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sender.go
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sender.go
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package process
import (
"fmt"
"time"
"github.com/ElrondNetwork/elrond-go/core"
"github.com/ElrondNetwork/elrond-go/core/check"
"github.com/ElrondNetwork/elrond-go/crypto"
"github.com/ElrondNetwork/elrond-go/heartbeat"
heartbeatData "github.com/ElrondNetwork/elrond-go/heartbeat/data"
"github.com/ElrondNetwork/elrond-go/marshal"
"github.com/ElrondNetwork/elrond-go/sharding"
)
const delayAfterHardforkMessageBroadcast = time.Second * 5
// ArgHeartbeatSender represents the arguments for the heartbeat sender
type ArgHeartbeatSender struct {
PeerMessenger heartbeat.P2PMessenger
PeerSignatureHandler crypto.PeerSignatureHandler
PrivKey crypto.PrivateKey
Marshalizer marshal.Marshalizer
Topic string
ShardCoordinator sharding.Coordinator
PeerTypeProvider heartbeat.PeerTypeProviderHandler
StatusHandler core.AppStatusHandler
VersionNumber string
NodeDisplayName string
KeyBaseIdentity string
HardforkTrigger heartbeat.HardforkTrigger
CurrentBlockProvider heartbeat.CurrentBlockProvider
RedundancyHandler heartbeat.NodeRedundancyHandler
}
// Sender periodically sends heartbeat messages on a pubsub topic
type Sender struct {
peerMessenger heartbeat.P2PMessenger
peerSignatureHandler crypto.PeerSignatureHandler
privKey crypto.PrivateKey
publicKey crypto.PublicKey
observerPublicKey crypto.PublicKey
marshalizer marshal.Marshalizer
shardCoordinator sharding.Coordinator
peerTypeProvider heartbeat.PeerTypeProviderHandler
statusHandler core.AppStatusHandler
topic string
versionNumber string
nodeDisplayName string
keyBaseIdentity string
hardforkTrigger heartbeat.HardforkTrigger
currentBlockProvider heartbeat.CurrentBlockProvider
redundancy heartbeat.NodeRedundancyHandler
}
// NewSender will create a new sender instance
func NewSender(arg ArgHeartbeatSender) (*Sender, error) {
if check.IfNil(arg.PeerMessenger) {
return nil, heartbeat.ErrNilMessenger
}
if check.IfNil(arg.PeerSignatureHandler) {
return nil, heartbeat.ErrNilPeerSignatureHandler
}
if check.IfNil(arg.PrivKey) {
return nil, fmt.Errorf("%w for arg.PrivKey", heartbeat.ErrNilPrivateKey)
}
if check.IfNil(arg.Marshalizer) {
return nil, heartbeat.ErrNilMarshalizer
}
if check.IfNil(arg.ShardCoordinator) {
return nil, heartbeat.ErrNilShardCoordinator
}
if check.IfNil(arg.PeerTypeProvider) {
return nil, heartbeat.ErrNilPeerTypeProvider
}
if check.IfNil(arg.StatusHandler) {
return nil, heartbeat.ErrNilAppStatusHandler
}
if check.IfNil(arg.HardforkTrigger) {
return nil, heartbeat.ErrNilHardforkTrigger
}
if check.IfNil(arg.CurrentBlockProvider) {
return nil, heartbeat.ErrNilCurrentBlockProvider
}
if check.IfNil(arg.RedundancyHandler) {
return nil, heartbeat.ErrNilRedundancyHandler
}
err := VerifyHeartbeatProperyLen("application version string", []byte(arg.VersionNumber))
if err != nil {
return nil, err
}
observerPrivateKey := arg.RedundancyHandler.ObserverPrivateKey()
if check.IfNil(observerPrivateKey) {
return nil, fmt.Errorf("%w for arg.RedundancyHandler.ObserverPrivateKey()", heartbeat.ErrNilPrivateKey)
}
sender := &Sender{
peerMessenger: arg.PeerMessenger,
peerSignatureHandler: arg.PeerSignatureHandler,
privKey: arg.PrivKey,
publicKey: arg.PrivKey.GeneratePublic(),
observerPublicKey: observerPrivateKey.GeneratePublic(),
marshalizer: arg.Marshalizer,
topic: arg.Topic,
shardCoordinator: arg.ShardCoordinator,
peerTypeProvider: arg.PeerTypeProvider,
statusHandler: arg.StatusHandler,
versionNumber: arg.VersionNumber,
nodeDisplayName: arg.NodeDisplayName,
keyBaseIdentity: arg.KeyBaseIdentity,
hardforkTrigger: arg.HardforkTrigger,
currentBlockProvider: arg.CurrentBlockProvider,
redundancy: arg.RedundancyHandler,
}
return sender, nil
}
// SendHeartbeat broadcasts a new heartbeat message
func (s *Sender) SendHeartbeat() error {
nonce := uint64(0)
crtBlock := s.currentBlockProvider.GetCurrentBlockHeader()
if !check.IfNil(crtBlock) {
nonce = crtBlock.GetNonce()
}
hb := &heartbeatData.Heartbeat{
Payload: []byte(fmt.Sprintf("%v", time.Now())),
ShardID: s.shardCoordinator.SelfId(),
VersionNumber: s.versionNumber,
NodeDisplayName: s.nodeDisplayName,
Identity: s.keyBaseIdentity,
Pid: s.peerMessenger.ID().Bytes(),
Nonce: nonce,
}
triggerMessage, isHardforkTriggered := s.hardforkTrigger.RecordedTriggerMessage()
if isHardforkTriggered {
isPayloadRecorded := len(triggerMessage) != 0
if isPayloadRecorded {
//beside sending the regular heartbeat message, send also the initial payload hardfork trigger message
// so that will be spread in an epidemic manner
log.Debug("broadcasting stored hardfork message")
s.peerMessenger.Broadcast(s.topic, triggerMessage)
time.Sleep(delayAfterHardforkMessageBroadcast)
} else {
hb.Payload = s.hardforkTrigger.CreateData()
}
}
err := s.finalizeMessageConstruction(hb)
if err != nil {
return err
}
log.Debug("broadcasting message heartbeat message",
"is hardfork triggered", isHardforkTriggered,
"hex public key", hb.Pubkey,
)
buffToSend, err := s.marshalizer.Marshal(hb)
if err != nil {
return err
}
s.peerMessenger.Broadcast(s.topic, buffToSend)
return nil
}
func (s *Sender) finalizeMessageConstruction(hb *heartbeatData.Heartbeat) error {
sk, pk := s.getCurrentPrivateAndPublicKeys()
var err error
hb.Pubkey, err = pk.ToByteArray()
if err != nil {
return err
}
s.updateMetrics(hb)
err = verifyLengths(hb)
if err != nil {
log.Warn("verify hb length", "error", err.Error())
trimLengths(hb)
}
hb.Signature, err = s.peerSignatureHandler.GetPeerSignature(sk, hb.Pid)
return err
}
func (s *Sender) getCurrentPrivateAndPublicKeys() (crypto.PrivateKey, crypto.PublicKey) {
shouldUseOriginalKeys := !s.redundancy.IsRedundancyNode() || (s.redundancy.IsRedundancyNode() && !s.redundancy.IsMainMachineActive())
if shouldUseOriginalKeys {
return s.privKey, s.publicKey
}
return s.redundancy.ObserverPrivateKey(), s.observerPublicKey
}
func (s *Sender) updateMetrics(hb *heartbeatData.Heartbeat) {
result := s.computePeerList(hb.Pubkey)
nodeType := ""
if result == string(core.ObserverList) {
nodeType = string(core.NodeTypeObserver)
} else {
nodeType = string(core.NodeTypeValidator)
}
s.statusHandler.SetStringValue(core.MetricNodeType, nodeType)
s.statusHandler.SetStringValue(core.MetricPeerType, result)
}
func (s *Sender) computePeerList(pubkey []byte) string {
peerType, _, err := s.peerTypeProvider.ComputeForPubKey(pubkey)
if err != nil {
log.Warn("sender: compute peer type", "error", err)
return string(core.ObserverList)
}
return string(peerType)
}