minio/cmd/bucket-replication.go
poornas 79e21601b0
fix: web handlers to enforce replication (#10249)
This PR also preserves source ETag for replication
2020-08-12 17:32:24 -07:00

261 lines
8.4 KiB
Go

/*
* MinIO Cloud Storage, (C) 2020 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"context"
"net/http"
"strings"
"time"
miniogo "github.com/minio/minio-go/v7"
"github.com/minio/minio-go/v7/pkg/encrypt"
"github.com/minio/minio-go/v7/pkg/tags"
"github.com/minio/minio/cmd/crypto"
xhttp "github.com/minio/minio/cmd/http"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/bucket/replication"
"github.com/minio/minio/pkg/event"
iampolicy "github.com/minio/minio/pkg/iam/policy"
)
// gets replication config associated to a given bucket name.
func getReplicationConfig(ctx context.Context, bucketName string) (rc *replication.Config, err error) {
if globalIsGateway {
objAPI := newObjectLayerWithoutSafeModeFn()
if objAPI == nil {
return nil, errServerNotInitialized
}
return nil, BucketReplicationConfigNotFound{Bucket: bucketName}
}
return globalBucketMetadataSys.GetReplicationConfig(ctx, bucketName)
}
// validateReplicationDestination returns error if replication destination bucket missing or not configured
// It also returns true if replication destination is same as this server.
func validateReplicationDestination(ctx context.Context, bucket string, rCfg *replication.Config) (bool, error) {
clnt := globalBucketTargetSys.GetReplicationTargetClient(ctx, rCfg.RoleArn)
if clnt == nil {
return false, BucketRemoteTargetNotFound{Bucket: bucket}
}
if found, _ := clnt.BucketExists(ctx, rCfg.GetDestination().Bucket); !found {
return false, BucketReplicationDestinationNotFound{Bucket: rCfg.GetDestination().Bucket}
}
if ret, err := globalBucketObjectLockSys.Get(bucket); err == nil {
if ret.LockEnabled {
lock, _, _, _, err := clnt.GetObjectLockConfig(ctx, rCfg.GetDestination().Bucket)
if err != nil || lock != "Enabled" {
return false, BucketReplicationDestinationMissingLock{Bucket: rCfg.GetDestination().Bucket}
}
}
}
// validate replication ARN against target endpoint
c, ok := globalBucketTargetSys.arnRemotesMap[rCfg.RoleArn]
if ok {
if c.EndpointURL().String() == clnt.EndpointURL().String() {
sameTarget, _ := isLocalHost(clnt.EndpointURL().Hostname(), clnt.EndpointURL().Port(), globalMinioPort)
return sameTarget, nil
}
}
return false, BucketRemoteTargetNotFound{Bucket: bucket}
}
func mustReplicateWeb(ctx context.Context, r *http.Request, bucket, object string, meta map[string]string, replStatus string, permErr APIErrorCode) bool {
if permErr != ErrNone {
return false
}
return mustReplicater(ctx, r, bucket, object, meta, replStatus)
}
// mustReplicate returns true if object meets replication criteria.
func mustReplicate(ctx context.Context, r *http.Request, bucket, object string, meta map[string]string, replStatus string) bool {
if s3Err := isPutActionAllowed(getRequestAuthType(r), bucket, object, r, iampolicy.GetReplicationConfigurationAction); s3Err != ErrNone {
return false
}
return mustReplicater(ctx, r, bucket, object, meta, replStatus)
}
// mustReplicater returns true if object meets replication criteria.
func mustReplicater(ctx context.Context, r *http.Request, bucket, object string, meta map[string]string, replStatus string) bool {
if globalIsGateway {
return false
}
if rs, ok := meta[xhttp.AmzBucketReplicationStatus]; ok {
replStatus = rs
}
if replication.StatusType(replStatus) == replication.Replica {
return false
}
cfg, err := getReplicationConfig(ctx, bucket)
if err != nil {
return false
}
opts := replication.ObjectOpts{
Name: object,
SSEC: crypto.SSEC.IsEncrypted(meta),
}
tagStr, ok := meta[xhttp.AmzObjectTagging]
if ok {
opts.UserTags = tagStr
}
return cfg.Replicate(opts)
}
func putReplicationOpts(dest replication.Destination, objInfo ObjectInfo) (putOpts miniogo.PutObjectOptions) {
meta := make(map[string]string)
for k, v := range objInfo.UserDefined {
if k == xhttp.AmzBucketReplicationStatus {
continue
}
if strings.HasPrefix(strings.ToLower(k), ReservedMetadataPrefixLower) {
continue
}
meta[k] = v
}
tag, err := tags.ParseObjectTags(objInfo.UserTags)
if err != nil {
return
}
sc := dest.StorageClass
if sc == "" {
sc = objInfo.StorageClass
}
putOpts = miniogo.PutObjectOptions{
UserMetadata: meta,
UserTags: tag.ToMap(),
ContentType: objInfo.ContentType,
ContentEncoding: objInfo.ContentEncoding,
StorageClass: sc,
ReplicationVersionID: objInfo.VersionID,
ReplicationStatus: miniogo.ReplicationStatusReplica,
ReplicationMTime: objInfo.ModTime,
ReplicationETag: objInfo.ETag,
}
if mode, ok := objInfo.UserDefined[xhttp.AmzObjectLockMode]; ok {
rmode := miniogo.RetentionMode(mode)
putOpts.Mode = rmode
}
if retainDateStr, ok := objInfo.UserDefined[xhttp.AmzObjectLockRetainUntilDate]; ok {
rdate, err := time.Parse(time.RFC3339, retainDateStr)
if err != nil {
return
}
putOpts.RetainUntilDate = rdate
}
if lhold, ok := objInfo.UserDefined[xhttp.AmzObjectLockLegalHold]; ok {
putOpts.LegalHold = miniogo.LegalHoldStatus(lhold)
}
if crypto.S3.IsEncrypted(objInfo.UserDefined) {
putOpts.ServerSideEncryption = encrypt.NewSSE()
}
return
}
// replicateObject replicates the specified version of the object to destination bucket
// The source object is then updated to reflect the replication status.
func replicateObject(ctx context.Context, bucket, object, versionID string, objectAPI ObjectLayer, eventArg *eventArgs, healPending bool) {
cfg, err := getReplicationConfig(ctx, bucket)
if err != nil {
logger.LogIf(ctx, err)
return
}
tgt := globalBucketTargetSys.GetReplicationTargetClient(ctx, cfg.RoleArn)
if tgt == nil {
return
}
gr, err := objectAPI.GetObjectNInfo(ctx, bucket, object, nil, http.Header{}, readLock, ObjectOptions{})
if err != nil {
return
}
defer gr.Close()
objInfo := gr.ObjInfo
size, err := objInfo.GetActualSize()
if err != nil {
logger.LogIf(ctx, err)
return
}
dest := cfg.GetDestination()
if dest.Bucket == "" {
return
}
// In the rare event that replication is in pending state either due to
// server shut down/crash before replication completed or healing and PutObject
// race - do an additional stat to see if the version ID exists
if healPending {
_, err := tgt.StatObject(ctx, dest.Bucket, object, miniogo.StatObjectOptions{VersionID: objInfo.VersionID})
if err == nil {
// object with same VersionID already exists, replication kicked off by
// PutObject might have completed.
return
}
}
putOpts := putReplicationOpts(dest, objInfo)
replicationStatus := replication.Complete
_, err = tgt.PutObject(ctx, dest.Bucket, object, gr, size, "", "", putOpts)
if err != nil {
replicationStatus = replication.Failed
// Notify replication failure event.
if eventArg == nil {
eventArg = &eventArgs{
BucketName: bucket,
Object: objInfo,
Host: "Internal: [Replication]",
}
}
eventArg.EventName = event.OperationReplicationFailed
eventArg.Object.UserDefined[xhttp.AmzBucketReplicationStatus] = replicationStatus.String()
sendEvent(*eventArg)
}
objInfo.UserDefined[xhttp.AmzBucketReplicationStatus] = replicationStatus.String()
if objInfo.UserTags != "" {
objInfo.UserDefined[xhttp.AmzObjectTagging] = objInfo.UserTags
}
objInfo.metadataOnly = true // Perform only metadata updates.
if _, err = objectAPI.CopyObject(ctx, bucket, object, bucket, object, objInfo, ObjectOptions{
VersionID: objInfo.VersionID,
}, ObjectOptions{VersionID: objInfo.VersionID}); err != nil {
logger.LogIf(ctx, err)
}
}
// filterReplicationStatusMetadata filters replication status metadata for COPY
func filterReplicationStatusMetadata(metadata map[string]string) map[string]string {
// Copy on write
dst := metadata
var copied bool
delKey := func(key string) {
if _, ok := metadata[key]; !ok {
return
}
if !copied {
dst = make(map[string]string, len(metadata))
for k, v := range metadata {
dst[k] = v
}
copied = true
}
delete(dst, key)
}
delKey(xhttp.AmzBucketReplicationStatus)
return dst
}