mirror of https://github.com/poanetwork/gecko.git
61 lines
1.6 KiB
Go
61 lines
1.6 KiB
Go
// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
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// See the file LICENSE for licensing terms.
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package platformvm
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import (
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"github.com/ava-labs/gecko/ids"
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"github.com/ava-labs/gecko/vms/components/core"
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)
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// Commit being accepted results in the proposal of its parent (which must be a proposal block)
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// being enacted.
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type Commit struct {
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DoubleDecisionBlock `serialize:"true"`
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}
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// Verify this block performs a valid state transition.
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//
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// The parent block must either be a proposal
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//
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// This function also sets the onCommit databases if the verification passes.
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func (c *Commit) Verify() error {
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// the parent of an Commit block should always be a proposal
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parent, ok := c.parentBlock().(*ProposalBlock)
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if !ok {
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if err := c.Reject(); err == nil {
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if err := c.vm.DB.Commit(); err != nil {
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c.vm.Ctx.Log.Error("error committing Commit block as rejected: %s", err)
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}
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} else {
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c.vm.DB.Abort()
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}
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return errInvalidBlockType
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}
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c.onAcceptDB, c.onAcceptFunc = parent.onCommit()
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c.vm.currentBlocks[c.ID().Key()] = c
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c.parentBlock().addChild(c)
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return nil
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}
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// newCommitBlock returns a new *Commit block where the block's parent, a
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// proposal block, has ID [parentID].
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func (vm *VM) newCommitBlock(parentID ids.ID) *Commit {
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commit := &Commit{DoubleDecisionBlock: DoubleDecisionBlock{CommonDecisionBlock: CommonDecisionBlock{CommonBlock: CommonBlock{
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Block: core.NewBlock(parentID),
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vm: vm,
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}}}}
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// We serialize this block as a Block so that it can be deserialized into a
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// Block
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blk := Block(commit)
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bytes, err := Codec.Marshal(&blk)
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if err != nil {
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return nil
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}
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commit.Block.Initialize(bytes, vm.SnowmanVM)
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return commit
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}
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