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| 1 | """Read aggregate connection capacity with libpq; never print credentials or SQL data.""" | ||
| 2 | |||
| 3 | import json | ||
| 4 | import os | ||
| 5 | import subprocess | ||
| 6 | import sys | ||
| 7 | from urllib.parse import unquote, urlparse | ||
| 8 | |||
| 9 | |||
| 10 | def main() -> int: | ||
| 11 | try: | ||
| 12 | url = urlparse(os.environ["DATABASE_URL"]) | ||
| 13 | if url.scheme not in ("postgres", "postgresql") or not url.hostname: | ||
| 14 | raise ValueError("Invalid database URL") | ||
| 15 | if url.hostname.endswith(".psdb.cloud") and url.port not in (None, 5432): | ||
| 16 | raise ValueError("Capacity checks require the direct endpoint") | ||
| 17 | env = { | ||
| 18 | **os.environ, | ||
| 19 | "PGHOST": url.hostname, | ||
| 20 | "PGPORT": str(url.port or 5432), | ||
| 21 | "PGUSER": unquote(url.username or ""), | ||
| 22 | "PGPASSWORD": unquote(url.password or ""), | ||
| 23 | "PGDATABASE": unquote(url.path.removeprefix("/")), | ||
| 24 | "PGSSLMODE": "require", | ||
| 25 | "PGCONNECT_TIMEOUT": "10", | ||
| 26 | "PGAPPNAME": "database-capacity-check", | ||
| 27 | "PGOPTIONS": "-c default_transaction_read_only=on -c statement_timeout=10000", | ||
| 28 | } | ||
| 29 | result = subprocess.run( | ||
| 30 | ["psql", "-X", "-A", "-t", "-v", "ON_ERROR_STOP=1", "-c", """ | ||
| 31 | SELECT json_build_object( | ||
| 32 | 'limit', current_setting('max_connections')::int, | ||
| 33 | 'reserved', current_setting('superuser_reserved_connections')::int | ||
| 34 | + current_setting('reserved_connections')::int, | ||
| 35 | 'used', count(*)::int | ||
| 36 | ) FROM pg_stat_activity WHERE backend_type = 'client backend' | ||
| 37 | """], | ||
| 38 | env=env, | ||
| 39 | capture_output=True, | ||
| 40 | text=True, | ||
| 41 | timeout=25, | ||
| 42 | check=True, | ||
| 43 | ) | ||
| 44 | capacity = json.loads(result.stdout) | ||
| 45 | if any(type(capacity[key]) is not int for key in ("limit", "reserved", "used")): | ||
| 46 | raise ValueError("Invalid capacity response") | ||
| 47 | free = capacity["limit"] - capacity["reserved"] - capacity["used"] | ||
| 48 | print(json.dumps({**capacity, "ordinary_free": free, "minimum_free": 10})) | ||
| 49 | if free < 10: | ||
| 50 | print("::error::Database connection headroom is below 10 slots. Inspect direct clients and the PgBouncer budget.") | ||
| 51 | return 1 | ||
| 52 | return 0 | ||
| 53 | except (KeyError, ValueError, OSError, subprocess.SubprocessError): | ||
| 54 | print("::error::Database capacity check failed. Check direct endpoint access and provider health.") | ||
| 55 | return 1 | ||
| 56 | |||
| 57 | |||
| 58 | if __name__ == "__main__": | ||
| 59 | sys.exit(main()) | ||
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| 1 | name: Database capacity | ||
| 2 | |||
| 3 | on: | ||
| 4 | schedule: | ||
| 5 | - cron: "2-57/5 * * * *" | ||
| 6 | workflow_dispatch: | ||
| 7 | |||
| 8 | permissions: | ||
| 9 | contents: read | ||
| 10 | |||
| 11 | concurrency: | ||
| 12 | group: database-capacity | ||
| 13 | cancel-in-progress: false | ||
| 14 | |||
| 15 | jobs: | ||
| 16 | check: | ||
| 17 | runs-on: ubuntu-24.04 | ||
| 18 | timeout-minutes: 2 | ||
| 19 | environment: production | ||
| 20 | steps: | ||
| 21 | - uses: actions/checkout@v4 | ||
| 22 | # psql is supplied by the Ubuntu runner image. A failed check uses the | ||
| 23 | # repository's Actions failure notifications; no customer data is logged. | ||
| 24 | - name: Check ordinary connection headroom | ||
| 25 | run: python3 .github/scripts/check-database-capacity.py | ||
| 26 | env: | ||
| 27 | DATABASE_URL: ${{ secrets.DATABASE_URL }} | ||