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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "net/url" | ||
| "os" | ||
| "os/signal" | ||
|
|
||
| "github.com/pkg/errors" | ||
| "github.com/segmentio/conf" | ||
| "github.com/segmentio/events" | ||
| _ "github.com/segmentio/events/ecslogs" | ||
| _ "github.com/segmentio/events/log" | ||
| _ "github.com/segmentio/events/sigevents" | ||
| _ "github.com/segmentio/events/text" | ||
| kafka "github.com/segmentio/kafka-go" | ||
| ) | ||
|
|
||
| var version = "" | ||
|
|
||
| func main() { | ||
| var err error | ||
| var ld = conf.Loader{ | ||
| Name: "kafkacli", | ||
| Args: os.Args[1:], | ||
| Commands: []conf.Command{ | ||
| {"tail", "Tail a partition or topic"}, | ||
| {"help", "Show the kafkacli help"}, | ||
| {"version", "Show the kafkacli version"}, | ||
| }, | ||
| } | ||
|
|
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| switch cmd, args := conf.LoadWith(nil, ld); cmd { | ||
| case "tail": | ||
| err = tail(args) | ||
| case "help": | ||
| ld.PrintHelp(nil) | ||
| case "version": | ||
| fmt.Println(version) | ||
| default: | ||
| panic("unreachable") | ||
| } | ||
|
|
||
| if err != nil { | ||
| events.Log("%{error}s", err) | ||
| os.Exit(1) | ||
| } | ||
| } | ||
|
|
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| func tail(args []string) (err error) { | ||
| config := struct { | ||
| Debug bool `conf:"debug"` | ||
| ConsulURL string `conf:"consul-url"` | ||
| KafkaURL string `conf:"kafka-url"` | ||
| }{ | ||
| Debug: false, | ||
| ConsulURL: "http://localhost:8500", | ||
| KafkaURL: "kafka://localhost:9092/events", | ||
| } | ||
|
|
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| conf.LoadWith(&config, conf.Loader{ | ||
| Name: "kafkacli tail", | ||
| Args: args, | ||
| }) | ||
|
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| events.DefaultLogger.EnableDebug = config.Debug | ||
| events.DefaultLogger.EnableSource = config.Debug | ||
|
|
||
| defer func() { | ||
| if v := recover(); v != nil { | ||
| err = convertPanicToError(v) | ||
| } | ||
| }() | ||
|
|
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| url, err := url.Parse(config.KafkaURL) | ||
| if err != nil { | ||
| return errors.Wrap(err, "failed to parse kafka url") | ||
| } | ||
|
|
||
| if url.Scheme != "kafka" { | ||
| return errors.New("invalid kafka url scheme") | ||
| } | ||
|
|
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| broker := url.Host | ||
| topic := url.Path[1:len(url.Path)] | ||
|
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| fmt.Printf("topic: %s\n", topic) | ||
| fmt.Printf("broker: %s\n", broker) | ||
|
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| reader, err := kafka.NewReader(kafka.ReaderConfig{ | ||
| Brokers: []string{broker}, | ||
| Topic: topic, | ||
| Partition: 0, | ||
| }) | ||
|
|
||
| if err != nil { | ||
| return | ||
| } | ||
|
|
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| ctx, cancel := context.WithCancel(context.Background()) | ||
| defer cancel() | ||
|
|
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| offset, err := reader.Seek(ctx, kafka.OffsetOldest) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
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| fmt.Printf("starting at offset: %d\n", offset) | ||
| fmt.Println("") | ||
|
|
||
| for { | ||
| msg, err := reader.Read(ctx) | ||
| if err != nil { | ||
| fmt.Printf("error reading message: %s\n", err.Error()) | ||
| continue | ||
| } | ||
|
|
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| fmt.Printf("read message at offset %d:\n\t%v\n\n", msg.Offset, string(msg.Value)) | ||
| } | ||
|
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| return reader.Close() | ||
| } | ||
|
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| func signals(signals ...os.Signal) (<-chan os.Signal, func()) { | ||
| sigchan := make(chan os.Signal) | ||
| sigrecv := events.Signal(sigchan) | ||
| signal.Notify(sigchan, signals...) | ||
| return sigrecv, func() { signal.Stop(sigchan) } | ||
| } | ||
|
|
||
| func convertPanicToError(v interface{}) error { | ||
| switch x := v.(type) { | ||
| case error: | ||
| return x | ||
| case string: | ||
| return errors.New(x) | ||
| default: | ||
| return fmt.Errorf("%v", x) | ||
| } | ||
| } |
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