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minio/cmd/notification.go

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20 KiB

/*
* Minio Cloud Storage, (C) 2018 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 (
"bytes"
"context"
"encoding/json"
"encoding/xml"
"errors"
"fmt"
"net/url"
"path"
"sync"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/event"
"github.com/minio/minio/pkg/hash"
xnet "github.com/minio/minio/pkg/net"
"github.com/minio/minio/pkg/policy"
)
// NotificationSys - notification system.
type NotificationSys struct {
sync.RWMutex
targetList *event.TargetList
bucketRulesMap map[string]event.RulesMap
bucketRemoteTargetRulesMap map[string]map[event.TargetID]event.RulesMap
peerRPCClientMap map[xnet.Host]*PeerRPCClient
}
// GetARNList - returns available ARNs.
func (sys *NotificationSys) GetARNList() []string {
arns := []string{}
region := globalServerConfig.GetRegion()
for _, targetID := range sys.targetList.List() {
arns = append(arns, targetID.ToARN(region).String())
}
return arns
}
// GetPeerRPCClient - returns PeerRPCClient of addr.
func (sys *NotificationSys) GetPeerRPCClient(addr xnet.Host) *PeerRPCClient {
return sys.peerRPCClientMap[addr]
}
// NotificationPeerErr returns error associated for a remote peer.
type NotificationPeerErr struct {
Host xnet.Host // Remote host on which the rpc call was initiated
Err error // Error returned by the remote peer for an rpc call
}
// DeleteBucket - calls DeleteBucket RPC call on all peers.
func (sys *NotificationSys) DeleteBucket(bucketName string) <-chan NotificationPeerErr {
errCh := make(chan NotificationPeerErr)
go func() {
defer close(errCh)
var wg sync.WaitGroup
for addr, client := range sys.peerRPCClientMap {
wg.Add(1)
go func(addr xnet.Host, client *PeerRPCClient) {
defer wg.Done()
if err := client.DeleteBucket(bucketName); err != nil {
errCh <- NotificationPeerErr{
Host: addr,
Err: err,
}
}
}(addr, client)
}
wg.Wait()
}()
return errCh
}
// SetBucketPolicy - calls SetBucketPolicy RPC call on all peers.
func (sys *NotificationSys) SetBucketPolicy(bucketName string, bucketPolicy *policy.Policy) <-chan NotificationPeerErr {
errCh := make(chan NotificationPeerErr)
go func() {
defer close(errCh)
var wg sync.WaitGroup
for addr, client := range sys.peerRPCClientMap {
wg.Add(1)
go func(addr xnet.Host, client *PeerRPCClient) {
defer wg.Done()
if err := client.SetBucketPolicy(bucketName, bucketPolicy); err != nil {
errCh <- NotificationPeerErr{
Host: addr,
Err: err,
}
}
}(addr, client)
}
wg.Wait()
}()
return errCh
}
// RemoveBucketPolicy - calls RemoveBucketPolicy RPC call on all peers.
func (sys *NotificationSys) RemoveBucketPolicy(bucketName string) <-chan NotificationPeerErr {
errCh := make(chan NotificationPeerErr)
go func() {
defer close(errCh)
var wg sync.WaitGroup
for addr, client := range sys.peerRPCClientMap {
wg.Add(1)
go func(addr xnet.Host, client *PeerRPCClient) {
defer wg.Done()
if err := client.RemoveBucketPolicy(bucketName); err != nil {
errCh <- NotificationPeerErr{
Host: addr,
Err: err,
}
}
}(addr, client)
}
wg.Wait()
}()
return errCh
}
// PutBucketNotification - calls PutBucketNotification RPC call on all peers.
func (sys *NotificationSys) PutBucketNotification(bucketName string, rulesMap event.RulesMap) <-chan NotificationPeerErr {
errCh := make(chan NotificationPeerErr)
go func() {
defer close(errCh)
var wg sync.WaitGroup
for addr, client := range sys.peerRPCClientMap {
wg.Add(1)
go func(addr xnet.Host, client *PeerRPCClient, rulesMap event.RulesMap) {
defer wg.Done()
if err := client.PutBucketNotification(bucketName, rulesMap); err != nil {
errCh <- NotificationPeerErr{
Host: addr,
Err: err,
}
}
}(addr, client, rulesMap.Clone())
}
wg.Wait()
}()
return errCh
}
// ListenBucketNotification - calls ListenBucketNotification RPC call on all peers.
func (sys *NotificationSys) ListenBucketNotification(bucketName string, eventNames []event.Name, pattern string,
targetID event.TargetID, localPeer xnet.Host) <-chan NotificationPeerErr {
errCh := make(chan NotificationPeerErr)
go func() {
defer close(errCh)
var wg sync.WaitGroup
for addr, client := range sys.peerRPCClientMap {
wg.Add(1)
go func(addr xnet.Host, client *PeerRPCClient) {
defer wg.Done()
if err := client.ListenBucketNotification(bucketName, eventNames, pattern, targetID, localPeer); err != nil {
errCh <- NotificationPeerErr{
Host: addr,
Err: err,
}
}
}(addr, client)
}
wg.Wait()
}()
return errCh
}
// AddRemoteTarget - adds event rules map, HTTP/PeerRPC client target to bucket name.
func (sys *NotificationSys) AddRemoteTarget(bucketName string, target event.Target, rulesMap event.RulesMap) error {
if err := sys.targetList.Add(target); err != nil {
return err
}
sys.Lock()
targetMap := sys.bucketRemoteTargetRulesMap[bucketName]
if targetMap == nil {
targetMap = make(map[event.TargetID]event.RulesMap)
}
targetMap[target.ID()] = rulesMap.Clone()
sys.bucketRemoteTargetRulesMap[bucketName] = targetMap
sys.Unlock()
sys.AddRulesMap(bucketName, rulesMap)
return nil
}
// RemoteTargetExist - checks whether given target ID is a HTTP/PeerRPC client target or not.
func (sys *NotificationSys) RemoteTargetExist(bucketName string, targetID event.TargetID) bool {
sys.Lock()
defer sys.Unlock()
targetMap, ok := sys.bucketRemoteTargetRulesMap[bucketName]
if ok {
_, ok = targetMap[targetID]
}
return ok
}
// initListeners - initializes PeerRPC clients available in listener.json.
func (sys *NotificationSys) initListeners(ctx context.Context, objAPI ObjectLayer, bucketName string) error {
// listener.json is available/applicable only in DistXL mode.
if !globalIsDistXL {
return nil
}
// Construct path to listener.json for the given bucket.
configFile := path.Join(bucketConfigPrefix, bucketName, bucketListenerConfig)
transactionConfigFile := configFile + ".transaction"
// As object layer's GetObject() and PutObject() take respective lock on minioMetaBucket
// and configFile, take a transaction lock to avoid data race between readConfig()
// and saveConfig().
objLock := globalNSMutex.NewNSLock(minioMetaBucket, transactionConfigFile)
if err := objLock.GetLock(globalOperationTimeout); err != nil {
return err
}
defer objLock.Unlock()
reader, e := readConfig(ctx, objAPI, configFile)
if e != nil && !IsErrIgnored(e, errDiskNotFound, errConfigNotFound) {
return e
}
listenerList := []ListenBucketNotificationArgs{}
if reader != nil {
err := json.NewDecoder(reader).Decode(&listenerList)
if err != nil {
logger.LogIf(ctx, err)
return err
}
}
if len(listenerList) == 0 {
// Nothing to initialize for empty listener list.
return nil
}
activeListenerList := []ListenBucketNotificationArgs{}
for _, args := range listenerList {
found, err := isLocalHost(args.Addr.Name)
if err != nil {
logger.GetReqInfo(ctx).AppendTags("host", args.Addr.Name)
logger.LogIf(ctx, err)
return err
}
if found {
// As this function is called at startup, skip HTTP listener to this host.
continue
}
rpcClient := sys.GetPeerRPCClient(args.Addr)
if rpcClient == nil {
return fmt.Errorf("unable to find PeerRPCClient by address %v in listener.json for bucket %v", args.Addr, bucketName)
}
exist, err := rpcClient.RemoteTargetExist(bucketName, args.TargetID)
if err != nil {
logger.GetReqInfo(ctx).AppendTags("targetID", args.TargetID.Name)
logger.LogIf(ctx, err)
return err
}
if !exist {
// Skip previously connected HTTP listener which is not found in remote peer.
continue
}
target := NewPeerRPCClientTarget(bucketName, args.TargetID, rpcClient)
rulesMap := event.NewRulesMap(args.EventNames, args.Pattern, target.ID())
if err = sys.AddRemoteTarget(bucketName, target, rulesMap); err != nil {
logger.GetReqInfo(ctx).AppendTags("targetName", target.id.Name)
logger.LogIf(ctx, err)
return err
}
activeListenerList = append(activeListenerList, args)
}
data, err := json.Marshal(activeListenerList)
if err != nil {
logger.LogIf(ctx, err)
return err
}
return saveConfig(objAPI, configFile, data)
}
// Init - initializes notification system from notification.xml and listener.json of all buckets.
func (sys *NotificationSys) Init(objAPI ObjectLayer) error {
if objAPI == nil {
return errInvalidArgument
}
buckets, err := objAPI.ListBuckets(context.Background())
if err != nil {
return err
}
for _, bucket := range buckets {
ctx := logger.SetReqInfo(context.Background(), &logger.ReqInfo{BucketName: bucket.Name})
config, err := readNotificationConfig(ctx, objAPI, bucket.Name)
if err != nil {
if !IsErrIgnored(err, errDiskNotFound, errNoSuchNotifications) {
return err
}
} else {
sys.AddRulesMap(bucket.Name, config.ToRulesMap())
}
if err = sys.initListeners(ctx, objAPI, bucket.Name); err != nil {
return err
}
}
return nil
}
// AddRulesMap - adds rules map for bucket name.
func (sys *NotificationSys) AddRulesMap(bucketName string, rulesMap event.RulesMap) {
sys.Lock()
defer sys.Unlock()
rulesMap = rulesMap.Clone()
for _, targetRulesMap := range sys.bucketRemoteTargetRulesMap[bucketName] {
rulesMap.Add(targetRulesMap)
}
rulesMap.Add(sys.bucketRulesMap[bucketName])
sys.bucketRulesMap[bucketName] = rulesMap
}
// RemoveRulesMap - removes rules map for bucket name.
func (sys *NotificationSys) RemoveRulesMap(bucketName string, rulesMap event.RulesMap) {
sys.Lock()
defer sys.Unlock()
sys.bucketRulesMap[bucketName].Remove(rulesMap)
if len(sys.bucketRulesMap[bucketName]) == 0 {
delete(sys.bucketRulesMap, bucketName)
}
}
// RemoveNotification - removes all notification configuration for bucket name.
func (sys *NotificationSys) RemoveNotification(bucketName string) {
sys.Lock()
defer sys.Unlock()
delete(sys.bucketRulesMap, bucketName)
for targetID := range sys.bucketRemoteTargetRulesMap[bucketName] {
sys.targetList.Remove(targetID)
delete(sys.bucketRemoteTargetRulesMap[bucketName], targetID)
}
delete(sys.bucketRemoteTargetRulesMap, bucketName)
}
// RemoveAllRemoteTargets - closes and removes all HTTP/PeerRPC client targets.
func (sys *NotificationSys) RemoveAllRemoteTargets() {
for _, targetMap := range sys.bucketRemoteTargetRulesMap {
for targetID := range targetMap {
sys.targetList.Remove(targetID)
}
}
}
// RemoveRemoteTarget - closes and removes target by target ID.
func (sys *NotificationSys) RemoveRemoteTarget(bucketName string, targetID event.TargetID) {
for terr := range sys.targetList.Remove(targetID) {
reqInfo := (&logger.ReqInfo{}).AppendTags("targetID", terr.ID.Name)
ctx := logger.SetReqInfo(context.Background(), reqInfo)
logger.LogIf(ctx, terr.Err)
}
sys.Lock()
defer sys.Unlock()
if _, ok := sys.bucketRemoteTargetRulesMap[bucketName]; ok {
delete(sys.bucketRemoteTargetRulesMap[bucketName], targetID)
if len(sys.bucketRemoteTargetRulesMap[bucketName]) == 0 {
delete(sys.bucketRemoteTargetRulesMap, bucketName)
}
}
}
func (sys *NotificationSys) send(bucketName string, eventData event.Event, targetIDs ...event.TargetID) (errs []event.TargetIDErr) {
errCh := sys.targetList.Send(eventData, targetIDs...)
for terr := range errCh {
errs = append(errs, terr)
if sys.RemoteTargetExist(bucketName, terr.ID) {
sys.RemoveRemoteTarget(bucketName, terr.ID)
}
}
return errs
}
// Send - sends event data to all matching targets.
func (sys *NotificationSys) Send(args eventArgs) []event.TargetIDErr {
sys.RLock()
targetIDSet := sys.bucketRulesMap[args.BucketName].Match(args.EventName, args.Object.Name)
sys.RUnlock()
if len(targetIDSet) == 0 {
return nil
}
targetIDs := targetIDSet.ToSlice()
return sys.send(args.BucketName, args.ToEvent(), targetIDs...)
}
// NewNotificationSys - creates new notification system object.
func NewNotificationSys(config *serverConfig, endpoints EndpointList) (*NotificationSys, error) {
targetList, err := getNotificationTargets(config)
if err != nil {
return nil, err
}
peerRPCClientMap := makeRemoteRPCClients(endpoints)
// bucketRulesMap/bucketRemoteTargetRulesMap are initialized by NotificationSys.Init()
return &NotificationSys{
targetList: targetList,
bucketRulesMap: make(map[string]event.RulesMap),
bucketRemoteTargetRulesMap: make(map[string]map[event.TargetID]event.RulesMap),
peerRPCClientMap: peerRPCClientMap,
}, nil
}
type eventArgs struct {
EventName event.Name
BucketName string
Object ObjectInfo
ReqParams map[string]string
Host string
Port string
UserAgent string
}
// ToEvent - converts to notification event.
func (args eventArgs) ToEvent() event.Event {
getOriginEndpoint := func() string {
host := globalMinioHost
if host == "" {
// FIXME: Send FQDN or hostname of this machine than sending IP address.
host = localIP4.ToSlice()[0]
}
return fmt.Sprintf("%s://%s:%s", getURLScheme(globalIsSSL), host, globalMinioPort)
}
creds := globalServerConfig.GetCredential()
eventTime := UTCNow()
uniqueID := fmt.Sprintf("%X", eventTime.UnixNano())
newEvent := event.Event{
EventVersion: "2.0",
EventSource: "minio:s3",
AwsRegion: globalServerConfig.GetRegion(),
EventTime: eventTime.Format(event.AMZTimeFormat),
EventName: args.EventName,
UserIdentity: event.Identity{creds.AccessKey},
RequestParameters: args.ReqParams,
ResponseElements: map[string]string{
"x-amz-request-id": uniqueID,
"x-minio-origin-endpoint": getOriginEndpoint(), // Minio specific custom elements.
},
S3: event.Metadata{
SchemaVersion: "1.0",
ConfigurationID: "Config",
Bucket: event.Bucket{
Name: args.BucketName,
OwnerIdentity: event.Identity{creds.AccessKey},
ARN: policy.ResourceARNPrefix + args.BucketName,
},
Object: event.Object{
Key: url.QueryEscape(args.Object.Name),
VersionID: "1",
Sequencer: uniqueID,
},
},
Source: event.Source{
Host: args.Host,
Port: args.Port,
UserAgent: args.UserAgent,
},
}
if args.EventName != event.ObjectRemovedDelete {
newEvent.S3.Object.ETag = args.Object.ETag
newEvent.S3.Object.Size = args.Object.Size
newEvent.S3.Object.ContentType = args.Object.ContentType
newEvent.S3.Object.UserMetadata = args.Object.UserDefined
}
return newEvent
}
func sendEvent(args eventArgs) {
// globalNotificationSys is not initialized in gateway mode.
if globalNotificationSys == nil {
return
}
for _, err := range globalNotificationSys.Send(args) {
reqInfo := &logger.ReqInfo{BucketName: args.BucketName, ObjectName: args.Object.Name}
reqInfo.AppendTags("EventName", args.EventName.String())
reqInfo.AppendTags("targetID", err.ID.Name)
ctx := logger.SetReqInfo(context.Background(), reqInfo)
logger.LogOnceIf(ctx, err.Err, err.ID)
}
}
func saveConfig(objAPI ObjectLayer, configFile string, data []byte) error {
hashReader, err := hash.NewReader(bytes.NewReader(data), int64(len(data)), "", getSHA256Hash(data))
if err != nil {
return err
}
_, err = objAPI.PutObject(context.Background(), minioMetaBucket, configFile, hashReader, nil)
return err
}
var errConfigNotFound = errors.New("config file not found")
func readConfig(ctx context.Context, objAPI ObjectLayer, configFile string) (*bytes.Buffer, error) {
var buffer bytes.Buffer
// Read entire content by setting size to -1
err := objAPI.GetObject(ctx, minioMetaBucket, configFile, 0, -1, &buffer, "")
if err != nil {
// Ignore if err is ObjectNotFound or IncompleteBody when bucket is not configured with notification
if isErrObjectNotFound(err) || isErrIncompleteBody(err) {
return nil, errConfigNotFound
}
logger.GetReqInfo(ctx).AppendTags("configFile", configFile)
logger.LogIf(ctx, err)
return nil, err
}
// Return NoSuchNotifications on empty content.
if buffer.Len() == 0 {
return nil, errNoSuchNotifications
}
return &buffer, nil
}
func readNotificationConfig(ctx context.Context, objAPI ObjectLayer, bucketName string) (*event.Config, error) {
// Construct path to notification.xml for the given bucket.
configFile := path.Join(bucketConfigPrefix, bucketName, bucketNotificationConfig)
reader, err := readConfig(ctx, objAPI, configFile)
if err != nil {
if err == errConfigNotFound {
err = errNoSuchNotifications
}
return nil, err
}
config, err := event.ParseConfig(reader, globalServerConfig.GetRegion(), globalNotificationSys.targetList)
logger.LogIf(ctx, err)
return config, err
}
func saveNotificationConfig(objAPI ObjectLayer, bucketName string, config *event.Config) error {
data, err := xml.Marshal(config)
if err != nil {
return err
}
configFile := path.Join(bucketConfigPrefix, bucketName, bucketNotificationConfig)
return saveConfig(objAPI, configFile, data)
}
// SaveListener - saves HTTP client currently listening for events to listener.json.
func SaveListener(objAPI ObjectLayer, bucketName string, eventNames []event.Name, pattern string, targetID event.TargetID, addr xnet.Host) error {
// listener.json is available/applicable only in DistXL mode.
if !globalIsDistXL {
return nil
}
ctx := logger.SetReqInfo(context.Background(), &logger.ReqInfo{BucketName: bucketName})
// Construct path to listener.json for the given bucket.
configFile := path.Join(bucketConfigPrefix, bucketName, bucketListenerConfig)
transactionConfigFile := configFile + ".transaction"
// As object layer's GetObject() and PutObject() take respective lock on minioMetaBucket
// and configFile, take a transaction lock to avoid data race between readConfig()
// and saveConfig().
objLock := globalNSMutex.NewNSLock(minioMetaBucket, transactionConfigFile)
if err := objLock.GetLock(globalOperationTimeout); err != nil {
return err
}
defer objLock.Unlock()
reader, err := readConfig(ctx, objAPI, configFile)
if err != nil && !IsErrIgnored(err, errDiskNotFound, errConfigNotFound) {
return err
}
listenerList := []ListenBucketNotificationArgs{}
if reader != nil {
if err = json.NewDecoder(reader).Decode(&listenerList); err != nil {
logger.LogIf(ctx, err)
return err
}
}
listenerList = append(listenerList, ListenBucketNotificationArgs{
EventNames: eventNames,
Pattern: pattern,
TargetID: targetID,
Addr: addr,
})
data, err := json.Marshal(listenerList)
if err != nil {
logger.LogIf(ctx, err)
return err
}
return saveConfig(objAPI, configFile, data)
}
// RemoveListener - removes HTTP client currently listening for events from listener.json.
func RemoveListener(objAPI ObjectLayer, bucketName string, targetID event.TargetID, addr xnet.Host) error {
// listener.json is available/applicable only in DistXL mode.
if !globalIsDistXL {
return nil
}
ctx := logger.SetReqInfo(context.Background(), &logger.ReqInfo{BucketName: bucketName})
// Construct path to listener.json for the given bucket.
configFile := path.Join(bucketConfigPrefix, bucketName, bucketListenerConfig)
transactionConfigFile := configFile + ".transaction"
// As object layer's GetObject() and PutObject() take respective lock on minioMetaBucket
// and configFile, take a transaction lock to avoid data race between readConfig()
// and saveConfig().
objLock := globalNSMutex.NewNSLock(minioMetaBucket, transactionConfigFile)
if err := objLock.GetLock(globalOperationTimeout); err != nil {
return err
}
defer objLock.Unlock()
reader, err := readConfig(ctx, objAPI, configFile)
if err != nil && !IsErrIgnored(err, errDiskNotFound, errConfigNotFound) {
return err
}
listenerList := []ListenBucketNotificationArgs{}
if reader != nil {
if err = json.NewDecoder(reader).Decode(&listenerList); err != nil {
logger.LogIf(ctx, err)
return err
}
}
if len(listenerList) == 0 {
// Nothing to remove.
return nil
}
activeListenerList := []ListenBucketNotificationArgs{}
for _, args := range listenerList {
if args.TargetID == targetID && args.Addr.Equal(addr) {
// Skip if matches
continue
}
activeListenerList = append(activeListenerList, args)
}
data, err := json.Marshal(activeListenerList)
if err != nil {
logger.LogIf(ctx, err)
return err
}
return saveConfig(objAPI, configFile, data)
}