Error handling for DB

api/controller.js

@@ -27,6 +27,7 @@ class Controller {
 
       // TODO: handle subscriptions to particular events
 
+      try {
         const subscriber = await Subscribers.findOne({
           dappId,
           address
@@ -68,7 +69,9 @@ class Controller {
             token: t.token
           });
         }
-
+      } catch (err) {
+        return next(err);
+      }
       return res.status(200).send("OK");
     };
   }
@@ -96,10 +99,14 @@ class Controller {
 
       // TODO: handle unsubscribe to particular events
 
+      try {
         await Subscribers.deleteOne({
           dappId,
           address
         });
+      } catch (err) {
+        return next(err);
+      }
 
       return res.status(200).send("OK");
     };
@@ -116,6 +123,7 @@ class Controller {
         return next(new BadRequest(errors.array()));
       }
 
+      try {
         const verification = await Verifications.findOne({
           token
         }).populate("subscriber");
@@ -136,6 +144,9 @@ class Controller {
         } else {
           return next(new BadRequest("Invalid verification token"));
         }
+      } catch (err) {
+        return next(err);
+      }
 
       return res.status(200).send("OK");
     };
@@ -152,6 +163,7 @@ class Controller {
         return next(new BadRequest(errors.array()));
       }
 
+      try {
         const subscriber = await Subscribers.findOne({
           dappId,
           address,
@@ -159,6 +171,9 @@ class Controller {
         });
 
         return res.status(200).json({ isUser: subscriber ? true : false });
+      } catch (err) {
+        return next(err);
+      }
     };
   }
 }

api/index.js

@@ -39,6 +39,9 @@ events.on("db:connected", () => {
     const response = { error: err.message };
     if (err instanceof BadRequest && err.details) {
       response.details = err.details;
+    } else {
+      console.error(err);
+      response.error = "Service unavailable";
     }
     res.status(err.statusCode).json(response);
   });