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feat: HorizontalRunnerAutoscaler Webhook server (#282)

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* feat: HorizontalRunnerAutoscaler Webhook server

This introduces a Webhook server that responds GitHub `check_run`, `pull_request`, and `push` events by scaling up matched HorizontalRunnerAutoscaler by 1 replica. This allows you to immediately add "resource slack" for future GitHub Actions job runs, without waiting next sync period to add insufficient runners.

This feature is highly inspired by https://github.com/philips-labs/terraform-aws-github-runner. terraform-aws-github-runner can manage one set of runners per deployment, where actions-runner-controller with this feature can manage as many sets of runners as you declare with HorizontalRunnerAutoscaler and RunnerDeployment pairs.

On each GitHub event received, the webhook server queries repository-wide and organizational runners from the cluster and searches for the single target to scale up. The webhook server tries to match HorizontalRunnerAutoscaler.Spec.ScaleUpTriggers[].GitHubEvent.[CheckRun|Push|PullRequest] against the event and if it finds only one HRA, it is the scale target. If none or two or more targets are found for repository-wide runners, it does the same on organizational runners.

Changes:

* Fix integration test
* Update manifests
* chart: Add support for github webhook server
* dockerfile: Include github-webhook-server binary
* Do not import unversioned go-github
* Update README
This commit is contained in:
Yusuke Kuoka
2021-02-07 17:37:27 +09:00
committed by GitHub
parent a4350d0fc2
commit ab1c39de57
31 changed files with 1993 additions and 45 deletions
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17
charts/actions-runner-controller/templates/githubwebhook.service.yaml Normal file
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{{- if .Values.githubWebhookServer.enabled }}
apiVersion: v1
kind: Service
metadata:
name: {{ include "actions-runner-controller-github-webhook-server.fullname" . }}
namespace: {{ .Release.Namespace }}
labels:
{{- include "actions-runner-controller.labels" . | nindent 4 }}
spec:
type: {{ .Values.githubWebhookServer.service.type }}
ports:
{{ range $_, $port := .Values.githubWebhookServer.service.ports -}}
- {{ $port | toYaml | nindent 6 }}
{{- end }}
selector:
{{- include "actions-runner-controller-github-webhook-server.selectorLabels" . | nindent 4 }}
{{- end }}