mirror of
https://github.com/0glabs/0g-chain.git
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50 lines
1.3 KiB
Markdown
50 lines
1.3 KiB
Markdown
<!--
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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, atomic swaps that meet certain criteria are expired or deleted.
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```go
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func BeginBlocker(ctx sdk.Context, k Keeper) {
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k.UpdateExpiredAtomicSwaps(ctx)
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k.DeleteClosedAtomicSwapsFromLongtermStorage(ctx)
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}
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```
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## Expiration
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If an atomic swap's `ExpireHeight` is greater than the current block height, it will be expired. The logic to expire atomic swaps is as follows:
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```go
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var expiredSwapIDs []string
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k.IterateAtomicSwapsByBlock(ctx, uint64(ctx.BlockHeight()), func(id []byte) bool {
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atomicSwap, found := k.GetAtomicSwap(ctx, id)
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if !found {
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return false
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}
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// Expire the uncompleted swap and update both indexes
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atomicSwap.Status = types.Expired
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k.RemoveFromByBlockIndex(ctx, atomicSwap)
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k.SetAtomicSwap(ctx, atomicSwap)
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expiredSwapIDs = append(expiredSwapIDs, hex.EncodeToString(atomicSwap.GetSwapID()))
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return false
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})
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```
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## Deletion
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Atomic swaps are deleted 86400 blocks (one week, assuming a block time of 7 seconds) after being completed. The logic to delete atomic swaps is as follows:
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```go
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k.IterateAtomicSwapsLongtermStorage(ctx, uint64(ctx.BlockHeight()), func(id []byte) bool {
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swap, found := k.GetAtomicSwap(ctx, id)
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if !found {
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return false
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}
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k.RemoveAtomicSwap(ctx, swap.GetSwapID())
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k.RemoveFromLongtermStorage(ctx, swap)
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return false
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})
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``` |