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connectionmanager.go
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connectionmanager.go
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package gateway
import (
"context"
"crypto/rand"
"encoding/hex"
"errors"
"fmt"
"strings"
"sync"
"time"
"github.com/gorilla/websocket"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"go.uber.org/multierr"
"github.com/smartcontractkit/chainlink-common/pkg/services"
"github.com/smartcontractkit/chainlink/v2/core/logger"
"github.com/smartcontractkit/chainlink/v2/core/services/gateway/api"
"github.com/smartcontractkit/chainlink/v2/core/services/gateway/common"
"github.com/smartcontractkit/chainlink/v2/core/services/gateway/config"
"github.com/smartcontractkit/chainlink/v2/core/services/gateway/handlers"
"github.com/smartcontractkit/chainlink/v2/core/services/gateway/network"
"github.com/smartcontractkit/chainlink/v2/core/services/job"
"github.com/smartcontractkit/chainlink/v2/core/utils"
)
var promHeartbeatsSent = promauto.NewGaugeVec(prometheus.GaugeOpts{
Name: "gateway_heartbeats_sent",
Help: "Metric to track the number of successful node heartbeates per DON",
}, []string{"don_id"})
// ConnectionManager holds all connections between Gateway and Nodes.
type ConnectionManager interface {
job.ServiceCtx
network.ConnectionAcceptor
DONConnectionManager(donId string) *donConnectionManager
GetPort() int
}
type connectionManager struct {
services.StateMachine
config *config.ConnectionManagerConfig
dons map[string]*donConnectionManager
wsServer network.WebSocketServer
clock utils.Clock
connAttempts map[string]*connAttempt
connAttemptCounter uint64
connAttemptsMu sync.Mutex
lggr logger.Logger
}
func (m *connectionManager) HealthReport() map[string]error {
hr := map[string]error{m.Name(): m.Healthy()}
for _, d := range m.dons {
for _, n := range d.nodes {
services.CopyHealth(hr, n.conn.HealthReport())
}
}
return hr
}
func (m *connectionManager) Name() string { return m.lggr.Name() }
type donConnectionManager struct {
donConfig *config.DONConfig
nodes map[string]*nodeState
handler handlers.Handler
codec api.Codec
closeWait sync.WaitGroup
shutdownCh services.StopChan
lggr logger.Logger
}
type nodeState struct {
conn network.WSConnectionWrapper
}
// immutable
type connAttempt struct {
nodeState *nodeState
nodeAddress string
challenge network.ChallengeElems
timestamp uint32
}
func NewConnectionManager(gwConfig *config.GatewayConfig, clock utils.Clock, lggr logger.Logger) (ConnectionManager, error) {
codec := &api.JsonRPCCodec{}
dons := make(map[string]*donConnectionManager)
for _, donConfig := range gwConfig.Dons {
donConfig := donConfig
if donConfig.DonId == "" {
return nil, errors.New("empty DON ID")
}
_, ok := dons[donConfig.DonId]
if ok {
return nil, fmt.Errorf("duplicate DON ID %s", donConfig.DonId)
}
nodes := make(map[string]*nodeState)
for _, nodeConfig := range donConfig.Members {
nodeAddress := strings.ToLower(nodeConfig.Address)
_, ok := nodes[nodeAddress]
if ok {
return nil, fmt.Errorf("duplicate node address %s in DON %s", nodeAddress, donConfig.DonId)
}
nodes[nodeAddress] = &nodeState{conn: network.NewWSConnectionWrapper(lggr)}
if nodes[nodeAddress].conn == nil {
return nil, fmt.Errorf("error creating WSConnectionWrapper for node %s", nodeAddress)
}
}
dons[donConfig.DonId] = &donConnectionManager{
donConfig: &donConfig,
codec: codec,
nodes: nodes,
shutdownCh: make(chan struct{}),
lggr: lggr.Named("DONConnectionManager." + donConfig.DonId),
}
}
connMgr := &connectionManager{
config: &gwConfig.ConnectionManagerConfig,
dons: dons,
connAttempts: make(map[string]*connAttempt),
clock: clock,
lggr: lggr.Named("ConnectionManager"),
}
wsServer := network.NewWebSocketServer(&gwConfig.NodeServerConfig, connMgr, lggr)
connMgr.wsServer = wsServer
return connMgr, nil
}
func (m *connectionManager) DONConnectionManager(donId string) *donConnectionManager {
return m.dons[donId]
}
func (m *connectionManager) Start(ctx context.Context) error {
return m.StartOnce("ConnectionManager", func() error {
m.lggr.Info("starting connection manager")
for _, donConnMgr := range m.dons {
donConnMgr.closeWait.Add(len(donConnMgr.nodes))
for nodeAddress, nodeState := range donConnMgr.nodes {
if err := nodeState.conn.Start(ctx); err != nil {
return err
}
go donConnMgr.readLoop(nodeAddress, nodeState)
}
donConnMgr.closeWait.Add(1)
go donConnMgr.heartbeatLoop(m.config.HeartbeatIntervalSec)
}
return m.wsServer.Start(ctx)
})
}
func (m *connectionManager) Close() error {
return m.StopOnce("ConnectionManager", func() (err error) {
m.lggr.Info("closing connection manager")
err = multierr.Combine(err, m.wsServer.Close())
for _, donConnMgr := range m.dons {
close(donConnMgr.shutdownCh)
for _, nodeState := range donConnMgr.nodes {
nodeState.conn.Close()
}
}
for _, donConnMgr := range m.dons {
donConnMgr.closeWait.Wait()
}
return
})
}
func (m *connectionManager) StartHandshake(authHeader []byte) (attemptId string, challenge []byte, err error) {
m.lggr.Debug("StartHandshake")
authHeaderElems, signer, err := network.UnpackSignedAuthHeader(authHeader)
if err != nil {
return "", nil, multierr.Append(network.ErrAuthHeaderParse, err)
}
nodeAddress := "0x" + hex.EncodeToString(signer)
donConnMgr, ok := m.dons[authHeaderElems.DonId]
if !ok {
return "", nil, network.ErrAuthInvalidDonId
}
nodeState, ok := donConnMgr.nodes[nodeAddress]
if !ok {
return "", nil, network.ErrAuthInvalidNode
}
if authHeaderElems.GatewayId != m.config.AuthGatewayId {
return "", nil, network.ErrAuthInvalidGateway
}
nowTs := uint32(m.clock.Now().Unix())
ts := authHeaderElems.Timestamp
if ts < nowTs-m.config.AuthTimestampToleranceSec || nowTs+m.config.AuthTimestampToleranceSec < ts {
return "", nil, network.ErrAuthInvalidTimestamp
}
attemptId, challenge, err = m.newAttempt(nodeState, nodeAddress, ts)
if err != nil {
return "", nil, err
}
return attemptId, challenge, nil
}
func (m *connectionManager) newAttempt(nodeSt *nodeState, nodeAddress string, timestamp uint32) (string, []byte, error) {
challengeBytes := make([]byte, m.config.AuthChallengeLen)
_, err := rand.Read(challengeBytes)
if err != nil {
return "", nil, err
}
challenge := network.ChallengeElems{Timestamp: timestamp, GatewayId: m.config.AuthGatewayId, ChallengeBytes: challengeBytes}
m.connAttemptsMu.Lock()
defer m.connAttemptsMu.Unlock()
m.connAttemptCounter++
newId := fmt.Sprintf("%s_%d", nodeAddress, m.connAttemptCounter)
m.connAttempts[newId] = &connAttempt{nodeState: nodeSt, nodeAddress: nodeAddress, challenge: challenge, timestamp: timestamp}
return newId, network.PackChallenge(&challenge), nil
}
func (m *connectionManager) FinalizeHandshake(attemptId string, response []byte, conn *websocket.Conn) error {
m.lggr.Debugw("FinalizeHandshake", "attemptId", attemptId)
m.connAttemptsMu.Lock()
attempt, ok := m.connAttempts[attemptId]
delete(m.connAttempts, attemptId)
m.connAttemptsMu.Unlock()
if !ok {
return network.ErrChallengeAttemptNotFound
}
signer, err := common.ExtractSigner(response, network.PackChallenge(&attempt.challenge))
if err != nil || attempt.nodeAddress != "0x"+hex.EncodeToString(signer) {
return network.ErrChallengeInvalidSignature
}
if conn != nil {
conn.SetPongHandler(func(data string) error {
m.lggr.Debugw("received heartbeat pong from node", "nodeAddress", attempt.nodeAddress)
return nil
})
}
attempt.nodeState.conn.Reset(conn)
m.lggr.Infof("node %s connected", attempt.nodeAddress)
return nil
}
func (m *connectionManager) AbortHandshake(attemptId string) {
m.lggr.Debugw("AbortHandshake", "attemptId", attemptId)
m.connAttemptsMu.Lock()
defer m.connAttemptsMu.Unlock()
delete(m.connAttempts, attemptId)
}
func (m *connectionManager) GetPort() int {
return m.wsServer.GetPort()
}
func (m *donConnectionManager) SetHandler(handler handlers.Handler) {
m.handler = handler
}
func (m *donConnectionManager) SendToNode(ctx context.Context, nodeAddress string, msg *api.Message) error {
if msg == nil {
return errors.New("nil message")
}
data, err := m.codec.EncodeRequest(msg)
if err != nil {
return fmt.Errorf("error encoding request for node %s: %v", nodeAddress, err)
}
nodeState := m.nodes[nodeAddress]
if nodeState == nil {
return fmt.Errorf("node %s not found", nodeAddress)
}
return nodeState.conn.Write(ctx, websocket.BinaryMessage, data)
}
func (m *donConnectionManager) readLoop(nodeAddress string, nodeState *nodeState) {
ctx, _ := m.shutdownCh.NewCtx()
for {
select {
case <-m.shutdownCh:
m.closeWait.Done()
return
case item := <-nodeState.conn.ReadChannel():
msg, err := m.codec.DecodeResponse(item.Data)
if err != nil {
m.lggr.Errorw("parse error when reading from node", "nodeAddress", nodeAddress, "err", err)
break
}
if err = msg.Validate(); err != nil {
m.lggr.Errorw("message validation error when reading from node", "nodeAddress", nodeAddress, "err", err)
break
}
if msg.Body.Sender != nodeAddress {
m.lggr.Errorw("message sender mismatch when reading from node", "nodeAddress", nodeAddress, "sender", msg.Body.Sender)
break
}
err = m.handler.HandleNodeMessage(ctx, msg, nodeAddress)
if err != nil {
m.lggr.Error("error when calling HandleNodeMessage ", err)
}
}
}
}
func (m *donConnectionManager) heartbeatLoop(intervalSec uint32) {
ctx, _ := m.shutdownCh.NewCtx()
defer m.closeWait.Done()
if intervalSec == 0 {
m.lggr.Error("heartbeat interval is 0, heartbeat disabled")
return
}
m.lggr.Info("starting heartbeat loop")
ticker := time.NewTicker(time.Duration(intervalSec) * time.Second)
defer ticker.Stop()
for {
select {
case <-m.shutdownCh:
return
case <-ticker.C:
errorCount := 0
for nodeAddress, nodeState := range m.nodes {
err := nodeState.conn.Write(ctx, websocket.PingMessage, []byte{})
if err != nil {
m.lggr.Debugw("unable to send heartbeat to node", "nodeAddress", nodeAddress, "err", err)
errorCount++
}
}
promHeartbeatsSent.WithLabelValues(m.donConfig.DonId).Set(float64(len(m.nodes) - errorCount))
m.lggr.Infow("sent heartbeat to nodes", "donID", m.donConfig.DonId, "errCount", errorCount)
}
}
}