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Webhook

The webhook notification service allows sending a generic HTTP request using the templatized request body and URL. Using Webhook you might trigger a Jenkins job, update GitHub commit status.

Parameters

The Webhook notification service configuration includes following settings:

  • url - the url to send the webhook to
  • headers - optional, the headers to pass along with the webhook
  • basicAuth - optional, the basic authentication to pass along with the webhook
  • insecureSkipVerify - optional bool, true or false
  • retryWaitMin - Optional, the minimum wait time between retries. Default value: 1s.
  • retryWaitMax - Optional, the maximum wait time between retries. Default value: 5s.
  • retryMax - Optional, the maximum number of retries. Default value: 3.
  • maxIdleConns - optional, maximum number of idle (keep-alive) connections across all hosts.
  • maxIdleConnsPerHost - optional, maximum number of idle (keep-alive) connections per host.
  • maxConnsPerHost - optional, maximum total connections per host.
  • idleConnTimeout - optional, maximum amount of time an idle (keep-alive) connection will remain open before closing, e.g. '90s'.

Retry Behavior

The webhook service will automatically retry the request if it fails due to network errors or if the server returns a 5xx status code. The number of retries and the wait time between retries can be configured using the retryMax, retryWaitMin, and retryWaitMax parameters.

The wait time between retries is between retryWaitMin and retryWaitMax. If all retries fail, the Send method will return an error.

Configuration

Use the following steps to configure webhook:

1 Register webhook in argocd-notifications-cm ConfigMap:

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
data:
  service.webhook.<webhook-name>: |
    url: https://<hostname>/<optional-path>
    headers: #optional headers
    - name: <header-name>
      value: <header-value>
    basicAuth: #optional username password
      username: <username>
      password: <api-key>
    insecureSkipVerify: true #optional bool

2 Define template that customizes webhook request method, path and body:

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
data:
  template.github-commit-status: |
    webhook:
      <webhook-name>:
        method: POST # one of: GET, POST, PUT, PATCH. Default value: GET 
        path: <optional-path-template>
        body: |
          <optional-body-template>
  trigger.<trigger-name>: |
    - when: app.status.operationState.phase in ['Succeeded']
      send: [github-commit-status]

3 Create subscription for webhook integration:

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  annotations:
    notifications.argoproj.io/subscribe.<trigger-name>.<webhook-name>: ""
  1. TLS configuration (optional)

If your webhook server uses a custom TLS certificate, you can configure the notification service to trust it by adding the certificate to the argocd-tls-certs-cm ConfigMap as shown below:

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-tls-certs-cm
data:
  <hostname>: |
    -----BEGIN CERTIFICATE-----
    <TLS DATA>
    -----END CERTIFICATE-----

NOTE: If the custom certificate is not trusted, you may encounter errors such as:

Put \"https://...\": x509: certificate signed by unknown authority

Adding the server's certificate to argocd-tls-certs-cm resolves this issue.

Examples

Set GitHub commit status

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
data:
  service.webhook.github: |
    url: https://api.github.com
    headers: #optional headers
    - name: Authorization
      value: token $github-token

2 Define template that customizes webhook request method, path and body:

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
data:
  service.webhook.github: |
    url: https://api.github.com
    headers: #optional headers
    - name: Authorization
      value: token $github-token

  template.github-commit-status: |
    webhook:
      github:
        method: POST
        path: /repos/{{call .repo.FullNameByRepoURL .app.spec.source.repoURL}}/statuses/{{.app.status.operationState.operation.sync.revision}}
        body: |
          {
            {{if eq .app.status.operationState.phase "Running"}} "state": "pending"{{end}}
            {{if eq .app.status.operationState.phase "Succeeded"}} "state": "success"{{end}}
            {{if eq .app.status.operationState.phase "Error"}} "state": "error"{{end}}
            {{if eq .app.status.operationState.phase "Failed"}} "state": "error"{{end}},
            "description": "ArgoCD",
            "target_url": "{{.context.argocdUrl}}/applications/{{.app.metadata.name}}",
            "context": "continuous-delivery/{{.app.metadata.name}}"
          }

Start Jenkins Job

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
data:
  service.webhook.jenkins: |
    url: http://<jenkins-host>/job/<job-name>/build?token=<job-secret>
    basicAuth:
      username: <username>
      password: <api-key>

type: Opaque

Send form-data

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
data:
  service.webhook.form: |
    url: https://form.example.com
    headers:
    - name: Content-Type
      value: application/x-www-form-urlencoded

  template.form-data: |
    webhook:
      form:
        method: POST
        body: key1=value1&key2=value2

Send Slack

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
data:
  service.webhook.slack_webhook: |
    url: https://hooks.slack.com/services/xxxxx
    headers:
    - name: Content-Type
      value: application/json

  template.send-slack: |
    webhook:
      slack_webhook:
        method: POST
        body: |
          {
            "attachments": [{
              "title": "{{.app.metadata.name}}",
              "title_link": "{{.context.argocdUrl}}/applications/{{.app.metadata.name}}",
              "color": "#18be52",
              "fields": [{
                "title": "Sync Status",
                "value": "{{.app.status.sync.status}}",
                "short": true
              }, {
                "title": "Repository",
                "value": "{{.app.spec.source.repoURL}}",
                "short": true
              }]
            }]
          }