revert changes

tools/goctl/rpc/generator/defaultgenerator.go

@@ -1,6 +1,8 @@
 package generator
 
 import (
+	"os/exec"
+
 	"github.com/tal-tech/go-zero/tools/goctl/util/console"
 )
 
@@ -19,3 +21,21 @@ func NewDefaultGenerator() Generator {
 		log: log,
 	}
 }
+
+// Prepare provides environment detection generated by rpc service,
+// including go environment, protoc, whether protoc-gen-go is installed or not
+func (g *DefaultGenerator) Prepare() error {
+	_, err := exec.LookPath("go")
+	if err != nil {
+		return err
+	}
+
+	_, err = exec.LookPath("protoc")
+	if err != nil {
+		return err
+	}
+
+	_, err = exec.LookPath("protoc-gen-go")
+
+	return err
+}