Crate uni_plugin_wasm_rt 

Shared runtime helpers for the uni-db WASM plugin loaders.

uni-plugin-wasm-rt is the M6.shared lift — a crate that sits below both uni-plugin-extism and uni-plugin-wasm in the dependency graph and owns the two pieces of machinery they would otherwise duplicate:

• Arrow IPC bridge (ipc) — RecordBatch ↔ stream bytes, shared between Extism’s bytes-in/bytes-out boundary and the Component Model’s linear-memory boundary.
• Per-plugin instance cache (pool) — generic over the per-invoke instance type and the loader’s error type. Both loaders alias this with their concrete T and error. It builds a fresh instance per acquire (so guest state can’t leak across calls) and enforces a concurrency cap.

Neither piece depends on extism or wasmtime; both depend only on arrow-ipc and parking_lot. That keeps the crate small and lets it stay below uni-plugin in the workspace dep graph, so the trait-only embedder pays nothing for plumbing they never invoke.

Modules

error

Shared error type for the wasm-rt IPC bridge.

ipc

Arrow IPC bridge — RecordBatch ↔ wire-stream bytes.

pool

Per-plugin instance cache with a concurrency cap.

Structs

InstancePool

A per-plugin instance cache with a concurrency cap.

PoolConfig

Per-pool configuration.

PoolMetrics

Pool metrics surface — read by host.metric_counter host imports.

PooledInstance

RAII handle to an instance acquired from an InstancePool.

Enums

IpcError

Errors raised by the Arrow IPC bridge.

Functions

decode_batch

Decode the single RecordBatch from Arrow IPC stream bytes.

decode_batches

Decode every RecordBatch from Arrow IPC stream bytes.

encode_batch

Encode a RecordBatch as Arrow IPC stream bytes.

encode_batches

Encode multiple RecordBatches sharing a schema as one IPC stream.