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ReceiveMessage.go
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/
ReceiveMessage.go
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
// snippet-start:[sqs.go.receive_messages]
package main
// snippet-start:[sqs.go.receive_messages.imports]
import (
"flag"
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/sqs"
)
// snippet-end:[sqs.go.receive_messages.imports]
// GetQueueURL gets the URL of an Amazon SQS queue
// Inputs:
//
// sess is the current session, which provides configuration for the SDK's service clients
// queueName is the name of the queue
//
// Output:
//
// If success, the URL of the queue and nil
// Otherwise, an empty string and an error from the call to
func GetQueueURL(sess *session.Session, queue *string) (*sqs.GetQueueUrlOutput, error) {
// snippet-start:[sqs.go.receive_messages.queue_url]
svc := sqs.New(sess)
urlResult, err := svc.GetQueueUrl(&sqs.GetQueueUrlInput{
QueueName: queue,
})
// snippet-end:[sqs.go.receive_messages.queue_url]
if err != nil {
return nil, err
}
return urlResult, nil
}
// GetMessages gets the messages from an Amazon SQS queue
// Inputs:
//
// sess is the current session, which provides configuration for the SDK's service clients
// queueURL is the URL of the queue
// timeout is how long, in seconds, the message is unavailable to other consumers
//
// Output:
//
// If success, the latest message and nil
// Otherwise, nil and an error from the call to ReceiveMessage
func GetMessages(sess *session.Session, queueURL *string, timeout *int64) (*sqs.ReceiveMessageOutput, error) {
// Create an SQS service client
svc := sqs.New(sess)
// snippet-start:[sqs.go.receive_messages.call]
msgResult, err := svc.ReceiveMessage(&sqs.ReceiveMessageInput{
AttributeNames: []*string{
aws.String(sqs.MessageSystemAttributeNameSentTimestamp),
},
MessageAttributeNames: []*string{
aws.String(sqs.QueueAttributeNameAll),
},
QueueUrl: queueURL,
MaxNumberOfMessages: aws.Int64(1),
VisibilityTimeout: timeout,
})
// snippet-end:[sqs.go.receive_messages.call]
if err != nil {
return nil, err
}
return msgResult, nil
}
func main() {
// snippet-start:[sqs.go.receive_messages.args]
queue := flag.String("q", "", "The name of the queue")
timeout := flag.Int64("t", 5, "How long, in seconds, that the message is hidden from others")
flag.Parse()
if *queue == "" {
fmt.Println("You must supply the name of a queue (-q QUEUE)")
return
}
if *timeout < 0 {
*timeout = 0
}
if *timeout > 12*60*60 {
*timeout = 12 * 60 * 60
}
// snippet-end:[sqs.go.receive_messages.args]
// Create a session that gets credential values from ~/.aws/credentials
// and the default region from ~/.aws/config
// snippet-start:[sqs.go.receive_messages.sess]
sess := session.Must(session.NewSessionWithOptions(session.Options{
SharedConfigState: session.SharedConfigEnable,
}))
// snippet-end:[sqs.go.receive_messages.sess]
// Get URL of queue
urlResult, err := GetQueueURL(sess, queue)
if err != nil {
fmt.Println("Got an error getting the queue URL:")
fmt.Println(err)
return
}
// snippet-start:[sqs.go.receive_message.url]
queueURL := urlResult.QueueUrl
// snippet-end:[sqs.go.receive_message.url]
msgResult, err := GetMessages(sess, queueURL, timeout)
if err != nil {
fmt.Println("Got an error receiving messages:")
fmt.Println(err)
return
}
fmt.Println("Message ID: " + *msgResult.Messages[0].MessageId)
// snippet-start:[sqs.go.receive_messages.print_handle]
fmt.Println("Message Handle: " + *msgResult.Messages[0].ReceiptHandle)
// snippet-end:[sqs.go.receive_messages.print_handle]
}
// snippet-end:[sqs.go.receive_messages]