// acceptTransactionSet verifies that a transaction set is allowed to be in the
// transaction pool, and then adds it to the transaction pool.
func (tp *TransactionPool) acceptTransactionSet(ts []types.Transaction) error {
if len(ts) == 0 {
return errEmptySet
}
// Remove all transactions that have been confirmed in the transaction set.
err := tp.db.Update(func(tx *bolt.Tx) error {
oldTS := ts
ts = []types.Transaction{}
for _, txn := range oldTS {
if !tp.transactionConfirmed(tx, txn.ID()) {
ts = append(ts, txn)
}
}
return nil
})
if err != nil {
return err
}
// If no transactions remain, return a dublicate error.
if len(ts) == 0 {
return modules.ErrDuplicateTransactionSet
}
// Check the composition of the transaction set, including fees and
// IsStandard rules.
err = tp.checkTransactionSetComposition(ts)
if err != nil {
return err
}
// Check for conflicts with other transactions, which would indicate a
// double-spend. Legal children of a transaction set will also trigger the
// conflict-detector.
oids := relatedObjectIDs(ts)
var conflicts []TransactionSetID
for _, oid := range oids {
conflict, exists := tp.knownObjects[oid]
if exists {
conflicts = append(conflicts, conflict)
}
}
if len(conflicts) > 0 {
return tp.handleConflicts(ts, conflicts)
}
cc, err := tp.consensusSet.TryTransactionSet(ts)
if err != nil {
return modules.NewConsensusConflict(err.Error())
}
// Add the transaction set to the pool.
setID := TransactionSetID(crypto.HashObject(ts))
tp.transactionSets[setID] = ts
for _, oid := range oids {
tp.knownObjects[oid] = setID
}
tp.transactionSetDiffs[setID] = cc
tp.transactionListSize += len(encoding.Marshal(ts))
return nil
}
// acceptTransactionSet verifies that a transaction set is allowed to be in the
// transaction pool, and then adds it to the transaction pool.
func (tp *TransactionPool) acceptTransactionSet(ts []types.Transaction) error {
if len(ts) == 0 {
return errEmptySet
}
// Check the composition of the transaction set, including fees and
// IsStandard rules.
err := tp.checkTransactionSetComposition(ts)
if err != nil {
return err
}
// Check for conflicts with other transactions, which would indicate a
// double-spend. Legal children of a transaction set will also trigger the
// conflict-detector.
oids := relatedObjectIDs(ts)
var conflicts []TransactionSetID
for _, oid := range oids {
conflict, exists := tp.knownObjects[oid]
if exists {
conflicts = append(conflicts, conflict)
}
}
if len(conflicts) > 0 {
return tp.handleConflicts(ts, conflicts)
}
cc, err := tp.consensusSet.TryTransactionSet(ts)
if err != nil {
return modules.NewConsensusConflict(err.Error())
}
// Add the transaction set to the pool.
setID := TransactionSetID(crypto.HashObject(ts))
tp.transactionSets[setID] = ts
for _, oid := range oids {
tp.knownObjects[oid] = setID
}
tp.transactionSetDiffs[setID] = cc
tp.transactionListSize += len(encoding.Marshal(ts))
return nil
}
// handleConflicts detects whether the conflicts in the transaction pool are
// legal children of the new transaction pool set or not.
func (tp *TransactionPool) handleConflicts(ts []types.Transaction, conflicts []TransactionSetID) error {
// Create a list of all the transaction ids that compose the set of
// conflicts.
conflictMap := make(map[types.TransactionID]TransactionSetID)
for _, conflict := range conflicts {
conflictSet := tp.transactionSets[conflict]
for _, conflictTxn := range conflictSet {
conflictMap[conflictTxn.ID()] = conflict
}
}
// Discard all duplicate transactions from the input transaction set.
var dedupSet []types.Transaction
for _, t := range ts {
_, exists := conflictMap[t.ID()]
if exists {
continue
}
dedupSet = append(dedupSet, t)
}
if len(dedupSet) == 0 {
return modules.ErrDuplicateTransactionSet
}
// If transactions were pruned, it's possible that the set of
// dependencies/conflicts has also reduced. To minimize computational load
// on the consensus set, we want to prune out all of the conflicts that are
// no longer relevant. As an example, consider the transaction set {A}, the
// set {B}, and the new set {A, C}, where C is dependent on B. {A} and {B}
// are both conflicts, but after deduplication {A} is no longer a conflict.
// This is recursive, but it is guaranteed to run only once as the first
// deduplication is guaranteed to be complete.
if len(dedupSet) < len(ts) {
oids := relatedObjectIDs(dedupSet)
var conflicts []TransactionSetID
for _, oid := range oids {
conflict, exists := tp.knownObjects[oid]
if exists {
conflicts = append(conflicts, conflict)
}
}
return tp.handleConflicts(dedupSet, conflicts)
}
// Merge all of the conflict sets with the input set (input set goes last
// to preserve dependency ordering), and see if the set as a whole is both
// small enough to be legal and valid as a set. If no, return an error. If
// yes, add the new set to the pool, and eliminate the old set. The output
// diff objects can be repeated, (no need to remove those). Just need to
// remove the conflicts from tp.transactionSets.
var superset []types.Transaction
supersetMap := make(map[TransactionSetID]struct{})
for _, conflict := range conflictMap {
supersetMap[conflict] = struct{}{}
}
for conflict := range supersetMap {
superset = append(superset, tp.transactionSets[conflict]...)
}
superset = append(superset, dedupSet...)
// Check the composition of the transaction set, including fees and
// IsStandard rules (this is a new set, the rules must be rechecked).
err := tp.checkTransactionSetComposition(superset)
if err != nil {
return err
}
// Check that the transaction set is valid.
cc, err := tp.consensusSet.TryTransactionSet(superset)
if err != nil {
return modules.NewConsensusConflict(err.Error())
}
// Remove the conflicts from the transaction pool. The diffs do not need to
// be removed, they will be overwritten later in the function.
for _, conflict := range conflictMap {
conflictSet := tp.transactionSets[conflict]
tp.transactionListSize -= len(encoding.Marshal(conflictSet))
delete(tp.transactionSets, conflict)
delete(tp.transactionSetDiffs, conflict)
}
// Add the transaction set to the pool.
setID := TransactionSetID(crypto.HashObject(superset))
tp.transactionSets[setID] = superset
for _, diff := range cc.SiacoinOutputDiffs {
tp.knownObjects[ObjectID(diff.ID)] = setID
}
for _, diff := range cc.FileContractDiffs {
tp.knownObjects[ObjectID(diff.ID)] = setID
}
for _, diff := range cc.SiafundOutputDiffs {
tp.knownObjects[ObjectID(diff.ID)] = setID
}
tp.transactionSetDiffs[setID] = cc
tp.transactionListSize += len(encoding.Marshal(superset))
return nil
}