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logs.go
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logs.go
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/*
Copyright 2021 The Flux authors
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 main
import (
"bufio"
"context"
"encoding/json"
"fmt"
"html/template"
"io"
"os"
"strings"
"sync"
"github.com/spf13/cobra"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"github.com/fluxcd/flux2/internal/flags"
"github.com/fluxcd/flux2/internal/utils"
)
var logsCmd = &cobra.Command{
Use: "logs",
Short: "Display formatted logs for Flux components",
Long: "The logs command displays formatted logs from various Flux components.",
Example: ` # Print the reconciliation logs of all Flux custom resources in your cluster
flux logs --all-namespaces
# Stream logs for a particular log level
flux logs --follow --level=error --all-namespaces
# Filter logs by kind, name and namespace
flux logs --kind=Kustomization --name=podinfo --namespace=default
# Print logs when Flux is installed in a different namespace than flux-system
flux logs --flux-namespace=my-namespace
`,
RunE: logsCmdRun,
}
type logsFlags struct {
logLevel flags.LogLevel
follow bool
tail int64
kind string
name string
fluxNamespace string
allNamespaces bool
}
var logsArgs = &logsFlags{
tail: -1,
}
func init() {
logsCmd.Flags().Var(&logsArgs.logLevel, "level", logsArgs.logLevel.Description())
logsCmd.Flags().StringVarP(&logsArgs.kind, "kind", "", logsArgs.kind, "displays errors of a particular toolkit kind e.g GitRepository")
logsCmd.Flags().StringVarP(&logsArgs.name, "name", "", logsArgs.name, "specifies the name of the object logs to be displayed")
logsCmd.Flags().BoolVarP(&logsArgs.follow, "follow", "f", logsArgs.follow, "specifies if the logs should be streamed")
logsCmd.Flags().Int64VarP(&logsArgs.tail, "tail", "", logsArgs.tail, "lines of recent log file to display")
logsCmd.Flags().StringVarP(&logsArgs.fluxNamespace, "flux-namespace", "", rootArgs.defaults.Namespace, "the namespace where the Flux components are running")
logsCmd.Flags().BoolVarP(&logsArgs.allNamespaces, "all-namespaces", "A", false, "displays logs for objects across all namespaces")
rootCmd.AddCommand(logsCmd)
}
func logsCmdRun(cmd *cobra.Command, args []string) error {
fluxSelector := fmt.Sprintf("app.kubernetes.io/instance=%s", logsArgs.fluxNamespace)
ctx, cancel := context.WithTimeout(context.Background(), rootArgs.timeout)
defer cancel()
var pods []corev1.Pod
cfg, err := utils.KubeConfig(rootArgs.kubeconfig, rootArgs.kubecontext)
if err != nil {
return err
}
clientset, err := kubernetes.NewForConfig(cfg)
if err != nil {
return err
}
if len(args) > 0 {
return fmt.Errorf("no argument required")
}
pods, err = getPods(ctx, clientset, fluxSelector)
if err != nil {
return err
}
logOpts := &corev1.PodLogOptions{
Follow: logsArgs.follow,
}
if logsArgs.tail > -1 {
logOpts.TailLines = &logsArgs.tail
}
var requests []rest.ResponseWrapper
for _, pod := range pods {
req := clientset.CoreV1().Pods(logsArgs.fluxNamespace).GetLogs(pod.Name, logOpts)
requests = append(requests, req)
}
if logsArgs.follow && len(requests) > 1 {
return parallelPodLogs(ctx, requests)
}
return podLogs(ctx, requests)
}
func getPods(ctx context.Context, c *kubernetes.Clientset, label string) ([]corev1.Pod, error) {
var ret []corev1.Pod
opts := metav1.ListOptions{
LabelSelector: label,
}
deployList, err := c.AppsV1().Deployments(logsArgs.fluxNamespace).List(ctx, opts)
if err != nil {
return ret, err
}
for _, deploy := range deployList.Items {
label := deploy.Spec.Template.Labels
opts := metav1.ListOptions{
LabelSelector: createLabelStringFromMap(label),
}
podList, err := c.CoreV1().Pods(logsArgs.fluxNamespace).List(ctx, opts)
if err != nil {
return ret, err
}
ret = append(ret, podList.Items...)
}
return ret, nil
}
func parallelPodLogs(ctx context.Context, requests []rest.ResponseWrapper) error {
reader, writer := io.Pipe()
wg := &sync.WaitGroup{}
wg.Add(len(requests))
var mutex = &sync.Mutex{}
for _, request := range requests {
go func(req rest.ResponseWrapper) {
defer wg.Done()
if err := logRequest(mutex, ctx, req, os.Stdout); err != nil {
writer.CloseWithError(err)
return
}
}(request)
}
go func() {
wg.Wait()
writer.Close()
}()
_, err := io.Copy(os.Stdout, reader)
return err
}
func podLogs(ctx context.Context, requests []rest.ResponseWrapper) error {
mutex := &sync.Mutex{}
for _, req := range requests {
if err := logRequest(mutex, ctx, req, os.Stdout); err != nil {
return err
}
}
return nil
}
func createLabelStringFromMap(m map[string]string) string {
var strArr []string
for key, val := range m {
pair := fmt.Sprintf("%v=%v", key, val)
strArr = append(strArr, pair)
}
return strings.Join(strArr, ",")
}
func logRequest(mu *sync.Mutex, ctx context.Context, request rest.ResponseWrapper, w io.Writer) error {
stream, err := request.Stream(ctx)
if err != nil {
return err
}
defer stream.Close()
scanner := bufio.NewScanner(stream)
const logTmpl = "{{.Timestamp}} {{.Level}} {{.Kind}}{{if .Name}}/{{.Name}}.{{.Namespace}}{{end}} - {{.Message}} {{.Error}}\n"
t, err := template.New("log").Parse(logTmpl)
if err != nil {
return fmt.Errorf("unable to create template, err: %s", err)
}
for scanner.Scan() {
line := scanner.Text()
if !strings.HasPrefix(line, "{") {
continue
}
var l ControllerLogEntry
if err := json.Unmarshal([]byte(line), &l); err != nil {
logger.Failuref("parse error: %s", err)
break
}
mu.Lock()
filterPrintLog(t, &l)
mu.Unlock()
}
return nil
}
func filterPrintLog(t *template.Template, l *ControllerLogEntry) {
if logsArgs.logLevel != "" && logsArgs.logLevel != l.Level ||
logsArgs.kind != "" && strings.ToLower(logsArgs.kind) != strings.ToLower(l.Kind) ||
logsArgs.name != "" && strings.ToLower(logsArgs.name) != strings.ToLower(l.Name) ||
!logsArgs.allNamespaces && strings.ToLower(rootArgs.namespace) != strings.ToLower(l.Namespace) {
return
}
err := t.Execute(os.Stdout, l)
if err != nil {
logger.Failuref("log template error: %s", err)
}
}
type ControllerLogEntry struct {
Timestamp string `json:"ts"`
Level flags.LogLevel `json:"level"`
Message string `json:"msg"`
Error string `json:"error,omitempty"`
Logger string `json:"logger"`
Kind string `json:"reconciler kind,omitempty"`
Name string `json:"name,omitempty"`
Namespace string `json:"namespace,omitempty"`
}