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state_sync_mode.go
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state_sync_mode.go
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// Copyright (C) 2019-2023, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package block
// StateSyncMode is returned by the StateSyncableVM when a state summary is
// passed to it. It indicates which type of state sync the VM is performing.
type StateSyncMode uint8
const (
// StateSyncSkipped indicates that state sync won't be run by the VM. This
// may happen if the VM decides that the state sync is too recent and it
// would be faster to bootstrap the missing blocks.
StateSyncSkipped StateSyncMode = iota + 1
// StateSyncStatic indicates that engine should stop and wait for the VM to
// complete state syncing before moving ahead with bootstrapping.
StateSyncStatic
// StateSyncDynamic indicates that engine should immediately transition
// into bootstrapping and then normal consensus. State sync will proceed
// asynchronously in the VM.
//
// Invariant: If this is returned it is assumed that the VM should be able
// to handle requests from the engine as if the VM is fully synced.
// Specifically, it is required that the invariants specified by
// LastAccepted, GetBlock, ParseBlock, and Block.Verify are maintained. This
// means that when StateSummary.Accept returns, the block that would become
// the last accepted block must be immediately fetchable by the engine.
StateSyncDynamic
)
func (s StateSyncMode) String() string {
switch s {
case StateSyncSkipped:
return "Skipped"
case StateSyncStatic:
return "Static"
case StateSyncDynamic:
return "Dynamic"
default:
return "Unknown"
}
}