client, err := kubernetes.NewForConfig(config)
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if err != nil {
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log.Error("Failed to create Kubernetes client from config", "config", config, "err", err)
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<-time.After(healthCheckRetryDelay)
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continue
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}
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_, err = client.CoreV1().Pods(defaultNamespace).Get(podName, metav1.GetOptions{})
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if err != nil {
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log.Error("Failed to get pod", "namespace", defaultNamespace, "pod", podName, "err", err)
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<-time.After(healthCheckRetryDelay)
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continue
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} else {
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return client
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}
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}
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log.Error("Failed to retrieve kubernetes client")
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return nil
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}
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func executeInParallel(fns ...func() error) error {
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var wg sync.WaitGroup
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errc := make(chan error, len(fns))
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wg.Add(len(fns))
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for _, fn := range fns {
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fn := fn
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go func() {
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defer wg.Done()
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errc <- fn()
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}()
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}
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// Wait for the first error, then terminate the others.
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var err error
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for i := 0; i < len(fns); i++ {
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if err = <-errc; err != nil {
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return err
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}
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}
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wg.Wait()
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return err
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}
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