Add SIGINT/SIGTERM handlers for graceful and timely shutdown.

[apognu]

Summary by CodeRabbit

• New Features
  • Added graceful shutdown behavior to the server when it receives interrupt or termination signals.
  • The server now stops accepting new work and can allow in-flight requests to complete more cleanly before exiting.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e87432ef-aa1b-4da7-be3b-ba03e50830ed

📥 Commits

Reviewing files that changed from the base of the PR and between 26f69fd and 882bc71.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (7)

• .github/workflows/build.yml
• .github/workflows/deploy.yml
• .github/workflows/docker.yml
• .github/workflows/production.yml
• .github/workflows/staging.yml
• Cargo.toml
• src/main.rs

📝 Walkthrough

Walkthrough

The server now enables Tokio signal support, starts Axum with graceful shutdown, and awaits a new shutdown future that listens for SIGINT and SIGTERM.

Changes

Graceful shutdown

Layer / File(s)	Summary
Server wiring Cargo.toml, src/main.rs	tokio gains the signal feature, and main now starts Axum with with_graceful_shutdown(shutdown()).
Signal shutdown handler src/main.rs	shutdown() installs Ctrl-C and SIGTERM handlers, then uses tokio::select! to resolve when either signal arrives and log it.

Sequence Diagram(s)

sequenceDiagram
  participant main
  participant Serve as "axum::serve(...).with_graceful_shutdown(shutdown())"
  participant Shutdown as "shutdown()"
  participant CtrlC as "tokio::signal::ctrl_c()"
  participant Terminate as "tokio::signal::unix::signal(SignalKind::terminate())"
  main->>Serve: start server
  Serve->>Shutdown: await shutdown()
  Shutdown->>CtrlC: listen for SIGINT
  Shutdown->>Terminate: listen for SIGTERM
  CtrlC-->>Shutdown: Ctrl-C received
  Terminate-->>Shutdown: SIGTERM received
  Shutdown-->>Serve: resolve
  Serve-->>main: exit

Loading

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

The server hears the winter wind at last,
And bows to SIGINT when shadows pass.
SIGTERM, too, finds a gentle lane,
While Axum sleeps and wakes not in vain.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: adding SIGINT/SIGTERM handling for graceful shutdown.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/signal-handlers

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@src/main.rs`:
- Line 87: The ctrl-c handler setup in main has a typo in the expect message,
making the panic text unclear if it ever triggers. Update the expect call on
ctrl_c in main to use a plain, correctly spelled message like “failed to install
sigint handler” so the error reads clearly when signal::ctrl_c() fails.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 17f4b5a3-2aa1-4719-9188-e2f511ac4eaa

📥 Commits

Reviewing files that changed from the base of the PR and between c3f6ef1 and f38d7c9.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (2)

• Cargo.toml
• src/main.rs

📜 Review details

⏰ Context from checks skipped due to timeout. (2)

• GitHub Check: build (cpu)
• GitHub Check: Analyze (rust)

🔇 Additional comments (3)

Cargo.toml (1)

21-21: LGTM!

src/main.rs (2)

40-40: LGTM!

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84-97: LGTM!

[Pascal-Delange]

Thx!