// NewPendingTransaction creates a subscription that is triggered each time a transaction enters the transaction pool
// and is send from one of the transactions this nodes manages.
func (s *PublicTransactionPoolAPI) NewPendingTransactions() (rpc.Subscription, error) {
sub := s.eventMux.Subscribe(core.TxPreEvent{})
accounts, err := s.am.Accounts()
if err != nil {
return rpc.Subscription{}, err
}
accountSet := set.New()
for _, account := range accounts {
accountSet.Add(account.Address)
}
accountSetLastUpdates := time.Now()
output := func(transaction interface{}) interface{} {
if time.Since(accountSetLastUpdates) > (time.Duration(2) * time.Second) {
if accounts, err = s.am.Accounts(); err != nil {
accountSet.Clear()
for _, account := range accounts {
accountSet.Add(account.Address)
}
accountSetLastUpdates = time.Now()
}
}
tx := transaction.(core.TxPreEvent)
if from, err := tx.Tx.From(); err == nil {
if accountSet.Has(from) {
return tx.Tx.Hash()
}
}
return nil
}
return rpc.NewSubscriptionWithOutputFormat(sub, output), nil
}
// NewBlocks triggers a new block event each time a block is appended to the chain. It accepts an argument which allows
// the caller to specify whether the output should contain transactions and in what format.
func (s *PublicBlockChainAPI) NewBlocks(args NewBlocksArgs) (rpc.Subscription, error) {
sub := s.eventMux.Subscribe(core.ChainEvent{})
output := func(rawBlock interface{}) interface{} {
if event, ok := rawBlock.(core.ChainEvent); ok {
notification, err := s.rpcOutputBlock(event.Block, args.IncludeTransactions, args.TransactionDetails)
if err == nil {
return notification
}
}
return rawBlock
}
return rpc.NewSubscriptionWithOutputFormat(sub, output), nil
}
// Syncing provides information when this nodes starts synchronising with the Ethereumn network and when it's finished.
func (s *PublicDownloaderAPI) Syncing() (rpc.Subscription, error) {
sub := s.d.mux.Subscribe(StartEvent{}, DoneEvent{}, FailedEvent{})
output := func(event interface{}) interface{} {
switch event.(type) {
case StartEvent:
result := &SyncingResult{Syncing: true}
result.Status.Origin, result.Status.Current, result.Status.Height = s.d.Progress()
return result
case DoneEvent, FailedEvent:
return false
}
return nil
}
return rpc.NewSubscriptionWithOutputFormat(sub, output), nil
}