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.
• preview0
• preview1

Structs

• AbortOnDropJoinHandle
• Deterministic
  Implement insecure-random using a deterministic cycle of bytes.
• DirPerms
• FilePerms
• I32Exit
  An error returned from the proc_exit host syscall.
• Network
• Pollable
  A host representation of the wasi:io/poll.pollable resource.
• ResourceTable
  The ResourceTable type maps a Resource<T> to its T.
• Stderr
  This implementation will yield output streams that block on writes, as they inherit the implementation directly from the rust std library. A different implementation of StdoutStream will be necessary if truly async output streams are required.
• Stdin
  Only public interface is the HostInputStream impl.
• Stdout
  This implementation will yield output streams that block on writes, as they inherit the implementation directly from the rust std library. A different implementation of StdoutStream will be necessary if truly async output streams are required.
• TrappableError
  A helper error type used by many other modules through type aliases.
• WasiCtx
• WasiCtxBuilder

Enums

• InputStream
• IsATTY
• ResourceTableError
  Errors returned by operations on ResourceTable
• StreamError
• SystemTimeSpec
  A value for specifying a time.

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.
• StdinStream
  A trait used to represent the standard input to a guest program.
• StdoutStream
  Similar to StdinStream, except for output.
• Subscribe
• WasiView

Functions

• in_tokio
• poll_noop
  Attempts to get the result of a future.
• spawn
• spawn_blocking
• stderr
• stdin
• stdout
• subscribe
  Creates a pollable resource which is susbcribed to the provided resource.
• thread_rng
• with_ambient_tokio_runtime
  Executes the closure f with an “ambient Tokio runtime” which basically means that if code in f tries to get a runtime Handle it’ll succeed.

Type Aliases

• ClosureFuture
• FsError
• FsResult
• MakeFuture
• OutputStream
• PollableFuture
• SocketError
• SocketResult
• StreamResult