From 77dd6f342fda7042db92d9b32565e69eea0ea1b5 Mon Sep 17 00:00:00 2001 From: Adrian Rumpold Date: Tue, 16 Jul 2024 11:13:07 +0200 Subject: [PATCH] feat(watcher): Add rudimentary notification tooling The `watcher` Go application uses the Kubernetes client API to monitor jobs in the current namespace and send notifications for major lifecycle events. Jobs need to be annotated in order to be eligible for notifications: Use`x-jobby.io/notify-channel: [slack|webhook]` to determine the notification channel (HTTP webhook or Slack), and then control the destinations with `x-jobby.io/slack-channel-ids` (comma-separated) or `x-jobby.io/webhook-urls` (comma-separated) annotations. If using the Slack notification channel, pass the Slack API token through the `WATCHER_SLACK_API_TOKEN` env variable. --- watcher/.gitignore | 2 + watcher/.ko.yaml | 2 + watcher/go.mod | 58 ++++++++++ watcher/go.sum | 174 ++++++++++++++++++++++++++++++ watcher/k8s/job.yaml | 12 +++ watcher/k8s/rbac.yaml | 12 +++ watcher/main.go | 241 ++++++++++++++++++++++++++++++++++++++++++ watcher/skaffold.yaml | 8 ++ 8 files changed, 509 insertions(+) create mode 100644 watcher/.gitignore create mode 100644 watcher/.ko.yaml create mode 100644 watcher/go.mod create mode 100644 watcher/go.sum create mode 100644 watcher/k8s/job.yaml create mode 100644 watcher/k8s/rbac.yaml create mode 100644 watcher/main.go create mode 100644 watcher/skaffold.yaml diff --git a/watcher/.gitignore b/watcher/.gitignore new file mode 100644 index 00000000..dc2d046a --- /dev/null +++ b/watcher/.gitignore @@ -0,0 +1,2 @@ +# Binary output +watcher diff --git a/watcher/.ko.yaml b/watcher/.ko.yaml new file mode 100644 index 00000000..82201fa7 --- /dev/null +++ b/watcher/.ko.yaml @@ -0,0 +1,2 @@ +defaultPlatforms: + - linux/arm64 diff --git a/watcher/go.mod b/watcher/go.mod new file mode 100644 index 00000000..e4cc7461 --- /dev/null +++ b/watcher/go.mod @@ -0,0 +1,58 @@ +module watcher + +go 1.22.5 + +require ( + github.com/nikoksr/notify v0.41.0 + github.com/sirupsen/logrus v1.9.3 + k8s.io/api v0.30.2 + k8s.io/apimachinery v0.30.2 + k8s.io/client-go v0.30.2 +) + +require ( + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/emicklei/go-restful/v3 v3.11.0 // indirect + github.com/go-logr/logr v1.4.1 // indirect + github.com/go-openapi/jsonpointer v0.19.6 // indirect + github.com/go-openapi/jsonreference v0.20.2 // indirect + github.com/go-openapi/swag v0.22.3 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/protobuf v1.5.4 // indirect + github.com/google/gnostic-models v0.6.8 // indirect + github.com/google/go-cmp v0.6.0 // indirect + github.com/google/gofuzz v1.2.0 // indirect + github.com/google/uuid v1.3.0 // indirect + github.com/gorilla/websocket v1.5.0 // indirect + github.com/imdario/mergo v0.3.6 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/mailru/easyjson v0.7.7 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/pmezard/go-difflib v1.0.0 // indirect + github.com/slack-go/slack v0.12.2 // indirect + github.com/spf13/pflag v1.0.5 // indirect + github.com/stretchr/objx v0.5.0 // indirect + github.com/stretchr/testify v1.8.4 // indirect + golang.org/x/net v0.23.0 // indirect + golang.org/x/oauth2 v0.10.0 // indirect + golang.org/x/sync v0.7.0 // indirect + golang.org/x/sys v0.18.0 // indirect + golang.org/x/term v0.18.0 // indirect + golang.org/x/text v0.14.0 // indirect + golang.org/x/time v0.3.0 // indirect + google.golang.org/appengine v1.6.7 // indirect + google.golang.org/protobuf v1.33.0 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + k8s.io/klog/v2 v2.120.1 // indirect + k8s.io/kube-openapi v0.0.0-20240228011516-70dd3763d340 // indirect + k8s.io/utils v0.0.0-20230726121419-3b25d923346b // indirect + sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.4.1 // indirect + sigs.k8s.io/yaml v1.3.0 // indirect +) diff --git a/watcher/go.sum b/watcher/go.sum new file mode 100644 index 00000000..1762e062 --- /dev/null +++ b/watcher/go.sum @@ -0,0 +1,174 @@ +github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1 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+1,12 @@ +apiVersion: batch/v1 +kind: Job +metadata: + name: watcher +spec: + ttlSecondsAfterFinished: 120 + template: + spec: + containers: + - name: watcher + image: ko-watcher + restartPolicy: OnFailure diff --git a/watcher/k8s/rbac.yaml b/watcher/k8s/rbac.yaml new file mode 100644 index 00000000..c5318f80 --- /dev/null +++ b/watcher/k8s/rbac.yaml @@ -0,0 +1,12 @@ +apiVersion: rbac.authorization.k8s.io/v1 +kind: ClusterRoleBinding +metadata: + name: test-foo +roleRef: + apiGroup: rbac.authorization.k8s.io + kind: ClusterRole + name: view +subjects: + - kind: ServiceAccount + name: default + namespace: default diff --git a/watcher/main.go b/watcher/main.go new file mode 100644 index 00000000..113258e3 --- /dev/null +++ b/watcher/main.go @@ -0,0 +1,241 @@ +package main + +import ( + "bytes" + "context" + "fmt" + "io" + "os" + "strings" + "time" + + "github.com/nikoksr/notify" + log "github.com/sirupsen/logrus" + batchv1 "k8s.io/api/batch/v1" + corev1 "k8s.io/api/core/v1" + v1 "k8s.io/apimachinery/pkg/apis/meta/v1" + kubeinformers "k8s.io/client-go/informers" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/tools/cache" + "k8s.io/client-go/tools/clientcmd" + + httpnotify "github.com/nikoksr/notify/service/http" + "github.com/nikoksr/notify/service/slack" +) + +var ( + config, _ = clientcmd.BuildConfigFromFlags("", os.Getenv("KUBECONFIG")) + clientset, _ = kubernetes.NewForConfig(config) +) + +// Check if a job has transitioned from being suspended to running +func wasUnsuspended(oldJob *batchv1.Job, newJob *batchv1.Job) bool { + if oldJob.Spec.Suspend == nil || newJob.Spec.Suspend == nil { + return false + } + return *oldJob.Spec.Suspend && !*newJob.Spec.Suspend +} + +// Check if a Job is completed +func isCompleted(job *batchv1.Job) bool { + return job.Status.CompletionTime != nil +} + +func getNotifierKey(obj *batchv1.Job) string { + notifier := obj.Annotations["x-jobby.io/notify-channel"] + return notifier +} + +func getNotifier(key string, jobAnnotations map[string]string) notify.Notifier { + switch key { + case "slack": + log.Debug("Using Slack notifier") + service := slack.New(os.Getenv("WATCHER_SLACK_API_TOKEN")) + receivers := jobAnnotations["x-jobby.io/slack-channel-ids"] + log.Debug("Slack notifier channel IDs: ", receivers) + + if receivers == "" { + return nil + } + service.AddReceivers(strings.Split(receivers, ",")...) + return service + + case "webhook": + log.Debug("Using Webhook notifier") + service := httpnotify.New() + receivers := jobAnnotations["x-jobby.io/webhook-urls"] + log.Debug("Webhook notifier URLs: ", receivers) + + if receivers == "" { + return nil + } + service.AddReceiversURLs(strings.Split(receivers, ",")...) + return service + } + return nil +} + +func handleUpdate(obj interface{}, newObj interface{}) { + job := obj.(*batchv1.Job) + newJob := newObj.(*batchv1.Job) + + notifierKey := getNotifierKey(job) + notifier := getNotifier(notifierKey, newJob.Annotations) + if notifier == nil { + log.Warnf("Could not determine notifier, %+v", job.Annotations) + return + } + useMarkdown := notifierKey == "slack" + + if wasUnsuspended(job, newJob) { + var subject, body string + if useMarkdown { + subject = fmt.Sprintf(":runner: *+++ Job `%s` started running +++*", job.Name) + body = formatJob(job, true) + } else { + subject = "Job started running" + body = formatJob(job, true) + } + + notifier.Send(context.Background(), subject, body) + } + if !isCompleted(job) && isCompleted(newJob) { + var subject, body string + if useMarkdown { + subject = fmt.Sprintf(":white_check_mark: *+++ Job `%s` completed +++*", job.Name) + outputs, _ := collectJobOutputs(job) + + buf := new(strings.Builder) + for podName, logs := range outputs { + fmt.Fprintf(buf, "Pod `%s` logs\n\n```\n%s\n```\n\n", podName, logs) + } + body = buf.String() + } else { + subject = "Job completed" + body = formatJob(job, false) + } + + notifier.Send(context.Background(), subject, body) + } +} + +func getManagedPods(job *batchv1.Job) ([]corev1.Pod, error) { + pods, err := clientset.CoreV1().Pods(job.Namespace).List(context.TODO(), v1.ListOptions{ + LabelSelector: fmt.Sprintf("controller-uid=%s", job.UID), + }) + return pods.Items, err +} + +func getPodLogs(pod corev1.Pod) (string, error) { + req := clientset.CoreV1().Pods(pod.Namespace).GetLogs(pod.Name, &corev1.PodLogOptions{}) + logs, err := req.Stream(context.TODO()) + if err != nil { + return "", err + } + defer logs.Close() + + buf := new(bytes.Buffer) + _, err = io.Copy(buf, logs) + if err != nil { + return "", nil + } + return buf.String(), nil +} + +func collectJobOutputs(job *batchv1.Job) (map[string]string, error) { + managedPods, err := getManagedPods(job) + if err != nil { + return nil, err + } + + result := make(map[string]string, len(managedPods)) + + for _, pod := range managedPods { + logs, err := getPodLogs(pod) + if err != nil { + return nil, err + } + result[pod.Name] = logs + } + + return result, nil +} + +func formatJob(job *batchv1.Job, markdown bool) string { + msg := new(strings.Builder) + + if markdown { + fmt.Fprintf(msg, "Job `%s` `[%d/%d/%d]`\n", job.Name, job.Status.Active, job.Status.Succeeded, job.Status.Failed) + } else { + fmt.Fprintf(msg, "Job %q [%d/%d/%d]\n", job.Name, job.Status.Active, job.Status.Succeeded, job.Status.Failed) + } + + // Labels + if len(job.Labels) > 0 { + msg.WriteString("\nLabels: \n") + for key, value := range job.Labels { + if markdown { + fmt.Fprintf(msg, " `%s: %s`\n", key, value) + } else { + fmt.Fprintf(msg, " %s: %s\n", key, value) + } + } + } + + // Annotations + if len(job.Annotations) > 0 { + msg.WriteString("\nAnnotations: \n") + for key, value := range job.Annotations { + if markdown { + fmt.Fprintf(msg, " `%s: %s`\n", key, value) + } else { + fmt.Fprintf(msg, " %s: %s\n", key, value) + } + } + } + + // Managed Pods + pods, _ := getManagedPods(job) + msg.WriteString("Managed pods:\n") + for _, pod := range pods { + if markdown { + fmt.Fprintf(msg, " + Pod `%s`, state `%s`\n", pod.Name, pod.Status.Phase) + } else { + fmt.Fprintf(msg, " + Pod %q, state %s\n", pod.Name, pod.Status.Phase) + } + } + msg.WriteString("---\n") + return msg.String() +} + +func watchJobs(namespace string) { + log.Info("Watching jobs in namespace ", namespace) + + informerFactory := kubeinformers.NewSharedInformerFactoryWithOptions(clientset, 10*time.Minute, kubeinformers.WithNamespace(namespace)) + jobsInformer := informerFactory.Batch().V1().Jobs().Informer() + + jobsInformer.AddEventHandler( + cache.ResourceEventHandlerFuncs{ + UpdateFunc: handleUpdate, + }, + ) + stop := make(chan struct{}) + go informerFactory.Start(stop) + if !cache.WaitForCacheSync(stop, jobsInformer.HasSynced) { + log.Fatal("Timed out waiting for initial cache sync") + } +} + +func main() { + log.SetLevel(log.DebugLevel) + log.SetFormatter(&log.TextFormatter{ + DisableTimestamp: true, + DisableQuote: true, + ForceColors: true, + }) + + namespace := corev1.NamespaceDefault + watchJobs(namespace) + + select {} +} diff --git a/watcher/skaffold.yaml b/watcher/skaffold.yaml new file mode 100644 index 00000000..b043adf1 --- /dev/null +++ b/watcher/skaffold.yaml @@ -0,0 +1,8 @@ +apiVersion: skaffold/v4beta11 +kind: Config +build: + artifacts: + - image: ko-watcher + ko: {} +deploy: + kubectl: {}