Refactor TxPage (#49)

* make TxPage explicit struct
* add empty page
* new from Txs

types/marshal.go

@@ -116,25 +116,9 @@ func (a *Amount) MarshalJSON() ([]byte, error) {
 }
 
 // Sort sorts the response by date, descending
-func (txs TxPage) Len() int           { return len(txs) }
-func (txs TxPage) Less(i, j int) bool { return txs[i].Date > txs[j].Date }
-func (txs TxPage) Swap(i, j int)      { txs[i], txs[j] = txs[j], txs[i] }
-
-// MarshalJSON returns a wrapped list of transactions in JSON
-func (r *TxPage) MarshalJSON() ([]byte, error) {
-	var page struct {
-		Total  int  `json:"total"`
-		Docs   []Tx `json:"docs"`
-		Status bool `json:"status"`
-	}
-	page.Docs = *r
-	if page.Docs == nil {
-		page.Docs = make([]Tx, 0)
-	}
-	page.Total = len(page.Docs)
-	page.Status = true
-	return json.Marshal(page)
-}
+func (txs Txs) Len() int           { return len(txs) }
+func (txs Txs) Less(i, j int) bool { return txs[i].Date > txs[j].Date }
+func (txs Txs) Swap(i, j int)      { txs[i], txs[j] = txs[j], txs[i] }
 
 // MarshalJSON returns a wrapped list of collections in JSON
 func (r CollectionPage) MarshalJSON() ([]byte, error) {

types/marshal_test.go

@@ -71,12 +71,12 @@ func TestTx_MarshalJSON(t *testing.T) {
 func TestSortTxPage(t *testing.T) {
 	tests := []struct {
 		name string
-		page TxPage
-		want TxPage
+		page Txs
+		want Txs
 	}{
-		{"test sort 1", TxPage{{Date: 5}, {Date: 2}, {Date: 1}, {Date: 4}, {Date: 3}}, TxPage{{Date: 5}, {Date: 4}, {Date: 3}, {Date: 2}, {Date: 1}}},
-		{"test sort 2", TxPage{{Date: 100}, {Date: 2}, {Date: 33}, {Date: 409}}, TxPage{{Date: 409}, {Date: 100}, {Date: 33}, {Date: 2}}},
-		{"test sort 3", TxPage{{Date: 100}, {Date: 2}, {Date: 100}}, TxPage{{Date: 100}, {Date: 100}, {Date: 2}}},
+		{"test sort 1", Txs{{Date: 5}, {Date: 2}, {Date: 1}, {Date: 4}, {Date: 3}}, Txs{{Date: 5}, {Date: 4}, {Date: 3}, {Date: 2}, {Date: 1}}},
+		{"test sort 2", Txs{{Date: 100}, {Date: 2}, {Date: 33}, {Date: 409}}, Txs{{Date: 409}, {Date: 100}, {Date: 33}, {Date: 2}}},
+		{"test sort 3", Txs{{Date: 100}, {Date: 2}, {Date: 100}}, Txs{{Date: 100}, {Date: 100}, {Date: 2}}},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {

types/tx.go

@@ -61,9 +61,11 @@ type (
 		Txs    []Tx  `json:"txs"`
 	}
 
-	// TxPage is a page of transactions
-	TxPage []Tx
-
+	TxPage struct {
+		Total  int  `json:"total"`
+		Docs   []Tx `json:"docs"`
+		Status bool `json:"status"`
+	}
 	// Amount is a positive decimal integer string.
 	// It is written in the smallest possible unit (e.g. Wei, Satoshis)
 	Amount string
@@ -199,6 +201,21 @@ type (
 	Txs []Tx
 )
 
+var (
+	EmptyTxPage = TxPage{Total: 0, Docs: Txs{}, Status: true}
+)
+
+func NewTxPage(txs Txs) TxPage {
+	if txs == nil {
+		txs = Txs{}
+	}
+	return TxPage{
+		Total:  len(txs),
+		Docs:   txs,
+		Status: true,
+	}
+}
+
 func (t Token) AssetId() string {
 	return asset.BuildID(t.Coin, t.TokenID)
 }
@@ -215,8 +232,8 @@ func (txs Txs) FilterUniqueID() Txs {
 	return list
 }
 
-func (txs TxPage) FilterTransactionsByMemo() TxPage {
-	result := make(TxPage, 0)
+func (txs Txs) FilterTransactionsByMemo() Txs {
+	result := make(Txs, 0)
 	for _, tx := range txs {
 		if !AllowMemo(tx.Memo) {
 			tx.Memo = ""
@@ -244,8 +261,8 @@ func AllowMemo(memo string) bool {
 	return err == nil
 }
 
-func (txs TxPage) FilterTransactionsByToken(token string) TxPage {
-	result := make(TxPage, 0)
+func (txs Txs) FilterTransactionsByToken(token string) Txs {
+	result := make(Txs, 0)
 	for _, tx := range txs {
 		switch tx.Meta.(type) {
 		case TokenTransfer:

types/tx_test.go

@@ -659,7 +659,7 @@ var (
 )
 
 func Test_filterTransactionsByToken(t *testing.T) {
-	var p TxPage
+	var p Txs
 	assert.Nil(t, json.Unmarshal([]byte(beforeTransactionsToken), &p))
 	result := p.FilterTransactionsByToken("BUSD-BD1")
 	rawResult, err := json.Marshal(result)
@@ -701,33 +701,33 @@ func Test_AllowMemo(t *testing.T) {
 	}
 }
 
-func TestTxPage_FilterTransactionsByMemo(t *testing.T) {
+func TestTxs_FilterTransactionsByMemo(t *testing.T) {
 	tests := []struct {
 		name string
-		txs  TxPage
-		want TxPage
+		txs  Txs
+		want Txs
 	}{
 		{
 			name: "Allow memo",
-			txs: TxPage{
+			txs: Txs{
 				{
 					Memo: "123",
 				},
 			},
-			want: TxPage{
+			want: Txs{
 				{
 					Memo: "123",
 				},
 			},
 		},
 		{
 			name: "Disallow memo",
-			txs: TxPage{
+			txs: Txs{
 				{
 					Memo: "test",
 				},
 			},
-			want: TxPage{
+			want: Txs{
 				{
 					Memo: "",
 				},