forked from bitfinexcom/bitfinex-api-go
/
client.go
245 lines (207 loc) · 5.92 KB
/
client.go
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// Package bitfinex is the official client to access to bitfinex.com API
package bitfinex
import (
"crypto/hmac"
"crypto/sha512"
"encoding/base64"
"encoding/hex"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"github.com/outprog/bitfinex-api-go/utils"
)
const (
// BaseURL is the v1 REST endpoint.
BaseURL = "https://api.bitfinex.com/v1/"
// WebSocketURL the v1 Websocket endpoint.
WebSocketURL = "wss://api-pub.bitfinex.com/ws/"
)
// Client manages all the communication with the Bitfinex API.
type Client struct {
// Base URL for API requests.
BaseURL *url.URL
WebSocketURL string
WebSocketTLSSkipVerify bool
// Auth data
APIKey string
APISecret string
// Services
Pairs *PairsService
Stats *StatsService
Ticker *TickerService
Account *AccountService
Balances *BalancesService
Offers *OffersService
Credits *CreditsService
Deposit *DepositService
Lendbook *LendbookService
MarginInfo *MarginInfoService
MarginFunding *MarginFundingService
OrderBook *OrderBookService
Orders *OrderService
Trades *TradesService
Positions *PositionsService
History *HistoryService
WebSocket *WebSocketService
Wallet *WalletService
}
// NewClient creates new Bitfinex.com API client.
func NewClient() *Client {
baseURL, _ := url.Parse(BaseURL)
c := &Client{BaseURL: baseURL, WebSocketURL: WebSocketURL}
c.Pairs = &PairsService{client: c}
c.Stats = &StatsService{client: c}
c.Account = &AccountService{client: c}
c.Ticker = &TickerService{client: c}
c.Balances = &BalancesService{client: c}
c.Offers = &OffersService{client: c}
c.Credits = &CreditsService{client: c}
c.Deposit = &DepositService{client: c}
c.Lendbook = &LendbookService{client: c}
c.MarginInfo = &MarginInfoService{client: c}
c.MarginFunding = &MarginFundingService{client: c}
c.OrderBook = &OrderBookService{client: c}
c.Orders = &OrderService{client: c}
c.History = &HistoryService{client: c}
c.Trades = &TradesService{client: c}
c.Positions = &PositionsService{client: c}
c.Wallet = &WalletService{client: c}
c.WebSocket = NewWebSocketService(c)
c.WebSocketTLSSkipVerify = false
return c
}
// NewRequest create new API request. Relative url can be provided in refURL.
func (c *Client) newRequest(method string, refURL string, params url.Values) (*http.Request, error) {
rel, err := url.Parse(refURL)
if err != nil {
return nil, err
}
if params != nil {
rel.RawQuery = params.Encode()
}
var req *http.Request
u := c.BaseURL.ResolveReference(rel)
req, err = http.NewRequest(method, u.String(), nil)
if err != nil {
return nil, err
}
return req, nil
}
// newAuthenticatedRequest creates new http request for authenticated routes.
func (c *Client) newAuthenticatedRequest(m string, refURL string, data map[string]interface{}) (*http.Request, error) {
req, err := c.newRequest(m, refURL, nil)
if err != nil {
return nil, err
}
nonce := utils.GetNonce()
payload := map[string]interface{}{
"request": "/v1/" + refURL,
"nonce": nonce,
}
for k, v := range data {
payload[k] = v
}
p, err := json.Marshal(payload)
if err != nil {
return nil, err
}
encoded := base64.StdEncoding.EncodeToString(p)
req.Header.Add("Content-Type", "application/json")
req.Header.Add("Accept", "application/json")
req.Header.Add("X-BFX-APIKEY", c.APIKey)
req.Header.Add("X-BFX-PAYLOAD", encoded)
sig, err := c.signPayload(encoded)
if err != nil {
return nil, err
}
req.Header.Add("X-BFX-SIGNATURE", sig)
return req, nil
}
func (c *Client) signPayload(payload string) (string, error) {
sig := hmac.New(sha512.New384, []byte(c.APISecret))
_, err := sig.Write([]byte(payload))
if err != nil {
return "", err
}
return hex.EncodeToString(sig.Sum(nil)), nil
}
// Auth sets api key and secret for usage is requests that requires authentication.
func (c *Client) Auth(key string, secret string) *Client {
c.APIKey = key
c.APISecret = secret
return c
}
var httpDo = func(req *http.Request) (*http.Response, error) {
return http.DefaultClient.Do(req)
}
// Do executes API request created by NewRequest method or custom *http.Request.
func (c *Client) do(req *http.Request, v interface{}) (*Response, error) {
resp, err := httpDo(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
response := newResponse(resp)
err = checkResponse(response)
if err != nil {
// Return response in case caller need to debug it.
return response, err
}
if v != nil {
err = json.Unmarshal(response.Body, v)
if err != nil {
return response, err
}
}
return response, nil
}
// Response is wrapper for standard http.Response and provides
// more methods.
type Response struct {
Response *http.Response
Body []byte
}
// newResponse creates new wrapper.
func newResponse(r *http.Response) *Response {
body, err := ioutil.ReadAll(r.Body)
if err != nil {
body = []byte(`Error reading body:` + err.Error())
}
return &Response{r, body}
}
// String converts response body to string.
// An empty string will be returned if error.
func (r *Response) String() string {
return string(r.Body)
}
// ErrorResponse is the custom error type that is returned if the API returns an
// error.
type ErrorResponse struct {
Response *Response
Message string `json:"message"`
}
func (r *ErrorResponse) Error() string {
return fmt.Sprintf("%v %v: %d %v",
r.Response.Response.Request.Method,
r.Response.Response.Request.URL,
r.Response.Response.StatusCode,
r.Message,
)
}
// checkResponse checks response status code and response
// for errors.
func checkResponse(r *Response) error {
if c := r.Response.StatusCode; 200 <= c && c <= 299 {
return nil
}
// Try to decode error message
errorResponse := &ErrorResponse{Response: r}
err := json.Unmarshal(r.Body, errorResponse)
if err != nil {
errorResponse.Message = "Error decoding response error message. " +
"Please see response body for more information."
}
return errorResponse
}