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Cleanup k8s logs

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This commit is contained in:
Asim Aslam 2019-12-20 23:34:08 +00:00
parent ce33e3b072
commit 847a01df82
4 changed files with 118 additions and 104 deletions
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171
debug/log/kubernetes/kubernetes.go
View File

@ -20,6 +20,78 @@ type klog struct {
log.Options
}
func (k *klog) podLogStream(podName string, stream *kubeStream) {
p := make(map[string]string)
p["follow"] = "true"
body, err := k.client.Logs(podName, client.AdditionalParams(p))
if err != nil {
fmt.Fprintf(os.Stderr, err.Error())
return
}
s := bufio.NewScanner(body)
defer body.Close()
for {
select {
case <-stream.stop:
return
default:
if s.Scan() {
record := k.parse(s.Text())
stream.stream <- record
} else {
// TODO: is there a blocking call
// rather than a sleep loop?
time.Sleep(time.Second)
}
}
}
}
func (k *klog) getMatchingPods() ([]string, error) {
r := &client.Resource{
Kind: "pod",
Value: new(client.PodList),
}
l := make(map[string]string)
l["name"] = client.Format(k.Options.Name)
// TODO: specify micro:service
// l["micro"] = "service"
if err := k.client.Get(r, l); err != nil {
return nil, err
}
var matches []string
for _, p := range r.Value.(*client.PodList).Items {
// find labels that match the name
if p.Metadata.Labels["name"] == client.Format(k.Options.Name) {
matches = append(matches, p.Metadata.Name)
}
}
return matches, nil
}
func (k *klog) parse(line string) log.Record {
record := log.Record{}
if err := json.Unmarshal([]byte(line), &record); err != nil {
record.Timestamp = time.Now().UTC()
record.Message = line
record.Metadata = make(map[string]string)
}
record.Metadata["service"] = k.Options.Name
return record
}
func (k *klog) Read(options ...log.ReadOption) ([]log.Record, error) {
opts := &log.ReadOptions{}
for _, o := range options {
@ -30,25 +102,32 @@ func (k *klog) Read(options ...log.ReadOption) ([]log.Record, error) {
if err != nil {
return nil, err
}
records := []log.Record{}
var records []log.Record
for _, l := range logsToGet {
logParams := make(map[string]string)
if !opts.Since.Equal(time.Time{}) {
logParams["sinceSeconds"] = strconv.Itoa(int(time.Since(opts.Since).Seconds()))
}
if opts.Count != 0 {
logParams["tailLines"] = strconv.Itoa(opts.Count)
}
if opts.Stream == true {
logParams["follow"] = "true"
}
logs, err := k.client.Logs(l, client.AdditionalParams(logParams))
if err != nil {
return nil, err
}
defer logs.Close()
s := bufio.NewScanner(logs)
for s.Scan() {
record := k.parse(s.Text())
record.Metadata["pod"] = l
@ -56,7 +135,9 @@ func (k *klog) Read(options ...log.ReadOption) ([]log.Record, error) {
}
}
sort.Sort(byTimestamp(records))
// sort the records
sort.Slice(records, func(i, j int) bool { return records[i].Timestamp.Before(records[j].Timestamp) })
return records, nil
}
@ -65,58 +146,23 @@ func (k *klog) Write(l log.Record) error {
}
func (k *klog) Stream() (log.Stream, error) {
return k.stream()
}
func (k *klog) stream() (log.Stream, error) {
// find the matching pods
pods, err := k.getMatchingPods()
if err != nil {
return nil, err
}
logStreamer := &klogStreamer{
streamChan: make(chan log.Record),
stop: make(chan bool),
}
errorChan := make(chan error)
go func(stopChan <-chan bool) {
for {
select {
case <-stopChan:
return
case err := <-errorChan:
fmt.Fprintf(os.Stderr, err.Error())
}
}
}(logStreamer.stop)
for _, pod := range pods {
go k.individualPodLogStreamer(pod, logStreamer.streamChan, errorChan, logStreamer.stop)
}
return logStreamer, nil
}
func (k *klog) individualPodLogStreamer(podName string, recordChan chan<- log.Record, errorChan chan<- error, stopChan <-chan bool) {
p := make(map[string]string)
p["follow"] = "true"
body, err := k.client.Logs(podName, client.AdditionalParams(p))
if err != nil {
errorChan <- err
return
stream := &kubeStream{
stream: make(chan log.Record),
stop: make(chan bool),
}
s := bufio.NewScanner(body)
defer body.Close()
for {
select {
case <-stopChan:
return
default:
if s.Scan() {
record := k.parse(s.Text())
recordChan <- record
} else {
time.Sleep(time.Second)
}
}
// stream from the individual pods
for _, pod := range pods {
go k.podLogStream(pod, stream)
}
return stream, nil
}
// New returns a configured Kubernetes logger
@ -133,34 +179,3 @@ func New(opts ...log.Option) log.Log {
}
return klog
}
func (k *klog) getMatchingPods() ([]string, error) {
r := &client.Resource{
Kind: "pod",
Value: new(client.PodList),
}
l := make(map[string]string)
l["micro"] = "runtime"
if err := k.client.Get(r, l); err != nil {
return nil, err
}
var matches []string
for _, p := range r.Value.(*client.PodList).Items {
if p.Metadata.Labels["name"] == k.Options.Name {
matches = append(matches, p.Metadata.Name)
}
}
return matches, nil
}
func (k *klog) parse(line string) log.Record {
record := log.Record{}
if err := json.Unmarshal([]byte(line), &record); err != nil {
record.Timestamp = time.Now().UTC()
record.Message = line
record.Metadata = make(map[string]string)
}
record.Metadata["service"] = k.Options.Name
return record
}

20
debug/log/kubernetes/kubernetes_test.go
View File

@ -13,33 +13,44 @@ import (
)
func TestKubernetes(t *testing.T) {
// TODO: fix local test running
return
if os.Getenv("IN_TRAVIS_CI") == "yes" {
t.Skip("In Travis CI")
}
k := New(log.Name("micro-network"))
r, w, err := os.Pipe()
if err != nil {
t.Fatal(err)
}
s := os.Stderr
os.Stderr = w
meta := make(map[string]string)
write := log.Record{
Timestamp: time.Unix(0, 0).UTC(),
Message: "Test log entry",
Metadata: meta,
}
meta["foo"] = "bar"
k.Write(write)
b := &bytes.Buffer{}
w.Close()
io.Copy(b, r)
os.Stderr = s
var read log.Record
if err := json.Unmarshal(b.Bytes(), &read); err != nil {
t.Fatalf("json.Unmarshal failed: %s", err.Error())
}
assert.Equal(t, write, read, "Write was not equal")
records, err := k.Read()
@ -48,13 +59,16 @@ func TestKubernetes(t *testing.T) {
stream, err := k.Stream()
if err != nil {
t.Error(err)
t.Fatal(err)
}
records = []log.Record{}
records = nil
go stream.Stop()
for s := range stream.Chan() {
records = append(records, s)
}
assert.Equal(t, 0, len(records), "Stream should return nothing")
assert.Equal(t, 0, len(records), "Stream should return nothing")
}

16
debug/log/kubernetes/stream.go
View File

@ -1,11 +1,11 @@
package kubernetes
import "github.com/micro/go-micro/debug/log"
import (
"encoding/json"
"fmt"
"os"
"github.com/micro/go-micro/debug/log"
)
func write(l log.Record) error {
@ -17,24 +17,24 @@ func write(l log.Record) error {
return err
}
type klogStreamer struct {
type kubeStream struct {
// the k8s log stream
streamChan chan log.Record
stream chan log.Record
// the stop chan
stop chan bool
}
func (k *klogStreamer) Chan() <-chan log.Record {
return k.streamChan
func (k *kubeStream) Chan() <-chan log.Record {
return k.stream
}
func (k *klogStreamer) Stop() error {
func (k *kubeStream) Stop() error {
select {
case <-k.stop:
return nil
default:
close(k.stop)
close(k.streamChan)
close(k.stream)
}
return nil
}

15
debug/log/kubernetes/util.go
View File

@ -1,15 +0,0 @@
package kubernetes
import "github.com/micro/go-micro/debug/log"
// ByTimestamp lets you sort log records by Timestamp (implements Sort.Sort)
type byTimestamp []log.Record
// Len returns the number of Log records (implements Sort.Sort)
func (b byTimestamp) Len() int { return len(b) }
// Swap swaps 2 Log records (implements Sort.Sort)
func (b byTimestamp) Swap(i, j int) { b[i], b[j] = b[j], b[i] }
// Less checks if a record was before another record (implements Sort.Sort)
func (b byTimestamp) Less(i, j int) bool { return b[i].Timestamp.Before(b[j].Timestamp) }