open-consul/agent/router/serf_adapter.go

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package router
import (
"github.com/hashicorp/consul/agent/metadata"
"github.com/hashicorp/consul/types"
"github.com/hashicorp/go-hclog"
"github.com/hashicorp/serf/serf"
)
// routerFn selects one of the router operations to map to incoming Serf events.
type routerFn func(types.AreaID, *metadata.Server) error
// handleMemberEvents attempts to apply the given Serf member event to the given
// router function.
func handleMemberEvent(logger hclog.Logger, fn routerFn, areaID types.AreaID, e serf.Event) {
me, ok := e.(serf.MemberEvent)
if !ok {
logger.Error("Bad event type", "event", e)
return
}
for _, m := range me.Members {
ok, parts := metadata.IsConsulServer(m)
if !ok {
logger.Warn("Non-server in server-only area",
"non_server", m.Name,
"area", areaID,
)
continue
}
if err := fn(areaID, parts); err != nil {
logger.Error("Failed to process event for server in area",
"event", me.Type.String(),
"server", m.Name,
"area", areaID,
"error", err,
)
continue
}
logger.Info("Handled event for server in area",
"event", me.Type.String(),
"server", m.Name,
"area", areaID,
)
}
}
// HandleSerfEvents is a long-running goroutine that pushes incoming events from
// a Serf manager's channel into the given router. This will return when the
// shutdown channel is closed.
func HandleSerfEvents(logger hclog.Logger, router *Router, areaID types.AreaID, shutdownCh <-chan struct{}, eventCh <-chan serf.Event) {
for {
select {
case <-shutdownCh:
return
case e := <-eventCh:
switch e.EventType() {
case serf.EventMemberJoin:
handleMemberEvent(logger, router.AddServer, areaID, e)
case serf.EventMemberLeave, serf.EventMemberReap:
handleMemberEvent(logger, router.RemoveServer, areaID, e)
case serf.EventMemberFailed:
handleMemberEvent(logger, router.FailServer, areaID, e)
// All of these event types are ignored.
case serf.EventMemberUpdate:
handleMemberEvent(logger, router.AddServer, areaID, e)
case serf.EventUser:
case serf.EventQuery:
default:
logger.Warn("Unhandled Serf Event", "event", e)
}
}
}
}