/
warm-backend-s3.go
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/
warm-backend-s3.go
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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"context"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"strings"
"github.com/minio/madmin-go/v3"
"github.com/minio/minio-go/v7"
"github.com/minio/minio-go/v7/pkg/credentials"
)
type warmBackendS3 struct {
client *minio.Client
core *minio.Core
Bucket string
Prefix string
StorageClass string
}
func (s3 *warmBackendS3) ToObjectError(err error, params ...string) error {
object := ""
if len(params) >= 1 {
object = params[0]
}
return ErrorRespToObjectError(err, s3.Bucket, s3.getDest(object))
}
func (s3 *warmBackendS3) getDest(object string) string {
destObj := object
if s3.Prefix != "" {
destObj = fmt.Sprintf("%s/%s", s3.Prefix, object)
}
return destObj
}
func (s3 *warmBackendS3) Put(ctx context.Context, object string, r io.Reader, length int64) (remoteVersionID, error) {
res, err := s3.client.PutObject(ctx, s3.Bucket, s3.getDest(object), r, length, minio.PutObjectOptions{
SendContentMd5: true,
StorageClass: s3.StorageClass,
})
return remoteVersionID(res.VersionID), s3.ToObjectError(err, object)
}
func (s3 *warmBackendS3) Get(ctx context.Context, object string, rv remoteVersionID, opts WarmBackendGetOpts) (io.ReadCloser, error) {
gopts := minio.GetObjectOptions{}
if rv != "" {
gopts.VersionID = string(rv)
}
if opts.startOffset >= 0 && opts.length > 0 {
if err := gopts.SetRange(opts.startOffset, opts.startOffset+opts.length-1); err != nil {
return nil, s3.ToObjectError(err, object)
}
}
c := &minio.Core{Client: s3.client}
// Important to use core primitives here to pass range get options as is.
r, _, _, err := c.GetObject(ctx, s3.Bucket, s3.getDest(object), gopts)
if err != nil {
return nil, s3.ToObjectError(err, object)
}
return r, nil
}
func (s3 *warmBackendS3) Remove(ctx context.Context, object string, rv remoteVersionID) error {
ropts := minio.RemoveObjectOptions{}
if rv != "" {
ropts.VersionID = string(rv)
}
err := s3.client.RemoveObject(ctx, s3.Bucket, s3.getDest(object), ropts)
return s3.ToObjectError(err, object)
}
func (s3 *warmBackendS3) InUse(ctx context.Context) (bool, error) {
result, err := s3.core.ListObjectsV2(s3.Bucket, s3.Prefix, "", "", slashSeparator, 1)
if err != nil {
return false, s3.ToObjectError(err)
}
return len(result.CommonPrefixes) > 0 || len(result.Contents) > 0, nil
}
func newWarmBackendS3(conf madmin.TierS3, tier string) (*warmBackendS3, error) {
u, err := url.Parse(conf.Endpoint)
if err != nil {
return nil, err
}
// Validation code
switch {
case conf.AWSRoleWebIdentityTokenFile == "" && conf.AWSRoleARN != "" || conf.AWSRoleWebIdentityTokenFile != "" && conf.AWSRoleARN == "":
return nil, errors.New("both the token file and the role ARN are required")
case conf.AccessKey == "" && conf.SecretKey != "" || conf.AccessKey != "" && conf.SecretKey == "":
return nil, errors.New("both the access and secret keys are required")
case conf.AWSRole && (conf.AWSRoleWebIdentityTokenFile != "" || conf.AWSRoleARN != "" || conf.AccessKey != "" || conf.SecretKey != ""):
return nil, errors.New("AWS Role cannot be activated with static credentials or the web identity token file")
case conf.Bucket == "":
return nil, errors.New("no bucket name was provided")
}
// Credentials initialization
var creds *credentials.Credentials
switch {
case conf.AWSRole:
creds = credentials.New(&credentials.IAM{
Client: &http.Client{
Transport: NewHTTPTransport(),
},
})
case conf.AWSRoleWebIdentityTokenFile != "" && conf.AWSRoleARN != "":
sessionName := conf.AWSRoleSessionName
if sessionName == "" {
// RoleSessionName has a limited set of characters (https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html)
sessionName = "minio-tier-" + mustGetUUID()
}
s3WebIdentityIAM := credentials.IAM{
Client: &http.Client{
Transport: NewHTTPTransport(),
},
EKSIdentity: struct {
TokenFile string
RoleARN string
RoleSessionName string
}{
conf.AWSRoleWebIdentityTokenFile,
conf.AWSRoleARN,
sessionName,
},
}
creds = credentials.New(&s3WebIdentityIAM)
case conf.AccessKey != "" && conf.SecretKey != "":
creds = credentials.NewStaticV4(conf.AccessKey, conf.SecretKey, "")
default:
return nil, errors.New("insufficient parameters for S3 backend authentication")
}
opts := &minio.Options{
Creds: creds,
Secure: u.Scheme == "https",
Transport: globalRemoteTargetTransport,
}
client, err := minio.New(u.Host, opts)
if err != nil {
return nil, err
}
client.SetAppInfo(fmt.Sprintf("s3-tier-%s", tier), ReleaseTag)
core := &minio.Core{Client: client}
return &warmBackendS3{
client: client,
core: core,
Bucket: conf.Bucket,
Prefix: strings.TrimSuffix(conf.Prefix, slashSeparator),
StorageClass: conf.StorageClass,
}, nil
}