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Merge pull request #341 from lovoo/visitor-tool-poc
Visitor Tool implementation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "log" | ||
| "os" | ||
| "os/signal" | ||
| "syscall" | ||
| "time" | ||
|
|
||
| "github.com/lovoo/goka" | ||
| "github.com/lovoo/goka/codec" | ||
| "github.com/lovoo/goka/multierr" | ||
| ) | ||
|
|
||
| var ( | ||
| brokers = []string{"localhost:9092"} | ||
| topic goka.Stream = "example-migration-clicks-input" | ||
| group goka.Group = "example-migration-group" | ||
|
|
||
| tmc *goka.TopicManagerConfig | ||
| ) | ||
|
|
||
| func init() { | ||
| // This sets the default replication to 1. If you have more then one broker | ||
| // the default configuration can be used. | ||
| tmc = goka.NewTopicManagerConfig() | ||
| tmc.Table.Replication = 1 | ||
| tmc.Stream.Replication = 1 | ||
| } | ||
|
|
||
| // emit messages until stopped | ||
| func runEmitter(ctx context.Context) { | ||
| emitter, err := goka.NewEmitter(brokers, topic, new(codec.Int64)) | ||
| if err != nil { | ||
| log.Fatalf("error creating emitter: %v", err) | ||
| } | ||
| defer emitter.Finish() | ||
| ticker := time.NewTicker(100 * time.Millisecond) | ||
| defer ticker.Stop() | ||
| for i := 0; ; i++ { | ||
| select { | ||
| case <-ticker.C: | ||
|
|
||
| err = emitter.EmitSync(fmt.Sprintf("key-%d", i%10), int64(1)) | ||
| if err != nil { | ||
| log.Fatalf("error emitting message: %v", err) | ||
| } | ||
| case <-ctx.Done(): | ||
| return | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func main() { | ||
|
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| tm, err := goka.NewTopicManager(brokers, goka.DefaultConfig(), tmc) | ||
| if err != nil { | ||
| log.Fatalf("Error creating topic manager: %v", err) | ||
| } | ||
| err = tm.EnsureStreamExists(string(topic), 8) | ||
| if err != nil { | ||
| log.Printf("Error creating kafka topic %s: %v", topic, err) | ||
| } | ||
|
|
||
| sigs := make(chan os.Signal) | ||
| go func() { | ||
| signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM, syscall.SIGKILL) | ||
| }() | ||
|
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| ctx, cancel := context.WithCancel(context.Background()) | ||
| defer cancel() | ||
| errg, ctx := multierr.NewErrGroup(ctx) | ||
|
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| g := goka.DefineGroup(group, | ||
| goka.Input(topic, new(codec.Int64), func(ctx goka.Context, msg interface{}) { | ||
| var counter int64 | ||
| if val := ctx.Value(); val != nil { | ||
| counter = val.(int64) | ||
| } | ||
| counter += msg.(int64) | ||
| log.Printf("%s: %d", ctx.Key(), counter) | ||
| ctx.SetValue(counter) | ||
|
|
||
| }), | ||
| goka.Visitor("reset", func(ctx goka.Context, meta interface{}) { | ||
| log.Printf("resetting %s: %d", ctx.Key(), meta.(int64)) | ||
| ctx.SetValue(meta) | ||
| }), | ||
| goka.Persist(new(codec.Int64)), | ||
| ) | ||
|
|
||
| proc, err := goka.NewProcessor(brokers, | ||
| g, | ||
| goka.WithTopicManagerBuilder(goka.TopicManagerBuilderWithTopicManagerConfig(tmc)), | ||
| ) | ||
| if err != nil { | ||
| log.Fatalf("error creating processor: %v", err) | ||
| } | ||
|
|
||
| // start the emitter | ||
| errg.Go(func() error { | ||
| runEmitter(ctx) | ||
| return nil | ||
| }) | ||
|
|
||
| // start the processor | ||
| errg.Go(func() error { | ||
| return proc.Run(ctx) | ||
| }) | ||
|
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||
| errg.Go(func() error { | ||
| select { | ||
| case <-sigs: | ||
| case <-ctx.Done(): | ||
| } | ||
| cancel() | ||
| return nil | ||
| }) | ||
|
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| time.Sleep(5 * time.Second) | ||
|
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| if err := proc.VisitAll(ctx, "reset", int64(0)); err != nil { | ||
| log.Printf("error visiting: %v", err) | ||
| } | ||
|
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| time.Sleep(5 * time.Second) | ||
| log.Printf("stopping...") | ||
| cancel() | ||
| if err := errg.Wait().NilOrError(); err != nil { | ||
| log.Fatalf("error running: %v", err) | ||
| } | ||
| log.Printf("done.") | ||
|
|
||
| } |
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