Problem: SendQueryAsync no response

[masouri]

trafficstars

Problem

As the title suggestest i send a graphql request, i do this in 3 different situations but in one of those the method SendQueryAsync just stops without any errors(tried try catch and breakpoints).

####Details I have one Class to do this request, i use it mutliple times, but in one case it doesn't work and i have no idea why, or how to debbug it.

There is nothing noticable in the Stacktrace aswell as far as im concerned

###This is my Code

using GermanFishing.Model.GraphQLImages;
using GraphQL.Client.Http;
using GraphQL.Client.Serializer.Newtonsoft;
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace GermanFishing.ViewModel
{
    public  class UserViewModel
    {

        public User user_profile { get; set; }

        public UserViewModel()
        {

            user_profile = new User();

        }


        //Consume User Data from Graphql
        public async Task GetProfileData()
        {
            var client = new GraphQLHttpClient(new GraphQLHttpClientOptions
            {
                EndPoint = new Uri("https://www.german-fishing.de/graphql"),

            }, new NewtonsoftJsonSerializer());


            client.HttpClient.DefaultRequestHeaders.Add("Authorization", "Bearer " + Convert.ToString(Application.Current.Properties["Login"]));

            var request = new GraphQLHttpRequest
            {
                Query = @"
                           query {
                                  me {
                                    name
                                    unreadNotifications {
                                      data
                                    }
                                    abonnements {
                                      id
                                      place {
                                        id
                                        name
                                      }
                                    }
                                  }
                                }"
            };

            var response = await client.SendQueryAsync<UserImage>(request).ConfigureAwait(false);

            this.user_profile = response.Data.me;
            


        }

    }
}

Any suggestions how to approach this ?

[sungam3r]

Can you turn on / check logs on the server side?

[masouri]

Can you turn on / check logs on the server side?

This is where it gets wacky, server gets a post request returns a 200 code, nothing weird or irregular happening there

[masouri]

###Additional Information it could be that im in an Async Deadlock here is the Code where i acctually call it

using GermanFishing.ViewModel;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace GermanFishing.ViewModel.Authentication
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class Authentification 
    {
        public Authentification()
        { 
                
        }
        public bool Auth()
        {

            if (IsLoggedIn() && KeyActive())
            {
                return true;
            }
            else
            {
                return false;
            }
        }


        private bool IsLoggedIn()
        {
            bool is_logged_in = Application.Current.Properties.ContainsKey("IsLoggedIn") ? Convert.ToBoolean(Application.Current.Properties["IsLoggedIn"]) : false;

            return is_logged_in;
        }
        private bool KeyActive()
        {
            UserViewModel user_view_model = new UserViewModel();

            Task task = user_view_model.GetProfileData();

            task.Wait();

            if (user_view_model.user_profile == null)
            {
                return false;
            }
            return true;

        }
      
    }

    
}

[ognjensuvakov]

Same thing here, after calling SendQueryAsync synchronously with ".Result" on Task nothing happens, no logs no errors.

[ds1709]

I can PR fix of this.

[ds1709]

@masouri assumes one of your GetProfileData calls (which is deadlocked) is from contextual thread (GUI or HttpContext), and you call it like GetProfileData().Result. If so, you're in same problem with @ognjensuvakov. I got same problem by calling SendQueryAsync<...>(...).Result from GUI thread (WinForms). As a temporary workaround, you can try to wrap SendQueryAsync into Task.Run call like this:

var response = Task.Run(async () => await client.SendQueryAsync<UserImage>(request)).Result;

It will call SendQueryAsync on thread pool and will not capture the synchronization context, so you can avoid deadlock.