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Copy pathnats.go
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167 lines (143 loc) · 4.06 KB
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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 (
"encoding/json"
"errors"
"net/url"
"github.com/minio/minio/pkg/event"
xnet "github.com/minio/minio/pkg/net"
"github.com/nats-io/go-nats-streaming"
"github.com/nats-io/nats"
)
// 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"`
Secure bool `json:"secure"`
PingInterval int64 `json:"pingInterval"`
Streaming struct {
Enable bool `json:"enable"`
ClusterID string `json:"clusterID"`
Async bool `json:"async"`
MaxPubAcksInflight int `json:"maxPubAcksInflight"`
} `json:"streaming"`
}
// 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.Streaming.Enable {
if n.Streaming.ClusterID == "" {
return errors.New("empty cluster id")
}
}
return nil
}
// NATSTarget - NATS target.
type NATSTarget struct {
id event.TargetID
args NATSArgs
natsConn *nats.Conn
stanConn stan.Conn
}
// ID - returns target ID.
func (target *NATSTarget) ID() event.TargetID {
return target.id
}
// Send - sends event to NATS.
func (target *NATSTarget) Send(eventData event.Event) (err 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
}
// Close - closes underneath connections to NATS server.
func (target *NATSTarget) Close() (err error) {
if target.stanConn != nil {
err = target.stanConn.Close()
}
if target.natsConn != nil {
target.natsConn.Close()
}
return err
}
// NewNATSTarget - creates new NATS target.
func NewNATSTarget(id string, args NATSArgs) (*NATSTarget, error) {
var natsConn *nats.Conn
var stanConn stan.Conn
var clientID string
var err error
if args.Streaming.Enable {
scheme := "nats"
if args.Secure {
scheme = "tls"
}
addressURL := scheme + "://" + args.Username + ":" + args.Password + "@" + args.Address.String()
clientID, err = getNewUUID()
if err != nil {
return nil, err
}
connOpts := []stan.Option{stan.NatsURL(addressURL)}
if args.Streaming.MaxPubAcksInflight > 0 {
connOpts = append(connOpts, stan.MaxPubAcksInflight(args.Streaming.MaxPubAcksInflight))
}
stanConn, err = stan.Connect(args.Streaming.ClusterID, clientID, connOpts...)
} else {
options := nats.DefaultOptions
options.Url = "nats://" + args.Address.String()
options.User = args.Username
options.Password = args.Password
options.Token = args.Token
options.Secure = args.Secure
natsConn, err = options.Connect()
}
if err != nil {
return nil, err
}
return &NATSTarget{
id: event.TargetID{ID: id, Name: "nats"},
args: args,
stanConn: stanConn,
natsConn: natsConn,
}, nil
}