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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,68 +1,86 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "flag" | ||
| "fmt" | ||
| "log" | ||
| "os" | ||
|
|
||
| "github.com/google/uuid" | ||
| amqp "github.com/rabbitmq/amqp091-go" | ||
| cli "github.com/urfave/cli/v2" | ||
| ) | ||
|
|
||
| func fatalOnError(err error, msg string) { | ||
| if err != nil { | ||
| log.Fatalf("💥 %s: %s", msg, err) | ||
| } | ||
| } | ||
|
|
||
| func isFlagSet(name string) bool { | ||
| found := false | ||
| flag.Visit(func(f *flag.Flag) { | ||
| if f.Name == name { | ||
| found = true | ||
| } | ||
| }) | ||
| return found | ||
| } | ||
| var Version = "development" | ||
|
|
||
| func main() { | ||
| url := flag.String("url", "", "RabbitMQ url, must start with amqps:// or amqp://.") | ||
| exchange := flag.String("exchange", "", "Exchange name to listen messages.") | ||
| queue := flag.String("queue", "interceptor", "Interceptor queue name.") | ||
| routingKey := flag.String("bind", "#", "Routing key to bind.") | ||
| flag.Parse() | ||
| app := &cli.App{ | ||
| Name: "coyote", | ||
| Usage: "Coyote is a RabbitMQ message sink.", | ||
| Version: Version, | ||
| Flags: []cli.Flag{ | ||
| &cli.StringFlag{ | ||
| Name: "url", | ||
| Required: true, | ||
| Usage: "RabbitMQ url, must start with amqps:// or amqp://.", | ||
| }, | ||
| &cli.StringFlag{ | ||
| Name: "exchange", | ||
| Required: true, | ||
| Usage: "Exchange name to listen messages.", | ||
| }, | ||
| &cli.StringFlag{ | ||
| Name: "queue", | ||
| Value: "interceptor", | ||
| Usage: "Interceptor queue name.", | ||
| }, | ||
| &cli.StringFlag{ | ||
| Name: "bind", | ||
| Value: "#", | ||
| Usage: "Routing key to bind.", | ||
| }, | ||
| }, | ||
| Action: func(ctx *cli.Context) error { | ||
| conn, err := amqp.Dial(ctx.String("url")) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to connect to RabbitMQ: %w", err) | ||
| } | ||
| defer conn.Close() | ||
|
|
||
| if !isFlagSet("url") || !isFlagSet("exchange") { | ||
| flag.Usage() | ||
| os.Exit(1) | ||
| } | ||
| ch, err := conn.Channel() | ||
| if err != nil { | ||
| return fmt.Errorf("failed to open a channel: %w", err) | ||
| } | ||
| defer ch.Close() | ||
|
|
||
| conn, err := amqp.Dial(*url) | ||
| fatalOnError(err, "Failed to connect to RabbitMQ") | ||
| defer conn.Close() | ||
| err = ch.ExchangeDeclarePassive(ctx.String("exchange"), "topic", false, true, false, false, nil) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to connect to exchange: %w", err) | ||
| } | ||
|
|
||
| ch, err := conn.Channel() | ||
| fatalOnError(err, "Failed to open a channel") | ||
| defer ch.Close() | ||
| q, err := ch.QueueDeclare(fmt.Sprintf("%s.%s", ctx.String("queue"), uuid.NewString()), false, true, false, false, nil) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to declare a queue: %w", err) | ||
| } | ||
| ch.QueueBind(q.Name, ctx.String("bind"), ctx.String("exchange"), false, nil) | ||
|
|
||
| err = ch.ExchangeDeclarePassive(*exchange, "topic", false, true, false, false, nil) | ||
| fatalOnError(err, "Failed to connect to exchange") | ||
| msgs, err := ch.Consume(q.Name, "", true, false, false, false, nil) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to register a consumer: %w", err) | ||
| } | ||
|
|
||
| q, err := ch.QueueDeclare(fmt.Sprintf("%s.%s", *queue, uuid.NewString()), false, true, false, false, nil) | ||
| fatalOnError(err, "Failed to declare a queue") | ||
| ch.QueueBind(q.Name, *routingKey, *exchange, false, nil) | ||
| var forever chan struct{} | ||
| go func() { | ||
| for d := range msgs { | ||
| log.Printf("📧 Received a message on queue %s: %s", d.RoutingKey, d.Body) | ||
| } | ||
| }() | ||
|
|
||
| msgs, err := ch.Consume(q.Name, "", true, false, false, false, nil) | ||
| fatalOnError(err, "Failed to register a consumer") | ||
|
|
||
| var forever chan struct{} | ||
| go func() { | ||
| for d := range msgs { | ||
| log.Printf("📧 Received a message on queue %s: %s", d.RoutingKey, d.Body) | ||
| } | ||
| }() | ||
|
|
||
| log.Printf("⏳ Waiting for messages. To exit press CTRL+C") | ||
| <-forever | ||
| log.Printf("⏳ Waiting for messages. To exit press CTRL+C") | ||
| <-forever | ||
| return nil | ||
| }, | ||
| } | ||
| if err := app.Run(os.Args); err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| } |