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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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52
charts/actions-runner-controller/templates/_github_webhook_server_helpers.tpl Normal file
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{{/*
Expand the name of the chart.
*/}}
{{- define "actions-runner-controller-github-webhook-server.name" -}}
{{- default .Chart.Name .Values.githubWebhookServer.nameOverride | trunc 63 | trimSuffix "-" }}
{{- end }}
{{- define "actions-runner-controller-github-webhook-server.instance" -}}
{{- printf "%s-%s" .Release.Name "github-webhook-server" }}
{{- end }}
{{/*
Create a default fully qualified app name.
We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
If release name contains chart name it will be used as a full name.
*/}}
{{- define "actions-runner-controller-github-webhook-server.fullname" -}}
{{- if .Values.githubWebhookServer.fullnameOverride }}
{{- .Values.githubWebhookServer.fullnameOverride | trunc 63 | trimSuffix "-" }}
{{- else }}
{{- $name := default .Chart.Name .Values.githubWebhookServer.nameOverride }}
{{- $instance := include "actions-runner-controller-github-webhook-server.instance" . }}
{{- if contains $name $instance }}
{{- $instance | trunc 63 | trimSuffix "-" }}
{{- else }}
{{- printf "%s-%s-%s" .Release.Name $name "github-webhook-server" | trunc 63 | trimSuffix "-" }}
{{- end }}
{{- end }}
{{- end }}
{{/*
Selector labels
*/}}
{{- define "actions-runner-controller-github-webhook-server.selectorLabels" -}}
app.kubernetes.io/name: {{ include "actions-runner-controller-github-webhook-server.name" . }}
app.kubernetes.io/instance: {{ include "actions-runner-controller-github-webhook-server.instance" . }}
{{- end }}
{{/*
Create the name of the service account to use
*/}}
{{- define "actions-runner-controller-github-webhook-server.serviceAccountName" -}}
{{- if .Values.githubWebhookServer.serviceAccount.create }}
{{- default (include "actions-runner-controller-github-webhook-server.fullname" .) .Values.githubWebhookServer.serviceAccount.name }}
{{- else }}
{{- default "default" .Values.githubWebhookServer.serviceAccount.name }}
{{- end }}
{{- end }}
{{- define "actions-runner-controller-github-webhook-server.roleName" -}}
{{- include "actions-runner-controller-github-webhook-server.fullname" . }}
{{- end }}