feat(judge): configure request routing keys

[lshtar13]

Summary

Load judge request routing keys from Nest environment configuration while preserving the former shared submission-queue behavior for deployments that have not set the new keys.

Changes

• Configure SUBMISSION_KEY, TEST_KEY, and REJUDGE_KEY at runtime.
• Fall back from each new key to JUDGE_SUBMISSION_ROUTING_KEY, then judge.submission.
• Keep tests and rejudges on the previous submission route when only the legacy value is configured.
• Document the new keys and legacy fallback in the backend environment example.

Validation

• Added focused JudgeAMQPService routing tests for configured, legacy-only, and unset configurations.
• Ran Prettier and git diff --check.

Summary by CodeRabbit

• Improvements

  • Improved routing for submissions, tests, user tests, and rejudging requests.
  • Added configurable workload-specific routing options for flexible judging workflows.
  • Preserved compatibility with existing configurations through fallback behavior.
  • Improved delivery consistency by directing each judging request to the appropriate route.

• Documentation

  • Updated publication guidance to reflect workload-specific message routing.

• Tests

  • Added coverage for routing scenarios to support reliable request processing.

[chatgpt-codex-connector]

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Reviewing files that changed from the base of the PR and between 6e6006e and ec45abb.

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• apps/backend/.env.example

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📝 Walkthrough

Walkthrough

RabbitMQ judge messages now use workload-specific routing keys for submission, test, and rejudge requests. Configuration supports legacy and default fallbacks. Tests cover configured keys and both fallback paths.

Changes

Judge message routing

Layer / File(s)	Summary
Routing configuration and default contract apps/backend/.env.example, apps/backend/libs/constants/src/rabbitmq.constants.ts	The environment example documents workload-specific routing keys and leaves test and rejudge keys unset by default. SUBMISSION_KEY is renamed to DEFAULT_SUBMISSION_KEY without changing its value.
Dynamic routing selection and validation apps/backend/libs/amqp/src/amqp.service.ts, apps/backend/libs/amqp/src/amqp.service.spec.ts, apps/backend/apps/client/src/submission/submission-pub.service.ts	JudgeAMQPService selects configured workload keys, then JUDGE_SUBMISSION_ROUTING_KEY, then DEFAULT_SUBMISSION_KEY. Tests cover each routing path. Publication documentation describes the selected routing key.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to ec45a

The change adds configurable request routing keys while preserving legacy behavior through fallbacks; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: configuring Judge request routing keys with fallback behavior.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 4…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 4 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch t2852-nest-routing-env

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[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@apps/backend/.env.example`:
- Around line 21-22: Update the RabbitMQ provisioning in initRabbitMQ and the
Kubernetes judge queue topology to bind TEST_KEY and REJUDGE_KEY alongside
judge.submission, matching the keys selected by JudgeAMQPService; alternatively,
change those defaults to use the submission route consistently.

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Fix all unresolved CodeRabbit comments on this PR:

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• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: 4c257966-d528-4d54-a144-3291a7956829

📥 Commits

Reviewing files that changed from the base of the PR and between 06e8337 and 6e6006e.

📒 Files selected for processing (5)

• apps/backend/.env.example
• apps/backend/apps/client/src/submission/submission-pub.service.ts
• apps/backend/libs/amqp/src/amqp.service.spec.ts
• apps/backend/libs/amqp/src/amqp.service.ts
• apps/backend/libs/constants/src/rabbitmq.constants.ts

Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review.

[lukekeum]

LGTM 👍

[lukekeum]

Merge when you ready :)

[lukekeum]

Merge when you ready :)

Ah.. this pr is for main