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* imp mqtt source * package installs * format * fix mqtt sending * del debug stm * add boiler template * update codegent * rename vars, handle errors * format
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| Copyright 2024 The Knative 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 main | ||
|
|
||
| import ( | ||
| "context" | ||
| "flag" | ||
| "log" | ||
| "net" | ||
| "os" | ||
|
|
||
| mqttv2 "github.com/cloudevents/sdk-go/protocol/mqtt_paho/v2" | ||
| cloudevents "github.com/cloudevents/sdk-go/v2" | ||
| "github.com/eclipse/paho.golang/paho" | ||
| ) | ||
|
|
||
| var ( | ||
| sink string | ||
| source string | ||
|
|
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| // CloudEvents specific parameters | ||
| eventSource string | ||
|
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| topic string | ||
| clientid string | ||
| ) | ||
|
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| func init() { | ||
| flag.StringVar(&sink, "sink", "", "the host url to send messages to") | ||
| flag.StringVar(&source, "source", "", "the url to get messages from") | ||
| flag.StringVar(&eventSource, "eventSource", "", "the event-source (CloudEvents)") | ||
|
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| flag.StringVar(&topic, "topic", "mqtt-topic", "MQTT topic subscribe to") | ||
| flag.StringVar(&clientid, "clientid", "receiver-client-id", "MQTT source client id") | ||
| } | ||
|
|
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| func main() { | ||
| flag.Parse() | ||
|
|
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| kSink := os.Getenv("K_SINK") | ||
| if kSink != "" { | ||
| sink = kSink | ||
| } | ||
|
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| // "source" flag must not be empty for operation. | ||
| if source == "" { | ||
| log.Fatal("A valid MQTT broker URL must be defined.") | ||
| } | ||
|
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| // The event's source defaults to the MQTT broker URL. | ||
| if eventSource == "" { | ||
| eventSource = source | ||
| } | ||
|
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| ctx := cloudevents.ContextWithTarget(context.Background(), sink) | ||
|
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| conn, err := net.Dial("tcp", source) | ||
| if err != nil { | ||
| log.Fatalf("failed to connect to MQTT broker: %s", err.Error()) | ||
| } | ||
|
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| config := &paho.ClientConfig{ | ||
| ClientID: clientid, | ||
| Conn: conn, | ||
| } | ||
|
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| subscribeOpt := &paho.Subscribe{ | ||
| Subscriptions: []paho.SubscribeOptions{ | ||
| {Topic: topic, | ||
| QoS: 0}, | ||
| }, | ||
| } | ||
|
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| mqttReceiver, err := mqttv2.New(ctx, config, mqttv2.WithSubscribe(subscribeOpt)) | ||
| if err != nil { | ||
| log.Fatalf("failed to create protocol: %s", err.Error()) | ||
| } | ||
| defer mqttReceiver.Close(ctx) | ||
|
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| ceReceiver, err := cloudevents.NewClient(mqttReceiver) | ||
| if err != nil { | ||
| log.Fatalf("failed to create client: %v", err) | ||
| } | ||
|
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| ceClient, err := cloudevents.NewClientHTTP() | ||
| if err != nil { | ||
| log.Fatalf("Failed to create a http cloudevent client: %s", err.Error()) | ||
| } | ||
|
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| log.Printf("MQTT source start consuming messages from %s\n", source) | ||
| err = ceReceiver.StartReceiver(ctx, func(ctx context.Context, event cloudevents.Event) { | ||
| receive(ctx, event, ceClient) | ||
| }) | ||
| if err != nil { | ||
| log.Fatalf("failed to start receiver: %s", err) | ||
| } else { | ||
| log.Printf("MQTT source stopped\n") | ||
| } | ||
|
|
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| } | ||
|
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| func receive(ctx context.Context, event cloudevents.Event, c cloudevents.Client) { | ||
| log.Printf("Received event: %s", event) | ||
| data := event.Data() | ||
| newEvent := cloudevents.NewEvent(cloudevents.VersionV1) | ||
| newEvent.SetType(event.Type()) | ||
| newEvent.SetSource(eventSource) | ||
| newEvent.SetID(event.ID()) | ||
| err := newEvent.SetData(cloudevents.ApplicationJSON, data) | ||
| if err != nil { | ||
| log.Printf("Error setting event data: %v", err) | ||
| return | ||
| } | ||
| if result := c.Send(ctx, newEvent); !cloudevents.IsACK(result) { | ||
| log.Printf("Sending event to sink failed: %v", result) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| # Copyright 2021 The Knative 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. | ||
|
|
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| # This is a very simple Knative Eventing Source that receive messages | ||
| # from MQTT brokers and send to sink as Cloudevents | ||
| apiVersion: sources.knative.dev/v1 | ||
| kind: ContainerSource | ||
| metadata: | ||
| name: mqttsource | ||
| spec: | ||
| template: | ||
| spec: | ||
| containers: | ||
| - image: ko://knative.dev/eventing/cmd/mqttsource | ||
| securityContext: | ||
| allowPrivilegeEscalation: false | ||
| readOnlyRootFilesystem: true | ||
| runAsNonRoot: true | ||
| capabilities: | ||
| drop: | ||
| - ALL | ||
| seccompProfile: | ||
| type: RuntimeDefault | ||
|
|
||
| sink: | ||
| ref: | ||
| apiVersion: serving.knative.dev/v1 | ||
| kind: Service | ||
| name: event-display |
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