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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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22
github/fake/fake.go
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@@ -24,6 +24,16 @@ const (
`
)
type ListRunnersHandler struct {
Status int
Body string
}
func (h *ListRunnersHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
w.WriteHeader(h.Status)
fmt.Fprintf(w, h.Body)
}
type Handler struct {
Status int
Body string
@@ -94,10 +104,7 @@ func NewServer(opts ...Option) *httptest.Server {
},
// For ListRunners
"/repos/test/valid/actions/runners": &Handler{
Status: http.StatusOK,
Body: RunnersListBody,
},
"/repos/test/valid/actions/runners": config.FixedResponses.ListRunners,
"/repos/test/invalid/actions/runners": &Handler{
Status: http.StatusNoContent,
Body: "",
@@ -159,3 +166,10 @@ func NewServer(opts ...Option) *httptest.Server {
return httptest.NewServer(mux)
}
func DefaultListRunnersHandler() *ListRunnersHandler {
return &ListRunnersHandler{
Status: http.StatusOK,
Body: RunnersListBody,
}
}