[![I am unable to pass data of collection and document from android project to PCL,the way I tried threw null reference exception please help me with that.
Thanks
Android project to get data
FirestoreDb firestore = FirestoreDb.Create("iyf-raipur");
public async Task<IEnumerable<T>> GetCouncelorsAsync()
{
Query preachers = firestore.Collection(nameof(T));
QuerySnapshot snapshots = await preachers.GetSnapshotAsync();
foreach(DocumentSnapshot documentSnapshot in snapshots.Documents)
{
T data = documentSnapshot.ConvertTo<T>();
System.Console.WriteLine();
}
return (IEnumerable<T>)preachers;
}
PCL ViewModel Code
private ObservableCollection<Preacher> preachers;
private IRepository<Preacher> _repository = DependencyService.Get<IRepository<Preacher>>();
public PreacherViewModel()
{
Preachers = new ObservableCollection<Preacher>();
PopulatePreachers();
}
async void PopulatePreachers()
{
try
{
var list = await _repository.GetPreachersAsync();
foreach (var preacher in list)
{
Preachers.Add(preacher);
name = preacher.Name;
email = preacher.Email;
}
}
catch (Exception ex)
{
await Shell.Current.DisplayAlert("ERROR", ex.Message, "ok");
}
}
Related
I have an app that uses CosmosDb as the database and using AspNetIdentityDocument. When I call var result = await _signInManager.PasswordSignInAsync(model.UserName, model.Password, model.RememberMe, false), i get the error Cross partition query is required but disabled. Please set x-ms-documentdb-query-enablecrosspartition to true, specify x-ms-documentdb-partitionkey
void InitializeDocumentClient(DocumentClient client) code attempts to create the container if not there. It works for the creating the container on my CossmosDb emultated store but fails on the Azure store requiring a partition key! My app works on the emulated store!
Program.cs
builder.Services.AddDefaultDocumentClientForIdentity(
builder.Configuration.GetValue<Uri>("DocumentDbClient:EndpointUri"),
builder.Configuration.GetValue<string>("DocumentDbClient:AuthorizationKey"),
afterCreation: InitializeDocumentClient);
builder.Services.AddIdentity<ApplicationUser, DocumentDbIdentityRole>()
.AddDocumentDbStores(options =>
{
options.UserStoreDocumentCollection = "AspNetIdentity";
options.Database = "RNPbooking";
})
.AddDefaultTokenProviders();
void InitializeDocumentClient(DocumentClient client)
{
try
{
var db = client.ReadDatabaseAsync(UriFactory.CreateDatabaseUri("RNPbooking")).Result;
}
catch (AggregateException ae)
{
ae.Handle(ex =>
{
if (ex.GetType() == typeof(DocumentClientException) && ((DocumentClientException)ex).StatusCode == HttpStatusCode.NotFound)
{
var db = client.CreateDatabaseAsync(new Microsoft.Azure.Documents.Database() { Id = "RNPbooking" }).Result;
return true;
}
return false;
});
}
try
{
var collection = client.ReadDocumentCollectionAsync(UriFactory.CreateDocumentCollectionUri("RNPbooking", "AspNetIdentity")).Result;
}
catch (AggregateException ae)
{
ae.Handle(ex =>
{
if (ex.GetType() == typeof(DocumentClientException) && ((DocumentClientException)ex).StatusCode == HttpStatusCode.NotFound)
{
DocumentCollection collection = new DocumentCollection()
{
Id = "AspNetIdentity"
};
collection = client.CreateDocumentCollectionAsync(UriFactory.CreateDatabaseUri("RNPbooking"),collection).Result;
return true;
}
return false;
});
}
}
Controller
[Authorize(Roles = "Admin)]
public class AdminController : Controller
{
private readonly UserManager<ApplicationUser> _userManager;
private readonly SignInManager<ApplicationUser> _signInManager;
public CosmosClient _client;
public AdminController(
UserManager<ApplicationUser> userManager,
SignInManager<ApplicationUser> signInManager,
)
{
_userManager = userManager;
_signInManager = signInManager;
}
You need to fill in CreateDocumentCollectionUri method with FeedOptions object as a parameter
UriFactory.CreateDocumentCollectionUri(DatabaseId, CollectionId),new FeedOptions { EnableCrossPartitionQuery=true})
UPDATED: From the code examples, you seem to be using this library https://github.com/codekoenig/AspNetCore.Identity.DocumentDb, AspNetCore.Identity.DocumentDb.
This error means the library you are using is performing a Document Query in their code at some point, it is not related to the creation of the Database or Collection.
The library code must be using CreateDocumentQuery somewhere, that code is missing:
new FeedOptions { EnableCrossPartitionQuery = true };
If you search their code base, you will see multiple scenarios like that: https://github.com/codekoenig/AspNetCore.Identity.DocumentDb/search?q=CreateDocumentQuery
Because this code is out of your control, you should try and contact the owner to see if this is a fix they can do on their end. The code for the library doesn't seem to have been updated in several years, so maybe this library is not maintained?
I am trying to catch and format the exception thrown by the resource filter but getting this error. The middleware is working for exceptions thrown from controller level but getting this - "System.InvalidOperationException: Headers are read-only, response has already started" error while trying to write to the response in case of resource level errors.
Code of my Resource Filter:
public class TestingAsyncResourceFilter : IAsyncResourceFilter
{
public async Task OnResourceExecutionAsync(ResourceExecutingContext context, ResourceExecutionDelegate next)
{
Console.WriteLine("Resource filter executing");
var resourceExecutedContext = await next();
Console.WriteLine("Resource filter executed");
if (!resourceExecutedContext.ModelState.IsValid)
{
throw new CustomUPException();
}
}
}
Code of middleware:
public class ResponseFormatterMiddleware : IMiddleware
{
private readonly ILogger<ResponseFormatterMiddleware> _logger;
public ResponseFormatterMiddleware(ILogger<ResponseFormatterMiddleware> logger)
{
_logger = logger;
}
public async Task InvokeAsync(HttpContext context, RequestDelegate next)
{
try
{
Console.WriteLine("Before execution");
await next(context);
Console.WriteLine("After Execution");
}
catch(CustomUPException e)
{
Console.WriteLine("Here we are");
await context.Response.WriteAsJsonAsync(
new ResponseDto()
{
statusCode = e.statusCode,
message = e.message
}); // getting error
}
catch(Exception e)
{
_logger.LogError(e.Message);
context.Response.StatusCode = (int) HttpStatusCode.InternalServerError;
await context.Response.WriteAsJsonAsync(
new ResponseDto()
{
success = false,
message = "Request failed"
});
}
}
}
Code of my controller:
[Route("api/[controller]")]
[ApiController]
public class TestingController : ControllerBase
{
[HttpPost("/resource")]
public async Task<UserDto> testingResource( [FromBody] UserDto dto)
{
if (dto.email.Contains("hell"))
{
throw new CustomUPException(); //working
}
return dto;
}
}
Instead of using resource filter, I have used this strategy for formatting model validation errors as the documentation suggests.
Curious to know more about the raised issue though. Thanks in advance
// Add services to the container.
builder.Services.AddControllers().ConfigureApiBehaviorOptions(
options =>
{
options.InvalidModelStateResponseFactory = context =>
{
if (!context.ModelState.IsValid)
{
var data = new Dictionary<string, string?>();
//My Response formatter
var modelStateDictionary = context.ModelState;
foreach (var key in modelStateDictionary.Keys)
{
var errors = modelStateDictionary[key]?.Errors;
data.TryAdd(key, errors?[0].ErrorMessage);
}
return new ObjectResult(new UniversalResponseDto()
{
data = data,
statusCode = (int)HttpStatusCode.UnprocessableEntity,
sucess = false,
message = "One or more validation error occured"
})
{
StatusCode = (int)HttpStatusCode.UnprocessableEntity,
};
}
return new ObjectResult(context.HttpContext.Response);
};
});
I have a service bus triggered Azure Function which listens for messages containing just blob URL strings of JSON data which each one of them is at least 10MB.
Message queue is near real-time(If I use the correct term) so producers keep putting messaging to the queue with a frequency so there is always data in the queue to be processed.
I have designed a solution but it gets OutOfMemoryException most of the time. The steps involved in the current solution sequentially are:
Consume a message
Download the file from the URL within the consumed message to a temporary folder
Read the whole file as a string
Deserialize it to an object
Partition into the chunks to supply Mongo bulk upsert limit
Bulk upsert to Mongo
I have tried to solve OutOfMemoryException and I thought that it's because my function/consumer don't have the same pace with the producer, so I think that at the time t1 when it gets the first message and process it and then while it's upserting to the mongo the function keeps getting the messages and they accumulate in the memory and waiting to be upserted.
Is my reasoning right?
Thus I think that If I could implement a streaming solution starting from #3, reading from file by chunking and putting it to a stream then I would prevent the memory keep growing and reduce time also. I have mostly Java background and I somehow know that with custom iterator/spliterator/iterable it is possible to do streaming and asynchronous processing.
How can I do asynchronous data streaming with .Net Core in an Azure Function?
Are there other approaches to solve this problem?
namespace x.y.Z
{
public class MyFunction
{
//...
[FunctionName("my-func")]
public async Task Run([ServiceBusTrigger("my-topic", "my-subscription", Connection = "AzureServiceBus")] string message, ILogger log, ExecutionContext context)
{
var data = new PredictionMessage();
try
{
data = myPredictionService.genericDeserialize(message);
await myPredictionService.ValidateAsync(data);
await myPredictionService.AddAsync(data);
}
catch (Exception ex)
{
//...
}
}
}
}
public class PredictionMessage
{
public string BlobURL { get; set; }
}
namespace x.y.z.Prediction
{
public abstract class BasePredictionService<T> : IBasePredictionService<T> where T : PredictionMessage, new()
{
protected readonly ILogger log;
private static JsonSerializer serializer;
public BasePredictionService(ILogger<BasePredictionService<T>> log)
{
this.log = log;
serializer = new JsonSerializer();
}
public async Task ValidateAsync(T message)
{
//...
}
public T genericDeserialize(string message)
{
return JsonConvert.DeserializeObject<T>(message);
}
public virtual Task AddAsync(T message)
{
throw new System.NotImplementedException();
}
public async Task<string> SerializePredictionResult(T message)
{
var result = string.Empty;
using (WebClient client = new WebClient())
{
var tempPath = Path.Combine(Path.GetTempPath(), DateTime.Now.Ticks + ".json");
Uri srcPath = new Uri(message.BlobURL);
await client.DownloadFileTaskAsync(srcPath, tempPath);
using (FileStream fs = File.Open(tempPath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
using (BufferedStream bs = new BufferedStream(fs))
using (StreamReader sr = new StreamReader(bs))
{
result = sr.ReadToEnd();
}
}
Task.Run(() =>
{
File.Delete(tempPath);
});
return result;
}
}
protected TType StreamDataDeserialize<TType>(string streamResult)
{
var body = default(TType);
using (MemoryStream stream = new MemoryStream(Encoding.Default.GetBytes(streamResult)))
{
using (StreamReader streamReader = new StreamReader(stream))
{
body = (TType)serializer.Deserialize(streamReader, typeof(TType));
}
}
return body;
}
protected List<List<TType>> Split<TType>(List<TType> list, int chunkSize = 1000)
{
List<List<TType>> retVal = new List<List<TType>>();
while (list.Count > 0)
{
int count = list.Count > chunkSize ? chunkSize : list.Count;
retVal.Add(list.GetRange(0, count));
list.RemoveRange(0, count);
}
return retVal;
}
}
}
namespace x.y.z.Prediction
{
public class MyPredictionService : BasePredictionService<PredictionMessage>, IMyPredictionService
{
private readonly IMongoDBRepository<MyPrediction> repository;
public MyPredictionService(IMongoDBRepoFactory mongoDBRepoFactory, ILogger<MyPredictionService> log) : base(log)
{
repository = mongoDBRepoFactory.GetRepo<MyPrediction>();
}
public override async Task AddAsync(PredictionMessage message)
{
string streamResult = await base.SerializePredictionResult(message);
var body = base.StreamDataDeserialize<List<MyPrediction>>(streamResult);
if (body != null && body.Count > 0)
{
var chunkList = base.Split(body);
await BulkUpsertProcess(chunkList);
}
}
private async Task BulkUpsertProcess(List<List<MyPrediction>> chunkList)
{
foreach (var perChunk in chunkList)
{
var filterContainers = new List<IDictionary<string, object>>();
var updateContainer = new List<IDictionary<string, object>>();
foreach (var item in perChunk)
{
var filter = new Dictionary<string, object>();
var update = new Dictionary<string, object>();
filter.Add(/*...*/);
filterContainers.Add(filter);
update.Add(/*...*/);
updateContainer.Add(update);
}
await Task.Run(async () =>
{
await repository.BulkUpsertAsync(filterContainers, updateContainer);
});
}
}
}
}
After making an api call, if i input a wrong detail. My app keeps breaking with a null exception
I tried using the if-else to solve it. but it is still the same error
public class RemoteService
{
HttpClient httpClient;
public RemoteService()
{
httpClient = new HttpClient();
httpClient.BaseAddress = new Uri($"{App.BackendUrl}/");
}
public async Task<WeatherResponse> GetWeatherData(string query)
{
var weatherResponse = new WeatherResponse();
var response = await httpClient.GetAsync($"weather?q=" + query + App.AppID);
if (response.IsSuccessStatusCode)
{
var content = await response.Content.ReadAsStringAsync();
weatherResponse = JsonConvert.DeserializeObject<WeatherResponse>(content);
weatherResponse.Error = false;
return weatherResponse;
}
else
{
//await Application.Current.MainPage.DisplayAlert("Error", "City not found", "OK");
return new WeatherResponse { Error = true };
}
}
}
The problem was actually from the viewmodel class. Solved
I am trying to implement Stripe.net into my Xamarin.Forms PCL using an ASP.NET Core MVC Web API. The goal is to process credit card payment from users. My web API runs locally on http://localhost:port for testing purposes.
In the PaymentPage, a user enters their credit card information into Entry objects and when they click the submit Button, a method in the PaymentPageViewModel is called to start the logic:
async void OnFinishBookingClicked(object sender, System.EventArgs e)
{
// TODO: Stripe integration
var viewModel = (PaymentPageViewModel)this.BindingContext;
await viewModel.ProcessPayment();
}
This is part of the PaymentPageViewModel:
private readonly IStripeRepository _repository;
private readonly IAPIRepository _api;
public PaymentPageViewModel(IStripeRepository repository, IAPIRepository api)
{
_repository = repository;
_api = api;
}
public async Task ProcessPayment()
{
try
{
if (string.IsNullOrEmpty(ExpirationDate))
ExpirationDate = "09/18";
var exp = ExpirationDate.Split('/');
var token = _repository.CreateToken(CreditCardNumber, exp[0], exp[1], SecurityCode);
await Application.Current.MainPage.DisplayAlert("Test Message", token, "OK");
await _api.ChargeCard(token, 5.00M);
}
catch (Exception ex)
{
await Application.Current.MainPage.DisplayAlert("Error", ex.Message, "OK");
}
}
This is what the APIRepository looks like:
public class APIRepository: IAPIRepository
{
const string Url = "http://localhost:5000";
private string authorizationKey;
private async Task<HttpClient> GetClient()
{
HttpClient client = new HttpClient();
if (string.IsNullOrEmpty(authorizationKey))
{
authorizationKey = await client.GetStringAsync(Url);
authorizationKey = JsonConvert.DeserializeObject<string>(authorizationKey);
}
client.DefaultRequestHeaders.Add("Authorization", authorizationKey);
client.DefaultRequestHeaders.Add("Accept", "application/json");
return client;
}
public async Task<string> ChargeCard(string token, decimal amount)
{
HttpClient client = await GetClient();
var json = JsonConvert.SerializeObject(new { token, amount });
var response = await client.PostAsync("/api/Stripe", new StringContent(json));
return await response.Content.ReadAsStringAsync();
}
}
The issue is that I get a series of errors during await _api.ChargeCard(token, 5.00M):
The first exception happens during authorizationKey = await client.GetStringAsync(Url); the exception message is the following:
{System.Net.Http.HttpRequestException: 404 (Not Found) at System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode () [0x0000a] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.2.0.11/src/mono/mcs/class/System.Net.Http/System.Net.Http/HttpResponseM…}
I get another exception during response = await client.PostAsync("/api/Stripe", new StringContent(json));
{System.InvalidOperationException: The request URI must either be an absolute URI or BaseAddress must be set at System.Net.Http.HttpClient.SendAsync (System.Net.Http.HttpRequestMessage request, System.Net.Http.HttpCompletionOption completionOption, System.Thr…}
The third exception happens at the catch block of the viewModel.ProcessPayment() method:
{System.NullReferenceException: Object reference not set to an instance of an object at Zwaby.Services.APIRepository+d__3.MoveNext () [0x00184] in /Users/carlos/Projects/Zwaby/Zwaby/Services/APIRepository.cs:57 --- End of stack trace from previou…}
In my Web API project, I have a StripeController, but my implementation may not be fully correct:
[Route("api/Stripe")]
public class StripeController : Controller
{
private readonly StripeContext _context;
public StripeController(StripeContext context)
{
_context = context;
if (_context.StripeCharges.Count() == 0)
{
_context.StripeCharges.Add(new StripeItem { });
_context.SaveChanges();
}
}
[HttpGet]
public IActionResult Get(string key)
{
// TODO: implement method that returns authorization key
}
[HttpPost]
public IActionResult Charge(string stripeToken, decimal amount)
{
var customers = new StripeCustomerService();
var charges = new StripeChargeService();
var customer = customers.Create(new StripeCustomerCreateOptions
{
SourceToken = stripeToken
});
var charge = charges.Create(new StripeChargeCreateOptions
{
Amount = (int)amount,
Description = "Sample Charge",
Currency = "usd",
CustomerId = customer.Id
});
return View();
}
}
For completeness, I am including the StripeRepository class, the other parameter of the PaymentPageViewModel:
public class StripeRepository: IStripeRepository
{
public string CreateToken(string cardNumber, string cardExpMonth, string cardExpYear, string cardCVC)
{
StripeConfiguration.SetApiKey("my_test_key");
//TODO: Wireup card information below
var tokenOptions = new StripeTokenCreateOptions()
{
Card = new StripeCreditCardOptions()
{
Number = "4242424242424242",
ExpirationYear = 2018,
ExpirationMonth = 10,
Cvc = "123"
}
};
var tokenService = new StripeTokenService();
StripeToken stripeToken = tokenService.Create(tokenOptions);
return stripeToken.Id;
}
}
Thank you so much!