github.com/GoogleContainerTools/skaffold@v1.39.18/pkg/skaffold/build/cluster/logs.go (about)

     1  /*
     2  Copyright 2019 The Skaffold Authors
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package cluster
    18  
    19  import (
    20  	"bufio"
    21  	"context"
    22  	"fmt"
    23  	"io"
    24  	"sync"
    25  	"sync/atomic"
    26  	"time"
    27  
    28  	v1 "k8s.io/api/core/v1"
    29  	corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
    30  
    31  	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/build/kaniko"
    32  	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/output/log"
    33  )
    34  
    35  func streamLogs(ctx context.Context, out io.Writer, name string, pods corev1.PodInterface) func() {
    36  	var wg sync.WaitGroup
    37  	wg.Add(1)
    38  
    39  	var written int64
    40  	var retry int32 = 1
    41  	go func() {
    42  		defer wg.Done()
    43  
    44  		for atomic.LoadInt32(&retry) == 1 {
    45  			r, err := pods.GetLogs(name, &v1.PodLogOptions{
    46  				Follow:    true,
    47  				Container: kaniko.DefaultContainerName,
    48  			}).Stream(ctx)
    49  			if err != nil {
    50  				log.Entry(ctx).Debug("unable to get kaniko pod logs:", err)
    51  				time.Sleep(1 * time.Second)
    52  				continue
    53  			}
    54  
    55  			scanner := bufio.NewScanner(r)
    56  			for {
    57  				select {
    58  				case <-ctx.Done():
    59  					return // The build was cancelled
    60  				default:
    61  					if !scanner.Scan() {
    62  						return // No more logs
    63  					}
    64  
    65  					fmt.Fprintln(out, scanner.Text())
    66  					atomic.AddInt64(&written, 1)
    67  				}
    68  			}
    69  		}
    70  	}()
    71  
    72  	return func() {
    73  		atomic.StoreInt32(&retry, 0)
    74  		wg.Wait()
    75  
    76  		// get latest logs if pod was terminated before logs have been streamed
    77  		if atomic.LoadInt64(&written) == 0 {
    78  			r, err := pods.GetLogs(name, &v1.PodLogOptions{
    79  				Container: kaniko.DefaultContainerName,
    80  			}).Stream(ctx)
    81  			if err == nil {
    82  				io.Copy(out, r)
    83  			}
    84  		}
    85  	}
    86  }