refactor: plugin structure

plugin/common/go_plugin_test.go

@@ -0,0 +1,90 @@
+// +build linux freebsd darwin
+// go plugin doesn't support windows
+
+package common
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func buildGoPlugin() {
+	fmt.Println("[setup] build go plugin")
+	// flag -race is necessary in order to be consistent with go test
+	cmd := exec.Command("go", "build", "-buildmode=plugin", "-race",
+		"-o=debugtalk.so", "../../examples/plugin/debugtalk.go")
+	if err := cmd.Run(); err != nil {
+		panic(err)
+	}
+}
+
+func removeGoPlugin() {
+	fmt.Println("[teardown] remove go plugin")
+	os.Remove("debugtalk.so")
+}
+
+func TestLocatePlugin(t *testing.T) {
+	buildGoPlugin()
+	defer removeGoPlugin()
+
+	_, err := locateFile("../", goPluginFile)
+	if !assert.Error(t, err) {
+		t.Fail()
+	}
+
+	_, err = locateFile("", goPluginFile)
+	if !assert.Error(t, err) {
+		t.Fail()
+	}
+
+	startPath := "debugtalk.so"
+	_, err = locateFile(startPath, goPluginFile)
+	if !assert.Nil(t, err) {
+		t.Fail()
+	}
+
+	startPath = "call.go"
+	_, err = locateFile(startPath, goPluginFile)
+	if !assert.Nil(t, err) {
+		t.Fail()
+	}
+
+	startPath = "."
+	_, err = locateFile(startPath, goPluginFile)
+	if !assert.Nil(t, err) {
+		t.Fail()
+	}
+
+	startPath = "/abc"
+	_, err = locateFile(startPath, goPluginFile)
+	if !assert.Error(t, err) {
+		t.Fail()
+	}
+}
+
+func TestCallPluginFunction(t *testing.T) {
+	buildGoPlugin()
+	defer removeGoPlugin()
+
+	plugin, err := Init("debugtalk.so")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !assert.True(t, plugin.Has("Concatenate")) {
+		t.Fail()
+	}
+
+	// call function without arguments
+	result, err := plugin.Call("Concatenate", "1", 2, "3.14")
+	if !assert.NoError(t, err) {
+		t.Fail()
+	}
+	if !assert.Equal(t, "123.14", result) {
+		t.Fail()
+	}
+}