59 lines
1.5 KiB
Go
59 lines
1.5 KiB
Go
package wazero_test
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import (
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"context"
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_ "embed"
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"fmt"
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"log"
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"github.com/tetratelabs/wazero"
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"github.com/tetratelabs/wazero/imports/wasi_snapshot_preview1"
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)
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// addWasm was generated by the following:
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//
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// cd examples/basic/testdata; tinygo build -o add.wasm -target=wasi add.go
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//
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//go:embed examples/basic/testdata/add.wasm
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var addWasm []byte
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// This is an example of how to extend a Go application with an addition
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// function defined in WebAssembly.
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//
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// Since addWasm was compiled with TinyGo's `wasi` target, we need to configure
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// WASI host imports.
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//
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// A complete project that does the same as this is available here:
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// https://github.com/tetratelabs/wazero/tree/main/examples/basic
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func Example() {
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// Choose the context to use for function calls.
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ctx := context.Background()
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// Create a new WebAssembly Runtime.
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r := wazero.NewRuntime(ctx)
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defer r.Close(ctx) // This closes everything this Runtime created.
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// Instantiate WASI, which implements host functions needed for TinyGo to
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// implement `panic`.
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wasi_snapshot_preview1.MustInstantiate(ctx, r)
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// Instantiate the guest Wasm into the same runtime. It exports the `add`
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// function, implemented in WebAssembly.
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mod, err := r.InstantiateModuleFromBinary(ctx, addWasm)
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if err != nil {
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log.Panicln(err)
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}
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// Call the `add` function and print the results to the console.
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x, y := uint64(1), uint64(2)
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results, err := mod.ExportedFunction("add").Call(ctx, x, y)
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if err != nil {
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log.Panicln(err)
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}
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fmt.Printf("%d + %d = %d\n", x, y, results[0])
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// Output:
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// 1 + 2 = 3
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}
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