func (d *DeliverService) startDeliver(committer committer.Committer) error {
logger.Info("Starting deliver service client")
err := d.initDeliver()
if err != nil {
logger.Errorf("Can't initiate deliver protocol [%s]", err)
return err
}
height, err := committer.LedgerHeight()
if err != nil {
logger.Errorf("Can't get legder height from committer [%s]", err)
return err
}
if height > 0 {
logger.Debugf("Starting deliver with block [%d]", height)
if err := d.seekLatestFromCommitter(height); err != nil {
return err
}
} else {
logger.Debug("Starting deliver with olders block")
if err := d.seekOldest(); err != nil {
return err
}
}
d.readUntilClose()
return nil
}
// NewGossipStateProvider creates initialized instance of gossip state provider
func NewGossipStateProvider(g gossip.Gossip, committer committer.Committer) GossipStateProvider {
logger, _ := logging.GetLogger("GossipStateProvider")
logging.SetLevel(logging.DEBUG, logger.Module)
gossipChan, _ := g.Accept(func(message interface{}) bool {
// Get only data messages
return message.(*proto.GossipMessage).GetDataMsg() != nil
}, false)
// Filter message which are only relevant for state transfer
_, commChan := g.Accept(func(message interface{}) bool {
return message.(comm.ReceivedMessage).GetGossipMessage().GetStateRequest() != nil ||
message.(comm.ReceivedMessage).GetGossipMessage().GetStateResponse() != nil
}, true)
height, err := committer.LedgerHeight()
if err != nil {
logger.Error("Could not read ledger info to obtain current ledger height due to: ", err)
// Exiting as without ledger it will be impossible
// to deliver new blocks
return nil
}
s := &GossipStateProviderImpl{
// Instance of the gossip
gossip: g,
// Channel to read new messages from
gossipChan: gossipChan,
// Channel to read direct messages from other peers
commChan: commChan,
stopFlag: 0,
// Create a queue for payload received
payloads: NewPayloadsBuffer(height + 1),
committer: committer,
logger: logger,
}
logging.SetFormatter(logFormat)
state := NewNodeMetastate(height)
s.logger.Infof("Updating node metadata information, current ledger sequence is at = %d, next expected block is = %d", state.LedgerHeight, s.payloads.Next())
bytes, err := state.Bytes()
if err == nil {
g.UpdateMetadata(bytes)
} else {
s.logger.Errorf("Unable to serialize node meta state, error = %s", err)
}
s.done.Add(3)
// Listen for incoming communication
go s.listen()
// Deliver in order messages into the incoming channel
go s.deliverPayloads()
// Execute anti entropy to fill missing gaps
go s.antiEntropy()
return s
}