fix(node): bound GraphQL query cost - #408
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Limit details: You’ve used the included review currently available. 📝 WalkthroughWalkthroughThe GraphQL schema now applies complexity and depth limits. Repository and task fields have explicit complexity costs. Tests verify rejection of excessive queries before resolver execution, boundary-depth behavior, and preserved introspection. ChangesGraphQL query limits
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This change adds GraphQL complexity and depth limits with boundary and rejection coverage. No current merge-blocking risk is identified. Sequence Diagram(s)sequenceDiagram
participant GraphQLClient
participant SchemaBuilder
participant GraphQLResolver
GraphQLClient->>SchemaBuilder: Submit query
SchemaBuilder->>SchemaBuilder: Validate complexity and depth
SchemaBuilder-->>GraphQLClient: Return validation error
SchemaBuilder->>GraphQLResolver: Execute valid query
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@crates/gitlawb-node/src/graphql/mod.rs`:
- Around line 265-267: Update the test using the GRAPHQL_MAX_DEPTH-generated
selection to explicitly accept a depth-12 query and reject a depth-13 query,
while preserving the zero-resolver assertion for the rejected case.
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crates/gitlawb-node/src/graphql/mod.rscrates/gitlawb-node/src/graphql/query.rs
Limit details: You’ve used the included review currently available.
Greptile SummaryAdds schema-wide GraphQL complexity and depth validation to reject expensive documents before resolver execution.
Confidence Score: 5/5The PR appears safe to merge with no concrete blocking or independently actionable issue identified. All production schema construction paths receive the validation limits, every current DB-backed query root receives the intended base cost, and checked repository requests remain within the configured bounds.
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| Filename | Overview |
|---|---|
| crates/gitlawb-node/src/graphql/mod.rs | Applies schema-wide complexity and depth limits and tests that rejected documents do not reach resolvers. |
| crates/gitlawb-node/src/graphql/query.rs | Adds a fixed complexity charge to every current DB-backed QueryRoot field. |
Flowchart
%%{init: {'theme': 'neutral'}}%%
flowchart LR
A[GraphQL document] --> B{Validation}
B -->|Complexity > 400| C[Reject before resolvers]
B -->|Depth > 12| C
B -->|Within limits| D[Execute root resolvers]
D --> E[(Database)]
Reviews (1): Last reviewed commit: "fix(node): Bound GraphQL query cost." | Re-trigger Greptile
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The core mechanism is sound: limit_complexity(400) and limit_depth(12) are installed on the schema builder, and async-graphql 7.2.1 rejects documents exceeding either before any resolver runs. I verified both guards are load-bearing by replacing the limits with 1000000 in a mutation worktree: expensive_root_aliases_are_rejected_before_database_access and query_depth_limit_accepts_twelve_and_rejects_thirteen both went red. The PR's test-plan command (cargo test -p gitlawb-node graphql::tests::) passes with 9 tests green, matching the claim.
The complexity model has two gaps that leave the PR's stated goal, "bound GraphQL query cost," partially unmet, and the test suite doesn't prove the production builder is wired. Details below.
Findings
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[P2] Add complexity costs to DB-backed mutation roots
crates/gitlawb-node/src/graphql/mutation.rs
The PR annotates four query roots with#[graphql(complexity = "50 + child_complexity")]but leavesMutationRootfields at the default cost of 1. I verified with a probe that 200 aliases of a mutation field all execute: resolver count was 200, no complexity rejection, complexity score 200 (under 400). Each mutation does real DB work (inserts, updates, broadcast sends). Mutations run serially per the GraphQL spec (async-graphql callsresolve_containerwithserial=truefor mutations), so this is not a parallel fan-out, but a single authenticated request still amplifies into 200 sequential DB writes. DIDs are permissionless, so therequire_signergate does not prevent amplification. Adding the same50 + child_complexityannotation tocreate_task,claim_task,complete_task, andfail_taskwould cap mutation aliases at 8 per request, matching the query-root budget. -
[P2] Scale list-root complexity by the limit argument
crates/gitlawb-node/src/graphql/query.rs:51
ref_updatesandtasksaccept alimit: i64argument (clamped to 200 intasks) but the complexity formula is flat:50 + child_complexity. A queryrefUpdates(limit: 200) { repo }scores 51, the same aslimit: 1, despite returning up to 200 rows. Seven aliases ofrefUpdates(limit: 200) { repo }score 357 (under 400) but return up to 1400 rows. async-graphql's complexity expression can reference field arguments directly, as shown in the library's own test suite (count * child_complexity + 2). A formula like50 + limit * child_complexitywould charge proportionally to requested row count. -
[P2] Exercise
build_schemain at least one limit test
crates/gitlawb-node/src/graphql/mod.rs:181
All three PR tests callapply_query_limits(Schema::build(...))directly, notbuild_schema(...). I verified that removingapply_query_limitsfrombuild_schema(line 99) leaves all three tests green. The tests proveapply_query_limitsworks but don't prove the production builder calls it. A test that constructs a schema throughbuild_schemawith a minimalDbfixture, or that asserts the production schema'sSchemaInnercarries the configured limits, would close this gap. -
[P3] Add an accepted-boundary test at seven aliases
crates/gitlawb-node/src/graphql/mod.rs:181
The PR tests that eight aliases ofrepos { name }are rejected (408 > 400) but doesn't test that seven are accepted (357 < 400). I verified both directions with a probe using a cost-50 root: seven aliases passed and ran 7 resolvers, eight were rejected with "Query is too complex." and 0 resolvers. An accepted-boundary test confirms the limit isn't too aggressive and that legitimate aliased queries still work.
The depth limit test uses a synthetic recursive Nested type. The current public schema is flat (no recursive types), so depth greater than 12 isn't reachable today. The test proves the depth guard works but doesn't prove production schema behavior. Not an ask because the synthetic test is sufficient for the current schema shape and the depth limit is forward-looking protection.
Subscriptions (ref_updates, task_events) have default complexity (1 + child_complexity). A subscription document with many aliases is complexity-scored, but the score applies only to the initial document, not the event stream. The ref_updates subscription is unauthenticated by design (documented in subscription.rs). This is a residual architectural concern outside the PR's query-root scope, not a gap introduced by this PR.
The introspection test uses a simplified query. I have not verified whether a full GraphiQL or Apollo client introspection query would exceed complexity 400. If the project ships a GraphiQL playground, this could block legitimate introspection. Not an ask without evidence of the actual client query in use.
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Summary
Anonymous GraphQL documents can repeat DB-backed root fields through aliases, multiplying unpaginated database reads without a request-level work budget. This change rejects overly complex or deeply nested documents during validation, before resolvers start.
No directly matching issue or pull request was found after searching the current tracker for GraphQL alias, complexity, depth, and query-cost controls.
Changes
Test plan
cargo test -p gitlawb-node graphql::tests::cargo fmt --all -- --checkcargo clippy -p gitlawb-node --bin gitlawb-node -- -D warningscargo clippy -p gitlawb-node --all-targets -- -A dead-code -D warningsSummary by CodeRabbit