initial commit

2019-11-23 15:01:39 +00:00 · 2019-11-23 15:01:39 +00:00 · eab7ebe7ff
commit eab7ebe7ff
6 changed files with 253 additions and 0 deletions
--- a/12
+++ b/12
@ -0,0 +1,12 @@
+Copyright (c) 2019 Christine Dodrill <me@christine.website>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.
--- a/go.mod
+++ b/go.mod
@ -0,0 +1,10 @@
+module tulpa.dev/within/lumber
+
+go 1.13
+
+require (
+	golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e // indirect
+	k8s.io/api v0.0.0-20190819141258-3544db3b9e44
+	k8s.io/apimachinery v0.0.0-20190817020851-f2f3a405f61d
+	k8s.io/client-go v0.0.0-20190819141724-e14f31a72a77
+)
--- a/go.sum
+++ b/go.sum
@ -0,0 +1,91 @@
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/Azure/go-autorest v11.1.2+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dgrijalva/jwt-go v0.0.0-20160705203006-01aeca54ebda/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
+github.com/docker/spdystream v0.0.0-20160310174837-449fdfce4d96/go.mod h1:Qh8CwZgvJUkLughtfhJv5dyTYa91l1fOUCrgjqmcifM=
+github.com/elazarl/goproxy v0.0.0-20170405201442-c4fc26588b6e/go.mod h1:/Zj4wYkgs4iZTTu3o/KG3Itv/qCCa8VVMlb3i9OVuzc=
+github.com/evanphx/json-patch v0.0.0-20190203023257-5858425f7550/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk=
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+github.com/gogo/protobuf v0.0.0-20171007142547-342cbe0a0415/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
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+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
--- a/linesplitwriter.go
+++ b/linesplitwriter.go
@ -0,0 +1,25 @@
+package main
+
+import (
+	"bytes"
+	"io"
+)
+
+type lineSplittingWriter struct {
+	writer io.Writer
+}
+
+func (lsw lineSplittingWriter) Write(p []byte) (int, error) {
+	for _, line := range bytes.Split(p, []byte("\n")) {
+		if len(line) == 0 {
+			continue
+		}
+
+		_, err := lsw.writer.Write(append(line, '\n'))
+		if err != nil {
+			return -1, err
+		}
+	}
+
+	return len(p), nil
+}
--- a/main.go
+++ b/main.go
@ -0,0 +1,83 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"path/filepath"
+	"sync"
+
+	v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
+	"k8s.io/client-go/tools/clientcmd"
+	"k8s.io/client-go/util/homedir"
+)
+
+var (
+	home       = homedir.HomeDir()
+	kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
+	namespace  = flag.String("namespace", "apps", "namespace for the pods")
+	stream     = flag.Bool("stream", false, "if set, livestream logs")
+)
+
+func main() {
+	flag.Parse()
+
+	config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
+	if err != nil {
+		panic(err)
+	}
+
+	clientset, err := kubernetes.NewForConfig(config)
+	if err != nil {
+		panic(err)
+	}
+
+	podsClient := clientset.CoreV1().Pods(*namespace)
+
+	pods, err := podsClient.List(metav1.ListOptions{})
+	if err != nil {
+		panic(err)
+	}
+
+	var wg sync.WaitGroup
+	wg.Add(len(pods.Items))
+
+	for _, pod := range pods.Items {
+		if len(pod.Spec.Containers) != 1 {
+			wg.Add(len(pod.Spec.Containers) - 1)
+		}
+
+		for _, ctr := range pod.Spec.Containers {
+			go dumpLogs(podsClient, &wg, pod.Name, ctr.Name)
+		}
+	}
+
+	wg.Wait()
+}
+
+func dumpLogs(podsClient corev1.PodExpansion, wg *sync.WaitGroup, podName, ctrName string) {
+	defer wg.Done()
+
+	w := lineSplittingWriter{
+		writer: prefixWriter(fmt.Sprintf("%25s | ", ctrName), os.Stdout),
+	}
+
+	req := podsClient.GetLogs(podName, &v1.PodLogOptions{
+		Container: ctrName,
+		Follow:    *stream,
+	})
+
+	st, err := req.Stream()
+	if err != nil {
+		log.Printf("can't get logs for pod %s container %s: %v", podName, ctrName, err)
+		return
+	}
+	defer st.Close()
+
+	io.Copy(w, st)
+}
--- a/prefixwriter.go
+++ b/prefixwriter.go
@ -0,0 +1,32 @@
+package main
+
+import "io"
+
+type prefixingWriter struct {
+	prefix []byte
+	writer io.Writer
+}
+
+func (pw *prefixingWriter) Write(p []byte) (int, error) {
+	if len(p) == 0 {
+		return 0, nil
+	}
+
+	// Perform an "atomic" write of a prefix and p to make sure that it doesn't interleave
+	// sub-line when used concurrently with io.PipeWrite.
+	n, err := pw.writer.Write(append(pw.prefix, p...))
+	if n > len(p) {
+		// To comply with the io.Writer interface requirements we must
+		// return a number of bytes written from p (0 <= n <= len(p)),
+		// so we are ignoring the length of the prefix here.
+		return len(p), err
+	}
+	return n, err
+}
+
+func prefixWriter(prefix string, sink io.Writer) io.Writer {
+	return &prefixingWriter{
+		prefix: []byte(prefix),
+		writer: sink,
+	}
+}