add JSONFind for json recursive find by key

common/testdata/TestJSONFind.golden

+[Janet Elliotte Jason]

common/tricks.go

@@ -25,6 +25,8 @@ import (
 	"path/filepath"
 	"reflect"
 	"sort"
+
+	"github.com/tidwall/gjson"
 )
 
 // GoldenDiff 从 gofmt 学来的测试方法
@@ -104,3 +106,16 @@ func SortedKey(m interface{}) []string {
 	sort.Strings(keys)
 	return keys
 }
+
+// JSONFind iterate find name in json
+func JSONFind(json string, name string, result *[]string) {
+	res := gjson.Parse(json)
+	res.ForEach(func(key, value gjson.Result) bool {
+		if key.String() == name {
+			*result = append(*result, value.String())
+		} else {
+			JSONFind(value.String(), name, result)
+		}
+		return true // keep iterating
+	})
+}

common/tricks_test.go

@@ -24,6 +24,7 @@ import (
 )
 
 func TestCaptureOutput(t *testing.T) {
+	Log.Debug("Entering function: %s", GetFunctionName())
 	c1 := make(chan string, 1)
 	// test output buf large than 65535
 	length := 1<<16 + 1
@@ -48,4 +49,36 @@ func TestCaptureOutput(t *testing.T) {
 	case <-time.After(1 * time.Second):
 		t.Error("capture timeout, pipe read hangup")
 	}
+	Log.Debug("Exiting function: %s", GetFunctionName())
+}
+
+func TestJSONFind(t *testing.T) {
+	Log.Debug("Entering function: %s", GetFunctionName())
+	jsons := []string{
+		`{
+  "programmers": [
+    {
+      "firstName": "Janet",
+      "lastName": "McLaughlin",
+    }, {
+      "firstName": "Elliotte",
+      "lastName": "Hunter",
+    }, {
+      "firstName": "Jason",
+      "lastName": "Harold",
+    }
+  ]
+}`,
+	}
+	err := GoldenDiff(func() {
+		for _, json := range jsons {
+			var result []string
+			JSONFind(json, "firstName", &result)
+			fmt.Println(result)
+		}
+	}, t.Name(), update)
+	if err != nil {
+		t.Error(err)
+	}
+	Log.Debug("Exiting function: %s", GetFunctionName())
 }