forked from edgexfoundry/app-functions-sdk-go
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
feat(triggers): Add MQTT Trigger with secure connection options
close #454 Signed-off-by: lenny <[email protected]>
- Loading branch information
lenny
committed
Sep 22, 2020
1 parent
a28a1e2
commit 5885ac0
Showing
8 changed files
with
757 additions
and
440 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,183 @@ | ||
| // | ||
| // Copyright (c) 2020 Intel Corporation | ||
| // | ||
| // 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 mqtt | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "net/url" | ||
| "sync" | ||
| "time" | ||
|
|
||
| pahoMqtt "github.com/eclipse/paho.mqtt.golang" | ||
| "github.com/edgexfoundry/go-mod-bootstrap/bootstrap" | ||
| "github.com/edgexfoundry/go-mod-core-contracts/clients" | ||
| "github.com/edgexfoundry/go-mod-messaging/pkg/types" | ||
| "github.com/google/uuid" | ||
|
|
||
| "github.com/edgexfoundry/app-functions-sdk-go/appcontext" | ||
| "github.com/edgexfoundry/app-functions-sdk-go/internal/common" | ||
| "github.com/edgexfoundry/app-functions-sdk-go/internal/runtime" | ||
| "github.com/edgexfoundry/app-functions-sdk-go/internal/security" | ||
| "github.com/edgexfoundry/app-functions-sdk-go/pkg/secure" | ||
| ) | ||
|
|
||
| // Trigger implements Trigger to support Triggers | ||
| type Trigger struct { | ||
| configuration *common.ConfigurationStruct | ||
| mqttClient pahoMqtt.Client | ||
| runtime *runtime.GolangRuntime | ||
| edgeXClients common.EdgeXClients | ||
| secretProvider security.SecretProvider | ||
| } | ||
|
|
||
| func NewTrigger( | ||
| configuration *common.ConfigurationStruct, | ||
| runtime *runtime.GolangRuntime, | ||
| clients common.EdgeXClients, | ||
| secretProvider security.SecretProvider) *Trigger { | ||
| return &Trigger{ | ||
| configuration: configuration, | ||
| runtime: runtime, | ||
| edgeXClients: clients, | ||
| secretProvider: secretProvider, | ||
| } | ||
| } | ||
|
|
||
| // Initialize initializes the Trigger for an external MQTT broker | ||
| func (trigger *Trigger) Initialize(_ *sync.WaitGroup, _ context.Context, background <-chan types.MessageEnvelope) (bootstrap.Deferred, error) { | ||
| // Convenience short cuts | ||
| logger := trigger.edgeXClients.LoggingClient | ||
| brokerConfig := trigger.configuration.MqttBroker | ||
| topic := trigger.configuration.Binding.SubscribeTopic | ||
|
|
||
| logger.Info("Initializing MQTT Trigger") | ||
|
|
||
| if background != nil { | ||
| return nil, errors.New("background publishing not supported for services using MQTT trigger") | ||
| } | ||
|
|
||
| if len(topic) == 0 { | ||
| return nil, fmt.Errorf("missing SubscribeTopic for MQTT Trigger. Must be present in [Binding] section.") | ||
| } | ||
|
|
||
| brokerUrl, err := url.Parse(brokerConfig.Url) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("invalid MQTT Broker Url '%s': %s", trigger.configuration.MqttBroker.Url, err.Error()) | ||
| } | ||
|
|
||
| opts := pahoMqtt.NewClientOptions() | ||
| opts.AutoReconnect = brokerConfig.AutoReconnect | ||
| opts.ClientID = brokerConfig.ClientId | ||
| if len(brokerConfig.ConnectTimeout) > 0 { | ||
| duration, err := time.ParseDuration(brokerConfig.ConnectTimeout) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("invalid MQTT ConnectTimeout '%s': %s", brokerConfig.ConnectTimeout, err.Error()) | ||
| } | ||
| opts.ConnectTimeout = duration | ||
| } | ||
| opts.KeepAlive = brokerConfig.KeepAlive | ||
| opts.Servers = []*url.URL{brokerUrl} | ||
|
|
||
| mqttFactory := secure.NewMqttFactory( | ||
| logger, | ||
| trigger.secretProvider, | ||
| brokerConfig.AuthMode, | ||
| brokerConfig.SecretPath, | ||
| brokerConfig.SkipCertVerify, | ||
| ) | ||
|
|
||
| mqttClient, err := mqttFactory.Create(opts) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("unable to create secure MQTT Client: %s", err.Error()) | ||
| } | ||
|
|
||
| logger.Info(fmt.Sprintf("Connecting to mqtt broker for MQTT trigger at: %s", brokerUrl)) | ||
|
|
||
| if token := mqttClient.Connect(); token.Wait() && token.Error() != nil { | ||
| return nil, fmt.Errorf("could not connect to broker for MQTT trigger: %s", token.Error().Error()) | ||
| } | ||
| logger.Info("Connected to mqtt server for MQTT trigger") | ||
|
|
||
| if token := mqttClient.Subscribe(topic, brokerConfig.QoS, trigger.messageHandler); token.Wait() && token.Error() != nil { | ||
| mqttClient.Disconnect(0) | ||
| return nil, fmt.Errorf("could not subscribe to topic '%s' for MQTT trigger: %s", topic, token.Error().Error()) | ||
| } | ||
|
|
||
| logger.Info(fmt.Sprintf("Subscribed to topic '%s' for MQTT trigger", topic)) | ||
|
|
||
| deferred := func() { | ||
| logger.Info("Disconnecting from broker for MQTT trigger") | ||
| trigger.mqttClient.Disconnect(0) | ||
| } | ||
|
|
||
| trigger.mqttClient = mqttClient | ||
|
|
||
| return deferred, nil | ||
| } | ||
|
|
||
| func (trigger *Trigger) messageHandler(client pahoMqtt.Client, message pahoMqtt.Message) { | ||
| // Convenience short cuts | ||
| logger := trigger.edgeXClients.LoggingClient | ||
| brokerConfig := trigger.configuration.MqttBroker | ||
| topic := trigger.configuration.Binding.PublishTopic | ||
|
|
||
| data := message.Payload() | ||
| contentType := clients.ContentTypeJSON | ||
| if data[0] != byte('{') { | ||
| // If not JSON then assume it is CBOR | ||
| contentType = clients.ContentTypeCBOR | ||
| } | ||
|
|
||
| correlationID := uuid.New().String() | ||
|
|
||
| edgexContext := &appcontext.Context{ | ||
| CorrelationID: correlationID, | ||
| Configuration: trigger.configuration, | ||
| LoggingClient: trigger.edgeXClients.LoggingClient, | ||
| EventClient: trigger.edgeXClients.EventClient, | ||
| ValueDescriptorClient: trigger.edgeXClients.ValueDescriptorClient, | ||
| CommandClient: trigger.edgeXClients.CommandClient, | ||
| NotificationsClient: trigger.edgeXClients.NotificationsClient, | ||
| } | ||
|
|
||
| logger.Trace("Received message from MQTT Trigger", clients.CorrelationHeader, correlationID) | ||
| logger.Debug(fmt.Sprintf("Received message from MQTT Trigger with %d bytes", len(data)), clients.ContentType, contentType) | ||
|
|
||
| envelope := types.MessageEnvelope{ | ||
| CorrelationID: correlationID, | ||
| ContentType: contentType, | ||
| Payload: data, | ||
| } | ||
|
|
||
| messageError := trigger.runtime.ProcessMessage(edgexContext, envelope) | ||
| if messageError != nil { | ||
| // ProcessMessage logs the error, so no need to log it here. | ||
| // ToDo: Do we want to publish the error back to the Broker? | ||
| return | ||
| } | ||
|
|
||
| if len(edgexContext.OutputData) > 0 && len(topic) > 0 { | ||
| if token := client.Publish(topic, brokerConfig.QoS, brokerConfig.Retain, edgexContext.OutputData); token.Wait() && token.Error() != nil { | ||
| logger.Error("could not publish to topic '%s' for MQTT trigger: %s", topic, token.Error().Error()) | ||
| } else { | ||
| logger.Trace("Sent MQTT Trigger response message", clients.CorrelationHeader, correlationID) | ||
| logger.Debug(fmt.Sprintf("Sent MQTT Trigger response message on topic '%s' with %d bytes", topic, len(edgexContext.OutputData))) | ||
| } | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.