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hooks.go
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hooks.go
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package keeper
import (
"fmt"
sdk "github.com/cosmos/cosmos-sdk/types"
epochstypes "github.com/echelonfoundation/echelon/v3/x/epochs/types"
"github.com/echelonfoundation/echelon/v3/x/inflation/types"
)
// BeforeEpochStart: noop, We don't need to do anything here
func (k Keeper) BeforeEpochStart(_ sdk.Context, _ string, _ int64) {
}
// AfterEpochEnd mints and distributes coins at the end of each epoch end
func (k Keeper) AfterEpochEnd(ctx sdk.Context, epochIdentifier string, epochNumber int64) {
params := k.GetParams(ctx)
skippedEpochs := k.GetSkippedEpochs(ctx)
// Skip inflation if it is disabled and increment number of skipped epochs
if !params.EnableInflation {
skippedEpochs++
k.SetSkippedEpochs(ctx, skippedEpochs)
k.Logger(ctx).Debug(
"skipping inflation mint and distribution",
"height", ctx.BlockHeight(),
"epoch-id", epochIdentifier,
"epoch-number", epochNumber,
"skipped-epochs", skippedEpochs,
)
return
}
expEpochID := k.GetEpochIdentifier(ctx)
if epochIdentifier != expEpochID {
return
}
// mint coins, update supply
epochMintProvision, found := k.GetEpochMintProvision(ctx)
if !found {
panic("the epochMintProvision was not found")
}
mintedCoin := sdk.NewCoin(params.MintDenom, epochMintProvision.TruncateInt())
if err := k.MintAndAllocateInflation(ctx, mintedCoin); err != nil {
panic(err)
}
period := k.GetPeriod(ctx)
epochsPerPeriod := k.GetEpochsPerPeriod(ctx)
newProvision := epochMintProvision
// If period is passed, update the period and epochMintProvision. A period is
// passed if the current epoch number surpasses the epochsPerPeriod for the
// current period. Skipped epochs are subtracted to only account for epochs
// where inflation minted tokens.
//
// Examples:
// Given, epochNumber = 1, period = 0, epochPerPeriod = 365, skippedEpochs = 0
// => 1 - 365 * 0 - 0 < 365 --- nothing to do here
// Given, epochNumber = 741, period = 1, epochPerPeriod = 365, skippedEpochs = 10
// => 741 - 1 * 365 - 10 > 365 --- a period has passed! we change the epochMintProvision and set a new period
if epochNumber-epochsPerPeriod*int64(period)-int64(skippedEpochs) > epochsPerPeriod {
period++
k.SetPeriod(ctx, period)
period = k.GetPeriod(ctx)
bondedRatio := k.BondedRatio(ctx)
newProvision = types.CalculateEpochMintProvision(
params,
period,
epochsPerPeriod,
bondedRatio,
)
k.SetEpochMintProvision(ctx, newProvision)
}
ctx.EventManager().EmitEvent(
sdk.NewEvent(
types.EventTypeMint,
sdk.NewAttribute(types.AttributeEpochNumber, fmt.Sprintf("%d", epochNumber)),
sdk.NewAttribute(types.AttributeKeyEpochProvisions, newProvision.String()),
sdk.NewAttribute(sdk.AttributeKeyAmount, mintedCoin.Amount.String()),
),
)
}
// ___________________________________________________________________________________________________
// Hooks wrapper struct for incentives keeper
type Hooks struct {
k Keeper
}
var _ epochstypes.EpochHooks = Hooks{}
// Return the wrapper struct
func (k Keeper) Hooks() Hooks {
return Hooks{k}
}
// epochs hooks
func (h Hooks) BeforeEpochStart(ctx sdk.Context, epochIdentifier string, epochNumber int64) {
h.k.BeforeEpochStart(ctx, epochIdentifier, epochNumber)
}
func (h Hooks) AfterEpochEnd(ctx sdk.Context, epochIdentifier string, epochNumber int64) {
h.k.AfterEpochEnd(ctx, epochIdentifier, epochNumber)
}