fix(): add pending tx api

Author: zyjblockchain

client.go

@@ -479,3 +479,18 @@ func (c *Client) GetUnconfirmedTx(arId string) (*types.Transaction, error) {
 	}
 	return tx, nil
 }
+
+func (c *Client) GetPendingTxIds() ([]string, error) {
+	body, statusCode, err := c.httpGet("/tx/pending")
+	if statusCode != 200 {
+		return nil, errors.New("get pending txIds failed")
+	}
+	if err != nil {
+		return nil, err
+	}
+	res := make([]string, 0)
+	if err := json.Unmarshal(body, &res); err != nil {
+		return nil, err
+	}
+	return res, nil
+}

client_test.go

@@ -258,3 +258,10 @@ func TestClient_GetUnconfirmedTxFromPeers(t *testing.T) {
 	assert.NoError(t, err)
 	t.Log(tx)
 }
+
+func TestNewClient(t *testing.T) {
+	cli := NewClient("https://arweave.net")
+	res, err := cli.GetPendingTxIds()
+	assert.NoError(t, err)
+	t.Log("pending tx number:", len(res))
+}