WACS.WASI.Preview2.DependencyInjection 0.3.0

WACS.WASI.Preview2.DependencyInjection

Microsoft.Extensions.DependencyInjection extensions for WACS.WASI.Preview2. One-call registration of every WASI 0.2.3 subsystem default + a pre-wired Linker.

Component-mode WASI Preview 2 hosts assemble a lot of moving pieces — typed [WitSource] interfaces per subsystem, the resource-handle registry, the Linker that fires every *Bindings.BindToRuntime, the composite bundle that exposes Preview 2 + WASI.NN through one CLR object. This package wires it all in idiomatic .NET DI form.

Install

dotnet add package WACS.WASI.Preview2.DependencyInjection

Quick start — WasiPreview2RuntimeScope (one-shot embedder)

The simplest path: one disposable that owns the DI scope, fires every binding's BindToRuntime, and resolves the composite bundle.

using Wacs.Core.Runtime;
using Wacs.WASI.Preview2.DependencyInjection;

var runtime = new WasmRuntime();
using var wasi = new WasiPreview2RuntimeScope(
 runtime,
 preopens: new[] { ("./models", "/models") });

// wasi.Bundle → composite hostBundle
// (Preview2 + WASI.NN forwarding when the
// WASI.NN.DependencyInjection sibling is on
// the load path)
// wasi.Resources → single resource registry across subsystems
// wasi.Runtime → runtime, with every wasi:* binding wired

// ... transpile the component, instantiate, invoke ...

WasiPreview2RuntimeScope is what wacs run --wasip2 uses internally. It auto-discovers Wacs.WASI.NN.DependencyInjection when present and registers the WasiPreview2NNBundle composite — no extra config when chaining wasi-nn alongside.

Quick start — IServiceCollection

For ASP.NET, generic-host worker services, or anywhere with an existing DI container:

using Microsoft.Extensions.DependencyInjection;
using Wacs.WASI.Preview2.DependencyInjection;

var services = new ServiceCollection();
services.AddWasiPreview2(); // every WASI 0.2.3 subsystem default registered

// Override individual subsystems via DI's normal TryAdd semantics:
services.AddSingleton<IOutgoingHandler>(_ =>
 new HttpClientOutgoingHandler(new HttpClient { Timeout = ... }));
services.AddSingleton<IEnvironment>(_ =>
 new SandboxedEnvironment(envVars: ..., args: ..., cwd: ...));

using var sp = services.BuildServiceProvider();
using var scope = sp.CreateScope();

var linker = scope.ServiceProvider.GetRequiredService<Linker>();
// linker.Runtime is the WasmRuntime with every wasi:* import bound

AddWasiPreview2(opts => opts.InstanceLifetime = ServiceLifetime.Scoped) is the default — fits ASP.NET request-scoped wasm execution. Pass Transient for per-call construction or Singleton for single-component apps.

Composing with WASI.NN

When WACS.WASI.NN.DependencyInjection is on the load path, the runtime scope auto-discovers it and registers the WasiPreview2NNBundle composite that forwards both Preview 2 and WASI.NN [WitSource] interface properties through one CLR object. The transpiler's direct-link IL casts to the composite type at the import call site; this package's auto-detection guarantees the expected type is present without any extra config.

What's included

• Default impls for every WASI 0.2.3 subsystem: cli / clocks / filesystem / http / io / random / sockets
• WasiPreview2Bundle (single-package) and WasiPreview2NNBundle (composite) bundle types
• WasiPreview2Resources — the canonical resource registry direct-link emit looks up
• WasiPreview2RuntimeScope — one-shot scope owning DI lifecycle, Linker resolution, and composite-bundle discovery

Documentation

• docs/COMPONENT_CHAINING.md — runtime requirements, host-package composition, end-to-end CLI / embedder examples
• Sibling package WACS.WASI.Preview2's README for manual subsystem wiring (no DI), per-impl override patterns

License

Apache-2.0