From d2a946782ff60135d6367913c4dfe2577ba27394 Mon Sep 17 00:00:00 2001 From: Joakim Olsson Date: Wed, 26 Aug 2020 16:50:59 +0200 Subject: [PATCH] feat: initial commit --- .dockerignore | 4 + .editorconfig | 11 +++ .gitignore | 2 + .gitlab-ci.yml | 19 ++++ Dockerfile | 37 ++++++++ README.md | 7 ++ example/deploy.yaml | 64 ++++++++++++++ go.mod | 17 ++++ go.sum | 210 ++++++++++++++++++++++++++++++++++++++++++++ main.go | 83 +++++++++++++++++ 10 files changed, 454 insertions(+) create mode 100644 .dockerignore create mode 100644 .editorconfig create mode 100644 .gitignore create mode 100644 .gitlab-ci.yml create mode 100644 Dockerfile create mode 100644 README.md create mode 100644 example/deploy.yaml create mode 100644 go.mod create mode 100644 go.sum create mode 100644 main.go diff --git a/.dockerignore b/.dockerignore new file mode 100644 index 0000000..ac0b26d --- /dev/null +++ b/.dockerignore @@ -0,0 +1,4 @@ +vendor +.gitignore +.git +Dockerfile diff --git a/.editorconfig b/.editorconfig new file mode 100644 index 0000000..04cd3ad --- /dev/null +++ b/.editorconfig @@ -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 diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..9ada4d7 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +.idea +/release diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml new file mode 100644 index 0000000..a5733cd --- /dev/null +++ b/.gitlab-ci.yml @@ -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 diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..f47380b --- /dev/null +++ b/Dockerfile @@ -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"] diff --git a/README.md b/README.md new file mode 100644 index 0000000..521fbed --- /dev/null +++ b/README.md @@ -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) diff --git a/example/deploy.yaml b/example/deploy.yaml new file mode 100644 index 0000000..975dcd7 --- /dev/null +++ b/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: + restartPolicy: Always diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..8335ab8 --- /dev/null +++ b/go.mod @@ -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 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..d998ceb --- /dev/null +++ b/go.sum @@ -0,0 +1,210 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI= +github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0= +github.com/Azure/go-autorest/autorest/date v0.1.0/go.mod h1:plvfp3oPSKwf2DNjlBjWF/7vwR+cUD/ELuzDCXwHUVA= +github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0= +github.com/Azure/go-autorest/autorest/mocks v0.2.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0= +github.com/Azure/go-autorest/logger v0.1.0/go.mod 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h1:PlARxl6Hbt/+BC80dRLi1qAmnMqwqDg62YvvVkZjemw= +sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o= +sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q= +sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc= diff --git a/main.go b/main.go new file mode 100644 index 0000000..321a97b --- /dev/null +++ b/main.go @@ -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) + } + } +}