open-consul/consul/serf.go

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package consul
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import (
"github.com/hashicorp/serf/serf"
"net"
"strings"
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)
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const (
// StatusReap is used to update the status of a node if we
// are handling a EventMemberReap
StatusReap = serf.MemberStatus(-1)
)
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// lanEventHandler is used to handle events from the lan Serf cluster
func (s *Server) lanEventHandler() {
for {
select {
case e := <-s.eventChLAN:
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switch e.EventType() {
case serf.EventMemberJoin:
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fallthrough
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case serf.EventMemberLeave:
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fallthrough
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case serf.EventMemberFailed:
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fallthrough
case serf.EventMemberReap:
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s.localMemberEvent(e.(serf.MemberEvent))
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case serf.EventUser:
s.localEvent(e.(serf.UserEvent))
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case serf.EventMemberUpdate: // Ignore
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case serf.EventQuery: // Ignore
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default:
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s.logger.Printf("[WARN] consul: unhandled LAN Serf Event: %#v", e)
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}
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case <-s.shutdownCh:
return
}
}
}
// wanEventHandler is used to handle events from the wan Serf cluster
func (s *Server) wanEventHandler() {
for {
select {
case e := <-s.eventChWAN:
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switch e.EventType() {
case serf.EventMemberJoin:
s.remoteJoin(e.(serf.MemberEvent))
case serf.EventMemberLeave:
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fallthrough
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case serf.EventMemberFailed:
s.remoteFailed(e.(serf.MemberEvent))
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case serf.EventMemberUpdate: // Ignore
case serf.EventMemberReap: // Ignore
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case serf.EventUser:
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case serf.EventQuery: // Ignore
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default:
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s.logger.Printf("[WARN] consul: unhandled WAN Serf Event: %#v", e)
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}
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case <-s.shutdownCh:
return
}
}
}
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// localMemberEvent is used to reconcile Serf events with the strongly
// consistent store if we are the current leader
func (s *Server) localMemberEvent(me serf.MemberEvent) {
// Do nothing if we are not the leader
if !s.IsLeader() {
return
}
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// Check if this is a reap event
isReap := me.EventType() == serf.EventMemberReap
// Queue the members for reconciliation
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for _, m := range me.Members {
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// Change the status if this is a reap event
if isReap {
m.Status = StatusReap
}
select {
case s.reconcileCh <- m:
default:
}
}
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}
// localEvent is called when we receive an event on the local Serf
func (s *Server) localEvent(event serf.UserEvent) {
// Handle only consul events
if !strings.HasPrefix(event.Name, "consul:") {
return
}
switch event.Name {
case newLeaderEvent:
s.logger.Printf("[INFO] consul: New leader elected: %s", event.Payload)
// Trigger the callback
if s.config.ServerUp != nil {
s.config.ServerUp()
}
default:
s.logger.Printf("[WARN] consul: Unhandled local event: %v", event)
}
}
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// remoteJoin is used to handle join events on the wan serf cluster
func (s *Server) remoteJoin(me serf.MemberEvent) {
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for _, m := range me.Members {
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ok, parts := isConsulServer(m)
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if !ok {
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s.logger.Printf("[WARN] consul: non-server in WAN pool: %s %s", m.Name)
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continue
}
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var addr net.Addr = &net.TCPAddr{IP: m.Addr, Port: parts.Port}
s.logger.Printf("[INFO] consul: adding server for datacenter: %s, addr: %s", parts.Datacenter, addr)
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// Check if this server is known
found := false
s.remoteLock.Lock()
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existing := s.remoteConsuls[parts.Datacenter]
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for _, e := range existing {
if e.String() == addr.String() {
found = true
break
}
}
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// Add ot the list if not known
if !found {
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s.remoteConsuls[parts.Datacenter] = append(existing, addr)
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}
s.remoteLock.Unlock()
}
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}
// remoteFailed is used to handle fail events on the wan serf cluster
func (s *Server) remoteFailed(me serf.MemberEvent) {
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for _, m := range me.Members {
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ok, parts := isConsulServer(m)
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if !ok {
continue
}
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var addr net.Addr = &net.TCPAddr{IP: m.Addr, Port: parts.Port}
s.logger.Printf("[INFO] consul: removing server for datacenter: %s, addr: %s", parts.Datacenter, addr)
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// Remove the server if known
s.remoteLock.Lock()
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existing := s.remoteConsuls[parts.Datacenter]
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n := len(existing)
for i := 0; i < n; i++ {
if existing[i].String() == addr.String() {
existing[i], existing[n-1] = existing[n-1], nil
existing = existing[:n-1]
n--
break
}
}
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// Trim the list if all known consuls are dead
if n == 0 {
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delete(s.remoteConsuls, parts.Datacenter)
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} else {
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s.remoteConsuls[parts.Datacenter] = existing
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}
s.remoteLock.Unlock()
}
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}