/
stream.go
71 lines (57 loc) · 1.48 KB
/
stream.go
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package main
import (
"GetPodLogsEfficiently/client"
"bufio"
"context"
"fmt"
"time"
"github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
const (
Namespace = "default"
LabelSelector = "app=logsdemo"
)
var Client *client.Set
func GetPodLogs(podName string) error {
k8session := client.New("")
podLogOpts := corev1.PodLogOptions{}
podLogOpts.Follow = true
tailLines := int64(100)
podLogOpts.TailLines = &tailLines // get 100 last lines
podLogs, err := k8session.CoreV1Interface.Pods(
Namespace).GetLogs(podName, &podLogOpts).Stream(context.Background())
if err != nil {
return fmt.Errorf("failed to get logs for pod: %v due to: %w", podName, err)
}
defer podLogs.Close()
for i := 0; i < 10; i++ {
reader := bufio.NewScanner(podLogs)
for reader.Scan() {
line := reader.Text()
logrus.Printf("Pod: %v line: %v\n", podName, line)
}
time.Sleep(1 * time.Millisecond)
if reader.Err() != nil {
return fmt.Errorf("caught an error while processing logs due to: %w", reader.Err())
}
}
return nil
}
func main() {
Client = client.New("")
pods, err := Client.Pods(Namespace).List(context.Background(), metav1.ListOptions{
LabelSelector: LabelSelector})
if err != nil {
logrus.Errorf("Failed to get demo pod from cluster %v", client.Client.Config.Host)
return
}
for _, pod := range pods.Items {
logrus.Println(pod.Name)
err := GetPodLogs(pod.Name)
if err != nil {
logrus.Println(err)
}
}
}