main.go

// MIT License
//
// Copyright 2019 Canonical Ledgers, LLC
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.

package main

import (
	"flag"
	"fmt"
	"io/ioutil"
	"log"

	"github.com/Factom-Asset-Tokens/factom-wasm/runtime"
)

func init() {
	log.SetFlags(log.Lshortfile)
}

func main() {
	var binPath string
	var fName string

	flag.StringVar(&binPath, "wasm", "./code.wasm", "wasm module binary")
	flag.StringVar(&fName, "call", "run", "function to call")
	flag.Parse()

	// Load WASM...
	bin, err := ioutil.ReadFile(binPath)
	if err != nil {
		log.Fatal(err)
	}

	vm, err := runtime.NewVM(bin)
	if err != nil {
		log.Fatal(err)
	}

	defer vm.Close()

	f, ok := vm.Exports[fName]
	if !ok {
		log.Fatalf("no exported function %q", fName)
	}

	ret, err := f()
	if err != nil {
		log.Fatal(err)
	}

	fmt.Printf("%q returned %v\n", fName, ret)
}