premium: default premium rates

add default premium rates for BTC and LBTC swap operations

Author: YusukeShimizu

premium/premium.go

@@ -10,12 +10,29 @@ import (
 const (
 	// premiumRateParts is the total number of parts used to express fee rates.
 	premiumRateParts = 1e6
-	// defaultPremiumRatePPM is the default premium rate in ppm.
-	defaultPremiumRatePPM int64 = 0
+	// defaultBTCSwapInPremiumRatePPM is the default premium rate in ppm.
+	defaultBTCSwapInPremiumRatePPM int64 = 0
+	// defaultBTCSwapOutPremiumRatePPM is the default premium rate in ppm.
+	defaultBTCSwapOutPremiumRatePPM int64 = 2000
+	// defaultLBTCSwapInPremiumRatePPM is the default premium rate in ppm.
+	defaultLBTCSwapInPremiumRatePPM int64 = 0
+	// defaultLBTCSwapOutPremiumRatePPM is the default premium rate in ppm.
+	defaultLBTCSwapOutPremiumRatePPM int64 = 1000
 
 	premiumRatePPMKey = "premium_rate_ppm"
 )
 
+var defaultPremiumRate = map[AssetType]map[OperationType]int64{
+	BTC: {
+		SwapIn:  defaultBTCSwapInPremiumRatePPM,
+		SwapOut: defaultBTCSwapOutPremiumRatePPM,
+	},
+	LBTC: {
+		SwapIn:  defaultLBTCSwapInPremiumRatePPM,
+		SwapOut: defaultLBTCSwapOutPremiumRatePPM,
+	},
+}
+
 // Enum for supported asset types.
 type AssetType int32
 
@@ -178,7 +195,7 @@ func (p *Setting) GetDefaultRate(asset AssetType, operation OperationType) (*Pre
 	rate, err := p.store.GetDefaultRate(asset, operation)
 	if err != nil {
 		if errors.Is(err, ErrRateNotFound) {
-			return NewPremiumRate(asset, operation, NewPPM(defaultPremiumRatePPM))
+			return NewPremiumRate(asset, operation, NewPPM(defaultPremiumRate[asset][operation]))
 		}
 		return nil, err
 	}