compiler: implement engine.AppCall interop

pkg/compiler/interop_test.go

@@ -0,0 +1,76 @@
+package compiler_test
+
+import (
+	"fmt"
+	"math/big"
+	"strings"
+	"testing"
+
+	"github.com/CityOfZion/neo-go/pkg/compiler"
+	"github.com/CityOfZion/neo-go/pkg/crypto/hash"
+	"github.com/CityOfZion/neo-go/pkg/util"
+	"github.com/stretchr/testify/require"
+)
+
+func TestAppCall(t *testing.T) {
+	srcInner := `
+	package foo
+	func Main(args []interface{}) int {
+		a := args[0].(int)
+		b := args[1].(int)
+		return a + b
+	}
+	`
+
+	inner, err := compiler.Compile(strings.NewReader(srcInner))
+	require.NoError(t, err)
+
+	ih := hash.Hash160(inner)
+	getScript := func(u util.Uint160) []byte {
+		if u.Equals(ih) {
+			return inner
+		}
+		return nil
+	}
+
+	t.Run("valid script", func(t *testing.T) {
+		src := getAppCallScript(fmt.Sprintf("%#v", ih.BytesBE()))
+		v := vmAndCompile(t, src)
+		v.SetScriptGetter(getScript)
+
+		require.NoError(t, v.Run())
+
+		assertResult(t, v, big.NewInt(42))
+	})
+
+	t.Run("missing script", func(t *testing.T) {
+		h := ih
+		h[0] = ^h[0]
+
+		src := getAppCallScript(fmt.Sprintf("%#v", h.BytesBE()))
+		v := vmAndCompile(t, src)
+		v.SetScriptGetter(getScript)
+
+		require.Error(t, v.Run())
+	})
+
+	t.Run("invalid script address", func(t *testing.T) {
+		src := getAppCallScript("[]byte{1, 2, 3}")
+
+		_, err := compiler.Compile(strings.NewReader(src))
+		require.Error(t, err)
+	})
+}
+
+func getAppCallScript(h string) string {
+	return `
+	package foo
+	import "github.com/CityOfZion/neo-go/pkg/interop/engine"
+	func Main() int {
+		x := 13
+		y := 29
+		result := engine.AppCall(` + h + `, []interface{}{x, y})
+		return result.(int)
+	}
+	`
+}