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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"
"fmt"
"net/url"
"sync"
"time"
jsoniter "github.com/json-iterator/go"
"github.com/minio/madmin-go/v2"
"github.com/minio/minio-go/v7"
"github.com/minio/minio-go/v7/pkg/credentials"
"github.com/minio/minio/internal/bucket/replication"
"github.com/minio/minio/internal/crypto"
"github.com/minio/minio/internal/kms"
"github.com/minio/minio/internal/logger"
)
const (
defaultHealthCheckDuration = 5 * time.Second
// default interval for reload of all remote target endpoints
defaultHealthCheckReloadDuration = 30 * time.Minute
)
// BucketTargetSys represents bucket targets subsystem
type BucketTargetSys struct {
sync.RWMutex
arnRemotesMap map[string]*TargetClient
targetsMap map[string][]madmin.BucketTarget
hMutex sync.RWMutex
hc map[string]epHealth
hcClient *madmin.AnonymousClient
}
// epHealth struct represents health of a replication target endpoint.
type epHealth struct {
Endpoint string
Scheme string
Online bool
}
// isOffline returns current liveness result of remote target. Add endpoint to
// healthcheck map if missing and default to online status
func (sys *BucketTargetSys) isOffline(ep *url.URL) bool {
sys.hMutex.RLock()
defer sys.hMutex.RUnlock()
if h, ok := sys.hc[ep.Host]; ok {
return !h.Online
}
go sys.initHC(ep)
return false
}
func (sys *BucketTargetSys) initHC(ep *url.URL) {
sys.hMutex.Lock()
sys.hc[ep.Host] = epHealth{
Endpoint: ep.Host,
Scheme: ep.Scheme,
Online: true,
}
sys.hMutex.Unlock()
}
// newHCClient initializes an anonymous client for performing health check on the remote endpoints
func newHCClient() *madmin.AnonymousClient {
clnt, e := madmin.NewAnonymousClientNoEndpoint()
if e != nil {
logger.LogOnceIf(GlobalContext, fmt.Errorf("WARNING: Unable to initialize health check client"), string(replicationSubsystem))
return nil
}
clnt.SetCustomTransport(globalRemoteTargetTransport)
return clnt
}
// heartBeat performs liveness check on remote endpoints.
func (sys *BucketTargetSys) heartBeat(ctx context.Context) {
hcTimer := time.NewTimer(defaultHealthCheckDuration)
defer hcTimer.Stop()
for {
select {
case <-hcTimer.C:
sys.hMutex.RLock()
eps := make([]madmin.ServerProperties, 0, len(sys.hc))
for _, ep := range sys.hc {
eps = append(eps, madmin.ServerProperties{Endpoint: ep.Endpoint, Scheme: ep.Scheme})
}
sys.hMutex.RUnlock()
if len(eps) > 0 {
cctx, cancel := context.WithTimeout(ctx, 30*time.Second)
m := make(map[string]epHealth, len(eps))
for result := range sys.hcClient.Alive(cctx, madmin.AliveOpts{}, eps...) {
m[result.Endpoint.Host] = epHealth{
Endpoint: result.Endpoint.Host,
Scheme: result.Endpoint.Scheme,
Online: result.Online,
}
}
cancel()
sys.hMutex.Lock()
sys.hc = m
sys.hMutex.Unlock()
}
hcTimer.Reset(defaultHealthCheckDuration)
case <-ctx.Done():
return
}
}
}
// periodically rebuild the healthcheck map from list of targets to clear
// out stale endpoints
func (sys *BucketTargetSys) reloadHealthCheckers(ctx context.Context) {
m := make(map[string]epHealth)
tgts := sys.ListTargets(ctx, "", "")
for _, t := range tgts {
if _, ok := m[t.Endpoint]; !ok {
scheme := "http"
if t.Secure {
scheme = "https"
}
m[t.Endpoint] = epHealth{
Online: true,
Endpoint: t.Endpoint,
Scheme: scheme,
}
}
}
sys.hMutex.Lock()
// swap out the map
sys.hc = m
sys.hMutex.Unlock()
}
// ListTargets lists bucket targets across tenant or for individual bucket, and returns
// results filtered by arnType
func (sys *BucketTargetSys) ListTargets(ctx context.Context, bucket, arnType string) (targets []madmin.BucketTarget) {
if bucket != "" {
if ts, err := sys.ListBucketTargets(ctx, bucket); err == nil {
for _, t := range ts.Targets {
if string(t.Type) == arnType || arnType == "" {
targets = append(targets, t.Clone())
}
}
}
return targets
}
sys.RLock()
defer sys.RUnlock()
for _, tgts := range sys.targetsMap {
for _, t := range tgts {
if string(t.Type) == arnType || arnType == "" {
targets = append(targets, t.Clone())
}
}
}
return
}
// ListBucketTargets - gets list of bucket targets for this bucket.
func (sys *BucketTargetSys) ListBucketTargets(ctx context.Context, bucket string) (*madmin.BucketTargets, error) {
sys.RLock()
defer sys.RUnlock()
tgts, ok := sys.targetsMap[bucket]
if ok {
return &madmin.BucketTargets{Targets: tgts}, nil
}
return nil, BucketRemoteTargetNotFound{Bucket: bucket}
}
// Delete clears targets present for a bucket
func (sys *BucketTargetSys) Delete(bucket string) {
sys.Lock()
defer sys.Unlock()
tgts, ok := sys.targetsMap[bucket]
if !ok {
return
}
for _, t := range tgts {
delete(sys.arnRemotesMap, t.Arn)
}
delete(sys.targetsMap, bucket)
}
// SetTarget - sets a new minio-go client target for this bucket.
func (sys *BucketTargetSys) SetTarget(ctx context.Context, bucket string, tgt *madmin.BucketTarget, update bool) error {
if !tgt.Type.IsValid() && !update {
return BucketRemoteArnTypeInvalid{Bucket: bucket}
}
clnt, err := sys.getRemoteTargetClient(tgt)
if err != nil {
return BucketRemoteTargetNotFound{Bucket: tgt.TargetBucket}
}
// validate if target credentials are ok
exists, err := clnt.BucketExists(ctx, tgt.TargetBucket)
if err != nil {
switch minio.ToErrorResponse(err).Code {
case "NoSuchBucket":
return BucketRemoteTargetNotFound{Bucket: tgt.TargetBucket}
case "AccessDenied":
return RemoteTargetConnectionErr{Bucket: tgt.TargetBucket, AccessKey: tgt.Credentials.AccessKey, Err: err}
}
return RemoteTargetConnectionErr{Bucket: tgt.TargetBucket, AccessKey: tgt.Credentials.AccessKey, Err: err}
}
if !exists {
return BucketRemoteTargetNotFound{Bucket: tgt.TargetBucket}
}
if tgt.Type == madmin.ReplicationService {
if !globalBucketVersioningSys.Enabled(bucket) {
return BucketReplicationSourceNotVersioned{Bucket: bucket}
}
vcfg, err := clnt.GetBucketVersioning(ctx, tgt.TargetBucket)
if err != nil {
return RemoteTargetConnectionErr{Bucket: tgt.TargetBucket, Err: err, AccessKey: tgt.Credentials.AccessKey}
}
if !vcfg.Enabled() {
return BucketRemoteTargetNotVersioned{Bucket: tgt.TargetBucket}
}
}
sys.Lock()
defer sys.Unlock()
tgts := sys.targetsMap[bucket]
newtgts := make([]madmin.BucketTarget, len(tgts))
found := false
for idx, t := range tgts {
if t.Type == tgt.Type {
if t.Arn == tgt.Arn {
if !update {
return BucketRemoteAlreadyExists{Bucket: t.TargetBucket}
}
newtgts[idx] = *tgt
found = true
continue
}
// fail if endpoint is already present in list of targets and not a matching ARN
if t.Endpoint == tgt.Endpoint {
return BucketRemoteAlreadyExists{Bucket: t.TargetBucket}
}
}
newtgts[idx] = t
}
if !found && !update {
newtgts = append(newtgts, *tgt)
}
sys.targetsMap[bucket] = newtgts
sys.arnRemotesMap[tgt.Arn] = clnt
sys.updateBandwidthLimit(bucket, tgt.Arn, tgt.BandwidthLimit)
return nil
}
func (sys *BucketTargetSys) updateBandwidthLimit(bucket, arn string, limit int64) {
if limit == 0 {
globalBucketMonitor.DeleteBucketThrottle(bucket, arn)
return
}
// Setup bandwidth throttling
globalBucketMonitor.SetBandwidthLimit(bucket, arn, limit)
}
// RemoveTarget - removes a remote bucket target for this source bucket.
func (sys *BucketTargetSys) RemoveTarget(ctx context.Context, bucket, arnStr string) error {
if arnStr == "" {
return BucketRemoteArnInvalid{Bucket: bucket}
}
arn, err := madmin.ParseARN(arnStr)
if err != nil {
return BucketRemoteArnInvalid{Bucket: bucket}
}
if arn.Type == madmin.ReplicationService {
// reject removal of remote target if replication configuration is present
rcfg, err := getReplicationConfig(ctx, bucket)
if err == nil {
for _, tgtArn := range rcfg.FilterTargetArns(replication.ObjectOpts{OpType: replication.AllReplicationType}) {
if err == nil && (tgtArn == arnStr || rcfg.RoleArn == arnStr) {
sys.RLock()
_, ok := sys.arnRemotesMap[arnStr]
sys.RUnlock()
if ok {
return BucketRemoteRemoveDisallowed{Bucket: bucket}
}
}
}
}
}
// delete ARN type from list of matching targets
sys.Lock()
defer sys.Unlock()
found := false
tgts, ok := sys.targetsMap[bucket]
if !ok {
return BucketRemoteTargetNotFound{Bucket: bucket}
}
targets := make([]madmin.BucketTarget, 0, len(tgts))
for _, tgt := range tgts {
if tgt.Arn != arnStr {
targets = append(targets, tgt)
continue
}
found = true
}
if !found {
return BucketRemoteTargetNotFound{Bucket: bucket}
}
sys.targetsMap[bucket] = targets
delete(sys.arnRemotesMap, arnStr)
sys.updateBandwidthLimit(bucket, arnStr, 0)
return nil
}
// GetRemoteTargetClient returns minio-go client for replication target instance
func (sys *BucketTargetSys) GetRemoteTargetClient(ctx context.Context, arn string) *TargetClient {
sys.RLock()
defer sys.RUnlock()
return sys.arnRemotesMap[arn]
}
// GetRemoteBucketTargetByArn returns BucketTarget for a ARN
func (sys *BucketTargetSys) GetRemoteBucketTargetByArn(ctx context.Context, bucket, arn string) madmin.BucketTarget {
sys.RLock()
defer sys.RUnlock()
var tgt madmin.BucketTarget
for _, t := range sys.targetsMap[bucket] {
if t.Arn == arn {
tgt = t.Clone()
tgt.Credentials = t.Credentials
return tgt
}
}
return tgt
}
// NewBucketTargetSys - creates new replication system.
func NewBucketTargetSys(ctx context.Context) *BucketTargetSys {
sys := &BucketTargetSys{
arnRemotesMap: make(map[string]*TargetClient),
targetsMap: make(map[string][]madmin.BucketTarget),
hc: make(map[string]epHealth),
hcClient: newHCClient(),
}
// reload healthcheck endpoints map periodically to remove stale endpoints from the map.
go func() {
rTimer := time.NewTimer(defaultHealthCheckReloadDuration)
defer rTimer.Stop()
for {
select {
case <-rTimer.C:
sys.reloadHealthCheckers(ctx)
rTimer.Reset(defaultHealthCheckReloadDuration)
case <-ctx.Done():
return
}
}
}()
go sys.heartBeat(ctx)
return sys
}
// UpdateAllTargets updates target to reflect metadata updates
func (sys *BucketTargetSys) UpdateAllTargets(bucket string, tgts *madmin.BucketTargets) {
if sys == nil {
return
}
sys.Lock()
defer sys.Unlock()
// Remove existingtarget and arn association
if tgts, ok := sys.targetsMap[bucket]; ok {
for _, t := range tgts {
delete(sys.arnRemotesMap, t.Arn)
}
delete(sys.targetsMap, bucket)
}
// No need for more if not adding anything
if tgts == nil || tgts.Empty() {
globalBucketMonitor.DeleteBucket(bucket)
return
}
if len(tgts.Targets) > 0 {
sys.targetsMap[bucket] = tgts.Targets
}
for _, tgt := range tgts.Targets {
tgtClient, err := sys.getRemoteTargetClient(&tgt)
if err != nil {
continue
}
sys.arnRemotesMap[tgt.Arn] = tgtClient
sys.updateBandwidthLimit(bucket, tgt.Arn, tgt.BandwidthLimit)
}
sys.targetsMap[bucket] = tgts.Targets
}
// create minio-go clients for buckets having remote targets
func (sys *BucketTargetSys) set(bucket BucketInfo, meta BucketMetadata) {
cfg := meta.bucketTargetConfig
if cfg == nil || cfg.Empty() {
return
}
sys.Lock()
defer sys.Unlock()
if len(cfg.Targets) > 0 {
sys.targetsMap[bucket.Name] = cfg.Targets
}
for _, tgt := range cfg.Targets {
tgtClient, err := sys.getRemoteTargetClient(&tgt)
if err != nil {
logger.LogIf(GlobalContext, err)
continue
}
sys.arnRemotesMap[tgt.Arn] = tgtClient
sys.updateBandwidthLimit(bucket.Name, tgt.Arn, tgt.BandwidthLimit)
}
sys.targetsMap[bucket.Name] = cfg.Targets
}
// Returns a minio-go Client configured to access remote host described in replication target config.
func (sys *BucketTargetSys) getRemoteTargetClient(tcfg *madmin.BucketTarget) (*TargetClient, error) {
config := tcfg.Credentials
creds := credentials.NewStaticV4(config.AccessKey, config.SecretKey, "")
api, err := minio.New(tcfg.Endpoint, &minio.Options{
Creds: creds,
Secure: tcfg.Secure,
Region: tcfg.Region,
Transport: globalRemoteTargetTransport,
})
if err != nil {
return nil, err
}
api.SetAppInfo("minio-replication-target", ReleaseTag+" "+tcfg.Arn)
hcDuration := defaultHealthCheckDuration
if tcfg.HealthCheckDuration >= 1 { // require minimum health check duration of 1 sec.
hcDuration = tcfg.HealthCheckDuration
}
tc := &TargetClient{
Client: api,
healthCheckDuration: hcDuration,
replicateSync: tcfg.ReplicationSync,
Bucket: tcfg.TargetBucket,
StorageClass: tcfg.StorageClass,
disableProxy: tcfg.DisableProxy,
ARN: tcfg.Arn,
ResetID: tcfg.ResetID,
Endpoint: tcfg.Endpoint,
Secure: tcfg.Secure,
}
return tc, nil
}
// getRemoteARN gets existing ARN for an endpoint or generates a new one.
func (sys *BucketTargetSys) getRemoteARN(bucket string, target *madmin.BucketTarget, deplID string) (arn string, exists bool) {
if target == nil {
return
}
tgts := sys.targetsMap[bucket]
for _, tgt := range tgts {
if tgt.Type == target.Type &&
tgt.TargetBucket == target.TargetBucket &&
target.URL().String() == tgt.URL().String() &&
tgt.Credentials.AccessKey == target.Credentials.AccessKey {
return tgt.Arn, true
}
}
if !target.Type.IsValid() {
return
}
return generateARN(target, deplID), false
}
// getRemoteARNForPeer returns the remote target for a peer site in site replication
func (sys *BucketTargetSys) getRemoteARNForPeer(bucket string, peer madmin.PeerInfo) string {
tgts := sys.targetsMap[bucket]
for _, target := range tgts {
ep, _ := url.Parse(peer.Endpoint)
if target.SourceBucket == bucket &&
target.TargetBucket == bucket &&
target.Endpoint == ep.Host &&
target.Secure == (ep.Scheme == "https") &&
target.Type == madmin.ReplicationService {
return target.Arn
}
}
return ""
}
// generate ARN that is unique to this target type
func generateARN(t *madmin.BucketTarget, deplID string) string {
uuid := deplID
if uuid == "" {
uuid = mustGetUUID()
}
arn := madmin.ARN{
Type: t.Type,
ID: uuid,
Region: t.Region,
Bucket: t.TargetBucket,
}
return arn.String()
}
// Returns parsed target config. If KMS is configured, remote target is decrypted
func parseBucketTargetConfig(bucket string, cdata, cmetadata []byte) (*madmin.BucketTargets, error) {
var (
data []byte
err error
t madmin.BucketTargets
meta map[string]string
)
if len(cdata) == 0 {
return nil, nil
}
data = cdata
json := jsoniter.ConfigCompatibleWithStandardLibrary
if len(cmetadata) != 0 {
if err := json.Unmarshal(cmetadata, &meta); err != nil {
return nil, err
}
if crypto.S3.IsEncrypted(meta) {
if data, err = decryptBucketMetadata(cdata, bucket, meta, kms.Context{
bucket: bucket,
bucketTargetsFile: bucketTargetsFile,
}); err != nil {
return nil, err
}
}
}
if err = json.Unmarshal(data, &t); err != nil {
return nil, err
}
return &t, nil
}
// TargetClient is the struct for remote target client.
type TargetClient struct {
*minio.Client
healthCheckDuration time.Duration
Bucket string // remote bucket target
replicateSync bool
StorageClass string // storage class on remote
disableProxy bool
ARN string // ARN to uniquely identify remote target
ResetID string
Endpoint string
Secure bool
}