-
Notifications
You must be signed in to change notification settings - Fork 19
/
minter.go
82 lines (69 loc) · 2.61 KB
/
minter.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
package types
import (
"fmt"
"cosmossdk.io/math"
sdk "github.com/cosmos/cosmos-sdk/types"
)
// NewMinter returns a new Minter object with the given inflation and annual
// provisions values.
func NewMinter(inflation, annualProvisions sdk.Dec) Minter {
return Minter{
Inflation: inflation,
AnnualProvisions: annualProvisions,
}
}
// InitialMinter returns an initial Minter object with a given inflation value.
func InitialMinter(inflation sdk.Dec) Minter {
return NewMinter(
inflation,
math.LegacyNewDec(0),
)
}
// DefaultInitialMinter returns a default initial Minter object for a new chain
// which uses an inflation rate of 13%.
func DefaultInitialMinter() Minter {
return InitialMinter(
sdk.NewDecWithPrec(13, 2),
)
}
// ValidateMinter does a basic validation on minter.
func ValidateMinter(minter Minter) error {
if minter.Inflation.IsNegative() {
return fmt.Errorf("mint parameter Inflation should be positive, is %s",
minter.Inflation.String())
}
return nil
}
// NextInflationRate returns the new inflation rate for the next hour.
func (m Minter) NextInflationRate(params Params, bondedRatio sdk.Dec) math.LegacyDec {
// The target annual inflation rate is recalculated for each previsions cycle. The
// inflation is also subject to a rate change (positive or negative) depending on
// the distance from the desired ratio (67%). The maximum rate change possible is
// defined to be 13% per year, however the annual inflation is capped as between
// 7% and 20%.
// (1 - bondedRatio/GoalBonded) * InflationRateChange
inflationRateChangePerYear := math.LegacyOneDec().
Sub(bondedRatio.Quo(params.GoalBonded)).
Mul(params.InflationRateChange)
inflationRateChange := inflationRateChangePerYear.Quo(math.LegacyNewDec(int64(params.BlocksPerYear)))
// adjust the new annual inflation for this next cycle
inflation := m.Inflation.Add(inflationRateChange) // note inflationRateChange may be negative
if inflation.GT(params.InflationMax) {
inflation = params.InflationMax
}
if inflation.LT(params.InflationMin) {
inflation = params.InflationMin
}
return inflation
}
// NextAnnualProvisions returns the annual provisions based on current total
// supply and inflation rate.
func (m Minter) NextAnnualProvisions(_ Params, totalSupply math.Int) math.LegacyDec {
return m.Inflation.MulInt(totalSupply)
}
// BlockProvision returns the provisions for a block based on the annual
// provisions rate.
func (m Minter) BlockProvision(params Params) sdk.Coin {
provisionAmt := m.AnnualProvisions.QuoInt(sdk.NewInt(int64(params.BlocksPerYear)))
return sdk.NewCoin(params.MintDenom, provisionAmt.TruncateInt())
}