|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "flag" |
| 5 | + "fmt" |
| 6 | + "github.com/streadway/amqp" |
| 7 | + "io/ioutil" |
| 8 | + "os" |
| 9 | + "path" |
| 10 | +) |
| 11 | + |
| 12 | +var ( |
| 13 | + uri = flag.String("uri", "amqp://guest:guest@localhost:5672/", "AMQP URI") |
| 14 | + queue = flag.String("queue", "", "Ephemeral AMQP queue name") |
| 15 | + maxMessages = flag.Uint("max-messages", 1000, "Maximum number of messages to dump") |
| 16 | + outputDir = flag.String("output-dir", ".", "Directory in which to save the dumped messages") |
| 17 | + verbose = flag.Bool("verbose", false, "Print progress") |
| 18 | +) |
| 19 | + |
| 20 | +func main() { |
| 21 | + flag.Parse() |
| 22 | + err := DumpMessagesFromQueue(*uri, *queue, *maxMessages, *outputDir) |
| 23 | + if err != nil { |
| 24 | + fmt.Fprintf(os.Stderr, "%s\n", err) |
| 25 | + os.Exit(1) |
| 26 | + } |
| 27 | +} |
| 28 | + |
| 29 | +func DumpMessagesFromQueue(amqpURI string, queueName string, maxMessages uint, outputDir string) error { |
| 30 | + var err error |
| 31 | + |
| 32 | + if queueName == "" { |
| 33 | + return fmt.Errorf("Must supply queue name") |
| 34 | + } |
| 35 | + |
| 36 | + VerboseLog(fmt.Sprintf("Dialing %q", amqpURI)) |
| 37 | + conn, err := amqp.Dial(amqpURI) |
| 38 | + if err != nil { |
| 39 | + return fmt.Errorf("Dial: %s", err) |
| 40 | + } |
| 41 | + |
| 42 | + defer func() { |
| 43 | + conn.Close() |
| 44 | + VerboseLog("AMQP connection closed") |
| 45 | + }() |
| 46 | + |
| 47 | + channel, err := conn.Channel() |
| 48 | + if err != nil { |
| 49 | + return fmt.Errorf("Channel: %s", err) |
| 50 | + } |
| 51 | + |
| 52 | + VerboseLog(fmt.Sprintf("Pulling messages from queue %q", queueName)) |
| 53 | + for messagesReceived := uint(0); messagesReceived < maxMessages; messagesReceived++ { |
| 54 | + msg, ok, err := channel.Get(queueName, |
| 55 | + false, // autoAck |
| 56 | + ) |
| 57 | + if err != nil { |
| 58 | + return fmt.Errorf("Queue Get: %s", err) |
| 59 | + } |
| 60 | + if ok { |
| 61 | + SaveMessageToFile(msg.Body, outputDir, messagesReceived) |
| 62 | + } else { |
| 63 | + VerboseLog("No more messages in queue") |
| 64 | + break |
| 65 | + } |
| 66 | + } |
| 67 | + |
| 68 | + return nil |
| 69 | +} |
| 70 | + |
| 71 | +func SaveMessageToFile(body []byte, outputDir string, counter uint) { |
| 72 | + filePath := GenerateFilePath(outputDir, counter) |
| 73 | + ioutil.WriteFile(filePath, body, 0644) |
| 74 | + fmt.Println(filePath) |
| 75 | +} |
| 76 | + |
| 77 | +func GenerateFilePath(outputDir string, counter uint) string { |
| 78 | + return path.Join(outputDir, fmt.Sprintf("msg-%04d", counter)) |
| 79 | +} |
| 80 | + |
| 81 | +func VerboseLog(msg string) { |
| 82 | + if *verbose { |
| 83 | + fmt.Println("*", msg) |
| 84 | + } |
| 85 | +} |
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