feat(frontend): add opt-in HTTP API toggle with configurable port and…

[HoaMi]

Summary

Adds an opt-in HTTP API on the Cadence frontend, disabled by default, as described in https://cadenceworkflow.io/docs/concepts/http-api.

New values under frontend.httpApi:

• enabled (default false)
• port (default 8800)
• procedures (default [], list of <proto-pkg>.<Service>::<Method> entries to expose)

When enabled, the chart:

• renders an http: { port, procedures } block under services.frontend.rpc in the server config,
• exposes an http port on the frontend Service,
• declares the matching containerPort on the frontend Deployment.

When disabled (default), no HTTP port or config section is produced, so existing deployments are unchanged.

Docs regenerated with helm-docs.

Test plan

• helm lint charts/cadence passes
• helm template with defaults: no http: block, no 8800 port anywhere
• helm template with frontend.httpApi.enabled=true and a procedures list: http block rendered under services.frontend.rpc, http port on Service and Deployment
• Deploy to a cluster, curl an exposed procedure against the frontend http port

[gitar-bot]

Code Review ✅ Approved 1 resolved / 1 findings

Adds an opt-in HTTP API toggle with configurable settings and fixes the empty procedures list rendering, ensuring it returns an empty array instead of null.

✅ 1 resolved

✅ Edge Case: Empty procedures list renders as null instead of empty array

📄 charts/cadence/templates/server-configmap.yaml:510-513
When httpApi.enabled=true but procedures is left as the default empty list [], the range loop produces no items, so the rendered YAML becomes:

http:
  port: 8800
  procedures:

YAML parses a bare procedures: key as null, not as an empty list []. Depending on how the Cadence server deserializes this, it may panic on a nil slice or reject the config. This is the most likely misconfiguration since the default is procedures: [].

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