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peerAuthenticationSender.go
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peerAuthenticationSender.go
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package sender
import (
"bytes"
"fmt"
"time"
"github.com/ElrondNetwork/elrond-go-core/core/check"
"github.com/ElrondNetwork/elrond-go-core/data/batch"
crypto "github.com/ElrondNetwork/elrond-go-crypto"
"github.com/ElrondNetwork/elrond-go/heartbeat"
)
// argPeerAuthenticationSender represents the arguments for the peer authentication sender
type argPeerAuthenticationSender struct {
argBaseSender
nodesCoordinator heartbeat.NodesCoordinator
peerSignatureHandler crypto.PeerSignatureHandler
hardforkTrigger heartbeat.HardforkTrigger
hardforkTimeBetweenSends time.Duration
hardforkTriggerPubKey []byte
}
type peerAuthenticationSender struct {
baseSender
nodesCoordinator heartbeat.NodesCoordinator
peerSignatureHandler crypto.PeerSignatureHandler
hardforkTrigger heartbeat.HardforkTrigger
hardforkTimeBetweenSends time.Duration
hardforkTriggerPubKey []byte
}
// newPeerAuthenticationSender will create a new instance of type peerAuthenticationSender
func newPeerAuthenticationSender(args argPeerAuthenticationSender) (*peerAuthenticationSender, error) {
err := checkPeerAuthenticationSenderArgs(args)
if err != nil {
return nil, err
}
senderInstance := &peerAuthenticationSender{
baseSender: createBaseSender(args.argBaseSender),
nodesCoordinator: args.nodesCoordinator,
peerSignatureHandler: args.peerSignatureHandler,
hardforkTrigger: args.hardforkTrigger,
hardforkTimeBetweenSends: args.hardforkTimeBetweenSends,
hardforkTriggerPubKey: args.hardforkTriggerPubKey,
}
return senderInstance, nil
}
func checkPeerAuthenticationSenderArgs(args argPeerAuthenticationSender) error {
err := checkBaseSenderArgs(args.argBaseSender)
if err != nil {
return err
}
if check.IfNil(args.nodesCoordinator) {
return heartbeat.ErrNilNodesCoordinator
}
if check.IfNil(args.peerSignatureHandler) {
return heartbeat.ErrNilPeerSignatureHandler
}
if check.IfNil(args.hardforkTrigger) {
return heartbeat.ErrNilHardforkTrigger
}
if args.hardforkTimeBetweenSends < minTimeBetweenSends {
return fmt.Errorf("%w for hardforkTimeBetweenSends", heartbeat.ErrInvalidTimeDuration)
}
if len(args.hardforkTriggerPubKey) == 0 {
return fmt.Errorf("%w hardfork trigger public key bytes length is 0", heartbeat.ErrInvalidValue)
}
return nil
}
// Execute will handle the execution of a cycle in which the peer authentication message will be sent
func (sender *peerAuthenticationSender) Execute() {
var duration time.Duration
defer func() {
sender.CreateNewTimer(duration)
}()
_, pk := sender.getCurrentPrivateAndPublicKeys()
pkBytes, err := pk.ToByteArray()
if err != nil {
duration = sender.timeBetweenSendsWhenError
return
}
if !sender.isValidator(pkBytes) && !sender.isHardforkSource(pkBytes) {
duration = sender.timeBetweenSendsWhenError
return
}
duration = sender.computeRandomDuration(sender.timeBetweenSends)
err, isHardforkTriggered := sender.execute()
if err != nil {
duration = sender.timeBetweenSendsWhenError
log.Error("error sending peer authentication message", "error", err, "is hardfork triggered", isHardforkTriggered, "next send will be in", duration)
return
}
if isHardforkTriggered {
duration = sender.computeRandomDuration(sender.hardforkTimeBetweenSends)
}
log.Debug("peer authentication message sent", "is hardfork triggered", isHardforkTriggered, "next send will be in", duration)
}
func (sender *peerAuthenticationSender) execute() (error, bool) {
sk, pk := sender.getCurrentPrivateAndPublicKeys()
msg := &heartbeat.PeerAuthentication{
Pid: sender.messenger.ID().Bytes(),
}
hardforkPayload, isTriggered := sender.getHardforkPayload()
payload := &heartbeat.Payload{
Timestamp: time.Now().Unix(),
HardforkMessage: string(hardforkPayload),
}
payloadBytes, err := sender.marshaller.Marshal(payload)
if err != nil {
return err, isTriggered
}
msg.Payload = payloadBytes
msg.PayloadSignature, err = sender.messenger.Sign(payloadBytes)
if err != nil {
return err, isTriggered
}
msg.Pubkey, err = pk.ToByteArray()
if err != nil {
return err, isTriggered
}
msg.Signature, err = sender.peerSignatureHandler.GetPeerSignature(sk, msg.Pid)
if err != nil {
return err, isTriggered
}
msgBytes, err := sender.marshaller.Marshal(msg)
if err != nil {
return err, isTriggered
}
b := &batch.Batch{
Data: make([][]byte, 1),
}
b.Data[0] = msgBytes
data, err := sender.marshaller.Marshal(b)
if err != nil {
return err, isTriggered
}
log.Debug("sending peer authentication message",
"public key", msg.Pubkey, "pid", sender.messenger.ID().Pretty(),
"timestamp", payload.Timestamp)
sender.messenger.Broadcast(sender.topic, data)
return nil, isTriggered
}
// ShouldTriggerHardfork signals when hardfork message should be sent
func (sender *peerAuthenticationSender) ShouldTriggerHardfork() <-chan struct{} {
return sender.hardforkTrigger.NotifyTriggerReceivedV2()
}
func (sender *peerAuthenticationSender) isValidator(pkBytes []byte) bool {
_, _, err := sender.nodesCoordinator.GetValidatorWithPublicKey(pkBytes)
return err == nil
}
func (sender *peerAuthenticationSender) isHardforkSource(pkBytes []byte) bool {
return bytes.Equal(pkBytes, sender.hardforkTriggerPubKey)
}
func (sender *peerAuthenticationSender) getHardforkPayload() ([]byte, bool) {
payload := make([]byte, 0)
_, isTriggered := sender.hardforkTrigger.RecordedTriggerMessage()
if isTriggered {
payload = sender.hardforkTrigger.CreateData()
}
return payload, isTriggered
}
// IsInterfaceNil returns true if there is no value under the interface
func (sender *peerAuthenticationSender) IsInterfaceNil() bool {
return sender == nil
}