feat: EventSource and Sensor HA without extra RBAC #1163
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| package leaderelection | ||
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||
| import ( | ||
| "context" | ||
|
|
||
| "github.com/fsnotify/fsnotify" | ||
| "github.com/nats-io/graft" | ||
| nats "github.com/nats-io/nats.go" | ||
| "github.com/pkg/errors" | ||
| "github.com/spf13/viper" | ||
| "go.uber.org/zap" | ||
|
|
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| "github.com/argoproj/argo-events/common" | ||
| "github.com/argoproj/argo-events/common/logging" | ||
| eventbusdriver "github.com/argoproj/argo-events/eventbus/driver" | ||
| apicommon "github.com/argoproj/argo-events/pkg/apis/common" | ||
| eventbusv1alpha1 "github.com/argoproj/argo-events/pkg/apis/eventbus/v1alpha1" | ||
| ) | ||
|
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| type Elector interface { | ||
| RunOrDie(context.Context, LeaderCallbacks) | ||
| } | ||
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| type LeaderCallbacks struct { | ||
| OnStartedLeading func(context.Context) | ||
| OnStoppedLeading func() | ||
| } | ||
|
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| func NewEventBusElector(ctx context.Context, eventBusConfig eventbusv1alpha1.BusConfig, clusterName string, clusterSize int) (Elector, error) { | ||
| logger := logging.FromContext(ctx) | ||
| var eventBusType apicommon.EventBusType | ||
| var eventBusAuth *eventbusv1alpha1.AuthStrategy | ||
| if eventBusConfig.NATS != nil { | ||
| eventBusType = apicommon.EventBusNATS | ||
| eventBusAuth = eventBusConfig.NATS.Auth | ||
| } else { | ||
| return nil, errors.New("invalid event bus") | ||
| } | ||
| var auth *eventbusdriver.Auth | ||
| cred := &eventbusdriver.AuthCredential{} | ||
| if eventBusAuth == nil || *eventBusAuth == eventbusv1alpha1.AuthStrategyNone { | ||
| auth = &eventbusdriver.Auth{ | ||
| Strategy: eventbusv1alpha1.AuthStrategyNone, | ||
| } | ||
| } else { | ||
| v := viper.New() | ||
| v.SetConfigName("auth") | ||
| v.SetConfigType("yaml") | ||
| v.AddConfigPath(common.EventBusAuthFileMountPath) | ||
| err := v.ReadInConfig() | ||
| if err != nil { | ||
| return nil, errors.Errorf("failed to load auth.yaml. err: %+v", err) | ||
| } | ||
| err = v.Unmarshal(cred) | ||
| if err != nil { | ||
| logger.Errorw("failed to unmarshal auth.yaml", zap.Error(err)) | ||
| return nil, err | ||
| } | ||
| v.WatchConfig() | ||
| v.OnConfigChange(func(e fsnotify.Event) { | ||
| logger.Info("eventbus auth config file changed.") | ||
| err = v.Unmarshal(cred) | ||
| if err != nil { | ||
| logger.Errorw("failed to unmarshal auth.yaml after reloading", zap.Error(err)) | ||
| } | ||
| }) | ||
| auth = &eventbusdriver.Auth{ | ||
| Strategy: *eventBusAuth, | ||
| Crendential: cred, | ||
| } | ||
| } | ||
| var elector Elector | ||
| switch eventBusType { | ||
| case apicommon.EventBusNATS: | ||
| elector = &natsEventBusElector{ | ||
| clusterName: clusterName, | ||
| size: clusterSize, | ||
| url: eventBusConfig.NATS.URL, | ||
| auth: auth, | ||
| } | ||
| default: | ||
| return nil, errors.New("invalid eventbus type") | ||
| } | ||
| return elector, nil | ||
| } | ||
|
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| type natsEventBusElector struct { | ||
| clusterName string | ||
| size int | ||
| url string | ||
| auth *eventbusdriver.Auth | ||
| } | ||
|
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| func (e *natsEventBusElector) RunOrDie(ctx context.Context, callbacks LeaderCallbacks) { | ||
| log := logging.FromContext(ctx) | ||
| ci := graft.ClusterInfo{Name: e.clusterName, Size: e.size} | ||
| opts := &nats.DefaultOptions | ||
| opts.Url = e.url | ||
| if e.auth.Strategy == eventbusv1alpha1.AuthStrategyToken { | ||
| opts.Token = e.auth.Crendential.Token | ||
| } | ||
| rpc, err := graft.NewNatsRpc(opts) | ||
| if err != nil { | ||
| log.Fatalw("failed to new Nats Rpc", zap.Error(err)) | ||
| } | ||
| errChan := make(chan error) | ||
| stateChangeChan := make(chan graft.StateChange) | ||
| handler := graft.NewChanHandler(stateChangeChan, errChan) | ||
| node, err := graft.New(ci, handler, rpc, "/tmp/graft.log") | ||
| if err != nil { | ||
| log.Fatalw("failed to new a node", zap.Error(err)) | ||
| } | ||
| defer node.Close() | ||
|
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| cctx, cancel := context.WithCancel(ctx) | ||
| if node.State() == graft.LEADER { | ||
| log.Info("I'm the LEADER, starting ...") | ||
| go callbacks.OnStartedLeading(cctx) | ||
| } else { | ||
| log.Info("Not the LEADER, stand by ...") | ||
| } | ||
|
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| handleStateChange := func(sc graft.StateChange) { | ||
| switch sc.To { | ||
| case graft.LEADER: | ||
| log.Info("I'm the LEADER, starting ...") | ||
| go callbacks.OnStartedLeading(cctx) | ||
| case graft.FOLLOWER, graft.CANDIDATE: | ||
| log.Infof("Becoming a %v, stand by ...", sc.To) | ||
| if sc.From == graft.LEADER { | ||
| cancel() | ||
| callbacks.OnStoppedLeading() | ||
| cctx, cancel = context.WithCancel(ctx) | ||
| } | ||
| case graft.CLOSED: | ||
| if sc.From == graft.LEADER { | ||
| cancel() | ||
| callbacks.OnStoppedLeading() | ||
| } | ||
| log.Fatal("Leader elector connection was CLOSED") | ||
| default: | ||
| log.Fatalf("Unknown state: %s", sc.To) | ||
| } | ||
| } | ||
|
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| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| log.Info("exiting...") | ||
| cancel() | ||
| return | ||
| case sc := <-stateChangeChan: | ||
| handleStateChange(sc) | ||
| case err := <-errChan: | ||
| log.Errorw("Error happened", zap.Error(err)) | ||
| } | ||
| } | ||
| } | ||
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This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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normally defer a cancel?
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When current node is changed from
leaderto non-leader (line 128-133),cancel()need to be called to terminate the running service, and re-initiate a cctx and cancel. Not quite sure ifdefer cancel()still works in that case, let me do more testing.There was a problem hiding this comment.
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Using defer works, updated.