handler stuff

src/udi/config/config.go

@@ -14,13 +14,13 @@ type ConfigT struct {
   } `json:"mqtt"`
   TopicMappings []struct {
     Topics []string `json:topics`
-    Plugin string `json:plugin`
+    Handler string `json:handler`
   } `json:"TopicMappings"`
-  Plugins []struct {
+  Handlers []struct {
     Name string `json:"name"`
     DatabaseConnStr string `json:"databaseConnStr"`
     Attributes map[string]string `json:"attributes"`
-  } `json:"plugins"`
+  } `json:"handlers"`
 }
 
 var Config ConfigT

src/udi/dispatcher/dispatcher.go

@@ -3,8 +3,26 @@ package dispatcher
 import "log"
 import "udi/mqtt"
 import "udi/config"
+import "udi/handlers/handler"
+import "udi/handlers/ttn"
 
 
+var handlerMap map[string]handler.Handler = make(map[string]handler.Handler)
+
+func InitDispatcher() {
+  log.Printf("Initializing dispatcher")
+  for _, handlerEntry := range config.Config.Handlers {
+    log.Printf("Trying %s", handlerEntry.Name)
+    switch handlerEntry.Name {
+    case "TTN":
+      handlerMap[handlerEntry.Name] = ttn.NewTTNHandler()
+      log.Printf("TTN initialized")
+    default:
+      log.Fatalf("Handler %s not found", handlerEntry.Name)
+    }
+  }
+}
+
 func InputDispatcher() {
   for {
     select {
@@ -12,11 +30,13 @@ func InputDispatcher() {
       log.Printf("Message arrived in inputDispatcher, topic: %s, payload: %s\n", message.Topic, message.Payload)
 
       for _, mapping := range config.Config.TopicMappings {
-        log.Printf("Testing %s -> %s", mapping.Topics, mapping.Plugin)
+        log.Printf("Testing %s -> %s", mapping.Topics, mapping.Handler)
         for _, subscribedTopic := range mapping.Topics {
           log.Printf("Testing %s in %s", message.Topic, subscribedTopic)
           if mqtt.TopicMatchesSubscription(message.Topic, subscribedTopic) {
-            log.Printf("Handle message in plugin %s", mapping.Plugin)
+            log.Printf("Handle message in handler %s", mapping.Handler)
+            handler := handlerMap[mapping.Handler]
+            handler.Handle(message.Topic, string(message.Payload))
           } else {
             log.Printf("no match")
           }

src/udi/handlers/handler/handler.go

@@ -0,0 +1,6 @@
+package handler
+
+type Handler interface {
+  Handle(string, string)
+}
+

src/udi/handlers/ttn/ttn.go

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

src/udi/main.go

@@ -17,6 +17,7 @@ func main() {
 
   config.LoadConfiguration()
 
+  dispatcher.InitDispatcher()
   go dispatcher.InputDispatcher()
 
   mqtt.StartMqttClient()