83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
package router
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import (
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"github.com/hashicorp/consul/agent/metadata"
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"github.com/hashicorp/consul/types"
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"github.com/hashicorp/go-hclog"
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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, *metadata.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 hclog.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.Error("Bad event type", "event", 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 := metadata.IsConsulServer(m)
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if !ok {
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logger.Warn("Non-server in server-only area",
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"non_server", m.Name,
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"area", areaID,
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)
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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.Error("Failed to process event for server in area",
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"event", me.Type.String(),
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"server", m.Name,
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"area", areaID,
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"error", err,
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)
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continue
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}
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logger.Info("Handled event for server in area",
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"event", me.Type.String(),
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"server", m.Name,
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"area", areaID,
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)
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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 hclog.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, serf.EventMemberReap:
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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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case serf.EventMemberUpdate:
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handleMemberEvent(logger, router.AddServer, areaID, e)
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// All of these event types are ignored.
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case serf.EventUser:
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case serf.EventQuery:
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default:
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logger.Warn("Unhandled Serf Event", "event", e)
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}
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}
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}
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}
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