corebreaker / arbordb / 5
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5

Pull #1

circleci

corebreaker 
Let a write transaction read its own uncommitted state

A WriteTxn now exposes the same value and filesystem reads as a ReadTxn — load, fetch, get, get_as, load_value, load_serde_value, kind, exists, ls, find, query, plus times / get_acl / owner / groups and JSON/YAML export — but over its own uncommitted changes, so a read-modify-write stays atomic within one transaction instead of forcing a separate read transaction that could desynchronize against a concurrent commit.

The read surface is factored into a shared internal Grab trait (txn/grab.rs): a small set of transaction-specific primitives (resolve, entry_blob, index lookup/scan, and the permission and timestamp accessors) with every read method written once as a free function over &dyn Grab. ReadTxn implements the primitives over its cache-amortized snapshot; WriteTxn implements them over its own tables, never the caches, verifying integrity with the user's MAC and recording accesses into the same transaction.

IndexQuery now holds a &dyn Grab, so a query runs against a read snapshot or a writer's uncommitted state alike. RootedRead and RootedWrite gain the matching read surface (RootedWrite was previously write-only), including times / get_acl / owner / groups on both views.

Add integration tests: tests/write_reads.rs covers reading uncommitted state, atomic read-modify-write, rollback isolation, export, and index queries through a writer; the permissions and timestamps suites cover the new rooted-view accessors.
Pull Request #1: Initial developments

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Source Files on build 5