client: GetTransactionField, GetWalletBalance; update README

Author: outprog

README.md

@@ -28,7 +28,7 @@ func main() {
 	}
 
 	id, stat, err := wallet.SendWinston(
-		big.NewInt(1),
+		big.NewInt(1), // Winston amount
 		{{target}}, // target address
 		[]types.Tag{
 			types.Tag{
@@ -62,7 +62,7 @@ func main() {
 	}
 
 	id, stat, err := wallet.SendData(
-		[]byte("123"),
+		[]byte("123"), // Data bytes
 		[]types.Tag{
 			types.Tag{
 				Name:  "testSendData",
@@ -75,6 +75,42 @@ func main() {
 }
 ```
 
+### Golang Package
+
+#### client
+
+- [x] GetInfo
+- [x] GetTransactionByID
+- [x] GetTransactionField
+- [x] GetTransactionData
+- [x] GetTransactionPrice
+- [x] GetTransactionAnchor
+- [x] SubmitTransaction
+- [x] Arql
+- [x] GetWalletBalance
+- [x] GetLastTransactionID
+- [x] GetBlockByID
+- [x] GetBlockByHeight
+
+Initialize the instance:
+
+```golang
+arClient := New("https://arweave.net")
+```
+
+#### wallet
+
+- [x] SendAR
+- [x] SendWinston
+- [x] SendData
+- [x] SendTransaction
+
+Initialize the instance, use a keyfile.json:
+
+```golang
+arWallet := NewFromPath("./keyfile.json")
+```
+
 ### Development
 
 #### Test

client/client.go

@@ -5,12 +5,14 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"math/big"
 	"net/http"
 	"net/url"
 	"path"
 	"strconv"
 
 	"github.com/everFinance/goar/types"
+	"github.com/everFinance/goar/utils"
 )
 
 type Client struct {
@@ -52,7 +54,14 @@ func (c *Client) GetTransactionByID(id string) (tx *types.Transaction, status st
 }
 
 func (c *Client) GetTransactionField(id string, field string) (f string, err error) {
-	// TODO
+	url := fmt.Sprintf("tx/%v/%v", id, field)
+
+	body, statusCode, err := c.httpGet(url)
+	if statusCode != 200 {
+		err = fmt.Errorf("not found data")
+	}
+
+	f = string(body)
 	return
 }
 
@@ -112,8 +121,20 @@ func (c *Client) Arql(arql string) (ids []string, err error) {
 }
 
 // Wallet
-func (c *Client) GetWalletBalance(address string) (amount string, err error) {
-	// TODO
+func (c *Client) GetWalletBalance(address string) (arAmount *big.Float, err error) {
+	body, _, err := c.httpGet(fmt.Sprintf("wallet/%s/balance", address))
+	if err != nil {
+		return
+	}
+
+	winstomStr := string(body)
+	winstom, ok := new(big.Int).SetString(winstomStr, 10)
+	if !ok {
+		err = fmt.Errorf("invalid balance: %v", winstomStr)
+		return
+	}
+
+	arAmount = utils.WinstonToAR(winstom)
 	return
 }
 

client/client_test.go

@@ -62,3 +62,10 @@ package client
 // 		`),
 // 	)
 // }
+
+// func TestGetWalletBalance(t *testing.T) {
+// 	client := New("https://arweave.net")
+// 	fmt.Println(
+// 		client.GetWalletBalance("dQzTM9hXV5MD1fRniOKI3MvPF_-8b2XDLmpfcMN9hi8"),
+// 	)
+// }