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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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Dockerfile
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@@ -22,7 +22,8 @@ COPY . .
RUN export GOOS=$(echo ${TARGETPLATFORM} | cut -d / -f1) && \
export GOARCH=$(echo ${TARGETPLATFORM} | cut -d / -f2) && \
GOARM=$(echo ${TARGETPLATFORM} | cut -d / -f3 | cut -c2-) && \
go build -a -o manager main.go
go build -a -o manager main.go && \
go build -a -o github-webhook-server ./cmd/githubwebhookserver
# Use distroless as minimal base image to package the manager binary
# Refer to https://github.com/GoogleContainerTools/distroless for more details
@@ -31,6 +32,7 @@ FROM gcr.io/distroless/static:nonroot
WORKDIR /
COPY --from=builder /workspace/manager .
COPY --from=builder /workspace/github-webhook-server .
USER nonroot:nonroot