Added docker2mqtt

.github/workflows/build.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        repository: [restic-auto, telegraf, piwigo-souvenirs]
+        repository: [restic-auto, telegraf, piwigo-souvenirs, docker2mqtt]
 
     steps:
       - name: Checkout

docker2mqtt/Dockerfile

@@ -0,0 +1,15 @@
+FROM golang:alpine AS builder
+
+WORKDIR $GOPATH/src/napnap75/docker2mqtt/
+
+COPY docker2mqtt.go .
+
+RUN apk add --no-cache git gcc musl-dev \
+	&& go mod init github.com/napnap75/multiarch-docker-images/docker2mqtt \
+	&& go get -d -v \
+	&& go build -ldflags="-w -s" -o /go/bin/docker2mqtt
+
+FROM alpine:latest
+
+COPY --from=builder /go/bin/docker2mqtt /usr/bin/
+ENTRYPOINT ["/usr/bin/docker2mqtt"]

docker2mqtt/docker2mqtt.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"os"
+	"os/signal"
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/client"
+	"github.com/eclipse/paho.mqtt.golang"
+)
+
+func main() {
+	// Handle interrupts to clean properly
+	c := make(chan os.Signal)
+	signal.Notify(c, os.Interrupt)
+	go func() {
+		select {
+			case sig := <-c:
+				fmt.Printf("Got %s signal. Aborting...\n", sig)
+				os.Exit(1)
+		}
+	}()
+
+	// Load the parameters
+	var mqttServer = flag.String("mqtt-server", "tcp://localhost:1883", "The URL of the MQTT server to connecto to")
+	var mqttTopic = flag.String("mqtt-topic", "docker/events", "The MQTT topice to send the events to")
+	flag.Parse()
+
+	// Connect to the docker socket
+	cli, err := client.NewClientWithOpts(client.FromEnv)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Unable to connect to docker: %v\n", err)
+		return
+	}
+	ctx, _ := context.WithCancel(context.Background())
+
+	// Connect to the MQTT server
+        opts := mqtt.NewClientOptions().AddBroker(*mqttServer)
+        client := mqtt.NewClient(opts)
+        if token := client.Connect(); token.Wait() && token.Error() != nil {
+		fmt.Fprintf(os.Stderr, "Unable to connect to docker: %v\n", token.Error())
+		return
+        }
+
+	// Listen for events
+	msgs, errs := cli.Events(ctx, types.EventsOptions{})
+	for {
+		select {
+			case err := <- errs:
+				fmt.Fprintf(os.Stderr, "Error while listening for docker events: %v\n", err)
+
+			case msg := <-msgs:
+				client.Publish(*mqttTopic, 0, false, fmt.Sprintf("{ \"time\": %d, \"type\": \"%s\", \"name\": \"%s\", \"action\": \"%s\"}\n", msg.Time, msg.Type, msg.Actor.Attributes["name"], msg.Action))
+		}
+	}
+}