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example_test.go
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example_test.go
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package amqp_test
import (
"context"
"errors"
"fmt"
"log"
"time"
amqp "github.com/Azure/go-amqp"
)
func Example() {
ctx := context.TODO()
// create connection
conn, err := amqp.Dial(ctx, "amqps://my-namespace.servicebus.windows.net", &amqp.ConnOptions{
SASLType: amqp.SASLTypePlain("access-key-name", "access-key"),
})
if err != nil {
log.Fatal("Dialing AMQP server:", err)
}
defer conn.Close()
// open a session
session, err := conn.NewSession(ctx, nil)
if err != nil {
log.Fatal("Creating AMQP session:", err)
}
// send a message
{
// create a sender
sender, err := session.NewSender(ctx, "/queue-name", nil)
if err != nil {
log.Fatal("Creating sender link:", err)
}
ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
// send message
err = sender.Send(ctx, amqp.NewMessage([]byte("Hello!")), nil)
if err != nil {
log.Fatal("Sending message:", err)
}
sender.Close(ctx)
cancel()
}
// continuously read messages
{
// create a receiver
receiver, err := session.NewReceiver(ctx, "/queue-name", nil)
if err != nil {
log.Fatal("Creating receiver link:", err)
}
defer func() {
ctx, cancel := context.WithTimeout(ctx, 1*time.Second)
receiver.Close(ctx)
cancel()
}()
for {
// receive next message
msg, err := receiver.Receive(ctx, nil)
if err != nil {
log.Fatal("Reading message from AMQP:", err)
}
// accept message
if err = receiver.AcceptMessage(context.TODO(), msg); err != nil {
log.Fatalf("Failure accepting message: %v", err)
}
fmt.Printf("Message received: %s\n", msg.GetData())
}
}
}
func ExampleConnError() {
// *ConnErrors are returned when the underlying connection has been closed.
// this error is propagated to all child Session, Sender, and Receiver instances.
ctx := context.TODO()
// create connection
conn, err := amqp.Dial(ctx, "amqps://my-namespace.servicebus.windows.net", &amqp.ConnOptions{
SASLType: amqp.SASLTypePlain("access-key-name", "access-key"),
})
if err != nil {
log.Fatal("Dialing AMQP server:", err)
}
// open a session
session, err := conn.NewSession(ctx, nil)
if err != nil {
log.Fatal("Creating AMQP session:", err)
}
// create a sender
sender, err := session.NewSender(ctx, "/queue-name", nil)
if err != nil {
log.Fatal("Creating sender link:", err)
}
// close the connection before sending the message
conn.Close()
// attempt to send message on a closed connection
err = sender.Send(ctx, amqp.NewMessage([]byte("Hello!")), nil)
var connErr *amqp.ConnError
if !errors.As(err, &connErr) {
log.Fatalf("unexpected error type %T", err)
}
// similarly, methods on session will fail in the same way
_, err = session.NewReceiver(ctx, "/queue-name", nil)
if !errors.As(err, &connErr) {
log.Fatalf("unexpected error type %T", err)
}
// methods on the connection will also fail
_, err = conn.NewSession(ctx, nil)
if !errors.As(err, &connErr) {
log.Fatalf("unexpected error type %T", err)
}
}
func ExampleSessionError() {
// *SessionErrors are returned when a session has been closed.
// this error is propagated to all child Sender and Receiver instances.
ctx := context.TODO()
// create connection
conn, err := amqp.Dial(ctx, "amqps://my-namespace.servicebus.windows.net", &amqp.ConnOptions{
SASLType: amqp.SASLTypePlain("access-key-name", "access-key"),
})
if err != nil {
log.Fatal("Dialing AMQP server:", err)
}
defer conn.Close()
// open a session
session, err := conn.NewSession(ctx, nil)
if err != nil {
log.Fatal("Creating AMQP session:", err)
}
// create a sender
sender, err := session.NewSender(ctx, "/queue-name", nil)
if err != nil {
log.Fatal("Creating sender link:", err)
}
// close the session before sending the message
session.Close(ctx)
// attempt to send message on a closed session
err = sender.Send(ctx, amqp.NewMessage([]byte("Hello!")), nil)
var sessionErr *amqp.SessionError
if !errors.As(err, &sessionErr) {
log.Fatalf("unexpected error type %T", err)
}
// similarly, methods on session will fail in the same way
_, err = session.NewReceiver(ctx, "/queue-name", nil)
if !errors.As(err, &sessionErr) {
log.Fatalf("unexpected error type %T", err)
}
}
func ExampleLinkError() {
// *LinkError are returned by methods on Senders/Receivers after Close() has been called.
// it can also be returned if the peer has closed the link. in this case, the *RemoteErr
// field should contain additional information about why the peer closed the link.
ctx := context.TODO()
// create connection
conn, err := amqp.Dial(ctx, "amqps://my-namespace.servicebus.windows.net", &amqp.ConnOptions{
SASLType: amqp.SASLTypePlain("access-key-name", "access-key"),
})
if err != nil {
log.Fatal("Dialing AMQP server:", err)
}
defer conn.Close()
// open a session
session, err := conn.NewSession(ctx, nil)
if err != nil {
log.Fatal("Creating AMQP session:", err)
}
// create a sender
sender, err := session.NewSender(ctx, "/queue-name", nil)
if err != nil {
log.Fatal("Creating sender link:", err)
}
// send message
err = sender.Send(ctx, amqp.NewMessage([]byte("Hello!")), nil)
if err != nil {
log.Fatal("Creating AMQP session:", err)
}
// now close the sender
sender.Close(ctx)
// attempt to send a message after close
err = sender.Send(ctx, amqp.NewMessage([]byte("Hello!")), nil)
var linkErr *amqp.LinkError
if !errors.As(err, &linkErr) {
log.Fatalf("unexpected error type %T", err)
}
}