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package s3
import (
"context"
"crypto/tls"
"fmt"
"io"
"net/http"
"net/url"
"os"
"time"
"github.com/minio/minio-go/v7"
"github.com/minio/minio-go/v7/pkg/credentials"
"github.com/lxc/incus/v6/internal/instancewriter"
"github.com/lxc/incus/v6/internal/server/backup"
"github.com/lxc/incus/v6/shared/logger"
"github.com/lxc/incus/v6/shared/validate"
)
// TransferManager represents a transfer manager.
type TransferManager struct {
s3URL *url.URL
accessKey string
secretKey string
}
// NewTransferManager instantiates a new TransferManager struct.
func NewTransferManager(s3URL *url.URL, accessKey string, secretKey string) TransferManager {
return TransferManager{
s3URL: s3URL,
accessKey: accessKey,
secretKey: secretKey,
}
}
// DownloadAllFiles downloads all files from a bucket and writes them to a tar writer.
func (t TransferManager) DownloadAllFiles(bucketName string, tarWriter *instancewriter.InstanceTarWriter) error {
logger.Debugf("Downloading all files from bucket %s", bucketName)
logger.Debugf("Endpoint: %s", t.getEndpoint())
minioClient, err := t.getMinioClient()
if err != nil {
return err
}
ctx, cancel := context.WithCancel(context.TODO())
defer cancel()
objectCh := minioClient.ListObjects(ctx, bucketName, minio.ListObjectsOptions{
Recursive: true,
})
for objectInfo := range objectCh {
if objectInfo.Err != nil {
logger.Errorf("Failed to get object info: %v", err)
return objectInfo.Err
}
object, err := minioClient.GetObject(ctx, bucketName, objectInfo.Key, minio.GetObjectOptions{})
if err != nil {
logger.Errorf("Failed to get object: %v", err)
return err
}
// Skip directories because they are part of the key of an actual file
if objectInfo.Key[len(objectInfo.Key)-1] == '/' {
continue
}
fi := instancewriter.FileInfo{
FileName: fmt.Sprintf("backup/bucket/%s", objectInfo.Key),
FileSize: objectInfo.Size,
FileMode: 0o600,
FileModTime: time.Now(),
}
logger.Debugf("Writing file %s to tar writer", objectInfo.Key)
logger.Debugf("File size: %d", objectInfo.Size)
err = tarWriter.WriteFileFromReader(object, &fi)
if err != nil {
logger.Errorf("Failed to write file to tar writer: %v", err)
return err
}
err = object.Close()
if err != nil {
logger.Errorf("Failed to close object: %v", err)
return err
}
}
return nil
}
// UploadAllFiles uploads all the provided files to the bucket.
func (t TransferManager) UploadAllFiles(bucketName string, srcData io.ReadSeeker) error {
logger.Debugf("Uploading all files to bucket %s", bucketName)
logger.Debugf("Endpoint: %s", t.getEndpoint())
minioClient, err := t.getMinioClient()
if err != nil {
return err
}
ctx, cancel := context.WithCancel(context.TODO())
defer cancel()
// Create temp path and remove it after wards
mountPath, err := os.MkdirTemp("", "incus_bucket_import_*")
if err != nil {
return err
}
defer func() { _ = os.RemoveAll(mountPath) }()
logger.Debugf("Created temp mount path %s", mountPath)
tr, cancelFunc, err := backup.TarReader(srcData, nil, mountPath)
if err != nil {
return err
}
defer cancelFunc()
for {
hdr, err := tr.Next()
if err == io.EOF {
break // End of archive.
}
// Skip index.yaml file
if hdr.Name == "backup/index.yaml" {
continue
}
// Skip directories because they are part of the key of an actual file
fileName := hdr.Name[len("backup/bucket/"):]
_, err = minioClient.PutObject(ctx, bucketName, fileName, tr, -1, minio.PutObjectOptions{})
if err != nil {
return err
}
}
return nil
}
func (t TransferManager) getMinioClient() (*minio.Client, error) {
bucketLookup := minio.BucketLookupPath
creds := credentials.NewStaticV4(t.accessKey, t.secretKey, "")
if t.isSecureEndpoint() {
return minio.New(t.getEndpoint(), &minio.Options{
BucketLookup: bucketLookup,
Creds: creds,
Secure: true,
Transport: getTransport(),
})
}
return minio.New(t.getEndpoint(), &minio.Options{
BucketLookup: bucketLookup,
Creds: creds,
Secure: false,
})
}
func (t TransferManager) getEndpoint() string {
hostname := t.s3URL.Hostname()
if validate.IsNetworkAddressV6(hostname) == nil {
hostname = fmt.Sprintf("[%s]", hostname)
}
return fmt.Sprintf("%s:%s", hostname, t.s3URL.Port())
}
func (t TransferManager) isSecureEndpoint() bool {
return t.s3URL.Scheme == "https"
}
func getTransport() *http.Transport {
return &http.Transport{
MaxIdleConns: 10,
IdleConnTimeout: 30 * time.Second,
DisableCompression: true,
TLSClientConfig: &tls.Config{
InsecureSkipVerify: true,
MinVersion: tls.VersionTLS12,
},
}
}
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