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// build example
package main
import (
"bufio"
"context"
"errors"
"flag"
"fmt"
"log"
"os"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/sns"
)
var clientCfg ClientConfig
var topicARN string
func init() {
clientCfg.SetupFlags("", flag.CommandLine)
flag.CommandLine.StringVar(&topicARN, "topic", "",
"The topic `ARN` to send messages to")
}
func main() {
if err := flag.CommandLine.Parse(os.Args[1:]); err != nil {
flag.CommandLine.PrintDefaults()
exitErrorf(err, "failed to parse CLI commands")
}
if len(topicARN) == 0 {
flag.CommandLine.PrintDefaults()
exitErrorf(errors.New("topic ARN required"), "")
}
httpClient := NewClient(clientCfg)
sess, err := session.NewSession(&aws.Config{
HTTPClient: httpClient,
})
if err != nil {
exitErrorf(err, "failed to load config")
}
// Start making the requests.
svc := sns.New(sess)
ctx := context.Background()
fmt.Printf("Message: ")
// Scan messages from the input with newline separators.
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
trace, err := publishMessage(ctx, svc, topicARN, scanner.Text())
if err != nil {
fmt.Fprintf(os.Stderr, "failed to publish message, %v\n", err)
}
log.Println(trace)
fmt.Println()
fmt.Printf("Message: ")
}
if err := scanner.Err(); err != nil {
fmt.Fprintf(os.Stderr, "failed to read input, %v", err)
}
}
// publishMessage will send the message to the SNS topic returning an request
// trace for metrics.
func publishMessage(ctx context.Context, svc *sns.SNS, topic, msg string) (*RequestTrace, error) {
trace := &RequestTrace{}
_, err := svc.PublishWithContext(ctx, &sns.PublishInput{
TopicArn: &topic,
Message: &msg,
}, trace.TraceRequest)
if err != nil {
return trace, err
}
return trace, nil
}
func exitErrorf(err error, msg string, args ...interface{}) {
fmt.Fprintf(os.Stderr, "FAILED: %v\n"+msg+"\n", append([]interface{}{err}, args...)...)
os.Exit(1)
}
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