Gate flows schema-init on user_version, not a single-table probe - #82
Gate flows schema-init on user_version, not a single-table probe#82mysma-9403 wants to merge 1 commit into
user_version, not a single-table probe#82Conversation
`ensure_schema_initialized` confirmed a cached "already initialized" path with a single-table `sqlite_master` presence probe for `flow_definitions`. That honours the cache whenever the table merely exists, so a `flows.db` replaced at runtime with an older/partial schema — the table present but missing a migrated column (`require_approval` / `graph_hash`) or one of the other tables — passed the probe, and the next query then failed with `no such column` / `no such table` until the process restarted. The probe only restored self-healing for a deleted (empty) database, not a drifted one. The gate also dropped the `INITIALIZED_SCHEMAS` guard before `init_schema`, so two first callers for the same path could both run the DDL. Replace the presence probe with a `PRAGMA user_version` gate and make the fast path lock-free: - `init_schema` stamps `FLOWS_DB_SCHEMA_VERSION` into `user_version` only after a full, successful migration. - `ensure_schema_initialized` reads `user_version` lock-free first and returns on a match, so the common already-initialized case — which runs once per node per live run via `upsert_flow_run_step`, not just at store open — never acquires the process mutex. - Only a version mismatch takes the `INITIALIZED_SCHEMAS` lock, re-reads `user_version` under it (double-check), then runs the idempotent `init_schema`, so init is atomic per path and a stale/partial on-disk schema (including a drifted column) is re-migrated instead of trusted. - `INITIALIZED_SCHEMAS` no longer gates the DDL; it is kept as a diagnostic marker so the "deleted/replaced at runtime" warning fires only for a path this process already initialized, not on every fresh-boot init (version 0). Add `flows::older_on_disk_schema_under_a_cached_path_is_remigrated`, which drops the `require_approval` migrated column and resets `user_version` under a cached path, then asserts the next op re-migrates rather than failing `no such column`. These two findings were raised (CodeRabbit/Codex) on the equivalent in-repo fix in the host before this store was extracted here; the lock-free variant was verified on tinyhumansai/openhuman#5708.
📝 WalkthroughWalkthroughSQLite schema initialization now uses ChangesSQLite schema initialization
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟠 High · up to During a binary downgrade, the database can contain a newer schema than this release supports, but the current initialization path may rewrite its version marker and continue instead of rejecting it. That can leave the store in an incompatible state, so merge should wait for explicit handling of newer schema versions. Sequence Diagram(s)sequenceDiagram
participant FlowAPI
participant SQLite
participant InitializationMutex
FlowAPI->>SQLite: Read PRAGMA user_version
alt Schema version matches
SQLite-->>FlowAPI: Return initialized database
else Schema version differs
FlowAPI->>InitializationMutex: Recheck initialization state
InitializationMutex->>SQLite: Run init_schema migrations
SQLite-->>InitializationMutex: Stamp FLOWS_DB_SCHEMA_VERSION
InitializationMutex-->>FlowAPI: Return migrated database
end
Suggested reviewers: Poem
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How this change flows1 changed behaviour across 16 relationships. 6 surrounding behaviours are shown (60 graph nodes walked). 35 further behaviours left out to keep the diagram readable. flowchart LR
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Green: changed behaviour. Grey: surrounding behaviour. Arrows name the call, use, implementation, or test relationship. Orange: has findings. Red: has a finding that blocks the merge. |
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Inline comments:
In `@crates/tinyflows-sqlite/src/flows/mod.rs`:
- Line 124: Update the schema-version handling around init_schema so a database
with user_version greater than FLOWS_DB_SCHEMA_VERSION returns an error and is
not reinitialized or overwritten. Preserve migration or initialization only for
lower or matching schema versions, using the existing schema-version symbols and
error-handling conventions.
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| init_schema(conn)?; | ||
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| // Mismatch ⇒ (re-)initialization is required. Serialize it so two first |
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🗄️ Data Integrity & Integration | 🟠 Major | ⚡ Quick win
Reject databases with a newer schema version.
Line 124 treats user_version > FLOWS_DB_SCHEMA_VERSION as an old schema. During a binary downgrade, init_schema then overwrites the newer version stamp with 1 at Line 251. Return an error for higher versions. Only migrate lower versions.
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In `@crates/tinyflows-sqlite/src/flows/mod.rs` at line 124, Update the
schema-version handling around init_schema so a database with user_version
greater than FLOWS_DB_SCHEMA_VERSION returns an error and is not reinitialized
or overwritten. Preserve migration or initialization only for lower or matching
schema versions, using the existing schema-version symbols and error-handling
conventions.
1 participant
Summary
The flows-store schema-init gate (
R-m8) confirms a cached "already initialized" path with a single-tablesqlite_masterpresence probe. That honours the cache wheneverflow_definitionsmerely exists, so aflows.dbreplaced at runtime with an older/partial schema — the table present but missing a migrated column (require_approval/graph_hash), or missing one of the other tables — passes the probe, and the next query then fails withno such column/no such tableuntil the process restarts. The old migrate-on-every-open behaviour upgraded such a restored database immediately; the presence probe only restored self-healing for a deleted (empty) database, not a drifted one. Separately, the gate drops theINITIALIZED_SCHEMASguard beforeinit_schema, so two first callers for the same path can both observe a miss and both run the DDL.This replaces the presence probe with a
PRAGMA user_versiongate and makes the fast path lock-free:init_schemastampsFLOWS_DB_SCHEMA_VERSIONintouser_versiononly after a full, successful migration.ensure_schema_initializedreadsuser_versionlock-free first and returns on a match — the common already-initialized case (which here runs once per node per live run viaupsert_flow_run_step, not just at store open) never acquires the process mutex.INITIALIZED_SCHEMASlock, re-readsuser_versionunder it (double-check), then runs the idempotentinit_schema— so initialization is atomic per path, and a stale/partial on-disk schema (including a drifted column, which a single-table probe cannot detect) is re-migrated instead of trusted.INITIALIZED_SCHEMASno longer gates the DDL; it is kept purely as a diagnostic marker so the "deleted/replaced at runtime" warning fires only for a path this process already initialized, not on every fresh-boot init (whereuser_versionis legitimately 0).Context. OpenHuman binds this store (
src/openhuman/flows/store.rs). These same two findings were raised (CodeRabbit/Codex, bothMajor) on the equivalent in-repo fix there before the store was extracted into this crate; maintainer @M3gA-Mind noted on tinyhumansai/openhuman#5715 that the concern "belongs upstream intinyflows_sqliteand would be welcome there." The lock-free variant chosen here (rather than a per-path lock registry) was reviewed and verified by CodeRabbit on tinyhumansai/openhuman#5708 ("the original hot-path serialization finding is addressed; a path-specific lock registry is not required").API Or Behavior Changes
No public API change. Behavior change is a correctness fix: a
flows.dbreplaced at runtime with an older/partial schema is now re-migrated on the next open instead of being trusted and failing later withno such column/no such table; concurrent first-openers of the same path run the DDL exactly once.Tests
New regression test
flows::older_on_disk_schema_under_a_cached_path_is_remigrated— drops the migratedrequire_approvalcolumn and resetsuser_versionunder an already-cached path (exactly how a pre-migration database looks on disk), then asserts the nextlist_flows/create_flowre-migrates rather than failingno such column. The existingschema_reinitializes_when_the_database_file_is_deleted_at_runtime,schema_initializes_independently_for_each_distinct_database_path, and the fresh-init idempotence test still pass (48 passed, 0 failed).cargo fmt --checkcargo clippy --all-targets -- -D warningscargo clippy --all-targets --all-features -- -D warningscargo build --all-targetscargo build --all-targets --all-featurescargo testcargo test --all-featuresDocumentation
Updated the doc comments on
INITIALIZED_SCHEMAS,ensure_schema_initialized, andinit_schemato describe theuser_versionauthority, the lock-free fast path, and the marker's new diagnostic-only role. NoCHANGELOG.mdentry:tinyflows-sqliteis still under[Unreleased], so this hardening is subsumed by the crate's existing "Added" entry — happy to add a### Fixedline if you'd prefer it called out.Summary by CodeRabbit
Bug Fixes
Tests