feat: initial commit

2020-08-26 16:50:59 +02:00
commit d2a946782f
10 changed files with 454 additions and 0 deletions
@@ -0,0 +1,4 @@
+vendor
+.gitignore
+.git
+Dockerfile
@@ -0,0 +1,11 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+trim_trailing_whitespace = true
+
+[*.go]
+indent_style = tab
+indent_size = 2
@@ -0,0 +1,2 @@
+.idea
+/release
@@ -0,0 +1,19 @@
+include:
+  - template: 'Workflows/MergeRequest-Pipelines.gitlab-ci.yml'
+
+stages:
+  - build
+
+variables:
+  DOCKER_HOST: tcp://docker:2375/
+
+image: buildtool/build-tools:0.0.23
+
+build:
+  stage: build
+  services:
+    - docker:dind
+  script:
+    - ci_env=`bash <(curl -s https://codecov.io/env)`
+    - build ${ci_env//-e /--build-arg }
+    - push
@@ -0,0 +1,37 @@
+FROM golang:1.15 as build
+ARG CODECOV_ENV
+ARG CODECOV_TOKEN
+ARG CODECOV_URL
+ARG CODECOV_SLUG
+ARG VCS_COMMIT_ID
+ARG VCS_BRANCH_NAME
+ARG VCS_PULL_REQUEST
+ARG VCS_SLUG
+ARG VCS_TAG
+ARG CI_BUILD_URL
+ARG CI_BUILD_ID
+ARG CI_JOB_ID
+ARG GITLAB_CI
+ARG CI_BUILD_REF_NAME
+ARG CI_BUILD_ID
+ARG CI_BUILD_REPO
+ARG CI_BUILD_REF
+WORKDIR /build
+ENV CGO_ENABLED=0
+ADD . /build
+RUN if [ $(go mod tidy -v 2>&1 | grep -c unused) != 0 ]; then echo "Unused modules, please run 'go mod tidy'"; exit 1; fi
+RUN go fmt ./...
+RUN go vet ./...
+RUN CGO_ENABLED=1 go test -mod=readonly -race -coverprofile=coverage.txt.tmp -covermode=atomic -coverpkg=$(go list ./... | tr '\n' , | sed 's/,$//') ./...
+RUN ["/bin/bash", "-c", "cat coverage.txt.tmp | grep -v -f <(find . -type f | xargs grep -l 'Code generated') > coverage.txt"]
+RUN go tool cover -html=coverage.txt -o coverage.html
+RUN go tool cover -func=coverage.txt
+RUN rm coverage.txt.tmp
+RUN curl -s https://codecov.io/bash | bash
+
+RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -mod=readonly -o release/cron-checker -ldflags '-w -s'
+
+FROM scratch
+COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=build /build/release/cron-checker /
+CMD ["/cron-checker"]
@@ -0,0 +1,7 @@
+# cron-checker
+[![Build Status](https://gitlab.com/unboundsoftware/cron-checker/badges/master/pipeline.svg)](https://gitlab.com/unboundsoftware/cron-checker/commits/master)
+[![codecov](https://codecov.io/gl/unboundsoftware/cron-checker/branch/master/graph/badge.svg?token=2GIOHTNLT3)](https://codecov.io/gl/unboundsoftware/cron-checker)
+
+A small container which periodically (every 60s) checks for a cronjobs which are not running according to schedule and sends a notification to Slack.
+
+[Example deployment-file](example/deploy.yaml)
@@ -0,0 +1,64 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: cron-checker
+---
+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: cron-checker
+rules:
+  - apiGroups: ["", "batch"]
+    resources: ["cronjobs"]
+    verbs: ["list", "watch", "get"]
+---
+
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: cron-checker
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: cron-checker
+subjects:
+  - kind: ServiceAccount
+    name: cron-checker
+---
+
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: cron-checker
+  name: cron-checker
+spec:
+  selector:
+    matchLabels:
+      app: cron-checker
+  strategy:
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 1
+    type: RollingUpdate
+  template:
+    metadata:
+      labels:
+        app: cron-checker
+    spec:
+      serviceAccountName: cron-checker
+      containers:
+        - name: cron-checker
+          resources:
+            limits:
+              memory: "50Mi"
+            requests:
+              memory: "50Mi"
+          imagePullPolicy: IfNotPresent
+          image: registry.gitlab.com/unboundsoftware/cron-checker:1.0
+          args:
+            - /cron-checker
+          env:
+            - name: SLACK_URL
+              value: <some Slack webhook URL>
+      restartPolicy: Always
@@ -0,0 +1,17 @@
+module gitlab.com/unboundsoftware/cron-checker
+
+go 1.15
+
+require (
+	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
+	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d // indirect
+	github.com/multiplay/go-slack v0.0.0-20200412115802-09e9e2b93fe2
+	github.com/robfig/cron v1.2.0
+	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d // indirect
+	golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e // indirect
+	gopkg.in/alecthomas/kingpin.v2 v2.2.6
+	k8s.io/api v0.18.8 // indirect
+	k8s.io/apimachinery v0.18.8
+	k8s.io/client-go v0.18.0
+	k8s.io/utils v0.0.0-20200821003339-5e75c0163111 // indirect
+)
@@ -0,0 +1,210 @@
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@@ -0,0 +1,83 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"github.com/multiplay/go-slack/chat"
+	"github.com/multiplay/go-slack/webhook"
+	"github.com/robfig/cron"
+	"gopkg.in/alecthomas/kingpin.v2"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+)
+
+func main() {
+	slackUrl := kingpin.Flag("slack-url", "The Slack Webhook URL").Envar("SLACK_URL").Required().String()
+	kingpin.Parse()
+
+	config, err := rest.InClusterConfig()
+	if err != nil {
+		panic(err.Error())
+	}
+	clientset, err := kubernetes.NewForConfig(config)
+	if err != nil {
+		panic(err.Error())
+	}
+
+	slack := webhook.New(*slackUrl)
+
+	parser := cron.NewParser(cron.Minute | cron.Hour | cron.Dom | cron.Month | cron.Dow)
+
+	ic := make(chan os.Signal, 1)
+	signal.Notify(ic, os.Interrupt, syscall.SIGTERM)
+
+	for {
+		select {
+		case <-ic:
+			fmt.Printf("Got SIGTERM signal, exiting\n")
+			break
+		default:
+			cronjobs, err := clientset.BatchV1beta1().CronJobs("").List(context.Background(), v1.ListOptions{})
+			if err != nil {
+				fmt.Printf("Error getting cronjobs: %s", err)
+				os.Exit(1)
+			}
+			limit := time.Now().Add(-120 * time.Second)
+			for _, c := range cronjobs.Items {
+				if c.Spec.Suspend == nil || !*c.Spec.Suspend {
+					since := c.CreationTimestamp
+					if c.Status.LastScheduleTime != nil {
+						since = *c.Status.LastScheduleTime
+					}
+					schedule, err := parser.Parse(c.Spec.Schedule)
+					if err != nil {
+						fmt.Printf("Error parsing schedule of %s/%s (%s): %s", c.Namespace, c.Name, c.Spec.Schedule, err)
+						os.Exit(1)
+					}
+					next := schedule.Next(since.Time)
+					fmt.Printf("Checking %s/%s since %s, next schedule %s, limit %s.\n", c.Namespace, c.Name, since.Format(time.RFC3339), next.Format(time.RFC3339), limit.Format(time.RFC3339))
+					if next.Before(limit) {
+						fmt.Printf("%s was not scheduled. Sending Slack notification.\n", c.Name)
+						m := &chat.Message{
+							Text:     fmt.Sprintf("Cronjob %s/%s is not running according to schedule (%s). Last scheduled: %s", c.Namespace, c.Name, c.Spec.Schedule, since.Format(time.RFC3339)),
+							Username: "cron-checker",
+						}
+						resp, err := m.Send(slack)
+						if err != nil {
+							fmt.Printf("Unable to send Slack notification: %s", err)
+						}
+						if !resp.OK {
+							fmt.Printf("Unable to send Slack notification: %s", resp.Error)
+						}
+					}
+				}
+			}
+			time.Sleep(60 * time.Second)
+		}
+	}
+}