507ce79080
This adds two clock interfaces: sys.Walltime and sys.Nanotime to allow implementations to override readings for purposes of security or determinism. The default values of both are a fake timestamp, to avoid the sandbox break we formerly had by returning the real time. This is similar to how we don't inherit OS Env values.
83 lines
2.3 KiB
Go
83 lines
2.3 KiB
Go
package main
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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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"os"
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"strconv"
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"github.com/tetratelabs/wazero"
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"github.com/tetratelabs/wazero/assemblyscript"
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)
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// asWasm compiled using `npm install && npm run build`
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//go:embed testdata/assemblyscript.wasm
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var asWasm []byte
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// main shows how to interact with a WebAssembly function that was compiled
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// from AssemblyScript
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//
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// See README.md for a full description.
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func main() {
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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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// Use WebAssembly 2.0 because AssemblyScript uses some >1.0 features.
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r := wazero.NewRuntimeWithConfig(wazero.NewRuntimeConfig().
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WithWasmCore2())
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defer r.Close(ctx) // This closes everything this Runtime created.
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// Instantiate a module implementing functions used by AssemblyScript.
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// Thrown errors will be logged to os.Stderr
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_, err := assemblyscript.Instantiate(ctx, r)
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if err != nil {
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log.Panicln(err)
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}
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// Compile the WebAssembly module using the default configuration.
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code, err := r.CompileModule(ctx, asWasm, wazero.NewCompileConfig())
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if err != nil {
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log.Panicln(err)
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}
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// Instantiate a WebAssembly module that imports the "abort" and "trace"
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// functions defined by assemblyscript.Instantiate and exports functions
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// we'll use in this example.
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mod, err := r.InstantiateModule(ctx, code, wazero.NewModuleConfig().
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// Override the default module config that discards stdout and stderr.
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WithStdout(os.Stdout).WithStderr(os.Stderr))
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if err != nil {
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log.Panicln(err)
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}
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// Get references to WebAssembly functions we'll use in this example.
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helloWorld := mod.ExportedFunction("hello_world")
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goodbyeWorld := mod.ExportedFunction("goodbye_world")
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// Let's use the argument to this main function in Wasm.
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numStr := os.Args[1]
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num, err := strconv.Atoi(numStr)
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if err != nil {
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log.Panicln(err)
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}
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// Call hello_world, which returns the input value incremented by 3.
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// While this calls trace(), our configuration didn't enable it.
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results, err := helloWorld.Call(ctx, uint64(num))
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if err != nil {
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log.Panicln(err)
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}
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fmt.Printf("hello_world returned: %v", results[0])
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// Call goodbye_world, which aborts with an error.
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// assemblyscript.Instantiate was configured above to abort to stderr.
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results, err = goodbyeWorld.Call(ctx)
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if err == nil {
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log.Panicln("goodbye_world did not fail")
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}
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}
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