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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| package raiju | ||
|
|
||
| import ( | ||
| "errors" | ||
|
|
||
| "github.com/nyonson/raiju/lightning" | ||
| ) | ||
|
|
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| // LiquidityFees for channels. | ||
| // | ||
| // Defining channel liquidity percentage based on (local capacity / total capacity). | ||
| // When liquidity is low, there is too much inbound. | ||
| // When liquidity is high, there is too much outbound. | ||
| type LiquidityFees struct { | ||
| thresholds []float64 | ||
| fees []lightning.FeePPM | ||
| } | ||
|
|
||
| // Fee for channel based on its current liquidity. | ||
| func (lf LiquidityFees) Fee(channel lightning.Channel) lightning.FeePPM { | ||
| liquidity := float64(channel.LocalBalance) / float64(channel.Capacity) * 100 | ||
|
|
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| return lf.findFee(liquidity) | ||
| } | ||
|
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| // PotentialFee for channel based on its current liquidity. | ||
| func (lf LiquidityFees) PotentialFee(channel lightning.Channel, additionalLocal lightning.Satoshi) lightning.FeePPM { | ||
| liquidity := float64(channel.LocalBalance+additionalLocal) / float64(channel.Capacity) * 100 | ||
|
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| return lf.findFee(liquidity) | ||
| } | ||
|
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| func (lf LiquidityFees) findFee(liquidity float64) lightning.FeePPM { | ||
| bucket := 0 | ||
| for bucket < len(lf.thresholds) { | ||
| if liquidity > lf.thresholds[bucket] { | ||
| break | ||
| } else { | ||
| bucket += 1 | ||
| } | ||
|
|
||
| } | ||
|
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| return lf.fees[bucket] | ||
| } | ||
|
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| // RebalanceChannels at the far ends of the spectrum. | ||
| func (lf LiquidityFees) RebalanceChannels(channels lightning.Channels) (high lightning.Channels, low lightning.Channels) { | ||
| for _, c := range channels { | ||
| l := c.Liquidity() | ||
| if l > lf.thresholds[0] { | ||
| high = append(high, c) | ||
| } | ||
|
|
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| if l <= lf.thresholds[len(lf.thresholds)-1] { | ||
| low = append(low, c) | ||
| } | ||
| } | ||
|
|
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| return high, low | ||
| } | ||
|
|
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| func (lf LiquidityFees) RebalanceFee() lightning.FeePPM { | ||
| return lf.fees[len(lf.fees)-1] | ||
| } | ||
|
|
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| // NewLiquidityFees with threshold and fee validation. | ||
| func NewLiquidityFees(thresholds []float64, fees []lightning.FeePPM) (LiquidityFees, error) { | ||
| // ensure every bucket has a fee | ||
| if len(thresholds)+1 != len(fees) { | ||
| return LiquidityFees{}, errors.New("fees must have one more value than thresholds to ensure each bucket has a defined fee") | ||
|
|
||
| } | ||
|
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| // ensure thresholds are descending | ||
| for i := 0; i < len(thresholds)-1; i++ { | ||
| if thresholds[i] <= thresholds[i+1] { | ||
| return LiquidityFees{}, errors.New("thresholds must be descending") | ||
| } | ||
| } | ||
|
|
||
| // ensure fees are ascending | ||
| for i := 0; i < len(fees)-1; i++ { | ||
| if fees[i] > fees[i+1] { | ||
| return LiquidityFees{}, errors.New("fees must be ascending") | ||
| } | ||
| } | ||
|
|
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| return LiquidityFees{ | ||
| thresholds: thresholds, | ||
| fees: fees, | ||
| }, nil | ||
| } |
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