Load config from DB

lib/db.js

@@ -21,6 +21,7 @@
 const mongodb = require("mongodb");
 const config = require("./config");
 const common = require("./common");
+const expressionParser = require("./common/expression-parser");
 
 let tasksCollection,
   devicesCollection,
@@ -30,7 +31,8 @@ let tasksCollection,
   virtualParametersCollection,
   faultsCollection,
   filesCollection,
-  operationsCollection;
+  operationsCollection,
+  configCollection;
 
 function connect(callback) {
   mongodb.MongoClient.connect(
@@ -58,6 +60,7 @@ function connect(callback) {
       exports.operationsCollection = operationsCollection = db.collection(
         "operations"
       );
+      configCollection = db.collection("config");
 
       callback();
     }
@@ -873,6 +876,20 @@ function getFiles(callback) {
   filesCollection.find().toArray(callback);
 }
 
+function getConfig(callback) {
+  configCollection.find().toArray((err, res) => {
+    if (err) return void callback(err);
+
+    callback(
+      null,
+      res.map(c => ({
+        id: c["_id"],
+        value: expressionParser.parse(c["value"])
+      }))
+    );
+  });
+}
+
 exports.connect = connect;
 exports.disconnect = disconnect;
 exports.fetchDevice = fetchDevice;
@@ -890,3 +907,4 @@ exports.getVirtualParameters = getVirtualParameters;
 exports.getFiles = getFiles;
 exports.getDueTasks = getDueTasks;
 exports.getOperations = getOperations;
+exports.getConfig = getConfig;