fix(pgdelta): force close event loop on success path#5714
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… output `supabase db schema declarative sync` could hang indefinitely at 0% CPU after all migrations were applied to the shadow database (supabase/pg-toolbelt#312). Root cause: the pg-delta Deno scripts run inside a one-shot Edge Runtime container and rely on the event loop draining for the worker to be destroyed and the container to exit. The catalog-export script opens a real connection pool (createManagedPool); when a keepalive handle lingers after close() resolves, the worker never exits, so the container never stops. The CLI streams that container's logs with Follow:true (DockerStreamLogs), so a worker that never exits blocks the parent `__catalog` subprocess — and the declarative-sync command that spawned it — forever. Only the error path force-closed the loop (`throw new Error("")`); the success path did not. Fix: force-close the event loop on the success path of every pg-delta Edge Runtime script (diff, declarative-export, catalog-export, and declarative-apply), so the worker is torn down deterministically once output has been flushed. The output is written synchronously before the throw, and RunEdgeRuntimeScript already tolerates the resulting "main worker has been destroyed" exit. Reproduced against supabase/edge-runtime:v1.74.2: a worker with a lingering handle keeps the container `running` and `docker logs -f` (the equivalent of DockerStreamLogs Follow:true) never returns; adding the force-close makes the container exit immediately with output intact. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01XbxecW4DVmwgQB1YX321K3
Supabase CLI previewnpx --yes https://pkg.pr.new/supabase/cli/supabase@7908b637a4d41d575eb687fa2ae15cadce589123Preview package for commit |
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| scripts := map[string]string{ | ||
| "pgdelta.ts": pgDeltaScript, | ||
| "pgdelta_declarative_export.ts": pgDeltaDeclarativeExportScript, | ||
| "pgdelta_catalog_export.ts": pgDeltaCatalogExportScript, | ||
| } |
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When pg-delta catalog caching is enabled, pgcache.TryCacheMigrationsCatalog still runs the separate pgDeltaCatalogExportTS script in apps/cli-go/internal/db/pgcache/cache.go through RunEdgeRuntimeScript; that script uses the same createManagedPool/extractCatalog/close() pattern but still ends after await close() with no final force-close throw. Because this new coverage only checks the three diff-package templates, the hang fixed here can still occur on the migrations-catalog cache path, such as db start/db push with pg-delta caching enabled. Please update that template and cover it as well.
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Good catch — fixed. pgDeltaCatalogExportTS in internal/db/pgcache/cache.go (the db start / db push migrations-catalog cache path) had the same createManagedPool/close() pattern with no success-path force-close. Added the force-close there plus a cache_template_test.go guard, matching the other four scripts. Pushed in 7908b63.
Generated by Claude Code
The migrations-catalog cache script (pgcache.TryCacheMigrationsCatalog, used by db start / db push with pg-delta caching) uses the same createManagedPool/extractCatalog/close() pattern as the other pg-delta Edge Runtime scripts and had the same missing success-path force-close, so it could hang the same way (supabase/pg-toolbelt#312). Add the force-close and a guard test. Flagged by automated PR review. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01XbxecW4DVmwgQB1YX321K3
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Fixes a hang where
supabase db schema declarative sync(and other pg-delta flows) stop responding indefinitely at 0% CPU after work completes.Fixes supabase/pg-toolbelt#312
Problem
The pg-delta scripts run inside a one-shot Edge Runtime container and rely on the event loop draining for the worker to be destroyed and the container to exit. The catalog-export script opens a real connection pool (
createManagedPool); when a keepalive handle lingers afterclose()resolves, the worker never exits, so the container never stops. Because the CLI streams that container's logs withFollow:true(DockerStreamLogs), a worker that never exits blocks the parent__catalogsubprocess — and the declarative-sync command that spawned it — forever. Only the error path force-closed the loop viathrow new Error(""); the success path did not.This was reproduced against
supabase/edge-runtime:v1.74.2: a worker left with a lingering handle keeps the containerrunninganddocker logs -f(the equivalent ofDockerStreamLogswithFollow:true) never returns; adding the force-close makes the container exit immediately with its output intact. A large (~1.26 MB) stdout payload on its own does not reproduce the hang — the trigger is the non-exiting worker, not output size.Solution
Force-close the event loop on the success path of every pg-delta Edge Runtime script, so the worker is torn down deterministically once output has been flushed (output is written synchronously before the throw, and
RunEdgeRuntimeScriptalready tolerates the resultingmain worker has been destroyedexit):pgdelta_catalog_export.ts— catalog snapshot export (the path reported in test: secret list command #312)pgdelta.ts— diff SOURCE→TARGETpgdelta_declarative_export.ts— declarative file exportpgdelta_declarative_apply.ts— apply declarative schemaThe catalog-export script is the only one that always holds a live pool, but the diff/export/apply scripts open connections too when given live database URLs, so all four are covered. Error paths are unchanged.
Changes
legacy-pgdelta.deno-templates.ts.pgdelta_template_test.go,pgdelta_apply_template_test.go) asserting each script's success path ends with the force-close.https://claude.ai/code/session_01XbxecW4DVmwgQB1YX321K3