save work, not yet working

.gitignore

@@ -1,2 +1,3 @@
 config.json
 src/udi/udi
+tmp/

Dockerfile

@@ -8,11 +8,7 @@ RUN go build -a -installsuffix nocgo -o udi .
 
 FROM scratch
 
-ENV MQTT_BROKER ""
-ENV MQTT_USERNAME ""
-ENV MQTT_PASSWORD ""
-ENV MQTT_ENABLE_TLS ""
-ENV MQTT_SUBSCRIBE_TOPICS ""
+ENV UDI_CONF ""
 
 COPY --from=builder /go/src/udi ./
 ENTRYPOINT ["./udi"]

src/udi/config/config.go

@@ -13,9 +13,9 @@ type ConfigT struct {
     TlsEnable string `json:"tlsEnable"`
   } `json:"mqtt"`
   TopicMappings []struct {
-    Topics []string `json:topics`
-    Handler string `json:handler`
-  } `json:"TopicMappings"`
+    Topics []string `json:"topics"`
+    Handler string `json:"handler"`
+  } `json:"topicMappings"`
   Handlers []struct {
     Name string `json:"name"`
     DatabaseConnStr string `json:"databaseConnStr"`

src/udi/config/example.json

@@ -0,0 +1,26 @@
+{
+	"mqtt": {
+		"broker": "172.23.1.102:1883",
+		"username": "",
+		"password": "",
+		"tlsEnable": "false"
+	},
+	"topicMappings": [
+		{
+			"topics": ["IoT/MBGW3/Measurement"],
+			"handler": "IoT"
+		}
+	],
+	"handlers": [
+		{
+			"name": "IoT",
+			"databaseConnStr": "",
+			"attributes": {
+			}
+		}
+	],
+	"archiver": {
+		"dir": "/mnt/udi/archive"
+	}
+}
+

src/udi/dispatcher/dispatcher.go

@@ -3,11 +3,20 @@ package dispatcher
 import "log"
 import "time"
 import "os"
+import "fmt"
+import "net/url"
+import "encoding/json"
 import "udi/mqtt"
 import "udi/config"
 import "udi/handlers/handler"
 import "udi/handlers/ttn"
+import "udi/handlers/iot"
 
+type archivingStruct struct {
+  timestamp string `json:"timestamp"`
+  topic string `json:"topic"`
+  payload string `json:"payload"`
+}
 
 var handlerMap map[string]handler.Handler = make(map[string]handler.Handler)
 var archiverChannel chan mqtt.Message = make(chan mqtt.Message, 100)
@@ -21,32 +30,56 @@ func InitDispatcher() {
     case "TTN":
       handlerMap[handlerEntry.Name] = ttn.NewTTNHandler()
       log.Printf("TTN initialized")
+    case "IoT":
+      handlerMap[handlerEntry.Name] = iot.NewIoTHandler()
+      log.Printf("IoT initialized")
     default:
       log.Fatalf("Handler %s not found", handlerEntry.Name)
     }
   }
 }
 
+func storeMessage(filename, item string) {
+  file, err := os.OpenFile(archivingFilename, os.O_APPEND | os.O_CREATE | os.O_WRONLY, 0644)
+  if err != nil {
+    log.Printf("Unable to open archiving file %s, message is not archived: %s", archivingFilename, err)
+    return
+  }
+  defer file.Close()
+  archivingString, err := json.Marshal(archivingItem)
+  if err != nil {
+    log.Printf("Unable to convert to json, message is not archived: %s", err)
+    return
+  }
+  _, err := file.WriteString(string(message.Payload))
+  if err != nil {
+    log.Printf("Unable to write message, message is not archived: %s", err)
+    return
+  }
+  log.Printf("Archiving message in file %s", archivingFilename)
+}
+
 func archiver() {
   archivingRootDir := config.Config.Archiver.Dir
-  currentArchivingDir := ""
-  lastArchivingDir := ""
+  var lastArchivingDir string
 
   for {
     select {
-    case _ = <- archiverChannel:
+    case message := <- archiverChannel:
       currentTime := time.Now()
-      currentDateStr := currentTime.Format("2006/01/02")
+      currentDateStr := currentTime.Format("2006/01/02/15")
       currentArchivingDir := archivingRootDir + "/" + currentDateStr
       if currentArchivingDir != lastArchivingDir {
         err := os.MkdirAll(currentArchivingDir, 0755)
-        if err := nil {
-          log.Printf("Unable to create archiving dir %s", currentArchivingDir)
+        if err != nil {
+          log.Printf("Unable to create archiving dir %s: %s", currentArchivingDir, err)
         }
         lastArchivingDir = currentArchivingDir
+	log.Printf("Archiving dir %s created", currentArchivingDir)
       }
-      archivingFilename := currentArchivingDir + "/" + string(currentTime.Hour()) + "/" 
-      log.Printf("Archiving message")
+      archivingFilename := fmt.Sprintf("%s/%s", currentArchivingDir, url.PathEscape(message.Topic))
+      archivingItem := archivingStruct { currentTime.Format("2006-01-02 15:04:05"), message.Topic, string(message.Payload) }
+      storeMessage(archivingFilename, archivingItem)
     }
   }
 }

src/udi/handlers/iot/iot.go

@@ -0,0 +1,23 @@
+package iot
+
+import "log"
+
+var idSeq int = 0
+
+type IoTHandler struct {
+  id int
+}
+
+func NewIoTHandler() *IoTHandler {
+  t := &IoTHandler {
+    id: idSeq,
+  }
+  idSeq += 1
+  return t
+}
+
+func (self *IoTHandler) Handle(topic, payload string) {
+  log.Printf("Handler IoT %d processing %s -> %s", self.id, topic, payload)
+}
+
+