open-consul/lib/serf/serf.go

83 lines
1.9 KiB
Go

package serf
import (
"time"
"github.com/hashicorp/go-hclog"
"github.com/hashicorp/serf/serf"
)
const (
ReconnectTimeoutTag = "rc_tm"
)
// DefaultConfig returns a Consul-flavored Serf default configuration,
// suitable as a basis for a LAN, WAN, segment, or area.
func DefaultConfig() *serf.Config {
base := serf.DefaultConfig()
// This effectively disables the annoying queue depth warnings.
base.QueueDepthWarning = 1000000
// This enables dynamic sizing of the message queue depth based on the
// cluster size.
base.MinQueueDepth = 4096
// This gives leaves some time to propagate through the cluster before
// we shut down. The value was chosen to be reasonably short, but to
// allow a leave to get to over 99.99% of the cluster with 100k nodes
// (using https://www.serf.io/docs/internals/simulator.html).
base.LeavePropagateDelay = 3 * time.Second
return base
}
func GetTags(serf *serf.Serf) map[string]string {
tags := make(map[string]string)
for tag, value := range serf.LocalMember().Tags {
tags[tag] = value
}
return tags
}
func UpdateTag(serf *serf.Serf, tag, value string) {
tags := GetTags(serf)
tags[tag] = value
serf.SetTags(tags)
}
type ReconnectOverride struct {
logger hclog.Logger
}
func NewReconnectOverride(logger hclog.Logger) *ReconnectOverride {
if logger == nil {
logger = hclog.Default()
}
return &ReconnectOverride{
logger: logger,
}
}
func (r *ReconnectOverride) ReconnectTimeout(m *serf.Member, timeout time.Duration) time.Duration {
val, ok := m.Tags[ReconnectTimeoutTag]
if !ok {
return timeout
}
newTimeout, err := time.ParseDuration(val)
if err != nil {
r.logger.Warn("Member is advertising a malformed reconnect timeout", "member", m.Name, "rc_tm", val)
return timeout
}
// ignore a timeout of 0 as that indicates the default should be used
if newTimeout == 0 {
return timeout
}
return newTimeout
}