How to call ServiceStack AutoQuery from AspNetCore HostedService

You're changing the expected typed Response Type of the AutoQuery Service from QueryResponse<Customer> to ObjectsResponse<Customer> which is going to cause issues in typed client which are expecting the AutoQuery Response DTO. So you're going to have issues trying to call this with ServiceStack C#/.NET Clients or Service Gateway. If you want to change the response Type I would instead call a different API which uses the response from this API (e.g. with the Service Gateway) otherwise change QueryMerchantCustomers so that it's not an AutoQuery Service as it's currently lying about its Response Type. As it stands with an incompatible Response Type you'll only be able to call the Service Directly using:

var req = HttpContext.ToRequest(); // Convert ASP.NET HttpContext to IRequest
using var merchantServices = HostContext.ResolveService<MerchantServices>(req);
var response = merchantServices.Any(new QueryMerchantCustomers { ... });

Your services should also never be doing sync over async:

var merchant = _jointMerchantHandler.GetMerchantByGuidAsync(qry.MerchantGuid).GetAwaiter().GetResult();

Instead change your ServiceStack API to use an async method:

public async Task<object> AnyAsync(QueryMerchantCustomers qry)
{
}

To call this ServiceStack AutoQuery method from an ASP.NET Core HostedService, you can use the HttpClient class to send an HTTP request to the ServiceStack service and retrieve the response. Here's an example of how you can do this:

using System.Net.Http;
using System.Text;
using Newtonsoft.Json;
using YourNamespace; // Replace with your actual namespace

public class HostedService : IHostedService
{
    private readonly HttpClient _httpClient;

    public HostedService(IOptions<MyConfig> config, IHttpClientFactory httpClientFactory)
    {
        _config = config.Value;
        _httpClient = httpClientFactory.CreateClient();
    }

    public async Task StartAsync(CancellationToken cancellationToken)
    {
        while (!cancellationToken.IsCancellationRequested)
        {
            // Make a HTTP request to the ServiceStack service
            var requestUrl = $"http://{_config.ServiceAddress}/api/customers";
            var queryParams = new Dictionary<string, string> { { "merchantGuid", merchantGuid } };
            var response = await _httpClient.GetAsync(requestUrl, cancellationToken);
            
            // Handle the response and retrieve the customers
            var customersResponse = JsonConvert.DeserializeObject<ObjectsResponse<Customer>>(await response.Content.ReadAsStringAsync());
            if (customersResponse.Data == null) continue;
            
            // Do something with the customers, such as saving them to a database or sending an email notification
        }
    }
    
    public async Task StopAsync(CancellationToken cancellationToken)
    {
        await Task.CompletedTask;
    }
}

In this example, we first create an instance of the HttpClient class using the IHttpClientFactory service, which is available in ASP.NET Core 3.1 and later versions. We then define a hosted service that uses this client to make a GET request to the ServiceStack service. We add query parameters to the request URL with the merchantGuid parameter set to the value of a variable named merchantGuid.

We deserialize the response from the server using the JsonConvert.DeserializeObject<ObjectsResponse<Customer>>() method, which converts the JSON-formatted string returned by the service into an instance of the ObjectsResponse<Customer> class. We then check if the response contains any customers, and if so, we retrieve the list of customers from the Data property of the response object.

Finally, we do something with the customers (such as saving them to a database or sending an email notification), but you can replace this part with your own logic. Note that we also have a cancellationToken parameter in the StartAsync method, which is used to cancel the operation if necessary.

To call Any function from ASP.NET Core HostedService, you would have to create an interface (say IMyServiceStack) that mirrors the methods in the Service class. Then, register this service stack implementation in your startup class and inject it into your hosted service. Here's how to do it:

Firstly define the service contract like following :

[Route("/merchants/customers")]
public class QueryMerchantCustomers : IReturn<ObjectsResponse<Customer>>
{
    [ApiMember(Name="MerchantGuid", Description = "The guid of a merchant.", IsRequired = true)]
    public string MerchantGuid { get; set; }
} 

Then define your service interface:

public interface IMyServiceStack : IService
{
    ObjectsResponse<Customer> Any(QueryMerchantCustomers request);
}

Implement the ServiceStack AutoQuery logic inside a normal class that inherits Service like following:

public class MyAutoQueryService : Service,IMyServiceStack 
{
    public ObjectsResponse<Customer> Any(QueryMerchantCustomers qry) { ... }
} 

Then you have to register this in the startup.ConfigureServices method:

services.AddSingleton<IAppHost>(new AppHost()
                .InitializePluginNamed("service-stack")
                .ConfigureContainer(x => x.RegisterAs<MyAutoQueryService, IMyServiceStack>()));  

Finally you can use HostedService to call Any method like following:

public class MyBackgroundService : BackgroundService
{
    private readonly ILogger<MyBackgroundService> _logger;
    private readonly IMyServiceStack _service;  // inject it from the DI

    public MyBackgroundService(IMyServiceStack service, ILogger<MyBackgroundService> logger)
    {
        _service = service;
        _logger = logger;
    }

   protected override async Task ExecuteAsync(CancellationToken stoppingToken)
   { 
      while (!stoppingToken.IsCancellationRequested)
       {
          var response=_service.Any(new QueryMerchantCustomers(){ MerchantGuid = "..."}); //call the function
           _logger.LogInformation("Worker running at: {time}", DateTimeOffset.Now);
           await Task.Delay(1000, stoppingToken);   //delay
       } 
    }    
}

In this example, you can call Any method from the hosted service periodically with delay by using C#'s BackgroundService and Dependency Injection feature to get your registered service from DI. This is one of many ways that tasks could be scheduled in a .net core app.

Make sure your ServiceStack ApplicationHost has been setup correctly, you might need to add AppSettings configuration for setting up Service Stack application like below:

new AppHost().AppSettings = new TextFileConfiguration("~/appsettings.json");

To call the Any method from your AspNetCore HostedService, you can use the following steps:

1. Add a reference to the ServiceStack.dll assembly to your project.
2. Create a new ServiceStack client using the JsonServiceClient class.
3. Use the client to call the Any method, passing in the appropriate parameters.
4. Handle the response from the Any method and use the results as needed.

Here is an example of how to do this:

using ServiceStack;
using ServiceStack.Text;
using System.Threading;
using System.Threading.Tasks;

public class MyHostedService : IHostedService
{
    private readonly JsonServiceClient _client;

    public MyHostedService()
    {
        _client = new JsonServiceClient("http://localhost:5000");
    }

    public async Task StartAsync(CancellationToken cancellationToken)
    {
        // Create a new QueryMerchantCustomers object
        var qry = new QueryMerchantCustomers
        {
            MerchantGuid = "YOUR_MERCHANT_GUID",
            Page = 1,
            Limit = 10
        };

        // Call the Any method using the ServiceStack client
        var response = await _client.GetAsync(qry);

        // Handle the response from the Any method
        if (response.CountAll > 0)
        {
            // Do something with the results
        }
    }

    public Task StopAsync(CancellationToken cancellationToken)
    {
        // Clean up any resources
        return Task.CompletedTask;
    }
}

This code will create a new ServiceStack client and use it to call the Any method. The response from the Any method will be handled and the results will be used as needed.

To call the Any method of a ServiceStack AutoQuery service from an ASP.NET Core HostedService, you can use the JsonServiceClient class to send a JSON-RPC request to the AutoQuery service. Here's an example of how you can modify your HostedService to call the Any method:

First, you need to inject the IHttpClientFactory in your HostedService:

public class MyHostedService : IHostedService
{
    private readonly IHttpClientFactory _clientFactory;
    private readonly IMyRepository _repository; // your repository implementation

    public MyHostedService(IHttpClientFactory clientFactory, IMyRepository repository)
    {
        _clientFactory = clientFactory;
        _repository = repository;
    }
}

Then, create a JsonServiceClient instance using IHttpClientFactory:

private JsonServiceClient CreateJsonServiceClient()
{
    var httpClient = _clientFactory.CreateClient();
    return new JsonServiceClient(httpClient);
}

Now you can create a method that sends a JSON-RPC request to the AutoQuery service:

private ObjectsResponse<Customer> CallAutoQueryService(QueryMerchantCustomers qry)
{
    var client = CreateJsonServiceClient();
    qry.Page = qry.Page > 0 ? qry.Page : 1; // adjust page number since AutoQuery uses 1-based pagination
    qry.Skip = (qry.Page - 1) * qry.Limit;

    var request = new JsonRpcRequest
    {
        Id = 1,
        JsonRpc = "2.0",
        Method = "AutoQueryService.Any",
        Parameters = new object[] { qry }
    };

    var response = client.Post(request);
    return response.Result as ObjectsResponse<Customer>;
}

Note: Replace AutoQueryService with the actual name of your AutoQuery service.

Now you can call CallAutoQueryService from your HostedService:

protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
    while (!stoppingToken.IsCancellationRequested)
    {
        var query = new QueryMerchantCustomers();
        // set your query criteria here

        var result = CallAutoQueryService(query);
        // process the result here

        await Task.Delay(TimeSpan.FromMinutes(5), stoppingToken);
    }
}

Please note that you need to include the ServiceStack.Client NuGet package to use JsonServiceClient.

Also, since you're using JWT for authentication, you might need to include the JWT token in the request headers. You can do this by adding the following line before calling client.Post(request):

client.AddBearerToken("YOUR_JWT_TOKEN");

Replace "YOUR_JWT_TOKEN" with the actual token you want to use for authentication.

To call the AutoQuery method from the AspNetCoreHostedService, you can use the following code:

public void Any(QueryMerchantCustomers qry)
{
    // Your existing code...

    // Execute the query using AutoQuery
    var result = AutoQuery.Execute(qry, q);

    // Return the results
    return result;
}

Note:

• You need to replace _authHandler with your actual authentication handler.
• Make sure the _userDetailRepo is a repository for UserDetail objects that contains the LicenseId property.
• The MergeDetail() method should be defined for the Customer and UserDetail objects to perform data merging based on the LicenseId property.

To call the ServiceStack Any method from an ASP.NET Core HostedService, you cannot directly use the provided code snippet since they belong to different frameworks (ServiceStack and ASP.NET Core). However, we can suggest an alternative approach for you:

1. Create a separate ServiceStack service that implements the Any method with all of its logic. This will make it accessible via a JSON endpoint or any other ServiceStack-supported communication method. You'll need to expose this new ServiceStack service as a RESTful API using IServiceProvider and appsettings.json configuration file.

2. Inside your ASP.NET Core HostedService, create a method that sends a request to the newly created ServiceStack service asynchronously. You can make use of HttpClient to send HTTP requests and deserialize the response into appropriate data structures using JSON.net or any other preferred library.

Here's an example:

Create a new class called CustomerAutoQueryService that extends Service<ObjectsResponse<Customer>>.

using ServiceStack;
using ServiceStack.DataAccess;
using YourNamespace.Entities; // Update with your Customer entity namespace
using System.Collections.Generic;
using System.Threading.Tasks;

public class CustomerAutoQueryService : Service<ObjectsResponse<Customer>>
{
    private readonly ICustomerRepository _userDetailRepo; // Add this property to access the customer repository

    public CustomerAutoQueryService(ICustomerRepository userDetailRepo)
    {
        _userDetailRepo = userDetailRepo;
    }

    [Authenticate]
    public override async Task<ObjectsResponse<Customer>> Any(QueryMerchantCustomers qry)
    {
        // Implement your logic here to call the underlying `Any` method with a reference to this new class. Make sure to update any references to `this` in the provided code snippet accordingly.
    }
}

Update your global.asax.cs or Startup.cs file to register this new service as follows:

public void ConfigureServices(IServiceCollection services)
{
    services.AddControllers();
    services.AddService<CustomerAutoQueryService>(); // Register the new ServiceStack service
}

public class Startup
{
    public IServiceProvider ServiceProvider { get; private set; } = default!; // Assuming that this property is injected into Configure method by constructor injection or any other means.

    public void Configure(IApplicationBuilder app, IWebJobsStartupBuilder builder)
    {
        app.UseRouting();

        ServiceStackBootstrapper.Initialize(new AppHost()); // Initialize the new ServiceStack host
        
        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers(); // Map ASP.NET Core controllers and routes
            endpoints.MapService("/customer", typeof(CustomerAutoQueryService)); // Map the new ServiceStack service
        });

        if (app.Environment.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
    }
}

3. Inside your ASP.NET Core HostedService, send a request to the newly created ServiceStack service:

using System.Threading.Tasks;
using YourNamespace; // Update with the appropriate namespace
using HttpClient = System.Net.Http.HttpClient; // Importing the `HttpClient` class from System.Net.Http package instead of ServiceStack's version to make it clearer

public class YourHostedService : IHostedService, IDisposable
{
    private readonly ICustomerRepository _userDetailRepo;
    private readonly HttpClient _httpClient; // Create a new `HttpClient` instance for sending requests to your ServiceStack service

    public YourHostedService(ICustomerRepository userDetailRepo, IServiceProvider serviceProvider) // Update with the constructor that accepts `IServiceProvider`.
    {
        _userDetailRepo = userDetailRepo;
        _httpClient = new HttpClient(); // Initialize your HttpClient instance.
    }

    public async Task StartAsync(CancellationToken cancellationToken)
    {
        var response = await _httpClient.PostAsJsonAsync<QueryMerchantCustomers>("/customer/any", new QueryMerchantCustomers());

        if (response.IsSuccessStatusCode)
        {
            // Handle the successful response here and process the data as needed.
        }
    }
}

Please note that this example assumes you are familiar with the ASP.NET Core HostedService concept. Make sure you handle exceptions appropriately in your StartAsync method for error handling.

To call this function from an ASP.NET Core hosted service, you can use dependency injection to inject the necessary services, such as AutoQuery and _userDetailRepo. You can also use attributes or configuration files to configure the necessary parameters for this function.

Here's how you can call the above function from AspNetCore HostedService:

First, make sure that you have implemented a custom AuthHandler for AspNet Core using the IAM library. This is optional but recommended for better security and access control.

Next, create an instance of your AutoQuery service using the following code:

public async Task<Object> GetAutoQueryService() {
    var queryService = new Service('YourHostName', 'YourAuthKey') as 
        AsyncServerlessApplication.WithClientConfiguration(new AspNetCoreHsClientConfiguration(...));
    return new AspnetcoreQuery(queryService, "your_query", ...)
}

Replace "YourHostName" and "YourAuthKey" with the appropriate values for your service.

Finally, create a task that invokes your AutoQuery service using the following code:

public async Task<List<Customer>> QueryCustomers()
{
    return new AspnetcoreAutoQuerryTask(GetAutoQueryService());
}

Replace "your_query" with the name of the query that you want to execute. You can also pass additional parameters if required.

You're changing the expected typed Response Type of the AutoQuery Service from QueryResponse<Customer> to ObjectsResponse<Customer> which is going to cause issues in typed client which are expecting the AutoQuery Response DTO. So you're going to have issues trying to call this with ServiceStack C#/.NET Clients or Service Gateway. If you want to change the response Type I would instead call a different API which uses the response from this API (e.g. with the Service Gateway) otherwise change QueryMerchantCustomers so that it's not an AutoQuery Service as it's currently lying about its Response Type. As it stands with an incompatible Response Type you'll only be able to call the Service Directly using:

var req = HttpContext.ToRequest(); // Convert ASP.NET HttpContext to IRequest
using var merchantServices = HostContext.ResolveService<MerchantServices>(req);
var response = merchantServices.Any(new QueryMerchantCustomers { ... });

Your services should also never be doing sync over async:

var merchant = _jointMerchantHandler.GetMerchantByGuidAsync(qry.MerchantGuid).GetAwaiter().GetResult();

Instead change your ServiceStack API to use an async method:

public async Task<object> AnyAsync(QueryMerchantCustomers qry)
{
}

Calling ServiceStack AutoQuery from AspNetcore HostedService

Step 1: Install the ServiceStack.AutoQuery.Aspnetcore NuGet package

Install-Package ServiceStack.AutoQuery.Aspnetcore

Step 2: Create an instance of AutoQueryFactory

private readonly AutoQueryFactory _autoQueryFactory;

public YourController(AutoQueryFactory autoQueryFactory)
{
    _autoQueryFactory = autoQueryFactory;
}

Step 3: Build the AutoQuery query

public ObjectsResponse<Customer> Any(QueryMerchantCustomers qry)
{
    var query = _autoQueryFactory.CreateQuery<Customer>(qry);
    query.And<UserDetail>(x => x.LicenseId == merchant.LicenseId && !x.IsDelete);
    var results = query.Execute();
    // ...
}

Step 4: Access the results

var customers = results.Results.Select(x => x.ToCustomer().MergeDetail(details.FirstOrDefault(x => x.UserId == user.Id)));

Example:

public async Task<IActionResult> Index()
{
    var qry = new QueryMerchantCustomers
    {
        MerchantGuid = "abc123",
        Page = 0,
        Limit = 10
    };

    var customerService = new CustomerService();
    var customers = await customerService.Any(qry);

    return Json(customers);
}

Additional Notes:

• The AutoQueryFactory instance is used to create an instance of AutoQuery for the specified type Customer.
• The And method is used to specify additional filters on the query.
• The Execute method is used to execute the query and return the results.
• The ToCustomer method is used to convert the query results into Customer objects.
• The MergeDetail method is used to merge the customer details with the customer object.

See also:

• ServiceStack AutoQuery Documentation
• ServiceStack AutoQuery AspNetcore Integration