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/*
* 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 target
import (
"context"
"crypto/tls"
"crypto/x509"
"encoding/json"
"errors"
"net/url"
"os"
"path/filepath"
"github.com/minio/minio/pkg/event"
xnet "github.com/minio/minio/pkg/net"
"github.com/nats-io/nats.go"
"github.com/nats-io/stan.go"
)
// NATS related constants
const (
NATSAddress = "address"
NATSSubject = "subject"
NATSUsername = "username"
NATSPassword = "password"
NATSToken = "token"
NATSTLS = "tls"
NATSTLSSkipVerify = "tls_skip_verify"
NATSPingInterval = "ping_interval"
NATSQueueDir = "queue_dir"
NATSQueueLimit = "queue_limit"
NATSCertAuthority = "cert_authority"
NATSClientCert = "client_cert"
NATSClientKey = "client_key"
// Streaming constants
NATSStreaming = "streaming"
NATSStreamingClusterID = "streaming_cluster_id"
NATSStreamingAsync = "streaming_async"
NATSStreamingMaxPubAcksInFlight = "streaming_max_pub_acks_in_flight"
EnvNATSEnable = "MINIO_NOTIFY_NATS_ENABLE"
EnvNATSAddress = "MINIO_NOTIFY_NATS_ADDRESS"
EnvNATSSubject = "MINIO_NOTIFY_NATS_SUBJECT"
EnvNATSUsername = "MINIO_NOTIFY_NATS_USERNAME"
EnvNATSPassword = "MINIO_NOTIFY_NATS_PASSWORD"
EnvNATSToken = "MINIO_NOTIFY_NATS_TOKEN"
EnvNATSTLS = "MINIO_NOTIFY_NATS_TLS"
EnvNATSTLSSkipVerify = "MINIO_NOTIFY_NATS_TLS_SKIP_VERIFY"
EnvNATSPingInterval = "MINIO_NOTIFY_NATS_PING_INTERVAL"
EnvNATSQueueDir = "MINIO_NOTIFY_NATS_QUEUE_DIR"
EnvNATSQueueLimit = "MINIO_NOTIFY_NATS_QUEUE_LIMIT"
EnvNATSCertAuthority = "MINIO_NOTIFY_NATS_CERT_AUTHORITY"
EnvNATSClientCert = "MINIO_NOTIFY_NATS_CLIENT_CERT"
EnvNATSClientKey = "MINIO_NOTIFY_NATS_CLIENT_KEY"
// Streaming constants
EnvNATSStreaming = "MINIO_NOTIFY_NATS_STREAMING"
EnvNATSStreamingClusterID = "MINIO_NOTIFY_NATS_STREAMING_CLUSTER_ID"
EnvNATSStreamingAsync = "MINIO_NOTIFY_NATS_STREAMING_ASYNC"
EnvNATSStreamingMaxPubAcksInFlight = "MINIO_NOTIFY_NATS_STREAMING_MAX_PUB_ACKS_IN_FLIGHT"
)
// NATSArgs - NATS target arguments.
type NATSArgs struct {
Enable bool `json:"enable"`
Address xnet.Host `json:"address"`
Subject string `json:"subject"`
Username string `json:"username"`
Password string `json:"password"`
Token string `json:"token"`
TLS bool `json:"tls"`
TLSSkipVerify bool `json:"tlsSkipVerify"`
Secure bool `json:"secure"`
CertAuthority string `json:"certAuthority"`
ClientCert string `json:"clientCert"`
ClientKey string `json:"clientKey"`
PingInterval int64 `json:"pingInterval"`
QueueDir string `json:"queueDir"`
QueueLimit uint64 `json:"queueLimit"`
Streaming struct {
Enable bool `json:"enable"`
ClusterID string `json:"clusterID"`
Async bool `json:"async"`
MaxPubAcksInflight int `json:"maxPubAcksInflight"`
} `json:"streaming"`
RootCAs *x509.CertPool `json:"-"`
}
// Validate NATSArgs fields
func (n NATSArgs) Validate() error {
if !n.Enable {
return nil
}
if n.Address.IsEmpty() {
return errors.New("empty address")
}
if n.Subject == "" {
return errors.New("empty subject")
}
if n.ClientCert != "" && n.ClientKey == "" || n.ClientCert == "" && n.ClientKey != "" {
return errors.New("cert and key must be specified as a pair")
}
if n.Username != "" && n.Password == "" || n.Username == "" && n.Password != "" {
return errors.New("username and password must be specified as a pair")
}
if n.Streaming.Enable {
if n.Streaming.ClusterID == "" {
return errors.New("empty cluster id")
}
}
if n.QueueDir != "" {
if !filepath.IsAbs(n.QueueDir) {
return errors.New("queueDir path should be absolute")
}
}
return nil
}
// To obtain a nats connection from args.
func (n NATSArgs) connectNats() (*nats.Conn, error) {
connOpts := []nats.Option{nats.Name("Minio Notification")}
if n.Username != "" && n.Password != "" {
connOpts = append(connOpts, nats.UserInfo(n.Username, n.Password))
}
if n.Token != "" {
connOpts = append(connOpts, nats.Token(n.Token))
}
if n.Secure || n.TLS && n.TLSSkipVerify {
connOpts = append(connOpts, nats.Secure(nil))
} else if n.TLS {
connOpts = append(connOpts, nats.Secure(&tls.Config{RootCAs: n.RootCAs}))
}
if n.CertAuthority != "" {
connOpts = append(connOpts, nats.RootCAs(n.CertAuthority))
}
if n.ClientCert != "" && n.ClientKey != "" {
connOpts = append(connOpts, nats.ClientCert(n.ClientCert, n.ClientKey))
}
return nats.Connect(n.Address.String(), connOpts...)
}
// To obtain a streaming connection from args.
func (n NATSArgs) connectStan() (stan.Conn, error) {
scheme := "nats"
if n.Secure {
scheme = "tls"
}
var addressURL string
if n.Username != "" && n.Password != "" {
addressURL = scheme + "://" + n.Username + ":" + n.Password + "@" + n.Address.String()
} else if n.Token != "" {
addressURL = scheme + "://" + n.Token + "@" + n.Address.String()
} else {
addressURL = scheme + "://" + n.Address.String()
}
clientID, err := getNewUUID()
if err != nil {
return nil, err
}
connOpts := []stan.Option{stan.NatsURL(addressURL)}
if n.Streaming.MaxPubAcksInflight > 0 {
connOpts = append(connOpts, stan.MaxPubAcksInflight(n.Streaming.MaxPubAcksInflight))
}
return stan.Connect(n.Streaming.ClusterID, clientID, connOpts...)
}
// NATSTarget - NATS target.
type NATSTarget struct {
id event.TargetID
args NATSArgs
natsConn *nats.Conn
stanConn stan.Conn
store Store
loggerOnce func(ctx context.Context, err error, id interface{}, errKind ...interface{})
}
// ID - returns target ID.
func (target *NATSTarget) ID() event.TargetID {
return target.id
}
// HasQueueStore - Checks if the queueStore has been configured for the target
func (target *NATSTarget) HasQueueStore() bool {
return target.store != nil
}
// IsActive - Return true if target is up and active
func (target *NATSTarget) IsActive() (bool, error) {
var connErr error
if target.args.Streaming.Enable {
if target.stanConn == nil || target.stanConn.NatsConn() == nil {
target.stanConn, connErr = target.args.connectStan()
} else {
if !target.stanConn.NatsConn().IsConnected() {
return false, errNotConnected
}
}
} else {
if target.natsConn == nil {
target.natsConn, connErr = target.args.connectNats()
} else {
if !target.natsConn.IsConnected() {
return false, errNotConnected
}
}
}
if connErr != nil {
if connErr.Error() == nats.ErrNoServers.Error() {
return false, errNotConnected
}
return false, connErr
}
return true, nil
}
// Save - saves the events to the store which will be replayed when the Nats connection is active.
func (target *NATSTarget) Save(eventData event.Event) error {
if target.store != nil {
return target.store.Put(eventData)
}
_, err := target.IsActive()
if err != nil {
return err
}
return target.send(eventData)
}
// send - sends an event to the Nats.
func (target *NATSTarget) send(eventData event.Event) error {
objectName, err := url.QueryUnescape(eventData.S3.Object.Key)
if err != nil {
return err
}
key := eventData.S3.Bucket.Name + "/" + objectName
data, err := json.Marshal(event.Log{EventName: eventData.EventName, Key: key, Records: []event.Event{eventData}})
if err != nil {
return err
}
if target.stanConn != nil {
if target.args.Streaming.Async {
_, err = target.stanConn.PublishAsync(target.args.Subject, data, nil)
} else {
err = target.stanConn.Publish(target.args.Subject, data)
}
} else {
err = target.natsConn.Publish(target.args.Subject, data)
}
return err
}
// Send - sends event to Nats.
func (target *NATSTarget) Send(eventKey string) error {
_, err := target.IsActive()
if err != nil {
return err
}
eventData, eErr := target.store.Get(eventKey)
if eErr != nil {
// The last event key in a successful batch will be sent in the channel atmost once by the replayEvents()
// Such events will not exist and wouldve been already been sent successfully.
if os.IsNotExist(eErr) {
return nil
}
return eErr
}
if err := target.send(eventData); err != nil {
return err
}
return target.store.Del(eventKey)
}
// Close - closes underneath connections to NATS server.
func (target *NATSTarget) Close() (err error) {
if target.stanConn != nil {
// closing the streaming connection does not close the provided NATS connection.
if target.stanConn.NatsConn() != nil {
target.stanConn.NatsConn().Close()
}
err = target.stanConn.Close()
}
if target.natsConn != nil {
target.natsConn.Close()
}
return err
}
// NewNATSTarget - creates new NATS target.
func NewNATSTarget(id string, args NATSArgs, doneCh <-chan struct{}, loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{}), test bool) (*NATSTarget, error) {
var natsConn *nats.Conn
var stanConn stan.Conn
var err error
var store Store
target := &NATSTarget{
id: event.TargetID{ID: id, Name: "nats"},
args: args,
loggerOnce: loggerOnce,
}
if args.QueueDir != "" {
queueDir := filepath.Join(args.QueueDir, storePrefix+"-nats-"+id)
store = NewQueueStore(queueDir, args.QueueLimit)
if oErr := store.Open(); oErr != nil {
target.loggerOnce(context.Background(), oErr, target.ID())
return target, oErr
}
target.store = store
}
if args.Streaming.Enable {
stanConn, err = args.connectStan()
target.stanConn = stanConn
} else {
natsConn, err = args.connectNats()
target.natsConn = natsConn
}
if err != nil {
if store == nil || err.Error() != nats.ErrNoServers.Error() {
target.loggerOnce(context.Background(), err, target.ID())
return target, err
}
}
if target.store != nil && !test {
// Replays the events from the store.
eventKeyCh := replayEvents(target.store, doneCh, target.loggerOnce, target.ID())
// Start replaying events from the store.
go sendEvents(target, eventKeyCh, doneCh, target.loggerOnce)
}
return target, nil
}