// Message decodes the message containined in a delivery.
// Will return an error if delivery.HasMessage() is false.
func (delivery Delivery) Message() (m amqp.Message, err error) {
if !delivery.Readable() || delivery.Partial() {
return nil, internal.Errorf("attempting to get incomplete message")
}
data := make([]byte, delivery.Pending())
result := delivery.Link().Recv(data)
if result != len(data) {
return nil, internal.Errorf("cannot receive message: %s", internal.PnErrorCode(result))
}
m = amqp.NewMessage()
err = m.Decode(data)
return
}
func main() {
flag.Usage = usage
flag.Parse()
urls := flag.Args() // Non-flag arguments are URLs to receive from
if len(urls) == 0 {
log.Println("No URL provided")
flag.Usage()
os.Exit(1)
}
sentChan := make(chan sent) // Channel to receive all the delivery receipts.
var wait sync.WaitGroup // Used by main() to wait for all goroutines to end.
wait.Add(len(urls)) // Wait for one goroutine per URL.
container := concurrent.NewContainer("")
var connections []concurrent.Connection // Store connctions to close on exit
// Start a goroutine for each URL to send messages.
for _, urlStr := range urls {
util.Debugf("Connecting to %v\n", urlStr)
go func(urlStr string) {
defer wait.Done() // Notify main() that this goroutine is done.
url, err := amqp.ParseURL(urlStr) // Like net/url.Parse() but with AMQP defaults.
util.ExitIf(err)
// Open a new connection
conn, err := net.Dial("tcp", url.Host) // Note net.URL.Host is actually "host:port"
util.ExitIf(err)
c, err := container.NewConnection(conn)
util.ExitIf(err)
err = c.Open()
util.ExitIf(err)
connections = append(connections, c) // Save connection so it will be closed when main() ends
// Create and open a session
ss, err := c.NewSession()
util.ExitIf(err)
err = ss.Open()
util.ExitIf(err)
// Create a Sender using the path of the URL as the AMQP address
s, err := ss.Sender(url.Path)
util.ExitIf(err)
// Loop sending messages.
for i := int64(0); i < *count; i++ {
m := amqp.NewMessage()
body := fmt.Sprintf("%v-%v", url.Path, i)
m.Marshal(body)
sentMessage, err := s.Send(m)
util.ExitIf(err)
sentChan <- sent{body, sentMessage}
}
}(urlStr)
}
// Wait for all the acknowledgements
expect := int(*count) * len(urls)
util.Debugf("Started senders, expect %v acknowledgements\n", expect)
for i := 0; i < expect; i++ {
d := <-sentChan
disposition, err := d.sentMessage.Disposition()
if err != nil {
util.Debugf("acknowledgement[%v] %v error: %v\n", i, d.name, err)
} else {
util.Debugf("acknowledgement[%v] %v (%v)\n", i, d.name, disposition)
}
}
fmt.Printf("Received all %v acknowledgements\n", expect)
wait.Wait() // Wait for all goroutines to finish.
for _, c := range connections { // Close all connections
if c != nil {
c.Close(nil)
}
}
}