wasm-runner: add lazy stream/4 for resource-managed WASM streaming#18
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wasm-runner: add lazy stream/4 for resource-managed WASM streaming#18
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added 4 commits
February 28, 2026 22:02
…lpers Add ergonomic collection operations to WasmRunner that load a WASM module once and apply a function across multiple inputs: - run/4, run!/4: One-shot load+call+stop with WASI auto-detect and cache support, returning a single unwrapped value (vs Firebird.run/4 which returns a list) - map/4: Apply a WASM function over a list of argument lists using a single instance. Supports parallel execution via :concurrency option. - flat_map/5: Map + filter in a single pass over inputs - reduce/6: Fold WASM function results through an Elixir accumulator All functions accept file paths, raw bytes, or precompiled modules. By Sleepy
- Run mix format across all files (Elixir 1.16 formatting rules) - Fix unused generate_expr/3 in wat_gen.ex - Fix unused module_name variable in firebird.compile.ex - Register @wasm attribute with accumulate: true in wasm_modules - Suppress noisy FastNif load warning (expected in dev)
- Fix @wasm warning in physics.ex (missed in previous commit) - Compile deps separately to avoid --warnings-as-errors on rustler - Replace charlist literal with integer list for cross-version compat
Add WasmRunner.stream/4 which returns an Elixir Stream that: - Loads the WASM instance lazily on first element consumed - Calls the function one-at-a-time as elements are pulled - Automatically stops the instance when the stream ends or halts - Composes with all standard Stream/Enum functions Unlike map/4 which eagerly evaluates everything into memory, stream/4 enables lazy processing of large/unbounded input sets with proper resource cleanup via Stream.resource/3. Includes 16 tests covering: basic usage, early termination, Stream.filter/map/chunk_every/take_while/with_index/zip composition, Enum.take/find/reduce/count, cleanup guarantees, and equivalence with map/4 for full consumption.
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By Sleepy
What
Adds
WasmRunner.stream/4— a lazy stream that applies a WASM function over argument lists with automatic instance lifecycle management.Why
map/4eagerly evaluates all calls and collects results into a list. For large or unbounded input sets, this wastes memory.Firebird.Streamrequires manual instance management.stream/4fills this gap.How
Uses
Stream.resource/3to:Composes naturally with all Elixir
StreamandEnumfunctions.Tests
16 new tests covering:
Enum.take,Enum.find,Stream.take_while)filter,map,chunk_every,with_index,zip)Enum.reduce,Enum.count)map/4for full consumption