mirror of
https://github.com/minio/minio.git
synced 2024-12-27 15:45:55 -05:00
268 lines
7.4 KiB
Go
268 lines
7.4 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2018-2019 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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"context"
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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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"fmt"
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"net/url"
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"os"
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"path/filepath"
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"time"
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mqtt "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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reconnectInterval = 5 // In Seconds
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storePrefix = "minio"
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)
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// MQTT input constants
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const (
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MqttBroker = "broker"
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MqttTopic = "topic"
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MqttQoS = "qos"
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MqttUsername = "username"
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MqttPassword = "password"
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MqttReconnectInterval = "reconnect_interval"
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MqttKeepAliveInterval = "keep_alive_interval"
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MqttQueueDir = "queue_dir"
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MqttQueueLimit = "queue_limit"
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EnvMQTTState = "MINIO_NOTIFY_MQTT_STATE"
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EnvMQTTBroker = "MINIO_NOTIFY_MQTT_BROKER"
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EnvMQTTTopic = "MINIO_NOTIFY_MQTT_TOPIC"
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EnvMQTTQoS = "MINIO_NOTIFY_MQTT_QOS"
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EnvMQTTUsername = "MINIO_NOTIFY_MQTT_USERNAME"
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EnvMQTTPassword = "MINIO_NOTIFY_MQTT_PASSWORD"
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EnvMQTTReconnectInterval = "MINIO_NOTIFY_MQTT_RECONNECT_INTERVAL"
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EnvMQTTKeepAliveInterval = "MINIO_NOTIFY_MQTT_KEEP_ALIVE_INTERVAL"
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EnvMQTTQueueDir = "MINIO_NOTIFY_MQTT_QUEUE_DIR"
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EnvMQTTQueueLimit = "MINIO_NOTIFY_MQTT_QUEUE_LIMIT"
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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 uint64 `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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if m.QueueLimit > 10000 {
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return errors.New("queueLimit should not exceed 10000")
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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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quitCh chan struct{}
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loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{})
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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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// send - sends an event to the mqtt.
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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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if !token.WaitTimeout(reconnectInterval * time.Second) {
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return errNotConnected
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}
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return token.Error()
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}
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// Send - reads an event from store and sends it to MQTT.
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func (target *MQTTTarget) Send(eventKey string) error {
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// Do not send if the connection is not active.
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if !target.client.IsConnectionOpen() {
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return errNotConnected
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}
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eventData, err := target.store.Get(eventKey)
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if err != nil {
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// The last event key in a successful batch will be sent in the channel atmost once by the replayEvents()
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// Such events will not exist and wouldve been already been sent successfully.
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if os.IsNotExist(err) {
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return nil
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}
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return err
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}
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if err = target.send(eventData); err != nil {
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return err
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}
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// Delete the event from store.
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return target.store.Del(eventKey)
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}
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// Save - saves the events to the store if queuestore is configured, which will
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// be replayed when the mqtt connection is active.
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func (target *MQTTTarget) Save(eventData event.Event) error {
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if target.store != nil {
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return target.store.Put(eventData)
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}
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// Do not send if the connection is not active.
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if !target.client.IsConnectionOpen() {
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return errNotConnected
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}
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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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target.client.Disconnect(100)
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close(target.quitCh)
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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, doneCh <-chan struct{}, loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{})) (*MQTTTarget, error) {
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if args.MaxReconnectInterval == 0 {
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// Default interval
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// https://github.com/eclipse/paho.mqtt.golang/blob/master/options.go#L115
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args.MaxReconnectInterval = 10 * time.Minute
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}
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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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client := mqtt.NewClient(options)
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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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quitCh: make(chan struct{}),
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loggerOnce: loggerOnce,
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}
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token := client.Connect()
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retryRegister := func() {
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for {
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retry:
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select {
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case <-doneCh:
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return
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case <-target.quitCh:
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return
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default:
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ok := token.WaitTimeout(reconnectInterval * time.Second)
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if ok && token.Error() != nil {
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target.loggerOnce(context.Background(),
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fmt.Errorf("Previous connect failed with %w attempting a reconnect",
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token.Error()),
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target.ID())
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time.Sleep(reconnectInterval * time.Second)
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token = client.Connect()
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goto retry
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}
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if ok {
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// Successfully connected.
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return
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}
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}
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}
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}
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if args.QueueDir != "" {
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queueDir := filepath.Join(args.QueueDir, storePrefix+"-mqtt-"+id)
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target.store = NewQueueStore(queueDir, args.QueueLimit)
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if err := target.store.Open(); err != nil {
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return nil, err
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}
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go retryRegister()
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// Replays the events from the store.
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eventKeyCh := replayEvents(target.store, doneCh, loggerOnce, target.ID())
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// Start replaying events from the store.
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go sendEvents(target, eventKeyCh, doneCh, loggerOnce)
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} else {
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if token.Wait() && token.Error() != nil {
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return nil, token.Error()
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}
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}
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return target, nil
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}
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