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transaction_vertex.go
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transaction_vertex.go
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// Copyright (C) 2019-2021, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package avalanche
import (
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/snow/choices"
"github.com/ava-labs/avalanchego/snow/consensus/snowstorm"
)
var _ snowstorm.Tx = &transactionVertex{}
// newTransactionVertex returns a new transactionVertex initialized with a
// processing status.
func newTransactionVertex(vtx Vertex, nodes map[ids.ID]*transactionVertex) *transactionVertex {
return &transactionVertex{
vtx: vtx,
nodes: nodes,
status: choices.Processing,
}
}
type transactionVertex struct {
// vtx is the vertex that this transaction is attempting to confirm.
vtx Vertex
// nodes is used to look up other transaction vertices that are currently
// processing. This is used to get parent vertices of this transaction.
nodes map[ids.ID]*transactionVertex
// status reports the status of this transaction vertex in snowstorm which
// is then used by avalanche to determine the accaptability of the vertex.
status choices.Status
}
func (tv *transactionVertex) Bytes() []byte {
// Snowstorm uses the bytes of the transaction to broadcast through the
// decision dispatcher. Because this is an internal transaction type, we
// don't want to have this transaction broadcast. So, we return nil here.
return nil
}
func (tv *transactionVertex) ID() ids.ID {
return tv.vtx.ID()
}
func (tv *transactionVertex) Accept() error {
tv.status = choices.Accepted
return nil
}
func (tv *transactionVertex) Reject() error {
tv.status = choices.Rejected
return nil
}
func (tv *transactionVertex) Status() choices.Status { return tv.status }
// Verify isn't called in the consensus code. So this implementation doesn't
// really matter. However it's used to implement the tx interface.
func (tv *transactionVertex) Verify() error { return nil }
// Dependencies returns the currently processing transaction vertices of this
// vertex's parents.
func (tv *transactionVertex) Dependencies() ([]snowstorm.Tx, error) {
parents, err := tv.vtx.Parents()
if err != nil {
return nil, err
}
txs := make([]snowstorm.Tx, 0, len(parents))
for _, parent := range parents {
if parentTx, ok := tv.nodes[parent.ID()]; ok {
txs = append(txs, parentTx)
}
}
return txs, nil
}
// InputIDs must return a non-empty slice to avoid having the snowstorm engine
// vaciously accept it. A slice is returned containing just the vertexID in
// order to produce no conflicts based on the consumed input.
func (tv *transactionVertex) InputIDs() []ids.ID { return []ids.ID{tv.vtx.ID()} }
func (tv *transactionVertex) HasWhitelist() bool { return tv.vtx.HasWhitelist() }
func (tv *transactionVertex) Whitelist() (ids.Set, error) { return tv.vtx.Whitelist() }