forked from hashicorp/serf
/
ipc_event_stream.go
141 lines (128 loc) · 2.94 KB
/
ipc_event_stream.go
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package agent
import (
"fmt"
"github.com/hashicorp/serf/serf"
"log"
)
type streamClient interface {
Send(*responseHeader, interface{}) error
RegisterQuery(*serf.Query) uint64
}
// eventStream is used to stream events to a client over IPC
type eventStream struct {
client streamClient
eventCh chan serf.Event
filters []EventFilter
logger *log.Logger
seq uint64
}
func newEventStream(client streamClient, filters []EventFilter, seq uint64, logger *log.Logger) *eventStream {
es := &eventStream{
client: client,
eventCh: make(chan serf.Event, 512),
filters: filters,
logger: logger,
seq: seq,
}
go es.stream()
return es
}
func (es *eventStream) HandleEvent(e serf.Event) {
// Check the event
for _, f := range es.filters {
if f.Invoke(e) {
goto HANDLE
}
}
return
// Do a non-blocking send
HANDLE:
select {
case es.eventCh <- e:
default:
es.logger.Printf("[WARN] agent.ipc: Dropping event to %v", es.client)
}
}
func (es *eventStream) Stop() {
close(es.eventCh)
}
func (es *eventStream) stream() {
var err error
for event := range es.eventCh {
switch e := event.(type) {
case serf.MemberEvent:
err = es.sendMemberEvent(e)
case serf.UserEvent:
err = es.sendUserEvent(e)
case *serf.Query:
err = es.sendQuery(e)
default:
err = fmt.Errorf("Unknown event type: %s", event.EventType().String())
}
if err != nil {
es.logger.Printf("[ERR] agent.ipc: Failed to stream event to %v: %v",
es.client, err)
return
}
}
}
// sendMemberEvent is used to send a single member event
func (es *eventStream) sendMemberEvent(me serf.MemberEvent) error {
members := make([]Member, 0, len(me.Members))
for _, m := range me.Members {
sm := Member{
Name: m.Name,
Addr: m.Addr,
Port: m.Port,
Tags: m.Tags,
Status: m.Status.String(),
ProtocolMin: m.ProtocolMin,
ProtocolMax: m.ProtocolMax,
ProtocolCur: m.ProtocolCur,
DelegateMin: m.DelegateMin,
DelegateMax: m.DelegateMax,
DelegateCur: m.DelegateCur,
}
members = append(members, sm)
}
header := responseHeader{
Seq: es.seq,
Error: "",
}
rec := memberEventRecord{
Event: me.String(),
Members: members,
}
return es.client.Send(&header, &rec)
}
// sendUserEvent is used to send a single user event
func (es *eventStream) sendUserEvent(ue serf.UserEvent) error {
header := responseHeader{
Seq: es.seq,
Error: "",
}
rec := userEventRecord{
Event: ue.EventType().String(),
LTime: ue.LTime,
Name: ue.Name,
Payload: ue.Payload,
Coalesce: ue.Coalesce,
}
return es.client.Send(&header, &rec)
}
// sendQuery is used to send a single query event
func (es *eventStream) sendQuery(q *serf.Query) error {
id := es.client.RegisterQuery(q)
header := responseHeader{
Seq: es.seq,
Error: "",
}
rec := queryEventRecord{
Event: q.EventType().String(),
ID: id,
LTime: q.LTime,
Name: q.Name,
Payload: q.Payload,
}
return es.client.Send(&header, &rec)
}