UN-3561 [FEAT] PG Queue 9e PR 2a — live-PG-pipeline inert foundation (dispatch backend override + barrier decrement core) by muhammad-ali-e · Pull Request #2067 · Zipstack/unstract

muhammad-ali-e · Jun 17, 2026

What

First slice of 9e PR 2 (the live PG execution pipeline), split into 2a → 2b → 2c. This is 2a, the inert foundation — the two seams the live switch (2c) consumes, each with zero behaviour change on the default path.

1. `dispatch(backend=...)` — per-call transport override

dispatch() gains an optional backend: QueueBackend | None = None:

None (the default, and every call site today) → transport is the env allow-list decision via select_backend() — byte-identical to today.
Set → it wins over the allow-list. This is the seam the execution-level PG pipeline (2c) uses to route a whole execution's header/callback dispatches onto PG without opting their task names into WORKER_PG_QUEUE_ENABLED_TASKS. The allow-list is for leaf tasks; the coupled pipeline's migration unit is the execution (carried in the payload — see routing.py).

2. Extract `_barrier_pg_decrement(...)` core

The decrement logic moves out of the @worker_task barrier_pg_decr_and_check into a plain _barrier_pg_decrement(...) function; the @worker_task becomes a thin delegator. The plain core is what 2c calls in-body on the PG-consumed path — a PG-consumed task fires no Celery .link, so the decrement must run in-body (fire-and-forget self-chaining). Behaviour for the existing Celery .link path is unchanged (the wrapper forwards verbatim).

Why it's inert

Default barrier backend is chord → Celery executions never import the PgBarrier module, so the extraction is invisible to them.
No call site passes backend= → the Celery dispatch path is byte-identical.
Net behaviour change: NONE. Transport threading into the fan-out fns + the live transport=="pg_queue" switch land in 2c (threading an unused param earlier just trips S1172); per-batch idempotency lands in 2b.

Tests

dispatch backend-override (3): PG-forces-PG-without-allow-list, Celery-forces-Celery-despite-allow-list, default-None-preserves-allow-list.
decrement-core extraction (3): core is a plain callable (not a Celery task), runs the decrement in-body against real PG, and the @worker_task delegates verbatim.
Full test_pg_barrier (33) + test_dispatch_pg (10) + barrier/routing (53) suites green; ruff clean.
Worker-app bootstrap verified clean under WORKER_BARRIER_BACKEND=pg: both barrier tasks registered under canonical names, get_barrier() → PgBarrier.

Base

Targets the long-lived feat/UN-3445-pg-queue-integration integration branch (not main).

🤖 Generated with Claude Code

…(dispatch backend override + barrier decrement core) First slice of 9e PR 2 (the live PG execution pipeline), split 2a/2b/2c. 2a is the inert foundation: the two seams the live switch (2c) consumes, each with zero behaviour change on the default path. - dispatch(backend=...): per-call transport override. None (default, every call site today) keeps the env allow-list decision via select_backend — byte-identical. When set it wins over the allow-list, so 2c can route a whole execution's header/callback onto PG without opting their task names into WORKER_PG_QUEUE_ENABLED_TASKS (allow-list is for leaf tasks; the pipeline's migration unit is the execution). - Extract _barrier_pg_decrement(...) plain core out of the @worker_task barrier_pg_decr_and_check (now a thin delegator). 2c calls the core in-body on the PG-consumed path (a PG-consumed task fires no Celery .link, so the decrement runs in-body — fire-and-forget self-chaining). Inert by construction: default barrier backend is chord (Celery executions never import the PgBarrier module), and no call site passes backend=. Net behaviour change: NONE. Transport threading + live switch land in 2c; per-batch idempotency in 2b. Tests: dispatch backend-override (3) + decrement-core extraction (3, incl. real-PG in-body decrement + verbatim delegation). pg_barrier/dispatch/ barrier/routing suites green; ruff clean; worker-app bootstrap clean under WORKER_BARRIER_BACKEND=pg (both barrier tasks registered, get_barrier→PgBarrier). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

coderabbitai · Jun 17, 2026

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muhammad-ali-e

PR Review Toolkit — automated review (6 agents)

Reviewed by Code Reviewer, Silent Failure Hunter, Type Design Analyzer, PR Test Analyzer, Comment Analyzer, and Code Simplifier against base feat/UN-3445-pg-queue-integration.

Verdict: no blocking issues. The _barrier_pg_decrement extraction is byte-for-byte faithful (verified via git show), the Celery wrapper delegates verbatim with max_retries=0 preserved, and the backend override is correctly inert with no live caller. Code Reviewer and Code Simplifier found nothing to change.

8 inline findings below — all MEDIUM/LOW (nice-to-have before the 2c follow-up lands a real caller). Priority order:

MEDIUM — _barrier_pg_decrement's "own committed transaction / no retry" contract is doc-only; a future in-body caller can silently corrupt the count. (pg_barrier.py:268)
MEDIUM — override + fairness/priority interaction is untested, yet that's the override's whole reason to exist. (test_dispatch_pg.py:124)
MEDIUM — delegation test is a mock-tautology; strengthen to a DB-backed equivalence check. (test_pg_barrier.py:353)
MEDIUM — docstring cross-ref mismatch + term overload: "carried in the payload" vs routing.py's ExecutionContext. (dispatch.py:95)
LOW — comment inaccuracy: "one call = one _cursor() txn" (actually up to two). (pg_barrier.py:268)
LOW — type: backend: QueueBackend | None overloads None as a third AUTO state. (dispatch.py:80)
LOW — type: untyped dict[str, Any] return vs the typed CallbackDescriptor input. (pg_barrier.py:249)
LOW — rot-prone comment describing a not-yet-existent 2c mechanism. (pg_barrier.py:266)

…esolve_backend helper, comment/test fixes - pg_barrier: enforce the "own committed transaction" decrement contract loudly — _barrier_pg_decrement raises at entry if the shared connection is mid-transaction (was prose-only; the 2c in-body caller is the real risk). Safe for existing paths: Celery .link enters idle, tests use autocommit conns → always idle. Fix the inaccurate "one call = one _cursor() txn" parenthetical (the delete paths open a 2nd txn) and drop the rot-prone "(fire-and-forget self-chaining)" jargon. - routing: extract resolve_backend(task_name, override) — the override-wins- else-allow-list precedence now lives in one self-documenting place (2c reuses it); dispatch() calls it instead of inlining the None-means-auto rule. - dispatch: reword the backend= docstring — avoid the "payload" term collision (local to_payload var) and the stale routing.py cross-ref; point at the live carrier WorkflowContextData.transport + 9e-design.md. - tests: +fairness-reaches-row on the backend= override path; +real-row wrapper test that catches core-param drift (the mocked delegation test couldn't); +open-transaction guard test. Kept the mocked test as the keyword-forwarding pin. Deferred (LOW, reviewer-aligned): BarrierDecrementResult TypedDict union — lands in 2c when the in-body caller actually branches on the status. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

muhammad-ali-e · Jun 17, 2026

Review round addressed — `e84df69c4`

Thanks @muhammad-ali-e. All 8 threads handled — 6 fixed, 1 deferred (reviewer-aligned), 1 positive/noted.

Fixed

[MED] in-transaction enforcement (pg_barrier:268a) — the "own committed transaction" contract is now enforced loudly: _barrier_pg_decrement raises at entry if the shared connection is mid-transaction. Safe for every existing path (Celery .link enters idle; tests use autocommit conns) — trips only on the 2c misuse. + test_open_transaction_on_shared_conn_raises.
[LOW] comment accuracy (pg_barrier:268b) — scoped the "one _cursor() txn" parenthetical to the decrement UPDATE (the delete paths open a 2nd).
[LOW] comment rot (pg_barrier:266) — dropped "(fire-and-forget self-chaining)"; softened to clearly-future framing.
[MED] comment accuracy (dispatch:95) — reworded to avoid the payload term collision + the stale routing.py cross-ref; points at the live carrier WorkflowContextData.transport + 9e-design.md. (Note: the literal "ExecutionContext" suggestion would itself be inaccurate under the payload-carry design — see the thread.)
[LOW] type design (dispatch:80) — extracted resolve_backend(task_name, override) into routing.py; the None-means-auto precedence now lives in one reusable place (2c shares it).
[MED] test gap (test_dispatch:124) — test_override_path_carries_fairness_to_row: asserts org/priority reach the row on the backend= path.
[MED] test quality (test_pg_barrier:353) — added a real-row wrapper test that catches core-param drift (core not mocked); kept the mocked test as the explicit keyword-forwarding pin.

Deferred (your call, LOW)

BarrierDecrementResult(TypedDict) union (pg_barrier:250) → 2c, where the in-body caller actually branches on status and the shape firms up.

Verification: test_pg_barrier + test_dispatch_pg + test_routing + test_barrier_backend_selection = 76 green; ruff clean; worker-app bootstrap clean under WORKER_BARRIER_BACKEND=pg (both barrier tasks registered, get_barrier() → PgBarrier, resolve_backend precedence verified). Still inert — net behaviour change on the default path: NONE.

greptile-apps · Jun 17, 2026

Greptile Summary

This PR is the first slice of the live PG execution pipeline (9e PR 2a), introducing two inert seams consumed by the upcoming PR 2c — a per-call backend= override on dispatch() and a plain _barrier_pg_decrement core extracted from the @worker_task wrapper. No existing call site passes backend=, so the default path is byte-identical to the previous code.

dispatch() backend override: a new optional backend: QueueBackend | None = None parameter routes a task to a specific transport regardless of the env allow-list; resolve_backend() in routing.py encapsulates the override-wins-else-allow-list precedence in a single, testable function.
_barrier_pg_decrement extraction: moves the atomic decrement logic out of the @worker_task into a plain callable so the PG-consumed pipeline path (2c) can call it in-body (PG-consumed tasks fire no .link). A new transaction-status guard raises loudly if entered mid-transaction, making the "own committed transaction" contract enforced at runtime rather than only in prose.

Confidence Score: 5/5

Safe to merge — the default path is byte-identical to before, and the two new seams are thoroughly guarded and tested.

Both changes are structurally inert: every existing dispatch() call passes backend=None, routing through the unchanged select_backend allow-list path; the _barrier_pg_decrement extraction preserves all logic verbatim and adds a runtime guard that only rejects callers already in an open transaction. The transaction-status guard is a net safety improvement over the previous design.

No files require special attention.

Important Files Changed

Filename	Overview
workers/queue_backend/dispatch.py	Adds optional `backend: QueueBackend
workers/queue_backend/pg_barrier.py	Extracts decrement logic into `_barrier_pg_decrement` plain function; `barrier_pg_decr_and_check` becomes a thin `@worker_task` delegator. Adds `psycopg2.extensions` import and an explicit transaction-status guard that raises `RuntimeError` if entered mid-transaction, enforcing the "own committed transaction" contract loudly. All existing logic preserved exactly.
workers/queue_backend/routing.py	Adds `resolve_backend(task_name, override)` — one-liner that returns `override` when set, else defers to `select_backend`. Scaffold-posture docstring updated to name the correct seam function.
workers/tests/test_dispatch_pg.py	Adds `TestDispatchBackendOverride` with 4 tests: PG override forces PG, Celery override forces Celery despite allow-list, None preserves allow-list, fairness plumbing carried on the override path. Good coverage of new seam.
workers/tests/test_pg_barrier.py	Adds `TestDecrementCoreExtraction` with 5 tests: core is not a Celery task, core decrements against real DB, wrapper produces same decrement as core (no-drift guard), wrapper forwards kwargs verbatim, open-transaction guard raises before touching the DB.

Sequence Diagram

%%{init: {'theme': 'neutral'}}%%
sequenceDiagram
    participant Caller
    participant dispatch
    participant resolve_backend
    participant select_backend
    participant _enqueue_pg
    participant Celery

    Caller->>dispatch: "dispatch(task_name, backend=None)"
    dispatch->>resolve_backend: resolve_backend(task_name, None)
    resolve_backend->>select_backend: select_backend(task_name)
    select_backend-->>resolve_backend: QueueBackend.CELERY (default)
    resolve_backend-->>dispatch: QueueBackend.CELERY
    dispatch->>Celery: send_task(...) [unchanged path]

    Note over Caller,Celery: 2c pipeline path (future)
    Caller->>dispatch: "dispatch(task_name, backend=QueueBackend.PG)"
    dispatch->>resolve_backend: resolve_backend(task_name, QueueBackend.PG)
    resolve_backend-->>dispatch: QueueBackend.PG (override wins)
    dispatch->>_enqueue_pg: _enqueue_pg(...)
    _enqueue_pg-->>Caller: PgDispatchHandle

    Note over Caller,Celery: barrier decrement paths
    Celery->>barrier_pg_decr_and_check: .link callback
    barrier_pg_decr_and_check->>_barrier_pg_decrement: delegate (guard: idle conn)
    _barrier_pg_decrement-->>barrier_pg_decr_and_check: result

    Note over Caller,Celery: 2c in-body path (future)
    Caller->>_barrier_pg_decrement: direct call (guard: idle conn)
    _barrier_pg_decrement-->>Caller: result

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sequenceDiagram
    participant Caller
    participant dispatch
    participant resolve_backend
    participant select_backend
    participant _enqueue_pg
    participant Celery

    Caller->>dispatch: "dispatch(task_name, backend=None)"
    dispatch->>resolve_backend: resolve_backend(task_name, None)
    resolve_backend->>select_backend: select_backend(task_name)
    select_backend-->>resolve_backend: QueueBackend.CELERY (default)
    resolve_backend-->>dispatch: QueueBackend.CELERY
    dispatch->>Celery: send_task(...) [unchanged path]

    Note over Caller,Celery: 2c pipeline path (future)
    Caller->>dispatch: "dispatch(task_name, backend=QueueBackend.PG)"
    dispatch->>resolve_backend: resolve_backend(task_name, QueueBackend.PG)
    resolve_backend-->>dispatch: QueueBackend.PG (override wins)
    dispatch->>_enqueue_pg: _enqueue_pg(...)
    _enqueue_pg-->>Caller: PgDispatchHandle

    Note over Caller,Celery: barrier decrement paths
    Celery->>barrier_pg_decr_and_check: .link callback
    barrier_pg_decr_and_check->>_barrier_pg_decrement: delegate (guard: idle conn)
    _barrier_pg_decrement-->>barrier_pg_decr_and_check: result

    Note over Caller,Celery: 2c in-body path (future)
    Caller->>_barrier_pg_decrement: direct call (guard: idle conn)
    _barrier_pg_decrement-->>Caller: result

_{Reviews (3): Last reviewed commit: "UN-3561 address greptile (3× P2): docstr..." | Re-trigger Greptile}

…ssion note All doc/comment-only, no logic change. greptile gave 4/5 "safe to merge"; these are the staleness its findings flagged, introduced by the resolve_backend extraction in the prior review round: - dispatch module docstring + routing "Scaffold posture" now name resolve_backend (wrapping select_backend) as the routing seam, not select_backend alone. - Note at the _pg_routing_logged log-once site that it's keyed on task name only, so an override-then-allow-list cutover won't re-announce (benign: override = pipeline headers vs allow-list = leaf tasks, no overlap expected; the allow-list config is still announced by _log_allow_list_once). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

muhammad-ali-e · Jun 17, 2026

@greptile-apps round addressed — `345933ee1`

Thanks for the 4/5 + the flowchart. All 3 "Comments Outside Diff" (P2) fixed — each was staleness introduced by the resolve_backend extraction in the previous review round, so good catches:

dispatch.py docstring (L3) — now reads "Routes each task to its transport via resolve_backend (which applies a per-call backend override, else defers to select_backend)", and the PG bullet mentions the backend= override path.
routing.py "Scaffold posture" (L36-40) — the seam sentence now names resolve_backend() (wrapping the select_backend() allow-list with the per-call override) as where real PG dispatch lands.
_pg_routing_logged suppression (L127-138) — added the call-out you suggested: the set is keyed on task name only, so an override-then-allow-list cutover won't re-announce. Benign given the usage split (override = pipeline headers, allow-list = leaf tasks → no overlap expected), and the allow-list config itself is still announced by _log_allow_list_once.

No logic changed (doc/comment only). 30 dispatch+routing tests green, ruff clean.

sonarqubecloud · Jun 17, 2026

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

…g_batch_dedup + claim_batch / clear_execution_batches) Second slice of 9e PR 2, after 2a (#2067). Inert idempotency primitive: the durable per-batch dedup marker 2c wires into the at-least-once PG path. Why: the PG queue is at-least-once, so process_file_batch can be redelivered after a crash-before-ack → re-run batch + double-decrement the barrier (non-idempotent, max_retries=0). Recon showed existing per-file protection is only partial (Redis lock released after write; WFE COMPLETED skips tool re-exec but not necessarily the destination write; FileHistory is cross-execution only), so a durable per-batch gate is needed; per-file status stays the partial-crash backstop. - backend: PgBatchDedup model + migration 0006 — table pg_batch_dedup with a UniqueConstraint(execution_id, batch_index) (the ON CONFLICT target; its execution_id-leading index also serves the cleanup DELETE). Django-managed, extension-free, same posture as the sibling pg_queue models. - workers (pg_barrier.py, reusing the barrier's _cursor() → one PG conn per worker child): claim_batch(execution_id, batch_index) -> bool (atomic INSERT ... ON CONFLICT DO NOTHING RETURNING; True=first/decrement, False=redelivery/skip) + clear_execution_batches(execution_id) -> int (barrier-teardown cleanup; reaper sweep is the backstop). No call-site wiring — claim/clear + batch_index threading + transport switch land in 2c. Inert: new table + two helpers, no callers. Net behaviour: NONE. Tests: +8 real-PG (first-claim, redelivery-rejected, distinct-batch, distinct-exec, concurrent-exactly-one-winner, clear-only-target, clear-empty-zero, reclaim-after-clear). Migration applied to dev DB, makemigrations --check clean, bootstrap clean under WORKER_BARRIER_BACKEND=pg. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

…g_batch_dedup + claim_batch / clear_execution_batches) (#2068) * UN-3562 [FEAT] PG Queue 9e PR 2b — per-batch idempotency primitive (pg_batch_dedup + claim_batch / clear_execution_batches) Second slice of 9e PR 2, after 2a (#2067). Inert idempotency primitive: the durable per-batch dedup marker 2c wires into the at-least-once PG path. Why: the PG queue is at-least-once, so process_file_batch can be redelivered after a crash-before-ack → re-run batch + double-decrement the barrier (non-idempotent, max_retries=0). Recon showed existing per-file protection is only partial (Redis lock released after write; WFE COMPLETED skips tool re-exec but not necessarily the destination write; FileHistory is cross-execution only), so a durable per-batch gate is needed; per-file status stays the partial-crash backstop. - backend: PgBatchDedup model + migration 0006 — table pg_batch_dedup with a UniqueConstraint(execution_id, batch_index) (the ON CONFLICT target; its execution_id-leading index also serves the cleanup DELETE). Django-managed, extension-free, same posture as the sibling pg_queue models. - workers (pg_barrier.py, reusing the barrier's _cursor() → one PG conn per worker child): claim_batch(execution_id, batch_index) -> bool (atomic INSERT ... ON CONFLICT DO NOTHING RETURNING; True=first/decrement, False=redelivery/skip) + clear_execution_batches(execution_id) -> int (barrier-teardown cleanup; reaper sweep is the backstop). No call-site wiring — claim/clear + batch_index threading + transport switch land in 2c. Inert: new table + two helpers, no callers. Net behaviour: NONE. Tests: +8 real-PG (first-claim, redelivery-rejected, distinct-batch, distinct-exec, concurrent-exactly-one-winner, clear-only-target, clear-empty-zero, reclaim-after-clear). Migration applied to dev DB, makemigrations --check clean, bootstrap clean under WORKER_BARRIER_BACKEND=pg. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * UN-3562 address review (muhammad-ali-e P1-P8): fix reaper-backstop docstring claim, batch_index constraint, race test, nits - P1 (verified bug): the docstrings claimed the reaper's barrier-orphan sweep reclaims orphaned pg_batch_dedup markers — it doesn't. sweep_expired_barriers DELETEs only pg_barrier_state (no cascade), so orphaned markers leak today. Reworded both PgBatchDedup + clear_execution_batches docstrings to state the leak honestly + flag the dedup-orphan sweep as intended future work. - P4: add CheckConstraint(batch_index >= 0) (writer-proof, mirrors PgQueueMessage.priority) + a test that the DB rejects a negative index. Regenerated migration 0006 to include it. - P6: claim_batch docstring no longer says it decrements; defers the single decrement to the caller (the function only inserts the marker). - P7: generalized "partial per-file protection" → "not fully idempotent on redelivery" so the rationale can't rot. - P5: documented created_at as observability-only (future age-based sweep). - P2: REQUIRE_PG_TESTS env → skip becomes fail, so the idempotency primitive can't ship untested-green in CI where PG is expected. - P3: strengthened the race test — pre-build N=8 conns in the main thread, align claims with threading.Barrier, loop 5 trials (forces the contended ON CONFLICT path instead of a serial fast-path). - P8: hoisted import os to module top. 35 pg_barrier + 9 dedup tests green; migration applied to dev DB, makemigrations --check clean; ruff clean. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

muhammad-ali-e commented Jun 17, 2026

View reviewed changes

muhammad-ali-e marked this pull request as ready for review June 17, 2026 07:37

muhammad-ali-e merged commit 59716f5 into feat/UN-3445-pg-queue-integration Jun 17, 2026
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muhammad-ali-e deleted the UN-3561-pg-pipeline-2a-foundation branch June 17, 2026 08:00

muhammad-ali-e mentioned this pull request Jun 17, 2026

UN-3562 [FEAT] PG Queue 9e PR 2b — per-batch idempotency primitive (pg_batch_dedup + claim_batch / clear_execution_batches) #2068

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muhammad-ali-e mentioned this pull request Jun 17, 2026

UN-3563 [FEAT] PG Queue 9e PR 2c — live PG fan-out/barrier/callback (fire-and-forget) #2069

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muhammad-ali-e commented Jun 17, 2026

What

1. dispatch(backend=...) — per-call transport override

2. Extract _barrier_pg_decrement(...) core

Why it's inert

Tests

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muhammad-ali-e commented Jun 17, 2026

Review round addressed — e84df69c4

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Greptile Summary

Confidence Score: 5/5

Important Files Changed

Sequence Diagram

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muhammad-ali-e commented Jun 17, 2026

@greptile-apps round addressed — 345933ee1

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sonarqubecloud Bot commented Jun 17, 2026

Quality Gate passed

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1. `dispatch(backend=...)` — per-call transport override

2. Extract `_barrier_pg_decrement(...)` core

coderabbitai Bot commented Jun 17, 2026 •

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Review round addressed — `e84df69c4`

greptile-apps Bot commented Jun 17, 2026 •

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@greptile-apps round addressed — `345933ee1`