Module wasmtime_wasi::preview2

Wasmtime’s WASI Preview 2 Implementation

Welcome to the (new!) WASI implementation from the Wasmtime team. The goal of this implementation is to support WASI Preview 2 via the Component Model, as well as to provide legacy Preview 1 host support with an adapter that is implemented in terms of the Preview 2 interfaces.

Presently, this crate is experimental. We don’t yet recommend you use it in production. Specifically:

• the wit files in tree describing preview 2 are not faithful to the standards repos

Once these issues are resolved, we expect to move this namespace up to the root of the wasmtime-wasi crate, and move its other exports underneath a pub mod legacy with an off-by-default feature flag, and after 2 releases, retire and remove that code from our tree.

Modules

• bindings
• command
• pipe
  Virtual pipes.
• preview1

Structs

• Deterministic
  Implement insecure-random using a deterministic cycle of bytes.
• DirPerms
• FilePerms
• I32Exit
  An error returned from the proc_exit host syscall.
• OccupiedEntry
  Like std::collections::hash_map::OccupiedEntry, with a subset of methods available in order to uphold Table invariants.
• Table
  The Table type is designed to map u32 handles to resources. The table is now part of the public interface to a WasiCtx - it is reference counted so that it can be shared beyond a WasiCtx with other WASI proposals (e.g. wasi-crypto and wasi-nn) to manage their resources. Elements in the Table are Any typed.
• WasiCtx
• WasiCtxBuilder

Enums

• HostPollable
  A host representation of the wasi:poll/poll.pollable resource.
• StreamState
• SystemTimeSpec
  A value for specifying a time.
• TableError

Traits

• HostInputStream
  Host trait for implementing the wasi:io/streams.input-stream resource: A bytestream which can be read from.
• HostMonotonicClock
• HostOutputStream
  Host trait for implementing the wasi:io/streams.output-stream resource: A bytestream which can be written to.
• HostWallClock
• RngCore
  The core of a random number generator.
• TablePollableExt
• TableStreamExt
  Extension trait for managing HostInputStreams and HostOutputStreams in the Table.
• WasiView

Functions

• thread_rng

Type Aliases

• ClosureFuture
• MakeFuture
• PollableFuture