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peer.go
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peer.go
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// Copyright 2020 Authors of Cilium
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package relay
import (
"context"
"time"
peerpb "github.com/cilium/cilium/api/v1/peer"
"github.com/cilium/cilium/pkg/hubble/peer"
"github.com/sirupsen/logrus"
"google.golang.org/grpc"
)
func newConn(target string, dialTimeout time.Duration, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
ctx, cancel := context.WithTimeout(context.Background(), dialTimeout)
defer cancel()
return grpc.DialContext(ctx, target, opts...)
}
func newPeerClient(target string, dialTimeout time.Duration) (peerpb.PeerClient, *grpc.ClientConn, error) {
// the connection is assumed to be local
conn, err := newConn(target, dialTimeout, grpc.WithInsecure(), grpc.WithBlock())
if err != nil {
return nil, nil, err
}
return peerpb.NewPeerClient(conn), conn, nil
}
func (s *Server) syncPeers() {
ctx, cancel := context.WithCancel(context.Background())
connect:
for {
cl, conn, err := newPeerClient(s.opts.HubbleTarget, s.opts.DialTimeout)
if err != nil {
s.log.WithFields(logrus.Fields{
"error": err,
"dial timeout": s.opts.DialTimeout,
}).Warning("Failed to create peer client for peers synchronization; will try again after the timeout has expired")
select {
case <-s.stop:
cancel()
return
case <-time.After(s.opts.RetryTimeout):
continue
}
}
client, err := cl.Notify(ctx, &peerpb.NotifyRequest{})
if err != nil {
conn.Close()
s.log.WithFields(logrus.Fields{
"error": err,
"connection timeout": s.opts.RetryTimeout,
}).Warning("Failed to create peer notify client for peers change notification; will try again after the timeout has expired")
select {
case <-s.stop:
cancel()
return
case <-time.After(s.opts.RetryTimeout):
continue
}
}
for {
select {
case <-s.stop:
conn.Close()
cancel()
return
default:
}
cn, err := client.Recv()
if err != nil {
conn.Close()
s.log.WithFields(logrus.Fields{
"error": err,
"connection timeout": s.opts.RetryTimeout,
}).Warning("Error while receiving peer change notification; will try again after the timeout has expired")
select {
case <-s.stop:
cancel()
return
case <-time.After(s.opts.RetryTimeout):
continue connect
}
}
s.log.WithField("change notification", cn).Debug("Received peer change notification")
p := peer.FromChangeNotification(cn)
switch cn.GetType() {
case peerpb.ChangeNotificationType_PEER_ADDED:
s.addPeer(p)
case peerpb.ChangeNotificationType_PEER_DELETED:
s.deletePeer(p)
case peerpb.ChangeNotificationType_PEER_UPDATED:
s.updatePeer(p)
}
}
}
}
func (s *Server) connectPeer(name, addr string) {
s.log.WithFields(logrus.Fields{
"address": addr,
"dial timeout": s.opts.DialTimeout,
}).Debugf("Connecting peer %s...", name)
//FIXME: remove WithInsecure once mutual TLS is implemented
conn, connErr := newConn(addr, s.opts.DialTimeout, grpc.WithInsecure(), grpc.WithBlock())
var err error
s.mu.Lock()
if hp, ok := s.peers[name]; ok {
if hp.conn != nil { // make sure to close existing connection, if any
err = hp.conn.Close()
}
hp.conn = conn
hp.connErr = connErr
}
s.mu.Unlock()
if err != nil {
s.log.WithFields(logrus.Fields{
"error": err,
}).Warningf("Failed to properly close gRPC client connection to peer %s", name)
}
if connErr != nil {
s.log.WithFields(logrus.Fields{
"address": addr,
"dial timeout": s.opts.DialTimeout,
"error": connErr,
}).Warningf("Failed to create gRPC client connection to peer %s", name)
} else {
s.log.Debugf("Peer %s connected", name)
}
}
func (s *Server) disconnectPeer(name string) {
s.log.Debugf("Disconnecting peer %s...", name)
var err error
s.mu.Lock()
if hp, ok := s.peers[name]; ok && hp.conn != nil {
err = hp.conn.Close()
hp.conn = nil
}
s.mu.Unlock()
if err != nil {
s.log.WithFields(logrus.Fields{
"error": err,
}).Warningf("Failed to properly close gRPC client connection to peer %s", name)
}
s.log.Debugf("Peer %s disconnected", name)
}
func (s *Server) addPeer(p *peer.Peer) {
if p == nil {
return
}
hp := &hubblePeer{*p, nil, nil}
s.mu.Lock()
s.peers[p.Name] = hp
s.mu.Unlock()
// we don't want to block while waiting to establish a connection with the
// peer thus attempt to connect in the background
go s.connectPeer(p.Name, p.Address.String())
}
func (s *Server) deletePeer(p *peer.Peer) {
if p == nil {
return
}
s.disconnectPeer(p.Name)
s.mu.Lock()
delete(s.peers, p.Name)
s.mu.Unlock()
}
func (s *Server) updatePeer(p *peer.Peer) {
if p == nil {
return
}
s.disconnectPeer(p.Name)
s.addPeer(p)
}
func (s *Server) peerList() []hubblePeer {
s.mu.Lock()
p := make([]hubblePeer, 0, len(s.peers))
for _, v := range s.peers {
// note: there shouldn't be null entries in the map
p = append(p, *v)
}
s.mu.Unlock()
return p
}