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@github-actions github-actions released this 08 Jan 10:13
· 95 commits to main since this release
v0.8.1
3395d4b

This release makes running user-provided WASM binaries a whole bunch safter by providing restrictions on memory and CPU usage.

Have a look at Wasmex.StoreLimits for memory restrictions and Wasmer.EngineConfig on how to limit fuel (CPU usage quota).

The new Wasmex.EngineConfig allows better reporting when WASM execution fails -- setting wasm_backtrace_details enables error backtraces to include file and line number information if that debug info is available in the running WASM file.

A Wasmex.EngineConfig is used to create a Wasmex.Engine, which holds configuration for a Wasmex.Store. It allows us to selectively enable/disable more WASM option (e.g. enabling certain WASM proposals).
Today, a Wasmex.Engine already gives us a faster way to precompile modules without the need to instantiate them through Wasmex.Engine.precompile_module/2.

Added

  • Added precompiled binary for aarch64-unknown-linux-musl
  • Added support for setting store limits. This allows users to limit memory usage, instance creation, table sizes and more. See Wasmex.StoreLimits for details.
  • Added support for metering/fuel_consumption. This allows users to limit CPU usage. A Wasmex.Store can be given fuel, where each WASM instruction of a running WASM binary uses a certain amount of fuel. If no fuel remains, execution stops. See Wasmex.EngineConfig for details.
  • Added Wasmex.EngineConfig as a place for more complex WASM settings. With this release an engine can be configured to provide more detailed backtraces on errors during WASM execution by setting the wasm_backtrace_details flag.
  • Added Wasmex.Engine.precompile_module/2 which allows module precompilation from a .wat or .wasm binary without the need to instantiate said module. A precompiled module can be hydrated with Module.unsafe_deserialize/2.
  • Added Wasmex.module/1 and Wasmex.store/1 to access the module and store of a running Wasmex GenServer process.
  • Added option to Wasmex.EngineConfig to configure the cranelift_opt_level (:none, :speed, :speed_and_size) allowing users to trade compilation time against execution speed

Changed

  • mix.exs now also requires at least Elixir 1.12
  • Module.unsafe_deserialize/2 now accepts a Wasmex.Engine in addition to the serialized module binary. It's best to hydrate a module using the same engine config used to serialize or precompile it. It has no harsh consequences today, but will be important when we add more WASM features (e.g. SIMD support) in the future.
  • added typespecs for all public Wasmex methods
  • improved documentation and typespecs
  • allow starting the Wasmex GenServer with a %{bytes: bytes, store: store} map as a convenience to spare users the task of manually compiling a Wasmex.Module
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