package main
import (
"context"
"log"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/service/ec2"
"github.com/aws/aws-sdk-go-v2/service/s3"
"github.com/aws/aws-sdk-go-v2/service/dynamodb"
)
func main() {
// Load AWS configuration
cfg, err := config.LoadDefaultConfig(context.TODO())
if err != nil {
log.Fatal(err)
}
// Example 1: Basic S3 paginator pattern
s3Client := s3.NewFromConfig(cfg)
paginator := s3.NewListObjectsV2Paginator(s3Client, &s3.ListObjectsV2Input{
Bucket: aws.String("my-test-bucket"),
Prefix: aws.String("logs/"),
})
for paginator.HasMorePages() {
page, err := paginator.NextPage(context.TODO())
if err != nil {
log.Printf("S3 ListObjectsV2 error: %v", err)
break
}
log.Printf("Found %d objects in page", len(page.Contents))
}
// Example 2: EC2 paginator pattern
ec2Client := ec2.NewFromConfig(cfg)
instancePaginator := ec2.NewDescribeInstancesPaginator(ec2Client, &ec2.DescribeInstancesInput{
MaxResults: aws.Int32(10),
})
for instancePaginator.HasMorePages() {
page, err := instancePaginator.NextPage(context.TODO())
if err != nil {
log.Printf("EC2 DescribeInstances error: %v", err)
break
}
log.Printf("Found %d reservations in page", len(page.Reservations))
}
// Example 3: DynamoDB paginator pattern
dynamoClient := dynamodb.NewFromConfig(cfg)
scanPaginator := dynamodb.NewScanPaginator(dynamoClient, &dynamodb.ScanInput{
TableName: aws.String("my-table"),
})
for scanPaginator.HasMorePages() {
page, err := scanPaginator.NextPage(context.TODO())
if err != nil {
log.Printf("DynamoDB Scan error: %v", err)
break
}
log.Printf("Found %d items in page", len(page.Items))
}
// Example 4: Chained paginator call
page, err := s3.NewListObjectsV2Paginator(s3Client, &s3.ListObjectsV2Input{
Bucket: aws.String("another-bucket"),
Prefix: aws.String("data/"),
}).NextPage(context.TODO())
if err != nil {
log.Printf("Chained paginator error: %v", err)
} else {
log.Printf("Chained call found %d objects", len(page.Contents))
}
// Example 5: Multiple NextPage calls on same paginator
multiPaginator := s3.NewListObjectsV2Paginator(s3Client, &s3.ListObjectsV2Input{
Bucket: aws.String("multi-page-bucket"),
})
// First page
page1, err := multiPaginator.NextPage(context.TODO())
if err != nil {
log.Printf("First page error: %v", err)
} else {
log.Printf("First page: %d objects", len(page1.Contents))
}
// Second page
page2, err := multiPaginator.NextPage(context.TODO())
if err != nil {
log.Printf("Second page error: %v", err)
} else {
log.Printf("Second page: %d objects", len(page2.Contents))
}
// Example 6: Unmatched paginator (created but not used)
unusedPaginator := ec2.NewDescribeInstancesPaginator(ec2Client, &ec2.DescribeInstancesInput{})
_ = unusedPaginator // This should still generate a synthetic call
}
