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