translate_bq_error previously mapped BQ's responseTooLarge failure mode
to bq_bad_request (HTTP 400 with the raw upstream message). The user-
facing implication ('your SQL has a syntax error') is wrong -- the root
cause is query shape (BQ refused to return the result inline because
it exceeded the response size limit), and the actionable remediation is
'narrow the WHERE clause, aggregate further, or use a materialized
table'.
Add bq_response_too_large as a first-class BqAccessError kind (also 400)
with a canonical hint message; original BQ message preserved in details
for operator debugging. Detection is substring-based on 'response too
large' and fires before the generic BadRequest path so the dedicated
mapping always wins. Affects every BQ-touching path since they all
share translate_bq_error -- /api/query, /api/v2/{scan,sample,schema},
materialize.
Each BqAccess.duckdb_session() acquire previously created a fresh
in-memory DuckDB conn and ran INSTALL bigquery; LOAD bigquery;
CREATE SECRET; ATTACH on it -- costing ~0.5 s per request even before
any BQ work. Add a process-local pool (deque + lock) of pre-warmed
sessions; acquire reuses a warm entry when available, refreshing the
auth SECRET so a long-lived pool entry doesn't keep a stale GCE
metadata token past its TTL. Liveness probe (cheap SELECT 1) drops
broken entries before handing them to callers.
On exception inside the with-block the conn is closed instead of
returned to pool (session may carry dirty state). Pool size is
data_source.bigquery.session_pool_size (default 4; sentinel 0
disables pooling). Process-cached, not fork-safe (single uvicorn
worker is the supported deployment shape per CLAUDE.md).
All call sites get faster automatically: /api/query, /api/v2/{scan,
sample,schema}, materialize, the orchestrator's remote-attach, and
the BQ dry-run cap-guard.
* docs(spec): #134 unify BigQuery access behind BqAccess facade
Brainstorm output for issue #134. Captures:
- root cause (incl. correction of the issue's hypothesis about commit 33a9964)
- BqAccess facade API + project resolution rules
- error contract — typed BqAccessError mapped to HTTP 502 for upstream
BQ failures, 500 for deployment/config bugs
- migration plan for v2_scan, v2_sample, RemoteQueryEngine
- test rewrite eliminating _bq_client_factory injection point
- E2E verification protocol on agnes-development as success criterion
* docs(spec): #134 revise after first review
Incorporates code-reviewer findings:
Must-fix:
- Add v2_schema (2 copies of INSTALL/LOAD/SECRET dance) to migration scope.
- Reframe v2_scan headline: missing try/except around BQ calls is the
actual cause of bare 500s, not project resolution (which 33a9964 fixed).
- List two more deferred call sites (extractor.py, register_bq_table)
with explicit rationale.
Important:
- Drop billing != data clause from cross_project_forbidden heuristic;
rely only on 'serviceusage' substring. billing != data is normal
for cross-project setup, was over-classifying.
- Split bq_bad_request into _user (400) and _server (502) variants;
add sql_origin parameter to translate_bq_error so call sites declare
whether SQL contains user input.
- Add @functools.cache to BqAccess.from_config; document tests bypass
via dependency_overrides.
- Replace monkey-patched-classmethod test pattern with
BqAccess(client_factory=...) injection at construction time. Cleaner
than today's _bq_client_factory and 1:1 migration shape.
- Keep BqProjects.data (reviewer assumed registry has source_project;
it doesn't). Multi-project explicitly listed as non-goal with note.
Nice-to-have:
- Add 'Implementation strategy' section: 2 staged commits (bug fix
alone is revertable; refactor follows).
- Extend E2E protocol to cover all three endpoints, not just /sample.
- Note removal of stale docstring at src/remote_query.py:204.
* docs(spec): #134 revision 3 — incorporates second-round review
Must-fix from second review:
- v2_schema split into two migration cases: _fetch_bq_schema translates
errors via translate_bq_error; _fetch_bq_table_options preserves its
swallow-all 'except Exception → return {}' so /schema doesn't 502 on
partition-info failures.
- RemoteQueryEngine.__init__ now resolves BqAccess lazily (in
_get_bq_client, not in __init__). Without this, ~7 DuckDB-only tests
in test_remote_query.py would suddenly fail with not_configured.
- translate_bq_error pass-through for BqAccessError is now load-bearing
(clause 1, before any Google-API branch). bq.client() raises BqAccessError
for bq_lib_missing/auth_failed; without explicit pass-through those
fall to 'unknown' and re-raise as bare 500.
- Commit 1 now emits the SAME structured response shape as commit 2 to
avoid contract churn between commits.
- BIGQUERY_PROJECT env-var precedence is BREAKING for env-only deployments
— flagged in CHANGELOG ### Changed.
Editorial:
- sql_origin renamed to bad_request_status with values 'client_error' /
'upstream_error' (clearer about what the parameter actually decides).
bq_bad_request_user/_server kinds collapsed to bq_bad_request (400)
and bq_upstream_error (502).
- CLI (cli/commands/query.py) noted as external RemoteQueryEngine caller;
unaffected because new bq_access kwarg has default None.
- Added unit/integration tests for the new contracts:
test_translate_passes_through_BqAccessError,
test_v2_scan_returns_500_on_bq_lib_missing,
test_v2_schema_returns_200_with_empty_partition_on_bq_failure,
test_resolve_succeeds_after_config_set.
- E2E protocol now covers /schema as the fourth endpoint.
- Documented functools.cache-doesn't-cache-exceptions semantics and
fixture nullcontext-doesn't-close caveat for nested sessions.
* docs(spec): #134 revision 4 — incorporates third-round review
Third reviewer verdict: 'implementation-ready with two trivial edits';
explicitly noted prior rounds did the heavy lifting.
Edits:
1. get_bq_access() module-level function instead of @classmethod
@functools.cache from_config. Removes the classmethod-cache stacking
footgun (different Python versions wrap differently) and gives FastAPI's
dependency introspection a clean function signature. Drops the
'Do not subclass BqAccess' caveat that no longer applies.
2. Commit 1 strategy explicitly: wrap _fetch_bq_sample (v2_sample),
_bq_dry_run_bytes + _run_bq_scan (v2_scan), and _fetch_bq_schema
(v2_schema strict block). Do NOT touch _fetch_bq_table_options swallow-all
in commit 1 — preserved as-is, then migrated (still preserved) in commit 2.
All three endpoints emit the same structured body shape so client parsers
see one consistent contract throughout the staged rollout. No more
half-rolled-out window where /sample is bare 500 while /scan is
structured 502.
* docs(plan): #134 implementation plan — Phase 1 (atomic bug fix) + Phase 2 (BqAccess refactor) + Phase 3 (verification)
Bite-sized TDD tasks. 3 phases, 16 tasks total:
Phase 1 (Commit 1) — atomic bug fix across all four v2 endpoints:
Tasks 1.1-1.5 wrap _fetch_bq_sample, _bq_dry_run_bytes, _run_bq_scan,
_fetch_bq_schema with structured 502/400 try/except. _fetch_bq_table_options
preserved untouched. CHANGELOG Fixed entries.
Phase 2 (Commit 2) — BqAccess facade extraction + migration:
Tasks 2.1-2.5 build connectors/bigquery/access.py bottom-up
(BqProjects, BqAccessError, translate_bq_error, default factories,
BqAccess class, get_bq_access module-level cached). Task 2.6 adds
conftest.py fixture. Tasks 2.7-2.9 migrate v2_scan, v2_sample, v2_schema
to BqAccess. Tasks 2.10-2.11 migrate RemoteQueryEngine + tests
(lazy bq_access, drop _bq_client_factory). Task 2.12 CHANGELOG
Changed BREAKING + Internal.
Phase 3 — Verification:
3.1 full pytest. 3.2 squash into two PR-shape commits. 3.3 manual
E2E on agnes-development per spec protocol → close#134.
Self-review table maps spec sections to implementing tasks; no gaps.
* fix(v2): #134 structured 502/400 on BQ errors across /scan, /scan/estimate, /sample, /schema
Wraps the BigQuery call sites in v2_scan, v2_sample, and v2_schema (strict
block only) with try/except for google.api_core exceptions, translating to
HTTPException with a structured body shape: {error, message, details}.
Fixes Pavel's report (#134) where these endpoints returned bare HTTP 500
with no body when the SA on agnes-development hit cross-project Forbidden
on serviceusage.services.use.
Also fixes /sample's missing billing_project fallback (the bug 33a9964
fixed for /scan never landed here).
Status code split:
- /scan, /scan/estimate: BadRequest -> 400 (bq_bad_request) since SQL is
user-derived from req.select/where/order_by.
- /sample, /schema: BadRequest -> 502 (bq_upstream_error) since SQL is
server-constructed from validated identifiers.
- All Forbidden -> 502 with cross_project_forbidden if 'serviceusage' in
error message (with hint pointing at data_source.bigquery.billing_project),
else bq_forbidden.
Body shape matches what the upcoming BqAccess refactor (next commit) will
produce, so client-side parsers see one consistent contract throughout
the staged rollout.
_fetch_bq_table_options preserved exactly as-is — its swallow-all-and-return-empty
contract is intentional and survives into the refactor; /schema continues to
return 200 with empty partition info when partition queries fail.
Outer wraps in scan_endpoint, scan_estimate_endpoint, sample, and schema
endpoints exist only to make the test pattern (monkeypatching whole
_fetch_* functions) work, and are tagged TODO(#134 Phase 2) for removal
once BqAccess centralizes translation.
* refactor(bq): #134 BqAccess facade — unify v2_scan, v2_sample, v2_schema, RemoteQueryEngine
Extracts the duplicated BigQuery-access pattern (project resolution +
client construction + DuckDB-extension session + Google-API error
translation) into connectors/bigquery/access.py. Migrates four
call sites to use it:
- app/api/v2_scan.py — _bq_dry_run_bytes, _run_bq_scan
- app/api/v2_sample.py — _fetch_bq_sample
- app/api/v2_schema.py — _fetch_bq_schema (strict translation),
_fetch_bq_table_options (preserves swallow-all best-effort contract)
- src/remote_query.py — RemoteQueryEngine, lazy bq_access kwarg
The new module exposes:
- BqProjects (frozen dataclass: billing + data project IDs)
- BqAccessError (typed exception with HTTP_STATUS class mapping)
- BqAccess (facade with injectable client_factory/duckdb_session_factory
for tests; defaults call the real google-cloud-bigquery + DuckDB extension)
- get_bq_access (module-level @functools.cache; FastAPI Depends target)
- translate_bq_error (Google API exception → BqAccessError mapper, with
BqAccessError pass-through, 'serviceusage'-substring heuristic for
cross_project_forbidden, and bad_request_status param distinguishing
user-derived (400) from server-constructed (502) SQL)
- _default_client_factory, _default_duckdb_session_factory
RemoteQueryEngine.__init__ no longer accepts _bq_client_factory; tests
migrate to bq_access=BqAccess(projects, client_factory=...). DuckDB-only
RemoteQueryEngine tests need no changes — bq_access defaults to None and
get_bq_access() is only invoked on first BQ call (lazy resolution).
BqAccessError raised internally is translated to RemoteQueryError(
error_type="bq_error") in _get_bq_client to preserve the engine's
existing public contract — CLI and /api/query/hybrid callers see no change.
Endpoint tests (test_v2_scan, test_v2_scan_estimate, test_v2_sample,
test_v2_schema) migrate from monkey-patching whole _fetch_* functions
to using the new bq_access fixture in tests/conftest.py — which
exercises the REAL translation path through BqAccess + translate_bq_error,
closing the test gap flagged in Task 1.1's review.
Side-effect behavior change: v2_sample's FROM clause now uses the data
project (instance.yaml data_source.bigquery.project), not the conflated
billing_project from Phase 1. Documented in CHANGELOG ### Internal.
BREAKING for deployments combining BIGQUERY_PROJECT env var with
data_source.bigquery.project in instance.yaml — env var now overrides
data project too. See CHANGELOG ### Changed.
Two known-duplicate BQ-access sites (connectors/bigquery/extractor.py,
scripts/duckdb_manager.register_bq_table) explicitly out of scope;
tracked as follow-up.
Removed stale docstring at the previous src/remote_query.py:204
that referenced scripts.duckdb_manager._create_bq_client as the default
BQ client factory (RemoteQueryEngine never actually used that function).
Test counts: tests/test_bq_access.py +27 (new), tests/test_v2_*.py +
tests/test_remote_query.py migrated to bq_access fixture (counts unchanged
or +1-2 per file). Full suite: 2086 passed, 8 pre-existing failures
(DB migration tests with unrelated internal_roles DependencyException —
not introduced by this PR).
* fix(bq_access): translate DefaultCredentialsError to BqAccessError(auth_failed)
CI on PR #138 caught: bigquery.Client(...) resolves Application Default
Credentials at construction time; without ADC (CI without SA key, dev
laptop without 'gcloud auth application-default login') it raises
google.auth.exceptions.DefaultCredentialsError synchronously.
Pre-fix _default_client_factory only caught ImportError, so DefaultCredentialsError
propagated as raw exception — and from production endpoints would surface
as bare 500 (the exact failure mode #134 sets out to fix).
Now translates to BqAccessError(kind='auth_failed', details.hint='Run
gcloud auth application-default login...'). Endpoint catch chain returns
HTTP 502 with structured body. Adds unit test
test_raises_auth_failed_on_default_credentials_error.
Third-round spec review flagged this case in passing; the fix didn't land.
CI's auth-less environment surfaced it.
* fix(bq_access): get_bq_access() returns sentinel instead of raising when not configured
Devin BUG_0001 on PR #138 review: 'get_bq_access() as FastAPI Depends
breaks all v2 endpoints for non-BigQuery instances'.
Pre-fix: get_bq_access() raised BqAccessError(not_configured) when
neither BIGQUERY_PROJECT env nor data_source.bigquery.project was set.
Because FastAPI resolves Depends() BEFORE the endpoint body runs, this
exception fires during dep-injection — the endpoint's try/except
BqAccessError clause never gets a chance to catch it. Result: every
v2 request on Keboola-only or CSV-only instances returned bare HTTP
500, even for local-source tables that never touch BigQuery.
Fix: get_bq_access() now returns a sentinel BqAccess with empty
BqProjects and factories that raise BqAccessError(not_configured)
on actual use. Construction succeeds, FastAPI's dep-injection cleanly
yields the sentinel, the endpoint runs. The local-source code path
in build_sample / build_schema / etc. never calls bq.client() or
bq.duckdb_session() (it reads parquet directly), so non-BQ tables
return 200 as before. Only when an endpoint actually tries to query
BQ (source_type == 'bigquery') does the sentinel raise — and the
endpoint's existing except BqAccessError catches it normally,
returning structured 502 with hint.
Test get_bq_access::test_raises_not_configured_when_neither_set
renamed and rewritten to test_returns_sentinel_when_neither_set:
asserts BqAccess is returned, then asserts client() and
duckdb_session() each raise BqAccessError(not_configured) on call.
Test test_does_not_cache_exceptions removed (no longer applicable)
and replaced with test_sentinel_is_cached_per_process documenting
the operator-restart-on-config-change contract.
* docs(spec+plan): #134 genericize customer-specific tokens (CLAUDE.md OSS rule)
Devin BUG_0001/0002 round 3 on PR #138: spec and plan docs contained
customer-specific deployment hostnames, deployment names, and a GCP
project ID that violated CLAUDE.md's vendor-agnostic OSS rule
('Nothing customer-specific belongs in code, configuration defaults,
comments, docs, commit messages, PR titles, or PR bodies').
Replacements:
agnes-development.groupondev.com -> <your-agnes-host>
agnes-development -> <your-dev-instance>
prj-grp-dataview-prod-1ff9 -> <your-data-project>
s1_session_landings -> <bq_table_id>
E2E verification semantics unchanged — operators still run the same
four curls + config flip + retry, just substituting their own host /
deployment name / project / table.
* fix(bq_access): hook get_bq_access.cache_clear into instance_config.reset_cache
Devin ANALYSIS_0004 on PR #138: get_bq_access is @functools.cache'd at
process level, so it captures BigQuery project IDs at first call and
ignores subsequent instance.yaml changes. Pre-Phase-2 the v2 endpoints
re-read get_value() on every request, so admin /api/admin/server-config
saves (which call instance_config.reset_cache()) hot-reloaded the BQ
project. Without this fix, my refactor silently regresses that contract
— operators editing instance.yaml via the admin UI would see no effect
on v2 endpoints until container restart.
instance_config.reset_cache() now also calls
connectors.bigquery.access.get_bq_access.cache_clear() (lazy import,
swallowed if connectors module isn't loaded — keeps instance_config
usable in isolated unit tests).
Adds test_instance_config_reset_cache_invalidates_get_bq_access as
regression guard. Updates CHANGELOG Internal entry to mention the
hot-reload contract + the not-configured sentinel behavior (round-3
fix from Devin BUG_0001 was previously only in commit message).
* fix(bq_access): surface not_configured before identifier validation + plan path genericize
Devin BUG_0001 + BUG_0002 round 5 on PR #138.
BUG_0001 (plan doc): personal filesystem path violated CLAUDE.md
vendor-agnostic rule. Replaced with '<worktree-root>' placeholder.
BUG_0002 (sentinel error path): when get_bq_access() returns the sentinel
BqAccess (BQ not configured), the empty bq.projects.data was reaching
validate_quoted_identifier first and raising ValueError -> endpoint
mapped to HTTP 400 'unsafe_identifier' instead of structured 500
'not_configured' with hint.
Each fetch helper now checks 'if not bq.projects.data: bq.client()' as
the first step, which triggers the sentinel's BqAccessError(not_configured).
Endpoint catches the typed error and returns HTTP 500 with hint pointing
at data_source.bigquery.project. Best-effort _fetch_bq_table_options
returns {} silently in this case (preserves the swallow-all contract).
* fix(bq_access): classify DuckDB-native exceptions from bigquery_query() via string match
Devin ANALYSIS on PR #138 review (latest round). The DuckDB bigquery
extension is a C++ plugin making its own HTTP calls — when BQ returns
403, it throws duckdb.IOException with the BQ error embedded as text,
not gax.Forbidden. translate_bq_error's isinstance checks would miss
these, falling to case 7 → bare 500 in production for v2_scan, v2_sample,
and v2_schema (the bigquery_query() paths).
Fix: last-resort string-match heuristic before the re-raise. 'Forbidden'
/ '403' / 'Bad Request' / '400' in the lowercased message classifies via
the same kind hierarchy. The 'serviceusage' substring still distinguishes
cross_project_forbidden from bq_forbidden. Specific enough that random
exceptions without HTTP-error keywords still re-raise.
Adds 4 unit tests covering the new heuristic + the 'don't swallow random
exceptions' invariant.
* chore(release): cut 0.22.0
PR #138 contains issue #134 user-visible behavior changes:
- BREAKING: BIGQUERY_PROJECT env var now overrides instance.yaml
data_source.bigquery.project for v2 endpoints (previously
RemoteQueryEngine billing only).
- Fixed: structured 502/400 on /api/v2/sample, /scan, /scan/estimate,
/schema when BigQuery raises Forbidden/BadRequest (was bare 500).
- Internal: BqAccess facade refactor unifying four duplicate BQ-access
call sites; instance_config.reset_cache() now invalidates BqAccess
cache too so admin server-config saves hot-reload BQ project IDs.
Bumps to 0.22.0 because PR #137 merged first and took 0.21.0.
ZdenekSrotyr