-
Notifications
You must be signed in to change notification settings - Fork 4
/
estimate_coin_sell.go
115 lines (96 loc) · 3.55 KB
/
estimate_coin_sell.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
package api
import (
"encoding/json"
"fmt"
"github.com/MinterTeam/minter-go-node/core/code"
"github.com/MinterTeam/minter-go-node/core/commissions"
"github.com/MinterTeam/minter-go-node/core/transaction"
"github.com/MinterTeam/minter-go-node/core/types"
"github.com/MinterTeam/minter-go-node/formula"
"math/big"
"net/http"
)
type EstimateCoinSellResponse struct {
WillGet string `json:"will_get"`
Commission string `json:"commission"`
}
func EstimateCoinSell(w http.ResponseWriter, r *http.Request) {
cState := GetStateForRequest(r)
query := r.URL.Query()
coinToSell := query.Get("coin_to_sell")
coinToBuy := query.Get("coin_to_buy")
valueToSell, _ := big.NewInt(0).SetString(query.Get("value_to_sell"), 10)
var coinToSellSymbol types.CoinSymbol
copy(coinToSellSymbol[:], []byte(coinToSell))
var coinToBuySymbol types.CoinSymbol
copy(coinToBuySymbol[:], []byte(coinToBuy))
var result *big.Int
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
if coinToSell == coinToBuy {
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(Response{
Code: code.CrossConvert,
Log: fmt.Sprintf("\"From\" coin equals to \"to\" coin"),
})
return
}
if !cState.CoinExists(coinToSellSymbol) {
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(Response{
Code: code.CrossConvert,
Log: fmt.Sprintf("Coin to sell not exists"),
})
return
}
if !cState.CoinExists(coinToBuySymbol) {
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(Response{
Code: code.CrossConvert,
Log: fmt.Sprintf("Coin to buy not exists"),
})
return
}
commissionInBaseCoin := big.NewInt(commissions.ConvertTx)
commissionInBaseCoin.Mul(commissionInBaseCoin, transaction.CommissionMultiplier)
commission := big.NewInt(0).Set(commissionInBaseCoin)
if coinToSellSymbol != types.GetBaseCoin() {
coin := cState.GetStateCoin(coinToSellSymbol)
if coin.ReserveBalance().Cmp(commissionInBaseCoin) < 0 {
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(Response{
Code: 1,
Log: fmt.Sprintf("Coin reserve balance is not sufficient for transaction. Has: %s, required %s", coin.ReserveBalance().String(), commissionInBaseCoin.String()),
})
return
}
if coin.Volume().Cmp(valueToSell) < 0 {
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(Response{
Code: 1,
Log: fmt.Sprintf("Coin volume is not sufficient for transaction. Has: %s, required %s", coin.Volume().String(), valueToSell.String()),
})
return
}
commission = formula.CalculateSaleAmount(coin.Volume(), coin.ReserveBalance(), coin.Data().Crr, commissionInBaseCoin)
}
if coinToSellSymbol == types.GetBaseCoin() {
coin := cState.GetStateCoin(coinToBuySymbol).Data()
result = formula.CalculatePurchaseReturn(coin.Volume, coin.ReserveBalance, coin.Crr, valueToSell)
} else if coinToBuySymbol == types.GetBaseCoin() {
coin := cState.GetStateCoin(coinToSellSymbol).Data()
result = formula.CalculateSaleReturn(coin.Volume, coin.ReserveBalance, coin.Crr, valueToSell)
} else {
coinFrom := cState.GetStateCoin(coinToSellSymbol).Data()
coinTo := cState.GetStateCoin(coinToBuySymbol).Data()
basecoinValue := formula.CalculateSaleReturn(coinFrom.Volume, coinFrom.ReserveBalance, coinFrom.Crr, valueToSell)
result = formula.CalculatePurchaseReturn(coinTo.Volume, coinTo.ReserveBalance, coinTo.Crr, basecoinValue)
}
w.WriteHeader(http.StatusOK)
json.NewEncoder(w).Encode(Response{
Code: 0,
Result: EstimateCoinSellResponse{
WillGet: result.String(),
Commission: commission.String(),
},
})
}