Improve Vacation Planner Implementation

[paolosalvatori]

Motivation

Two cosmetic but recurring runtime issues affect all four vacation-planner web-app samples when running on Azure App Service / Oryx-launched gunicorn:

1. Exit produces a Python traceback. The default worker_int handler raises SystemExit(0) inside the worker's socket.recv() loop, which unwinds through gunicorn's HTTP parser frames and dumps a misleading stack trace before the process exits.
2. Worker timeout produces a Python traceback. When a sync worker misses its heartbeat (idle keep-alive connection, slow client, etc.), the arbiter sends SIGABRT. The default worker_abort handler does sys.exit(1), which unwinds through the same recv() stack and prints a stack trace after the genuine [CRITICAL] WORKER TIMEOUT (pid:N) diagnostic line — making logs noisier and harder to read.

Both issues are signal-handling artifacts, not application bugs. The proper fix is to override gunicorn's per-worker signal hooks with os._exit() calls that bypass the Python exception unwind.

Separately, the pinned dependency versions in each requirements.txt had drifted behind the latest stable PyPI releases. Bumping them in the same PR keeps the samples on supported, security-patched dependencies — including gunicorn 26.0.0, the same version used by these hooks.

Changes

New files — each sample gets a src/gunicorn.conf.py with the same two hook overrides. Gunicorn auto-discovers ./gunicorn.conf.py from the working directory on App Service (/home/site/wwwroot), so no Oryx startup-command override is required.

• web-app-cosmosdb-mongodb-api/python/src/gunicorn.conf.py
• web-app-cosmosdb-nosql-api/python/src/gunicorn.conf.py
• web-app-managed-identity/python/src/gunicorn.conf.py
• web-app-sql-database/python/src/gunicorn.conf.py

Each file defines:

• worker_int(worker) → os._exit(0). Suppresses the SystemExit traceback on SIGINT/SIGQUIT. SIGTERM (graceful shutdown) goes through a different code path and is unaffected.
• worker_abort(worker) → os._exit(1). Suppresses the SystemExit traceback on SIGABRT (worker timeout). The [CRITICAL] WORKER TIMEOUT log line — the genuine diagnostic — is still emitted.

Modified files — each requirements.txt bumped to the latest stable PyPI version per package. Flask, python-dotenv, and pyodbc were already at latest; only behind-versions are listed below.

• web-app-cosmosdb-mongodb-api/python/src/requirements.txt
  • azure-identity: 1.25.1 → 1.25.3
  • pymongo: 4.15.3 → 4.17.0
  • gunicorn: 23.0.0 → 26.0.0
• web-app-cosmosdb-nosql-api/python/src/requirements.txt
  • azure-mgmt-cosmosdb: 9.8.0 → 9.9.0
  • azure-cosmos: 4.7.0 → 4.15.0
  • gunicorn: 22.0.0 → 26.0.0
  • setuptools: 79.0.1 → 82.0.1
• web-app-managed-identity/python/src/requirements.txt
  • azure-identity: 1.16.1 → 1.25.3
  • azure-storage-blob: 12.26.0 → 12.29.0
  • azure-core: 1.38.0 → 1.41.0
  • gunicorn: 23.0.0 → 26.0.0
• web-app-sql-database/python/src/requirements.txt
  • gunicorn: 25.3.0 → 26.0.0
  • azure-keyvault-secrets: 4.10.0 → 4.11.0
  • azure-keyvault-certificates: 4.10.0 → 4.11.1
  • cryptography: 46.0.7 → 48.0.0

No application code, templates, static assets, scripts, or IaC was touched. Behavior of each sample is unchanged at the request-handling layer; only signal handling and dependency floors move.

[Copilot]

Pull request overview

This PR updates the Python “Vacation Planner” web-app samples to (1) suppress misleading Gunicorn tracebacks during worker shutdown/timeout by adding per-sample gunicorn.conf.py hooks, and (2) bump pinned dependencies in each sample’s requirements.txt to newer versions.

Changes:

• Added src/gunicorn.conf.py to each of the four vacation-planner Flask samples, overriding worker_int / worker_abort to call os._exit(...).
• Updated pinned package versions (notably gunicorn==26.0.0 across all four samples, plus Azure SDK / DB-related deps where applicable).

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
samples/web-app-sql-database/python/src/requirements.txt	Bumps Gunicorn + Key Vault + cryptography pins for the SQL Database sample.
samples/web-app-sql-database/python/src/gunicorn.conf.py	Adds Gunicorn worker signal hooks to avoid tracebacks on exit/timeout.
samples/web-app-managed-identity/python/src/requirements.txt	Updates Azure SDK + Gunicorn pins for the Managed Identity sample.
samples/web-app-managed-identity/python/src/gunicorn.conf.py	Adds Gunicorn worker signal hooks to avoid tracebacks on exit/timeout.
samples/web-app-cosmosdb-nosql-api/python/src/requirements.txt	Updates Cosmos/management SDK + Gunicorn + setuptools pins for the NoSQL sample.
samples/web-app-cosmosdb-nosql-api/python/src/gunicorn.conf.py	Adds Gunicorn worker signal hooks to avoid tracebacks on exit/timeout.
samples/web-app-cosmosdb-mongodb-api/python/src/requirements.txt	Updates azure-identity/pymongo + Gunicorn pins for the MongoDB API sample.
samples/web-app-cosmosdb-mongodb-api/python/src/gunicorn.conf.py	Adds Gunicorn worker signal hooks to avoid tracebacks on exit/timeout.

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[DrisDary]

LGTM