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50 lines
1.7 KiB
Markdown
50 lines
1.7 KiB
Markdown
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<!--
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order: 6
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-->
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# Begin Block
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At the start of each block, new KAVA tokens are minted and distributed
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```go
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// BeginBlocker mints & distributes new tokens for the previous block.
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func BeginBlocker(ctx sdk.Context, k Keeper) {
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params := k.GetParams(ctx)
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// fetch the last block time from state
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previousBlockTime := k.GetPreviousBlockTime(ctx)
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secondsPassed := ctx.BlockTime().Sub(previousBlockTime).Seconds()
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// determine totals before any new mints
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totalSupply := k.TotalSupply(ctx)
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totalBonded := k.TotalBondedTokens(ctx)
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// ------------- Staking Rewards -------------
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// determine amount of the bond denom to mint for staking rewards
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stakingRewardCoins, err := k.AccumulateInflation(
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ctx, params.StakingRewardsApy, totalBonded, secondsPassed,
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)
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// mint the staking rewards
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k.MintCoins(ctx, stakingRewardCoins)
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// distribute them to the fee pool for distribution by x/distribution
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k.AddCollectedFees(ctx, stakingRewardCoins)
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// ------------- Community Pool -------------
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// determine amount of the bond denom to mint for community pool inflation
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communityPoolInflation, err := k.AccumulateInflation(
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ctx, params.CommunityPoolInflation, totalSupply, secondsPassed,
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)
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// mint the community pool tokens
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k.MintCoins(ctx, communityPoolCoins)
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// send them to the community module account (the community pool)
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k.AddCommunityPoolFunds(ctx, communityPoolCoins)
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// ------------- Bookkeeping -------------
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// set block time for next iteration's minting
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k.SetPreviousBlockTime(ctx, ctx.BlockTime())
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}
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```
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`AccumulateInflation` determines the effective rate of the yearly interest rate assuming it is
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compounded once per second, for the number of seconds since the previous mint. See concepts for
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more details.
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