added on nodes for rtdb and firestore andmade nodes pass through msg objects with as little changes as possible

rtdb/rtdb-get.js

@@ -1,6 +1,5 @@
 
-
-let oldpath
+let msgin
 
 module.exports = function(RED) {
 
@@ -9,20 +8,31 @@ module.exports = function(RED) {
     var node = this;
 
     const cb = (res)=>{
-      console.log('firebase get result '+res)
+      console.log('firebase rtdb-get result '+res)
       //console.dir(res)
       let val = res.val()
-      console.dir(val)
-      node.send({payload:val})
+      //console.dir(val)
+      if(msgin){
+        msgin.payload = val
+        node.send(msgin)
+      } else {
+        node.send({payload: val})
+      }
     }
 
     let setUpListener = (path)=>{
-      console.log('rtdb-get setUpListener for path '+path)
-      if(oldpath){
-        this.admin.database().ref(oldpath).off('value', cb)
+      console.log('* rtdb-get setUpListener for path '+path)
+      if(path){
+        this.admin.database().ref(path).once('value').then((res)=>{
+          cb(res)
+        }, (fail)=>{
+          console.log('rtdb-get failure ')
+          console.dir(fail)
+        })
+      }  else {
+        console.log('----- rtdb-get got empty path !!')
+        console.dir(config)
       }
-      this.admin.database().ref(path).on('value', cb)
-      oldpath = path
     }
 
     if(config.cred){
@@ -43,11 +53,11 @@ module.exports = function(RED) {
       let path = this.path
       if(msg && msg.payload){
         path = msg.payload.path
+        msgin = msg
         setUpListener(path)
       }
     }.bind(this));
 
-    setUpListener(this.path)
 
   }
   RED.nodes.registerType("rtdb-get", FirebaseAdmin);