consul config source support 1st-level array

Check whetehr the 1st level encoded json is array or not, to
support 1st level array in consul config.

During debug, i suspected the incapability of arrray is caused by
json reader, so i added test for array. I think it makes no harm
to also check that in.

config/reader/json/values_test.go

@@ -1,39 +1,85 @@
 package json
 
 import (
+	"reflect"
 	"testing"
 
 	"github.com/micro/go-micro/config/source"
 )
 
 func TestValues(t *testing.T) {
-	data := []byte(`{"foo": "bar", "baz": {"bar": "cat"}}`)
-
+	emptyStr := ""
 	testData := []struct {
+		csdata   []byte
 		path     []string
-		value string
+		accepter interface{}
+		value    interface{}
 	}{
 		{
+			[]byte(`{"foo": "bar", "baz": {"bar": "cat"}}`),
 			[]string{"foo"},
+			emptyStr,
 			"bar",
 		},
 		{
+			[]byte(`{"foo": "bar", "baz": {"bar": "cat"}}`),
 			[]string{"baz", "bar"},
+			emptyStr,
 			"cat",
 		},
 	}
 
+	for idx, test := range testData {
 		values, err := newValues(&source.ChangeSet{
-		Data: data,
+			Data: test.csdata,
 		})
-
 		if err != nil {
 			t.Fatal(err)
 		}
 
-	for _, test := range testData {
-		if v := values.Get(test.path...).String(""); v != test.value {
-			t.Fatalf("Expected %s got %s for path %v", test.value, v, test.path)
+		err = values.Get(test.path...).Scan(&test.accepter)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if test.accepter != test.value {
+			t.Fatalf("No.%d Expected %v got %v for path %v", idx, test.value, test.accepter, test.path)
+		}
+	}
+}
+
+func TestStructArray(t *testing.T) {
+	type T struct {
+		Foo string
+	}
+
+	emptyTSlice := []T{}
+
+	testData := []struct {
+		csdata   []byte
+		accepter []T
+		value    []T
+	}{
+		{
+			[]byte(`[{"foo": "bar"}]`),
+			emptyTSlice,
+			[]T{T{Foo: "bar"}},
+		},
+	}
+
+	for idx, test := range testData {
+		values, err := newValues(&source.ChangeSet{
+			Data: test.csdata,
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		err = values.Get().Scan(&test.accepter)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !reflect.DeepEqual(test.accepter, test.value) {
+			t.Fatalf("No.%d Expected %v got %v", idx, test.value, test.accepter)
 		}
 	}
 }

config/source/consul/util.go

@@ -8,40 +8,78 @@ import (
 	"github.com/micro/go-micro/config/encoder"
 )
 
+type jsonValue interface {
+	Value() interface{}
+	Decode(encoder.Encoder, []byte) (jsonValue, error)
+}
+type jsonArrayValue []interface{}
+type jsonMapValue map[string]interface{}
+
+func (a jsonArrayValue) Value() interface{} { return a }
+func (a jsonArrayValue) Decode(e encoder.Encoder, b []byte) (jsonValue, error) {
+	v := jsonArrayValue{}
+	err := e.Decode(b, &v)
+	return v, err
+}
+func (m jsonMapValue) Value() interface{} { return m }
+func (m jsonMapValue) Decode(e encoder.Encoder, b []byte) (jsonValue, error) {
+	v := jsonMapValue{}
+	err := e.Decode(b, &v)
+	return v, err
+}
+
 func makeMap(e encoder.Encoder, kv api.KVPairs, stripPrefix string) (map[string]interface{}, error) {
+
 	data := make(map[string]interface{})
 
 	// consul guarantees lexicographic order, so no need to sort
 	for _, v := range kv {
 		pathString := strings.TrimPrefix(strings.TrimPrefix(v.Key, stripPrefix), "/")
-		var val map[string]interface{}
+		if pathString == "" {
+			continue
+		}
+		var val jsonValue
+		var err error
 
 		// ensure a valid value is stored at this location
 		if len(v.Value) > 0 {
-			if err := e.Decode(v.Value, &val); err != nil {
+			// check whether this is an array
+			if v.Value[0] == 91 && v.Value[len(v.Value)-1] == 93 {
+				val = jsonArrayValue{}
+				if val, err = val.Decode(e, v.Value); err != nil {
+					return nil, fmt.Errorf("faild decode value. path: %s, error: %s", pathString, err)
+				}
+			} else {
+				val = jsonMapValue{}
+				if val, err = val.Decode(e, v.Value); err != nil {
 					return nil, fmt.Errorf("faild decode value. path: %s, error: %s", pathString, err)
 				}
 			}
+		}
 
-		// set target at the root
 		target := data
-
-		// then descend to the target location, creating as we go, if need be
-		if pathString != "" {
 		path := strings.Split(pathString, "/")
-			// find (or create) the location we want to put this value at
-			for _, dir := range path {
+		// find (or create) the leaf node we want to put this value at
+		for _, dir := range path[:len(path)-1] {
 			if _, ok := target[dir]; !ok {
 				target[dir] = make(map[string]interface{})
 			}
 			target = target[dir].(map[string]interface{})
 		}
 
-		}
+		leafDir := path[len(path)-1]
 
 		// copy over the keys from the value
-		for k := range val {
-			target[k] = val[k]
+		switch val.(type) {
+		case jsonArrayValue:
+			target[leafDir] = val.Value()
+		case jsonMapValue:
+			target[leafDir] = make(map[string]interface{})
+			target = target[leafDir].(map[string]interface{})
+			mapv := val.Value().(jsonMapValue)
+			for k := range mapv {
+				target[k] = mapv[k]
+			}
 		}
 	}