/
s3sync.go
144 lines (115 loc) · 2.94 KB
/
s3sync.go
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package main
import (
"fmt"
"log"
"net/url"
"os"
"path"
"strings"
"sync"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
)
const (
concurrency = 10
awsRegion = "us-east-1"
)
var objectsCount = 0
func worker(id int, jobs <-chan *s3.Object, downloader *s3manager.Downloader, awsBucket string, destDir string) {
for object := range jobs {
os.MkdirAll(path.Dir(path.Join(destDir, *object.Key)), 0777)
file, err := os.Create(path.Join(destDir, *object.Key))
if err != nil {
log.Fatal("Failed to create file", err)
}
defer file.Close()
numBytes, err := downloader.Download(file,
&s3.GetObjectInput{
Bucket: aws.String(awsBucket),
Key: object.Key,
})
file.Close()
if err != nil {
fmt.Println("Failed to download file", err)
return
}
fmt.Println("worker", id, "downloaded", file.Name(), numBytes, "bytes", objectsCount)
}
}
func workerBucket(id int, jobs <-chan *s3.Object, svc *s3.S3, awsBucket, destBucket, destPrefix string) {
for object := range jobs {
fmt.Println("Copy", path.Join(awsBucket, *object.Key), destBucket, path.Join(destPrefix, *object.Key))
_, err := svc.CopyObject(&s3.CopyObjectInput{
Bucket: aws.String(destBucket),
CopySource: aws.String(path.Join(awsBucket, *object.Key)),
Key: aws.String(path.Join(destPrefix, *object.Key)),
})
if err != nil {
fmt.Println("Failed to copy file", err)
return
}
}
}
func main() {
jobs := make(chan *s3.Object)
s3Url := os.Args[1]
dest := os.Args[2]
u, err := url.Parse(s3Url)
if err != nil {
log.Fatal(err)
}
s3Bucket := u.Host
s3Prefix := u.Path[1:]
session := session.New(&aws.Config{Region: aws.String(awsRegion)})
svc := s3.New(session)
params := &s3.ListObjectsInput{
Bucket: aws.String(s3Bucket),
Prefix: aws.String(s3Prefix),
}
var wg sync.WaitGroup
if strings.HasPrefix(dest, "s3://") {
fmt.Println(dest)
u, err = url.Parse(dest)
if err != nil {
log.Fatal(err)
}
destBucket := u.Host
destPrefix := u.Path[1:]
for w := 1; w <= concurrency; w++ {
wg.Add(1)
go func(w int) {
workerBucket(w, jobs, svc, s3Bucket, destBucket, destPrefix)
defer wg.Done()
}(w)
}
} else {
err = os.MkdirAll(dest, 0700)
if err != nil {
log.Fatal(err)
}
downloader := s3manager.NewDownloader(session)
for w := 1; w <= concurrency; w++ {
wg.Add(1)
go func(w int) {
worker(w, jobs, downloader, s3Bucket, dest)
defer wg.Done()
}(w)
}
}
log.Printf("Looking for objects in bucket: %s, prefix: %s", s3Bucket, s3Prefix)
err = svc.ListObjectsPages(params, func(page *s3.ListObjectsOutput, lastPage bool) bool {
for _, object := range page.Contents {
jobs <- object
}
objectsCount += len(page.Contents)
return true
})
close(jobs)
wg.Wait()
if err != nil {
log.Fatal(err)
}
fmt.Printf("Found %d objects to download.\n", objectsCount)
}