mirror of https://github.com/poanetwork/gecko.git
109 lines
2.7 KiB
Go
109 lines
2.7 KiB
Go
// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
|
|
// See the file LICENSE for licensing terms.
|
|
|
|
package platformvm
|
|
|
|
import (
|
|
"github.com/ava-labs/gecko/database"
|
|
"github.com/ava-labs/gecko/database/versiondb"
|
|
"github.com/ava-labs/gecko/ids"
|
|
"github.com/ava-labs/gecko/vms/components/core"
|
|
)
|
|
|
|
// DecisionTx is an operation that can be decided without being proposed
|
|
type DecisionTx interface {
|
|
initialize(vm *VM) error
|
|
|
|
// Attempt to verify this transaction with the provided state. The provided
|
|
// database can be modified arbitrarily. If a nil error is returned, it is
|
|
// assumped onAccept is non-nil.
|
|
SemanticVerify(database.Database) (onAccept func(), err error)
|
|
}
|
|
|
|
// StandardBlock being accepted results in the transactions contained in the
|
|
// block to be accepted and committed to the chain.
|
|
type StandardBlock struct {
|
|
CommonDecisionBlock `serialize:"true"`
|
|
|
|
Txs []DecisionTx `serialize:"true"`
|
|
}
|
|
|
|
// initialize this block
|
|
func (sb *StandardBlock) initialize(vm *VM, bytes []byte) error {
|
|
if err := sb.CommonDecisionBlock.initialize(vm, bytes); err != nil {
|
|
return err
|
|
}
|
|
for _, tx := range sb.Txs {
|
|
if err := tx.initialize(vm); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Verify this block performs a valid state transition.
|
|
//
|
|
// The parent block must be a proposal
|
|
//
|
|
// This function also sets onAcceptDB database if the verification passes.
|
|
func (sb *StandardBlock) Verify() error {
|
|
// StandardBlock is not a modifier on a proposal block, so its parent must
|
|
// be a decision.
|
|
parent, ok := sb.parentBlock().(decision)
|
|
if !ok {
|
|
return errInvalidBlockType
|
|
}
|
|
|
|
pdb := parent.onAccept()
|
|
|
|
sb.onAcceptDB = versiondb.New(pdb)
|
|
funcs := []func(){}
|
|
for _, tx := range sb.Txs {
|
|
onAccept, err := tx.SemanticVerify(sb.onAcceptDB)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if onAccept != nil {
|
|
funcs = append(funcs, onAccept)
|
|
}
|
|
}
|
|
|
|
if numFuncs := len(funcs); numFuncs == 1 {
|
|
sb.onAcceptFunc = funcs[0]
|
|
} else if numFuncs > 1 {
|
|
sb.onAcceptFunc = func() {
|
|
for _, f := range funcs {
|
|
f()
|
|
}
|
|
}
|
|
}
|
|
|
|
sb.vm.currentBlocks[sb.ID().Key()] = sb
|
|
sb.parentBlock().addChild(sb)
|
|
return nil
|
|
}
|
|
|
|
// newStandardBlock returns a new *StandardBlock where the block's parent, a
|
|
// decision block, has ID [parentID].
|
|
func (vm *VM) newStandardBlock(parentID ids.ID, txs []DecisionTx) (*StandardBlock, error) {
|
|
sb := &StandardBlock{
|
|
CommonDecisionBlock: CommonDecisionBlock{
|
|
CommonBlock: CommonBlock{
|
|
Block: core.NewBlock(parentID),
|
|
vm: vm,
|
|
},
|
|
},
|
|
Txs: txs,
|
|
}
|
|
|
|
// We serialize this block as a Block so that it can be deserialized into a
|
|
// Block
|
|
blk := Block(sb)
|
|
bytes, err := Codec.Marshal(&blk)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
sb.Block.Initialize(bytes, vm.SnowmanVM)
|
|
return sb, nil
|
|
}
|