Error Management in Flutter

Sources/dafl_project_flutter/lib/position/location.dart

@@ -36,8 +36,18 @@ class Location {
       "id": actualUser,
     });
     var data = jsonDecode(response.body);
-    data.forEach((s)=> spot.putIfAbsent(s['user'], () => s['music']));
-    return spot;
+    if (data.runtimeType==String) {
+      if (data=="Failed to connect to MySQL, connection timeout"){
+        return Future.error("Failed to connect to MySQL, connection timeout");
+      }else if (data=="The POST didn't return any values"){
+        return Future.error("POST method failed");
+      }else{
+        return Future.error("Can't find current user in the database");
+      }
+    }else {
+      data.forEach((s) => spot.putIfAbsent(s['user'], () => s['music']));
+      return spot;
+    }
   }
 }
 

Sources/php_script/script/distance.php

@@ -16,7 +16,7 @@ function meters($lat1, $lng1, $lat2, $lng2): float
 $connect="";                                                                    //Else PHP send an error, "connect don't exist", but that work anyway, this is just to remove a fake error
 $res=include "config.php";                                                      //$res get the result of the calling of "config.php"
 if ($res != 1){                                                                 //Check if config.php work
-    print (json_encode("Failed to connect to MySQL"));                    //Return a json string, so the dart script can interpret the error
+    print (json_encode("Failed to connect to MySQL, connection timeout"));                    //Return a json string, so the dart script can interpret the error
 }
 if (!empty($_POST)) {
     $id = $_POST['id'];                                                             //Get the result of the POST method in id

Sources/php_script/script/insert.php

@@ -2,7 +2,7 @@
 $connect="";                                                                    //Else PHP send an error, "connect don't exist", but that work anyway, this is just to remove a fake error
 $res=include "config.php";                                                      //$res get the result of the calling of "config.php"
 if ($res != 1){                                                                 //Check if config.php work
-    print (json_encode("Failed to connect to MySQL"));                    //Return a json string, so the dart script can interpret the error
+    print (json_encode("Failed to connect to MySQL, connection timeout"));                    //Return a json string, so the dart script can interpret the error
 }
 if (!empty($_POST)) {                                                           //Check if the method POST return something
     $id = mysqli_real_escape_string($connect, $_POST['id']);                    //Get the result of POST method