-
Notifications
You must be signed in to change notification settings - Fork 179
/
keeper.go
213 lines (181 loc) · 7.98 KB
/
keeper.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
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
package keeper
import (
"fmt"
"github.com/okex/exchain/x/common"
"github.com/tendermint/tendermint/libs/log"
"github.com/cosmos/cosmos-sdk/codec"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/okex/exchain/x/ammswap/types"
tokentypes "github.com/okex/exchain/x/token/types"
)
// Keeper of the swap store
type Keeper struct {
supplyKeeper types.SupplyKeeper
tokenKeeper types.TokenKeeper
storeKey sdk.StoreKey
cdc *codec.Codec
paramSpace types.ParamSubspace
ObserverKeeper []types.BackendKeeper
}
// NewKeeper creates a swap keeper
func NewKeeper(supplyKeeper types.SupplyKeeper, tokenKeeper types.TokenKeeper, cdc *codec.Codec, key sdk.StoreKey, paramspace types.ParamSubspace) Keeper {
keeper := Keeper{
supplyKeeper: supplyKeeper,
tokenKeeper: tokenKeeper,
storeKey: key,
cdc: cdc,
paramSpace: paramspace.WithKeyTable(types.ParamKeyTable()),
}
return keeper
}
// Logger returns a module-specific logger.
func (k Keeper) Logger(ctx sdk.Context) log.Logger {
return ctx.Logger().With("module", fmt.Sprintf("x/%s", types.ModuleName))
}
// GetSwapTokenPair gets SwapTokenPair with quote token name
func (k Keeper) GetSwapTokenPair(ctx sdk.Context, tokenPairName string) (types.SwapTokenPair, error) {
store := ctx.KVStore(k.storeKey)
var item types.SwapTokenPair
byteKey := types.GetTokenPairKey(tokenPairName)
rawItem := store.Get(byteKey)
if rawItem == nil {
return types.SwapTokenPair{}, types.ErrNonExistSwapTokenPair(tokenPairName)
}
err := k.cdc.UnmarshalBinaryLengthPrefixed(rawItem, &item)
if err != nil {
return types.SwapTokenPair{}, common.ErrUnMarshalJSONFailed(err.Error())
}
return item, nil
}
// SetSwapTokenPair sets the entire SwapTokenPair data struct for a quote token name
func (k Keeper) SetSwapTokenPair(ctx sdk.Context, tokenPairName string, swapTokenPair types.SwapTokenPair) {
store := ctx.KVStore(k.storeKey)
bz := k.cdc.MustMarshalBinaryLengthPrefixed(swapTokenPair)
store.Set(types.GetTokenPairKey(tokenPairName), bz)
}
// DeleteSwapTokenPair deletes the entire SwapTokenPair data struct for a quote token name
func (k Keeper) DeleteSwapTokenPair(ctx sdk.Context, tokenPairName string) {
store := ctx.KVStore(k.storeKey)
store.Delete(types.GetTokenPairKey(tokenPairName))
}
// GetSwapTokenPairsIterator get an iterator over all SwapTokenPairs in which the keys are the names and the values are the whois
func (k Keeper) GetSwapTokenPairsIterator(ctx sdk.Context) sdk.Iterator {
store := ctx.KVStore(k.storeKey)
return sdk.KVStorePrefixIterator(store, types.TokenPairPrefixKey)
}
func (k Keeper) GetSwapTokenPairs(ctx sdk.Context) []types.SwapTokenPair {
var result []types.SwapTokenPair
iterator := k.GetSwapTokenPairsIterator(ctx)
for ; iterator.Valid(); iterator.Next() {
tokenPair := types.SwapTokenPair{}
types.ModuleCdc.MustUnmarshalBinaryLengthPrefixed(iterator.Value(), &tokenPair)
result = append(result, tokenPair)
}
return result
}
// NewPoolToken new token
func (k Keeper) NewPoolToken(ctx sdk.Context, symbol string) {
poolToken := types.InitPoolToken(symbol)
k.tokenKeeper.NewToken(ctx, poolToken)
}
// GetPoolTokenInfo gets the token's info
func (k Keeper) GetPoolTokenInfo(ctx sdk.Context, symbol string) (tokentypes.Token, error) {
poolToken := k.tokenKeeper.GetTokenInfo(ctx, symbol)
if poolToken.Owner == nil {
return poolToken, types.ErrNonExistPoolToken(symbol)
}
return poolToken, nil
}
// GetPoolTokenAmount gets the amount of the specified poolToken name
func (k Keeper) GetPoolTokenAmount(ctx sdk.Context, poolTokenName string) sdk.Dec {
return k.supplyKeeper.GetSupplyByDenom(ctx, poolTokenName)
}
// MintPoolCoinsToUser mints coins and send them to the specified user address
func (k Keeper) MintPoolCoinsToUser(ctx sdk.Context, coins sdk.SysCoins, addr sdk.AccAddress) error {
err := k.supplyKeeper.MintCoins(ctx, types.ModuleName, coins)
if err != nil {
return types.ErrCodeMinCoinsFailed(err)
}
return k.supplyKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleName, addr, coins)
}
// BurnPoolCoinsFromUser sends coins to account module and burns them
func (k Keeper) BurnPoolCoinsFromUser(ctx sdk.Context, coins sdk.SysCoins, addr sdk.AccAddress) error {
err := k.supplyKeeper.SendCoinsFromAccountToModule(ctx, addr, types.ModuleName, coins)
if err != nil {
return types.ErrSendCoinsFromAccountToModule(err)
}
return k.supplyKeeper.BurnCoins(ctx, types.ModuleName, coins)
}
// SendCoinsToPool sends coins from user account to module account
func (k Keeper) SendCoinsToPool(ctx sdk.Context, coins sdk.SysCoins, addr sdk.AccAddress) error {
return k.supplyKeeper.SendCoinsFromAccountToModule(ctx, addr, types.ModuleName, coins)
}
// SendCoinsFromPoolToAccount sends coins from module account to user account
func (k Keeper) SendCoinsFromPoolToAccount(ctx sdk.Context, coins sdk.SysCoins, addr sdk.AccAddress) error {
return k.supplyKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleName, addr, coins)
}
// nolint
func (k Keeper) GetTokenKeeper() types.TokenKeeper {
return k.tokenKeeper
}
// GetParams gets inflation params from the global param store
func (k Keeper) GetParams(ctx sdk.Context) (params types.Params) {
k.paramSpace.GetParamSet(ctx, ¶ms)
return params
}
// SetParams sets inflation params from the global param store
func (k Keeper) SetParams(ctx sdk.Context, params types.Params) {
k.paramSpace.SetParamSet(ctx, ¶ms)
}
func (k Keeper) GetRedeemableAssets(ctx sdk.Context, baseAmountName, quoteAmountName string, liquidity sdk.Dec) (baseAmount, quoteAmount sdk.SysCoin, err error) {
err = types.ValidateBaseAndQuoteAmount(baseAmountName, quoteAmountName)
if err != nil {
return baseAmount, quoteAmount, types.ErrValidateSwapAmountName()
}
swapTokenPairName := types.GetSwapTokenPairName(baseAmountName, quoteAmountName)
swapTokenPair, err := k.GetSwapTokenPair(ctx, swapTokenPairName)
if err != nil {
return baseAmount, quoteAmount, err
}
poolTokenAmount := k.GetPoolTokenAmount(ctx, swapTokenPair.PoolTokenName)
if poolTokenAmount.LT(liquidity) {
return baseAmount, quoteAmount, types.ErrInsufficientPoolToken()
}
baseDec := common.MulAndQuo(swapTokenPair.BasePooledCoin.Amount, liquidity, poolTokenAmount)
quoteDec := common.MulAndQuo(swapTokenPair.QuotePooledCoin.Amount, liquidity, poolTokenAmount)
baseAmount = sdk.NewDecCoinFromDec(swapTokenPair.BasePooledCoin.Denom, baseDec)
quoteAmount = sdk.NewDecCoinFromDec(swapTokenPair.QuotePooledCoin.Denom, quoteDec)
return baseAmount, quoteAmount, nil
}
//CalculateTokenToBuy calculates the amount to buy
func CalculateTokenToBuy(swapTokenPair types.SwapTokenPair, sellToken sdk.SysCoin, buyTokenDenom string, params types.Params) sdk.SysCoin {
var inputReserve, outputReserve sdk.Dec
if buyTokenDenom < sellToken.Denom {
inputReserve = swapTokenPair.QuotePooledCoin.Amount
outputReserve = swapTokenPair.BasePooledCoin.Amount
} else {
inputReserve = swapTokenPair.BasePooledCoin.Amount
outputReserve = swapTokenPair.QuotePooledCoin.Amount
}
tokenBuyAmt := GetInputPrice(sellToken.Amount, inputReserve, outputReserve, params.FeeRate)
tokenBuy := sdk.NewDecCoinFromDec(buyTokenDenom, tokenBuyAmt)
return tokenBuy
}
func GetInputPrice(inputAmount, inputReserve, outputReserve, feeRate sdk.Dec) sdk.Dec {
inputAmountWithFee := inputAmount.MulTruncate(sdk.OneDec().Sub(feeRate).MulTruncate(sdk.NewDec(1000)))
denominator := inputReserve.MulTruncate(sdk.NewDec(1000)).Add(inputAmountWithFee)
return common.MulAndQuo(inputAmountWithFee, outputReserve, denominator)
}
func (k *Keeper) SetObserverKeeper(bk types.BackendKeeper) {
k.ObserverKeeper = append(k.ObserverKeeper, bk)
}
func (k Keeper) OnSwapToken(ctx sdk.Context, address sdk.AccAddress, swapTokenPair types.SwapTokenPair, sellAmount sdk.SysCoin, buyAmount sdk.SysCoin) {
for _, observer := range k.ObserverKeeper {
observer.OnSwapToken(ctx, address, swapTokenPair, sellAmount, buyAmount)
}
}
func (k Keeper) OnCreateExchange(ctx sdk.Context, swapTokenPair types.SwapTokenPair) {
for _, observer := range k.ObserverKeeper {
observer.OnSwapCreateExchange(ctx, swapTokenPair)
}
}