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fix(pool): answer constant capability getters without a checkout - #990
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Adapter\Pool delegated every getter, so each getSupportFor*/getMax*/getHostname call checked out a connection and replayed the handle state onto it. Memoize the answers that are the same for every connection in a pool, keep delegating the getters that read connection or handle state, and update getSupportForAttributes from its setter.
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Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughPool caches adapter capability getter results per pool. It tracks attribute-support settings per handle and applies them during connection and transaction checkout. Timeout tests use ChangesPool capability caching
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to The change reduces connection checkouts for constant capability getters while keeping handle-dependent behavior delegated. No concrete merge-blocking risk was identified. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to A cached setting can keep required-field and unknown-field checks disabled after the underlying setting has been restored. Write permissions still apply, and exposure depends on connection sharing, application configuration, and request lifetime. Retained concerns
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Inline comments:
Review comments at @src/Database/Adapter/Pool.php:
- Line 904: Update Pool’s setSupportForAttributes path so the requested setting
is applied to every pooled adapter, not only the adapter returned by delegate();
keep getSupportForAttributes consistent with the setting used by any checked-out
connection.
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A handle is usually built for one request around a pool that lives as long as the process, so memoizing on the handle still checked a connection out for every distinct getter on every request. The answers now live in a WeakMap keyed by the pool, so each one is asked once per pool. Attribute support has a setter and stays per handle.
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Inline comments:
Review comments at @src/Database/Adapter/Pool.php:
- Around line 114-116: Update both adapter checkout paths in Pool so handles
with no supportForAttributes override restore the adapter’s default instead of
retaining a reused adapter’s previous value. Preserve the explicit override
behavior and ensure Memory and Mongo adapters do not carry stale
attribute-support state between handles.
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Its answer depends only on the value asked for, and every checkout already replays that value, so it is kept per pool like the capabilities. A pinned connection is told directly, since it is not replayed onto.
…on's own A connection keeps the attribute support its last holder set, so a handle that never set it ran with, and reported, whatever the previous handle left. Each connection's value from the first checkout is now replayed for those handles, on both checkout paths.
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Adapter\Poolsent every getter throughdelegate(). So eachgetSupportFor*,getMax*,getLimitFor*,getHostname,getIdAttributeType, etc. checked out a connection and replayed the full handle state onto it, only to read a constant.getDocumentasks for several of these per call.The Pool now keeps the answers to getters that are the same for every connection in a pool (same factory, so same adapter class and DSN). They are kept per pool, in a
WeakMapkeyed by theUtopia\Pools\Pool, not per handle: Appwrite builds a newAdapter\Poolfor everyDatabaseon every request, so a per-handle memo would still check out once per distinct getter per request.These still delegate because they read connection or handle state:
getDriver,getConnectionId,getMaxIndexLength(depends on shared tables),getSupportForPCRERegexandgetSupportForAttributeResizing(SQLite per-instance flags).getSupportForAttributeshas a setter, so the getter is per handle. The setter's answer depends only on the value asked for, so it is kept per pool too, and the requested value is replayed on every checkout (a pinned transaction connection is told directly).getHostnamedoes not keep an empty answer, andgetMinDateTimereturns a clone.PoolTimeoutTestnow usesping()to force a checkout, because a capability getter no longer does.Verification: a SQLite-backed Pool whose
use()counts checkouts, with a new handle per operation (Appwrite's shape) and a warmed-up handle.getDocumentgetDocumentgetDocumentfindcreateDocumentgetDocumentThe one remaining checkout on a new handle is
getSupportForAttributes, for handles that never set it. Appwrite's tenant databases set it on every handle, so once the pool has answered the setter they need no checkout to build the handle or to serve a cached read. Adapters with hostname support (MariaDB, Postgres) save two more checkouts pergetDocument.Refs appwrite/appwrite#14083
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