poloniex balance draft

[perso/Immae/Projets/Cryptomonnaies/Cryptoportfolio/Front.git] / markets / poloniex.go

diff --git a/markets/poloniex.go b/markets/poloniex.go
new file mode 100644 (file)
index 0000000..c55a3da
--- /dev/null
+++ b/markets/poloniex.go
@@ -0,0 +1,149 @@
+package markets
+
+import (
+       "fmt"
+
+       "github.com/jloup/poloniex"
+       "github.com/shopspring/decimal"
+)
+
+type CurrencyPair struct {
+       Name string
+       Rate decimal.Decimal
+}
+
+type Poloniex struct {
+       TickerCache map[string]CurrencyPair
+
+       publicClient     *poloniex.Poloniex
+       updateTickerChan chan CurrencyPair
+}
+
+func NewPoloniex() *Poloniex {
+       client, _ := poloniex.NewClient("", "")
+
+       return &Poloniex{
+               TickerCache:      make(map[string]CurrencyPair),
+               updateTickerChan: nil,
+               publicClient:     client,
+       }
+}
+
+func (p *Poloniex) GetBalance(apiKey, apiSecret, base_currency string) (decimal.Decimal, error) {
+       client, _ := poloniex.NewClient(apiKey, apiSecret)
+
+       accounts, err := client.TradeReturnAvailableAccountBalances()
+       if err != nil {
+               return decimal.Zero, err
+       }
+
+       marginBalance, err := p.computeAccountBalance(accounts.Margin, base_currency)
+       if err != nil {
+               return decimal.Zero, err
+       }
+
+       exchangeBalance, err := p.computeAccountBalance(accounts.Exchange, base_currency)
+       if err != nil {
+               return decimal.Zero, err
+       }
+
+       return decimal.Sum(marginBalance, exchangeBalance), nil
+}
+
+func (p *Poloniex) computeAccountBalance(account map[string]decimal.Decimal, base_currency string) (decimal.Decimal, error) {
+       var total decimal.Decimal
+
+       for currency, amount := range account {
+               pair, err := p.GetCurrencyPair(base_currency, currency)
+               if err != nil {
+                       return decimal.Zero, err
+               }
+
+               total = total.Add(amount.Mul(pair.Rate))
+       }
+
+       return total, nil
+}
+
+func (p *Poloniex) GetCurrencyPair(curr1, curr2 string) (CurrencyPair, error) {
+       pairName := fmt.Sprintf("%s_%s", curr1, curr2)
+
+       fmt.Println(pairName)
+       if curr1 == curr2 {
+               return CurrencyPair{pairName, decimal.NewFromFloat(1.0)}, nil
+       }
+
+       pair, ok := p.TickerCache[pairName]
+       if !ok {
+               pair, err := p.fetchTicker(pairName)
+               if err != nil {
+                       return CurrencyPair{}, err
+               }
+
+               return pair, nil
+       }
+
+       return pair, nil
+}
+
+func (p *Poloniex) fetchTicker(pair string) (CurrencyPair, error) {
+       tickers, err := p.publicClient.PubReturnTickers()
+       if err != nil {
+               return CurrencyPair{}, err
+       }
+
+       if ticker, ok := tickers[pair]; ok {
+               pair := CurrencyPair{Name: pair, Rate: ticker.Last}
+
+               if p.updateTickerChan != nil {
+                       p.updateTickerChan <- pair
+               }
+
+               return pair, nil
+       } else {
+               return CurrencyPair{}, fmt.Errorf("pair '%v' not in tickers", pair)
+       }
+}
+
+func (p *Poloniex) StartTicker() error {
+       stream, err := poloniex.NewWSClient()
+       if err != nil {
+               return err
+       }
+
+       err = stream.SubscribeTicker()
+       if err != nil {
+               return err
+       }
+
+       p.updateTickerChan = make(chan CurrencyPair)
+
+       go func() {
+               for {
+                       quit := false
+                       select {
+                       case data, ok := <-stream.Subs["ticker"]:
+                               if !ok {
+                                       quit = true
+                               } else {
+                                       ticker := data.(poloniex.WSTicker)
+                                       p.TickerCache[ticker.CurrencyPair] = CurrencyPair{Name: ticker.CurrencyPair, Rate: decimal.NewFromFloat(ticker.Last)}
+                               }
+
+                       case pair, ok := <-p.updateTickerChan:
+                               if !ok {
+                                       quit = true
+                               } else {
+                                       p.TickerCache[pair.Name] = pair
+                               }
+                       }
+                       if quit {
+                               //TODO: logit
+                               p.updateTickerChan = nil
+                               break
+                       }
+               }
+       }()
+
+       return nil
+}