/
folder.go
265 lines (236 loc) · 7.84 KB
/
folder.go
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package s3
import (
"io"
"strconv"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3iface"
"github.com/pkg/errors"
"github.com/wal-g/storages/storage"
)
const (
NotFoundAWSErrorCode = "NotFound"
NoSuchKeyAWSErrorCode = "NoSuchKey"
EndpointSetting = "AWS_ENDPOINT"
RegionSetting = "AWS_REGION"
ForcePathStyleSetting = "AWS_S3_FORCE_PATH_STYLE"
AccessKeyIdSetting = "AWS_ACCESS_KEY_ID"
AccessKeySetting = "AWS_ACCESS_KEY"
SecretAccessKeySetting = "AWS_SECRET_ACCESS_KEY"
SecretKeySetting = "AWS_SECRET_KEY"
SessionTokenSetting = "AWS_SESSION_TOKEN"
SseSetting = "S3_SSE"
SseCSetting = "S3_SSE_C"
SseKmsIdSetting = "S3_SSE_KMS_ID"
StorageClassSetting = "S3_STORAGE_CLASS"
UploadConcurrencySetting = "UPLOAD_CONCURRENCY"
s3CertFile = "S3_CA_CERT_FILE"
MaxPartSize = "S3_MAX_PART_SIZE"
EndpointSourceSetting = "S3_ENDPOINT_SOURCE"
EndpointPortSetting = "S3_ENDPOINT_PORT"
LogLevel = "S3_LOG_LEVEL"
UseListObjectsV1 = "S3_USE_LIST_OBJECTS_V1"
)
var (
// MaxRetries limit upload and download retries during interaction with S3
MaxRetries = 1
SettingList = []string{
EndpointPortSetting,
EndpointSetting,
EndpointSourceSetting,
RegionSetting,
ForcePathStyleSetting,
AccessKeyIdSetting,
AccessKeySetting,
SecretAccessKeySetting,
SecretKeySetting,
SessionTokenSetting,
SseSetting,
SseKmsIdSetting,
StorageClassSetting,
UploadConcurrencySetting,
s3CertFile,
MaxPartSize,
UseListObjectsV1,
}
)
func getFirstSettingOf(settings map[string]string, keys []string) string {
for _, key := range keys {
if value, ok := settings[key]; ok {
return value
}
}
return ""
}
func NewFolderError(err error, format string, args ...interface{}) storage.Error {
return storage.NewError(err, "S3", format, args...)
}
func NewConfiguringError(settingName string) storage.Error {
return NewFolderError(errors.New("Configuring error"),
"%s setting is not set", settingName)
}
type Folder struct {
uploader Uploader
S3API s3iface.S3API
Bucket *string
Path string
settings map[string]string
useListObjectsV1 bool
}
func NewFolder(uploader Uploader, s3API s3iface.S3API, bucket, path string, useListObjectsV1 bool) *Folder {
return &Folder{
uploader: uploader,
S3API: s3API,
Bucket: aws.String(bucket),
Path: storage.AddDelimiterToPath(path),
useListObjectsV1: useListObjectsV1,
}
}
func ConfigureFolder(prefix string, settings map[string]string) (storage.Folder, error) {
bucket, path, err := storage.GetPathFromPrefix(prefix)
if err != nil {
return nil, errors.Wrap(err, "failed to configure S3 path")
}
sess, err := createSession(bucket, settings)
if err != nil {
return nil, errors.Wrap(err, "failed to create new session")
}
client := s3.New(sess)
uploader, err := configureUploader(client, settings)
if err != nil {
return nil, errors.Wrap(err, "failed to configure S3 uploader")
}
useListObjectsV1 := false
if strUseListObjectsV1, ok := settings[UseListObjectsV1]; ok {
useListObjectsV1, err = strconv.ParseBool(strUseListObjectsV1)
if err != nil {
return nil, NewFolderError(err, "Invalid s3 list objects version setting")
}
}
folder := NewFolder(*uploader, client, bucket, path, useListObjectsV1)
folder.settings = settings
return folder, nil
}
func (folder *Folder) Exists(objectRelativePath string) (bool, error) {
objectPath := folder.Path + objectRelativePath
stopSentinelObjectInput := &s3.HeadObjectInput{
Bucket: folder.Bucket,
Key: aws.String(objectPath),
}
_, err := folder.S3API.HeadObject(stopSentinelObjectInput)
if err != nil {
if isAwsNotExist(err) {
return false, nil
}
return false, errors.Wrapf(err, "failed to check s3 object '%s' existance", objectPath)
}
return true, nil
}
func (folder *Folder) PutObject(name string, content io.Reader) error {
return folder.uploader.upload(*folder.Bucket, folder.Path+name, content)
}
func (folder *Folder) ReadObject(objectRelativePath string) (io.ReadCloser, error) {
objectPath := folder.Path + objectRelativePath
input := &s3.GetObjectInput{
Bucket: folder.Bucket,
Key: aws.String(objectPath),
}
object, err := folder.S3API.GetObject(input)
if err != nil {
if isAwsNotExist(err) {
return nil, storage.NewObjectNotFoundError(objectPath)
}
return nil, errors.Wrapf(err, "failed to read object: '%s' from S3", objectPath)
}
return object.Body, nil
}
func (folder *Folder) GetSubFolder(subFolderRelativePath string) storage.Folder {
return NewFolder(folder.uploader, folder.S3API, *folder.Bucket,
storage.JoinPath(folder.Path, subFolderRelativePath)+"/", folder.useListObjectsV1)
}
func (folder *Folder) GetPath() string {
return folder.Path
}
func (folder *Folder) ListFolder() (objects []storage.Object, subFolders []storage.Folder, err error) {
listFunc := func(commonPrefixes []*s3.CommonPrefix, contents []*s3.Object) {
for _, prefix := range commonPrefixes {
subFolders = append(subFolders, NewFolder(folder.uploader, folder.S3API, *folder.Bucket,
*prefix.Prefix, folder.useListObjectsV1))
}
for _, object := range contents {
// Some storages return root tar_partitions folder as a Key.
// We do not want to fail restoration due to this fact.
// Keep in mind that skipping files is very dangerous and any decision here must be weighted.
if *object.Key == folder.Path {
continue
}
objectRelativePath := strings.TrimPrefix(*object.Key, folder.Path)
objects = append(objects, storage.NewLocalObject(objectRelativePath, *object.LastModified, *object.Size))
}
}
prefix := aws.String(folder.Path)
delimiter := aws.String("/")
if folder.useListObjectsV1 {
err = folder.listObjectsPagesV1(prefix, delimiter, listFunc)
} else {
err = folder.listObjectsPagesV2(prefix, delimiter, listFunc)
}
if err != nil {
return nil, nil, errors.Wrapf(err, "failed to list s3 folder: '%s'", folder.Path)
}
return objects, subFolders, nil
}
func (folder *Folder) listObjectsPagesV1(prefix *string, delimiter *string,
listFunc func(commonPrefixes []*s3.CommonPrefix, contents []*s3.Object)) error {
s3Objects := &s3.ListObjectsInput{
Bucket: folder.Bucket,
Prefix: prefix,
Delimiter: delimiter,
}
return folder.S3API.ListObjectsPages(s3Objects, func(files *s3.ListObjectsOutput, lastPage bool) bool {
listFunc(files.CommonPrefixes, files.Contents)
return true
})
}
func (folder *Folder) listObjectsPagesV2(prefix *string, delimiter *string,
listFunc func(commonPrefixes []*s3.CommonPrefix, contents []*s3.Object)) error {
s3Objects := &s3.ListObjectsV2Input{
Bucket: folder.Bucket,
Prefix: prefix,
Delimiter: delimiter,
}
return folder.S3API.ListObjectsV2Pages(s3Objects, func(files *s3.ListObjectsV2Output, lastPage bool) bool {
listFunc(files.CommonPrefixes, files.Contents)
return true
})
}
func (folder *Folder) DeleteObjects(objectRelativePaths []string) error {
parts := partitionStrings(objectRelativePaths, 1000)
for _, part := range parts {
input := &s3.DeleteObjectsInput{Bucket: folder.Bucket, Delete: &s3.Delete{
Objects: folder.partitionToObjects(part),
}}
_, err := folder.S3API.DeleteObjects(input)
if err != nil {
return errors.Wrapf(err, "failed to delete s3 object: '%s'", part)
}
}
return nil
}
func (folder *Folder) partitionToObjects(keys []string) []*s3.ObjectIdentifier {
objects := make([]*s3.ObjectIdentifier, len(keys))
for id, key := range keys {
objects[id] = &s3.ObjectIdentifier{Key: aws.String(folder.Path + key)}
}
return objects
}
func isAwsNotExist(err error) bool {
if awsErr, ok := err.(awserr.Error); ok {
if awsErr.Code() == NotFoundAWSErrorCode || awsErr.Code() == NoSuchKeyAWSErrorCode {
return true
}
}
return false
}