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/*
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* Minio Cloud Storage, (C) 2018 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package target
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import (
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"crypto/tls"
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"crypto/x509"
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"encoding/json"
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"errors"
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"net/url"
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"path/filepath"
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"time"
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"github.com/eclipse/paho.mqtt.golang"
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"github.com/minio/minio/pkg/event"
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xnet "github.com/minio/minio/pkg/net"
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)
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const (
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retryInterval = 3 // In Seconds
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reconnectInterval = 5 // In Seconds
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)
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// MQTTArgs - MQTT target arguments.
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type MQTTArgs struct {
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Enable bool `json:"enable"`
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Broker xnet.URL `json:"broker"`
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Topic string `json:"topic"`
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QoS byte `json:"qos"`
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User string `json:"username"`
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Password string `json:"password"`
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MaxReconnectInterval time.Duration `json:"reconnectInterval"`
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KeepAlive time.Duration `json:"keepAliveInterval"`
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RootCAs *x509.CertPool `json:"-"`
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QueueDir string `json:"queueDir"`
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QueueLimit uint16 `json:"queueLimit"`
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}
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// Validate MQTTArgs fields
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func (m MQTTArgs) Validate() error {
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if !m.Enable {
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return nil
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}
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u, err := xnet.ParseURL(m.Broker.String())
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if err != nil {
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return err
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}
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switch u.Scheme {
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case "ws", "wss", "tcp", "ssl", "tls", "tcps":
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default:
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return errors.New("unknown protocol in broker address")
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}
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if m.QueueDir != "" {
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if !filepath.IsAbs(m.QueueDir) {
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return errors.New("queueDir path should be absolute")
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}
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if m.QoS == 0 {
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return errors.New("qos should be set to 1 or 2 if queueDir is set")
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}
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}
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return nil
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}
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// MQTTTarget - MQTT target.
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type MQTTTarget struct {
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id event.TargetID
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args MQTTArgs
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client mqtt.Client
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store Store
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reconn bool
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}
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// ID - returns target ID.
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func (target *MQTTTarget) ID() event.TargetID {
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return target.id
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}
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// Reads persisted events from the store and re-plays.
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func (target *MQTTTarget) retry() {
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target.reconn = true
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events := target.store.ListAll()
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for len(events) != 0 {
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for _, key := range events {
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event, eErr := target.store.Get(key)
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if eErr != nil {
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continue
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}
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for !target.client.IsConnectionOpen() {
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time.Sleep(retryInterval * time.Second)
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}
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// The connection is open.
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if err := target.send(event); err != nil {
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continue
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}
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// Delete after a successful publish.
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target.store.Del(key)
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}
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events = target.store.ListAll()
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}
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// Release the reconn state.
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target.reconn = false
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}
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func (target *MQTTTarget) send(eventData event.Event) error {
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objectName, err := url.QueryUnescape(eventData.S3.Object.Key)
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if err != nil {
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return err
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}
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key := eventData.S3.Bucket.Name + "/" + objectName
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data, err := json.Marshal(event.Log{EventName: eventData.EventName, Key: key, Records: []event.Event{eventData}})
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if err != nil {
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return err
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}
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token := target.client.Publish(target.args.Topic, target.args.QoS, false, string(data))
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token.Wait()
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return token.Error()
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}
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// Send - sends event to MQTT when the connection is active.
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func (target *MQTTTarget) Send(eventData event.Event) error {
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// Persist the events if the connection is not active.
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if !target.client.IsConnectionOpen() {
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if err := target.store.Put(eventData); err != nil {
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return err
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}
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// Ignore if retry is triggered already.
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if !target.reconn {
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go target.retry()
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}
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return nil
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}
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// Publishes to the broker as the connection is active.
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return target.send(eventData)
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}
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// Close - does nothing and available for interface compatibility.
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func (target *MQTTTarget) Close() error {
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return nil
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}
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// NewMQTTTarget - creates new MQTT target.
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func NewMQTTTarget(id string, args MQTTArgs) (*MQTTTarget, error) {
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options := mqtt.NewClientOptions().
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SetClientID("").
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SetCleanSession(true).
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SetUsername(args.User).
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SetPassword(args.Password).
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SetMaxReconnectInterval(args.MaxReconnectInterval).
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SetKeepAlive(args.KeepAlive).
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SetTLSConfig(&tls.Config{RootCAs: args.RootCAs}).
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AddBroker(args.Broker.String())
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var store Store
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if args.QueueDir != "" {
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store = NewQueueStore(args.QueueDir, args.QueueLimit)
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if oErr := store.Open(); oErr != nil {
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return nil, oErr
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}
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} else {
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store = NewMemoryStore(args.QueueLimit)
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}
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client := mqtt.NewClient(options)
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// The client should establish a first time connection.
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// Connect() should be successful atleast once to publish events.
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token := client.Connect()
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go func() {
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// Repeat the pings until the client registers the clientId and receives a token.
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for {
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if token.Wait() && token.Error() == nil {
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// Connected
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break
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}
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// Reconnecting
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time.Sleep(reconnectInterval * time.Second)
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token = client.Connect()
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}
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}()
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target := &MQTTTarget{
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id: event.TargetID{ID: id, Name: "mqtt"},
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args: args,
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client: client,
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store: store,
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reconn: false,
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}
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// Replay any previously persisted events in the store.
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if len(target.store.ListAll()) != 0 {
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go target.retry()
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}
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return target, nil
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}
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