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/*
Copyright 2020 The KubeEdge Authors.
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 mappercommon
import (
"crypto/tls"
"encoding/json"
"time"
mqtt "github.com/eclipse/paho.mqtt.golang"
)
// Joint the topic like topic := fmt.Sprintf(TopicTwinUpdateDelta, deviceID)
const (
TopicTwinUpdateDelta = "$hw/events/device/%s/twin/update/delta"
TopicTwinUpdate = "$hw/events/device/%s/twin/update"
TopicStateUpdate = "$hw/events/device/%s/state/update"
TopicDataUpdate = "$ke/events/device/%s/data/update"
)
// MqttClient is parameters for Mqtt client.
type MqttClient struct {
Qos byte
Retained bool
IP string
User string
Passwd string
Cert string
PrivateKey string
Client mqtt.Client
}
// newTLSConfig new TLS configuration.
// Only one side check. Mqtt broker check the cert from client.
func newTLSConfig(certfile string, privateKey string) (*tls.Config, error) {
// Import client certificate/key pair
cert, err := tls.LoadX509KeyPair(certfile, privateKey)
if err != nil {
return nil, err
}
// Create tls.Config with desired tls properties
return &tls.Config{
// ClientAuth = whether to request cert from server.
// Since the server is set up for SSL, this happens
// anyways.
ClientAuth: tls.NoClientCert,
// ClientCAs = certs used to validate client cert.
ClientCAs: nil,
// InsecureSkipVerify = verify that cert contents
// match server. IP matches what is in cert etc.
InsecureSkipVerify: true,
// Certificates = list of certs client sends to server.
Certificates: []tls.Certificate{cert},
}, nil
}
// Connect connect to the Mqtt server.
func (mc *MqttClient) Connect() error {
opts := mqtt.NewClientOptions().AddBroker(mc.IP).SetClientID("").SetCleanSession(true)
if mc.Cert != "" {
tlsConfig, err := newTLSConfig(mc.Cert, mc.PrivateKey)
if err != nil {
return err
}
opts.SetTLSConfig(tlsConfig)
} else {
opts.SetUsername(mc.User)
opts.SetPassword(mc.Passwd)
}
mc.Client = mqtt.NewClient(opts)
// The token is used to indicate when actions have completed.
if tc := mc.Client.Connect(); tc.Wait() && tc.Error() != nil {
return tc.Error()
}
mc.Qos = 0 // At most 1 time
mc.Retained = false // Not retained
return nil
}
// Publish publish Mqtt message.
func (mc *MqttClient) Publish(topic string, payload interface{}) error {
if tc := mc.Client.Publish(topic, mc.Qos, mc.Retained, payload); tc.Wait() && tc.Error() != nil {
return tc.Error()
}
return nil
}
// Subscribe subsribe a Mqtt topic.
func (mc *MqttClient) Subscribe(topic string, onMessage mqtt.MessageHandler) error {
if tc := mc.Client.Subscribe(topic, mc.Qos, onMessage); tc.Wait() && tc.Error() != nil {
return tc.Error()
}
return nil
}
// getTimestamp get current timestamp.
func getTimestamp() int64 {
return time.Now().UnixNano() / 1e6
}
// CreateMessageTwinUpdate create twin update message.
func CreateMessageTwinUpdate(name string, valueType string, value string) (msg []byte, err error) {
var updateMsg DeviceTwinUpdate
updateMsg.BaseMessage.Timestamp = getTimestamp()
updateMsg.Twin = map[string]*MsgTwin{}
updateMsg.Twin[name] = &MsgTwin{}
updateMsg.Twin[name].Actual = &TwinValue{Value: &value}
updateMsg.Twin[name].Metadata = &TypeMetadata{Type: valueType}
msg, err = json.Marshal(updateMsg)
return
}
// CreateMessageData create data message.
func CreateMessageData(name string, valueType string, value string) (msg []byte, err error) {
var dataMsg DeviceData
dataMsg.BaseMessage.Timestamp = getTimestamp()
dataMsg.Data = map[string]*DataValue{}
dataMsg.Data[name] = &DataValue{}
dataMsg.Data[name].Value = value
dataMsg.Data[name].Metadata.Type = valueType
dataMsg.Data[name].Metadata.Timestamp = getTimestamp()
msg, err = json.Marshal(dataMsg)
return
}
// CreateMessageState create device status message.
func CreateMessageState(state string) (msg []byte, err error) {
var stateMsg DeviceUpdate
stateMsg.BaseMessage.Timestamp = getTimestamp()
stateMsg.State = state
msg, err = json.Marshal(stateMsg)
return
}
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