Add binance client (#13)

* Add binance client

* Add binance client

* Improve client and clean code

* Improve client and clean code

* Add sugar
Clean code

* Add contract address

* Update client.go

* Update client.go

* Update client.go

Co-authored-by: Viktor Radchenko <1641795+vikmeup@users.noreply.github.com>

blockchain/binance/client.go

@@ -0,0 +1,51 @@
+package binance
+
+import (
+	"fmt"
+	"net/url"
+	"strconv"
+	"time"
+
+	"github.com/trustwallet/golibs/client"
+)
+
+type Client struct {
+	req client.Request
+}
+
+func InitClient(url, apiKey string) Client {
+	request := client.InitJSONClient(url)
+	request.AddHeader("apikey", apiKey)
+	return Client{
+		req: request,
+	}
+}
+
+func (c Client) FetchNodeInfo() (result NodeInfoResponse, err error) {
+	err = c.req.Get(&result, "api/v1/node-info", nil)
+	return result, err
+}
+
+func (c Client) FetchTransactionsInBlock(blockNumber int64) (result TransactionsInBlockResponse, err error) {
+	err = c.req.Get(&result, fmt.Sprintf("api/v2/transactions-in-block/%d", blockNumber), nil)
+	return result, err
+}
+
+func (c Client) FetchTransactionsByAddressAndTokenID(address, tokenID string, limit int) ([]Tx, error) {
+	startTime := strconv.Itoa(int(time.Now().AddDate(0, -3, 0).Unix() * 1000))
+	params := url.Values{"address": {address}, "txAsset": {tokenID}, "startTime": {startTime}, "limit": {strconv.Itoa(limit)}}
+	var result TransactionsInBlockResponse
+	err := c.req.Get(&result, "api/v1/transactions", params)
+	return result.Tx, err
+}
+
+func (c Client) FetchAccountMeta(address string) (result AccountMeta, err error) {
+	err = c.req.Get(&result, fmt.Sprintf("api/v1/account/%s", address), nil)
+	return result, err
+}
+
+func (c Client) FetchTokens(limit int) (result Tokens, err error) {
+	query := url.Values{"limit": {strconv.Itoa(limit)}}
+	err = c.req.Get(&result, "api/v1/tokens", query)
+	return result, err
+}

blockchain/binance/model.go

@@ -0,0 +1,82 @@
+package binance
+
+import "time"
+
+type (
+	NodeInfoResponse struct {
+		SyncInfo struct {
+			LatestBlockHeight int `json:"latest_block_height"`
+		} `json:"sync_info"`
+	}
+
+	TransactionsInBlockResponse struct {
+		BlockHeight int  `json:"blockHeight"`
+		Tx          []Tx `json:"tx"`
+	}
+
+	TxType string
+
+	Tx struct {
+		TxHash          string            `json:"txHash"`
+		BlockHeight     int               `json:"blockHeight"`
+		TxType          TxType            `json:"txType"`
+		TimeStamp       time.Time         `json:"timeStamp"`
+		FromAddr        interface{}       `json:"fromAddr"`
+		ToAddr          interface{}       `json:"toAddr"`
+		Value           string            `json:"value"`
+		TxAsset         string            `json:"txAsset"`
+		TxFee           string            `json:"txFee"`
+		OrderID         string            `json:"orderId,omitempty"`
+		Code            int               `json:"code"`
+		Data            string            `json:"data"`
+		Memo            string            `json:"memo"`
+		Source          int               `json:"source"`
+		SubTransactions []SubTransactions `json:"subTransactions,omitempty"`
+		Sequence        int               `json:"sequence"`
+	}
+
+	TransactionData struct {
+		OrderData struct {
+			Symbol      string `json:"symbol"`
+			OrderType   string `json:"orderType"`
+			Side        string `json:"side"`
+			Price       string `json:"price"`
+			Quantity    string `json:"quantity"`
+			TimeInForce string `json:"timeInForce"`
+			OrderID     string `json:"orderId"`
+		} `json:"orderData"`
+	}
+
+	SubTransactions struct {
+		TxHash      string `json:"txHash"`
+		BlockHeight int    `json:"blockHeight"`
+		TxType      string `json:"txType"`
+		FromAddr    string `json:"fromAddr"`
+		ToAddr      string `json:"toAddr"`
+		TxAsset     string `json:"txAsset"`
+		TxFee       string `json:"txFee"`
+		Value       string `json:"value"`
+	}
+
+	AccountMeta struct {
+		Balances []TokenBalance `json:"balances"`
+	}
+
+	TokenBalance struct {
+		Free   string `json:"free"`
+		Frozen string `json:"frozen"`
+		Locked string `json:"locked"`
+		Symbol string `json:"symbol"`
+	}
+
+	Tokens []Token
+
+	Token struct {
+		ContractAddress string `json:"contract_address"`
+		Name            string `json:"name"`
+		OriginalSymbol  string `json:"original_symbol"`
+		Owner           string `json:"owner"`
+		Symbol          string `json:"symbol"`
+		TotalSupply     string `json:"total_supply"`
+	}
+)

client/client.go

@@ -54,6 +54,10 @@ var DefaultErrorHandler = func(res *http.Response, uri string) error {
 	return nil
 }
 
+func (r *Request) AddHeader(key string, value string) {
+	r.Headers[key] = value
+}
+
 func (r *Request) GetWithContext(result interface{}, path string, query url.Values, ctx context.Context) error {
 	var queryStr = ""
 	if query != nil {