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main.go
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main.go
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package main
import (
"flag"
"log"
"os"
"sync"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials/stscreds"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/sqs"
)
func main() {
src := flag.String("src", "", "source queue")
dest := flag.String("dest", "", "destination queue")
clients := flag.Int("clients", 1, "number of clients")
mfa := flag.Bool("mfa", false, "multifactor authentication")
flag.Parse()
if *src == "" || *dest == "" || *clients < 1 {
flag.Usage()
os.Exit(1)
}
log.Printf("source queue : %v", *src)
log.Printf("destination queue : %v", *dest)
log.Printf("number of clients : %v", *clients)
log.Printf("multifactor authentication : %v", *mfa)
// enable automatic use of AWS_PROFILE like awscli and other tools do.
opts := session.Options{
SharedConfigState: session.SharedConfigEnable,
}
// add mfa to options if flag is set
if *mfa {
opts.AssumeRoleTokenProvider = stscreds.StdinTokenProvider
}
sess, err := session.NewSessionWithOptions(opts)
if err != nil {
panic(err)
}
maxMessages := int64(10)
waitTime := int64(0)
messageAttributeNames := aws.StringSlice([]string{"All"})
rmin := &sqs.ReceiveMessageInput{
QueueUrl: src,
MaxNumberOfMessages: &maxMessages,
WaitTimeSeconds: &waitTime,
MessageAttributeNames: messageAttributeNames,
}
var wg sync.WaitGroup
defer wg.Done()
for i := 1; i <= *clients; i++ {
wg.Add(i)
go transferMessages(sess, rmin, dest, &wg)
}
wg.Wait()
log.Println("all done")
}
//transferMessages loops, transferring a number of messages from the src to the dest at an interval.
func transferMessages(theSession *session.Session, rmin *sqs.ReceiveMessageInput, dest *string, wgOuter *sync.WaitGroup) {
client := sqs.New(theSession)
lastMessageCount := int(1)
defer wgOuter.Done()
// loop as long as there are messages on the queue
for {
resp, err := client.ReceiveMessage(rmin)
if err != nil {
panic(err)
}
if lastMessageCount == 0 && len(resp.Messages) == 0 {
// no messages returned twice now, the queue is probably empty
log.Printf("done")
return
}
lastMessageCount = len(resp.Messages)
log.Printf("received %v messages...", len(resp.Messages))
var wg sync.WaitGroup
wg.Add(len(resp.Messages))
for _, m := range resp.Messages {
go func(m *sqs.Message) {
defer wg.Done()
// write the message to the destination queue
smi := sqs.SendMessageInput{
MessageAttributes: m.MessageAttributes,
MessageBody: m.Body,
QueueUrl: dest,
}
_, err := client.SendMessage(&smi)
if err != nil {
log.Printf("ERROR sending message to destination %v", err)
return
}
// message was sent, dequeue from source queue
dmi := &sqs.DeleteMessageInput{
QueueUrl: rmin.QueueUrl,
ReceiptHandle: m.ReceiptHandle,
}
if _, err := client.DeleteMessage(dmi); err != nil {
log.Printf("ERROR dequeueing message ID %v : %v",
*m.ReceiptHandle,
err)
}
}(m)
}
// wait for all jobs from this batch...
wg.Wait()
}
}