fix: add pg8000 graceful shutdown on Cloud Run scale-down by panish16 · Pull Request #1669 · bcgov/STRR

panish16 · 2026-05-27T18:01:59Z

Summary

Registers a SQLAlchemy connect event listener on app startup that wraps each pg8000 connection's close() to suppress pg8000.exceptions.InterfaceError during Cloud Run scale-down
Fixes intermittent pg8000.exceptions.InterfaceError: network error logged when Cloud Run terminates idle instances and SQLAlchemy's connection pool teardown tries to close already-severed sockets
strr-email and strr-pay connect via Unix socket (no Cloud SQL Connector dependency), so the listener is implemented inline using the same logic

Services fixed

queue_services/strr-email/src/strr_email/__init__.py
queue_services/strr-pay/src/strr_pay/__init__.py

Test plan

Confirm no new pg8000.exceptions.InterfaceError entries in GCP Log Explorer for bcrbk9-prod project after deployment
Existing unit and integration test suites pass

…email and strr-pay

…ure status code

sonarqubecloud · 2026-06-11T15:31:28Z

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

Jacky-Pham

LGTM

jimmypalelil · 2026-06-11T23:39:36Z

@@ -1,4 +1,186 @@
-# This file is automatically @generated by Poetry 2.3.4 and should not be changed by hand.
+# This file is automatically @generated by Poetry 2.3.2 and should not be changed by hand.


poetry version is mismatched. is that intended?

Not intentional — the lockfile was regenerated with my local Poetry 2.3.2 when I added the cloud-sql-connector dependency. The 2.3.4 header was from the previous lockfile. The lock content (packages and hashes) is the same; only the generator version comment in line 1 differs. I can upgrade Poetry locally to 2.3.4 and regenerate if you'd prefer consistency.

jimmypalelil · 2026-06-11T23:39:52Z

@@ -1,4 +1,186 @@
-# This file is automatically @generated by Poetry 2.3.4 and should not be changed by hand.
+# This file is automatically @generated by Poetry 2.3.2 and should not be changed by hand.


same comment here as above about the poetry version

Same as above — same unintentional regeneration with local Poetry 2.3.2. Content is correct.

jimmypalelil · 2026-06-11T23:40:34Z

 # Path to sources
 #sonar.sources=strr-api/src/**/*
-sonar.exclusions=strr-api/migrations/**/*,strr-api/devops/**/*,strr-api/tests/**/*,testing/**/*
+sonar.exclusions=strr-api/migrations/**/*,strr-api/devops/**/*,strr-api/tests/**/*,testing/**/*,queue_services/**/tests/**/*


whats the reason for adding this?

SonarCloud was picking up the new test files added under queue_services/ as source files and reporting 0% coverage on them (the main SonarCloud scan doesn't run the queue_services test suites separately). Without the exclusion, the quality gate would flag those test files as unmeasured source. This follows the same pattern as the existing testing/**/* exclusion already in the file.

jimmypalelil · 2026-06-11T23:42:51Z

hey @panish16 thanks for integrating the cloud-sql-connector lib. Its only applied to couple python proejcts. Should it not be applied to all that depend on the DB?

jimmypalelil · 2026-06-11T23:48:40Z

    assert stored.meta_data["email_type"] == "STRATA_HOTEL_REGISTRATION_ACTIVE"
+
+
+def test_email_no_cloud_event_data(client, queue_envelope, simple_cloud_event):


what are these unit & integration tests added for in this project?

wasnt it already at 100% coverage?

These tests cover the new setup_pg8000_close_event_listener(db.engine) call added to create_app() in __init__.py. Without them, the 3 new lines in that function would be uncovered, dropping coverage below 100% and failing the SonarCloud gate.

panish16 · 2026-07-01T16:57:57Z

@jimmypalelil Good question! To clarify why the fix is scoped to just strr-email and strr-pay:

strr-api — uses psycopg2 in production (the base Config class sets postgresql+psycopg2://...). Only the Migration config class uses pg8000, and migrations are short-lived (run to completion, no idle pool). So strr-api is not affected by the Cloud Run idle scale-down / pg8000 InterfaceError issue.
jobs/* — batch jobs that run to completion and exit cleanly. Cloud Run terminates them normally, not via idle scale-down, so the connection pool teardown issue does not apply.
queue_services/batch-permit-validator — has pg8000 in its deps transitively but does not initialize a SQLAlchemy engine in create_app(); no pool to attach the listener to.

strr-email and strr-pay are the only long-running Cloud Run services that hold a pg8000 connection pool while idling between queue messages, which is exactly where the Cloud Run scale-down kills the socket before SQLAlchemy can close it cleanly.

Fixes version mismatch flagged in PR review — lockfiles were previously regenerated with local Poetry 2.3.2 instead of the expected newer version.

sonarqubecloud · 2026-07-01T17:10:18Z

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

panish16 requested review from Jacky-Pham, JazzarKarim, dimak1 and thorwolpert as code owners May 27, 2026 19:41

panish16 changed the title ~~fix: add pg8000 graceful shutdown on Cloud Run scale-down~~ [DRAFT] - fix: add pg8000 graceful shutdown on Cloud Run scale-down May 27, 2026

panish16 changed the title ~~[DRAFT] - fix: add pg8000 graceful shutdown on Cloud Run scale-down~~ fix: add pg8000 graceful shutdown on Cloud Run scale-down Jun 8, 2026

panish16 force-pushed the fix/pg8000-graceful-shutdown branch from 09921be to 2b071bb Compare June 8, 2026 23:06

panish16 mentioned this pull request Jun 10, 2026

bcgov/STRR - strr-email, strr-pay bcgov/entity#33739

Open

fix: add pg8000 graceful shutdown using cloud-sql-connector for strr-…

3780bf5

…email and strr-pay

panish16 force-pushed the fix/pg8000-graceful-shutdown branch from 2b071bb to 3780bf5 Compare June 10, 2026 21:38

panish16 requested a review from jimmypalelil as a code owner June 10, 2026 21:38

panish16 added 2 commits June 10, 2026 14:53

fix: add session fixture to integration tests and correct notify fail…

da08ad1

…ure status code

fix: apply black formatting to test_email_listener_utils

c690e57

Jacky-Pham approved these changes Jun 11, 2026

View reviewed changes

dimak1 approved these changes Jun 11, 2026

View reviewed changes

jimmypalelil reviewed Jun 11, 2026

View reviewed changes

chore: regenerate poetry.lock files with Poetry 2.4.1

3d89e47

Fixes version mismatch flagged in PR review — lockfiles were previously regenerated with local Poetry 2.3.2 instead of the expected newer version.

		@@ -1,4 +1,186 @@
		# This file is automatically @generated by Poetry 2.3.4 and should not be changed by hand.
		# This file is automatically @generated by Poetry 2.3.2 and should not be changed by hand.

		assert stored.meta_data["email_type"] == "STRATA_HOTEL_REGISTRATION_ACTIVE"


		def test_email_no_cloud_event_data(client, queue_envelope, simple_cloud_event):

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Conversation

panish16 commented May 27, 2026

Summary

Services fixed

Test plan

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sonarqubecloud Bot commented Jun 11, 2026

Quality Gate passed

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jimmypalelil commented Jun 11, 2026

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panish16 commented Jul 1, 2026

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sonarqubecloud Bot commented Jul 1, 2026

Quality Gate passed

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