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Copy pathmqtt.go
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280 lines (249 loc) · 7.73 KB
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/*
* MinIO Cloud Storage, (C) 2018-2019 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"
"fmt"
"net/url"
"os"
"path/filepath"
"time"
mqtt "github.com/eclipse/paho.mqtt.golang"
"github.com/minio/minio/pkg/event"
xnet "github.com/minio/minio/pkg/net"
)
const (
reconnectInterval = 5 // In Seconds
storePrefix = "minio"
)
// MQTT input constants
const (
MqttBroker = "broker"
MqttTopic = "topic"
MqttQoS = "qos"
MqttUsername = "username"
MqttPassword = "password"
MqttReconnectInterval = "reconnect_interval"
MqttKeepAliveInterval = "keep_alive_interval"
MqttQueueDir = "queue_dir"
MqttQueueLimit = "queue_limit"
EnvMQTTEnable = "MINIO_NOTIFY_MQTT_ENABLE"
EnvMQTTBroker = "MINIO_NOTIFY_MQTT_BROKER"
EnvMQTTTopic = "MINIO_NOTIFY_MQTT_TOPIC"
EnvMQTTQoS = "MINIO_NOTIFY_MQTT_QOS"
EnvMQTTUsername = "MINIO_NOTIFY_MQTT_USERNAME"
EnvMQTTPassword = "MINIO_NOTIFY_MQTT_PASSWORD"
EnvMQTTReconnectInterval = "MINIO_NOTIFY_MQTT_RECONNECT_INTERVAL"
EnvMQTTKeepAliveInterval = "MINIO_NOTIFY_MQTT_KEEP_ALIVE_INTERVAL"
EnvMQTTQueueDir = "MINIO_NOTIFY_MQTT_QUEUE_DIR"
EnvMQTTQueueLimit = "MINIO_NOTIFY_MQTT_QUEUE_LIMIT"
)
// MQTTArgs - MQTT target arguments.
type MQTTArgs struct {
Enable bool `json:"enable"`
Broker xnet.URL `json:"broker"`
Topic string `json:"topic"`
QoS byte `json:"qos"`
User string `json:"username"`
Password string `json:"password"`
MaxReconnectInterval time.Duration `json:"reconnectInterval"`
KeepAlive time.Duration `json:"keepAliveInterval"`
RootCAs *x509.CertPool `json:"-"`
QueueDir string `json:"queueDir"`
QueueLimit uint64 `json:"queueLimit"`
}
// Validate MQTTArgs fields
func (m MQTTArgs) Validate() error {
if !m.Enable {
return nil
}
u, err := xnet.ParseURL(m.Broker.String())
if err != nil {
return err
}
switch u.Scheme {
case "ws", "wss", "tcp", "ssl", "tls", "tcps":
default:
return errors.New("unknown protocol in broker address")
}
if m.QueueDir != "" {
if !filepath.IsAbs(m.QueueDir) {
return errors.New("queueDir path should be absolute")
}
if m.QoS == 0 {
return errors.New("qos should be set to 1 or 2 if queueDir is set")
}
}
return nil
}
// MQTTTarget - MQTT target.
type MQTTTarget struct {
id event.TargetID
args MQTTArgs
client mqtt.Client
store Store
quitCh chan struct{}
loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{})
}
// ID - returns target ID.
func (target *MQTTTarget) ID() event.TargetID {
return target.id
}
// HasQueueStore - Checks if the queueStore has been configured for the target
func (target *MQTTTarget) HasQueueStore() bool {
return target.store != nil
}
// IsActive - Return true if target is up and active
func (target *MQTTTarget) IsActive() (bool, error) {
if !target.client.IsConnectionOpen() {
return false, errNotConnected
}
return true, nil
}
// send - sends an event to the mqtt.
func (target *MQTTTarget) 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
}
token := target.client.Publish(target.args.Topic, target.args.QoS, false, string(data))
if !token.WaitTimeout(reconnectInterval * time.Second) {
return errNotConnected
}
return token.Error()
}
// Send - reads an event from store and sends it to MQTT.
func (target *MQTTTarget) Send(eventKey string) error {
// Do not send if the connection is not active.
_, err := target.IsActive()
if err != nil {
return err
}
eventData, err := target.store.Get(eventKey)
if err != 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(err) {
return nil
}
return err
}
if err = target.send(eventData); err != nil {
return err
}
// Delete the event from store.
return target.store.Del(eventKey)
}
// Save - saves the events to the store if queuestore is configured, which will
// be replayed when the mqtt connection is active.
func (target *MQTTTarget) Save(eventData event.Event) error {
if target.store != nil {
return target.store.Put(eventData)
}
// Do not send if the connection is not active.
_, err := target.IsActive()
if err != nil {
return err
}
return target.send(eventData)
}
// Close - does nothing and available for interface compatibility.
func (target *MQTTTarget) Close() error {
target.client.Disconnect(100)
close(target.quitCh)
return nil
}
// NewMQTTTarget - creates new MQTT target.
func NewMQTTTarget(id string, args MQTTArgs, doneCh <-chan struct{}, loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{}), test bool) (*MQTTTarget, error) {
if args.MaxReconnectInterval == 0 {
// Default interval
// https://github.com/eclipse/paho.mqtt.golang/blob/master/options.go#L115
args.MaxReconnectInterval = 10 * time.Minute
}
options := mqtt.NewClientOptions().
SetClientID("").
SetCleanSession(true).
SetUsername(args.User).
SetPassword(args.Password).
SetMaxReconnectInterval(args.MaxReconnectInterval).
SetKeepAlive(args.KeepAlive).
SetTLSConfig(&tls.Config{RootCAs: args.RootCAs}).
AddBroker(args.Broker.String())
client := mqtt.NewClient(options)
target := &MQTTTarget{
id: event.TargetID{ID: id, Name: "mqtt"},
args: args,
client: client,
quitCh: make(chan struct{}),
loggerOnce: loggerOnce,
}
token := client.Connect()
retryRegister := func() {
for {
retry:
select {
case <-doneCh:
return
case <-target.quitCh:
return
default:
ok := token.WaitTimeout(reconnectInterval * time.Second)
if ok && token.Error() != nil {
target.loggerOnce(context.Background(),
fmt.Errorf("Previous connect failed with %w attempting a reconnect",
token.Error()),
target.ID())
time.Sleep(reconnectInterval * time.Second)
token = client.Connect()
goto retry
}
if ok {
// Successfully connected.
return
}
}
}
}
if args.QueueDir != "" {
queueDir := filepath.Join(args.QueueDir, storePrefix+"-mqtt-"+id)
target.store = NewQueueStore(queueDir, args.QueueLimit)
if err := target.store.Open(); err != nil {
target.loggerOnce(context.Background(), err, target.ID())
return target, err
}
if !test {
go retryRegister()
// 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)
}
} else {
if token.Wait() && token.Error() != nil {
return target, token.Error()
}
}
return target, nil
}