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atomic_block.go
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atomic_block.go
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// Copyright (C) 2019-2021, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package platformvm
import (
"errors"
"fmt"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/snow/choices"
"github.com/ava-labs/avalanchego/vms/platformvm/status"
)
var (
errConflictingParentTxs = errors.New("block contains a transaction that conflicts with a transaction in a parent block")
_ Block = &AtomicBlock{}
_ decision = &AtomicBlock{}
)
// AtomicBlock being accepted results in the atomic transaction contained in the
// block to be accepted and committed to the chain.
type AtomicBlock struct {
CommonDecisionBlock `serialize:"true"`
Tx Tx `serialize:"true" json:"tx"`
// inputs are the atomic inputs that are consumed by this block's atomic
// transaction
inputs ids.Set
}
func (ab *AtomicBlock) initialize(vm *VM, bytes []byte, status choices.Status, self Block) error {
if err := ab.CommonDecisionBlock.initialize(vm, bytes, status, self); err != nil {
return fmt.Errorf("failed to initialize: %w", err)
}
unsignedBytes, err := Codec.Marshal(CodecVersion, &ab.Tx.UnsignedTx)
if err != nil {
return fmt.Errorf("failed to marshal unsigned tx: %w", err)
}
signedBytes, err := Codec.Marshal(CodecVersion, &ab.Tx)
if err != nil {
return fmt.Errorf("failed to marshal tx: %w", err)
}
ab.Tx.Initialize(unsignedBytes, signedBytes)
ab.Tx.InitCtx(vm.ctx)
return nil
}
// conflicts checks to see if the provided input set contains any conflicts with
// any of this block's non-accepted ancestors or itself.
func (ab *AtomicBlock) conflicts(s ids.Set) (bool, error) {
if ab.Status() == choices.Accepted {
return false, nil
}
if ab.inputs.Overlaps(s) {
return true, nil
}
parent, err := ab.parentBlock()
if err != nil {
return false, err
}
return parent.conflicts(s)
}
// Verify this block performs a valid state transition.
//
// The parent block must be a decision block
//
// This function also sets onAcceptDB database if the verification passes.
func (ab *AtomicBlock) Verify() error {
blkID := ab.ID()
if err := ab.CommonDecisionBlock.Verify(); err != nil {
return err
}
tx, ok := ab.Tx.UnsignedTx.(UnsignedAtomicTx)
if !ok {
return errWrongTxType
}
ab.inputs = tx.InputUTXOs()
parentIntf, err := ab.parentBlock()
if err != nil {
return err
}
conflicts, err := parentIntf.conflicts(ab.inputs)
if err != nil {
return err
}
if conflicts {
return errConflictingParentTxs
}
// AtomicBlock is not a modifier on a proposal block, so its parent must be
// a decision.
parent, ok := parentIntf.(decision)
if !ok {
return errInvalidBlockType
}
parentState := parent.onAccept()
currentTimestamp := parentState.GetTimestamp()
enabledAP5 := !currentTimestamp.Before(ab.vm.ApricotPhase5Time)
if enabledAP5 {
return fmt.Errorf(
"the chain timestamp (%d) is after the apricot phase 5 time (%d), hence atomic transactions should go through the standard block",
currentTimestamp.Unix(),
ab.vm.ApricotPhase5Time.Unix(),
)
}
onAccept, err := tx.AtomicExecute(ab.vm, parentState, &ab.Tx)
if err != nil {
txID := tx.ID()
ab.vm.blockBuilder.MarkDropped(txID, err.Error()) // cache tx as dropped
return fmt.Errorf("tx %s failed semantic verification: %w", txID, err)
}
onAccept.AddTx(&ab.Tx, status.Committed)
ab.onAcceptState = onAccept
ab.timestamp = onAccept.GetTimestamp()
ab.vm.blockBuilder.RemoveDecisionTxs([]*Tx{&ab.Tx})
ab.vm.currentBlocks[blkID] = ab
parentIntf.addChild(ab)
return nil
}
func (ab *AtomicBlock) Accept() error {
blkID := ab.ID()
ab.vm.ctx.Log.Verbo(
"Accepting Atomic Block %s at height %d with parent %s",
blkID,
ab.Height(),
ab.Parent(),
)
if err := ab.CommonBlock.Accept(); err != nil {
return fmt.Errorf("failed to accept CommonBlock of %s: %w", blkID, err)
}
tx, ok := ab.Tx.UnsignedTx.(UnsignedAtomicTx)
if !ok {
return errWrongTxType
}
// Update the state of the chain in the database
ab.onAcceptState.Apply(ab.vm.internalState)
defer ab.vm.internalState.Abort()
batch, err := ab.vm.internalState.CommitBatch()
if err != nil {
return fmt.Errorf(
"failed to commit VM's database for block %s: %w",
blkID,
err,
)
}
if err := tx.AtomicAccept(ab.vm.ctx, batch); err != nil {
return fmt.Errorf(
"failed to atomically accept tx %s in block %s: %w",
tx.ID(),
blkID,
err,
)
}
for _, child := range ab.children {
child.setBaseState()
}
if ab.onAcceptFunc != nil {
if err := ab.onAcceptFunc(); err != nil {
return fmt.Errorf(
"failed to execute onAcceptFunc of %s: %w",
blkID,
err,
)
}
}
ab.free()
return nil
}
func (ab *AtomicBlock) Reject() error {
ab.vm.ctx.Log.Verbo(
"Rejecting Atomic Block %s at height %d with parent %s",
ab.ID(),
ab.Height(),
ab.Parent(),
)
if err := ab.vm.blockBuilder.AddVerifiedTx(&ab.Tx); err != nil {
ab.vm.ctx.Log.Debug(
"failed to reissue tx %q due to: %s",
ab.Tx.ID(),
err,
)
}
return ab.CommonDecisionBlock.Reject()
}
// newAtomicBlock returns a new *AtomicBlock where the block's parent, a
// decision block, has ID [parentID].
func (vm *VM) newAtomicBlock(parentID ids.ID, height uint64, tx Tx) (*AtomicBlock, error) {
ab := &AtomicBlock{
CommonDecisionBlock: CommonDecisionBlock{
CommonBlock: CommonBlock{
PrntID: parentID,
Hght: height,
},
},
Tx: tx,
}
// We serialize this block as a Block so that it can be deserialized into a
// Block
blk := Block(ab)
bytes, err := Codec.Marshal(CodecVersion, &blk)
if err != nil {
return nil, fmt.Errorf("failed to marshal block: %w", err)
}
return ab, ab.initialize(vm, bytes, choices.Processing, ab)
}