http-wasm Guest Library for TinyGo

http-wasm is HTTP client middleware implemented in WebAssembly. This is a TinyGo WASI library that implements the Guest ABI.

Example

The following is an example of routing middleware:

package main

import (
	"strings"

	"github.com/http-wasm/http-wasm-guest-tinygo/handler"
	"github.com/http-wasm/http-wasm-guest-tinygo/handler/api"
)

func main() {
	handler.HandleRequestFn = handleRequest
}

// handle implements a simple HTTP router.
func handleRequest(req api.Request, resp api.Response) (next bool, reqCtx uint32) {
	// If the URI starts with /host, trim it and dispatch to the next handler.
	if uri := req.GetURI(); strings.HasPrefix(uri, "/host") {
		req.SetURI(uri[5:])
		next = true // proceed to the next handler on the host.
		return
	}

	// Serve a static response
	resp.Headers().Set("Content-Type", "text/plain")
	resp.Body().WriteString("hello")
	return // skip any handlers as the response is written.
}

If you make changes, you can rebuild this with TinyGo v0.28 or higher like so:

tinygo build -o examples/router/main.wasm -scheduler=none --no-debug -target=wasi examples/router/main.go

There are also more examples you may wish to try out!

WARNING: This is an early draft

The current maturity phase is early draft. Once this is integrated with coraza and dapr, we can begin discussions about compatability.