open-consul/consul/merge.go

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package consul
import (
"fmt"
"github.com/hashicorp/serf/serf"
)
// lanMergeDelegate is used to handle a cluster merge on the LAN gossip
// ring. We check that the peers are in the same datacenter and abort the
// merge if there is a mis-match.
type lanMergeDelegate struct {
dc string
}
func (md *lanMergeDelegate) NotifyMerge(members []*serf.Member) error {
for _, m := range members {
ok, dc := isConsulNode(*m)
if ok {
if dc != md.dc {
return fmt.Errorf("Member '%s' part of wrong datacenter '%s'",
m.Name, dc)
}
continue
}
ok, parts := isConsulServer(*m)
if ok && parts.Datacenter != md.dc {
return fmt.Errorf("Member '%s' part of wrong datacenter '%s'",
m.Name, parts.Datacenter)
}
}
return nil
}
// wanMergeDelegate is used to handle a cluster merge on the WAN gossip
// ring. We check that the peers are server nodes and abort the merge
// otherwise.
type wanMergeDelegate struct {
}
func (md *wanMergeDelegate) NotifyMerge(members []*serf.Member) error {
for _, m := range members {
ok, _ := isConsulServer(*m)
if !ok {
return fmt.Errorf("Member '%s' is not a server", m.Name)
}
}
return nil
}