BEFactoryBusinessLayer 1.0.14

Backend Factory

A library Back End for c# developer

History version

[v1.0.13] 2024-06-16

Added

• property ResponseContentBody on httpsClientHelper

[v1.0.14] 2024-06-21

Code review

• Code review on httpsClientHelper

When it is necessary not to deserialize a response from an httpClient call, it is possible to invoke the sednAsync method passing the object class as the type. In this case the http call payload will be returned. Here is an example:

    protected httpsClientHelper _httpsClientHelper;
   _httpsClientHelper.sendAsync<object>(
       response.URLApiFeed,
       response.ContentType,
       response.httpMethod,
       (exception) => loggerExtension.Trace(response.UrlADM, request.CorrelationId, Serilog.Events.LogEventLevel.Error, null, "Eccezione: {exception}", exception),
       (nrretry) => loggerExtension.Trace(response.UrlADM, request.CorrelationId, Serilog.Events.LogEventLevel.Warning, null, "Numero di retry pari a : {nrretry}", nrretry)
       ).GetAwaiter().GetResult();
   
   string payload = _httpsClientHelper.ResponseContentBody;

Topics

• BEFactoryBusinessLayer.Auth
• BEFactoryBusinessLayer.BackgroundJobs
• BEFactoryBusinessLayer.caching
• BEFactoryBusinessLayer.http
• BEFactoryBusinessLayer.Linq
• BEFactoryBusinessLayer.Logger
• BEFactoryBusinessLayer.resilience
• BEFactoryBusinessLayer.RMQ
• BEFactoryBusinessLayer.TaskHelper
• BEFactoryBusinessLayer.Validation

Auth

Library for authorize to get a controller (documentation soon online)

BackgroundJobs

Library for manage Hangfire (documentation soon online)

caching

This project is used to manage RabbitMQ using more channels (documentation soon online)

httpsClientHelper

This library allows you to manage different scenarios for using named HttpClients via IHttpClientFactory injection

Configuration

• AppSettings.json:

  "HttpClientOptions": [
    {
      "name": "reqres",
      "certificate": {
        "path": "your_path_Certificate",
        "password": "your_password_"
      },
      "RateLimitOptions": {
        "AutoReplenishment": true,
        "PermitLimit": 150,
        "QueueLimit": 10,
        "Window": "00:01:00",
        "SegmentsPerWindow": 100
      }
    },
    {
      "name": "yourclientName2",
      "certificate": {
        "path": "your_path_Certificate",
        "password": "your_password_"
      },
      "RateLimitOptions": {
        "AutoReplenishment": true,
        "PermitLimit": 1,
        "QueueLimit": 1,
        "Window": "00:00:03",
        "SegmentsPerWindow": 100
      }
    }
  ]

• program.cs:

    builder.Services.AddHttpClients(builder.Configuration);

Once everything has been configured and the line on the program.cs class has been added we are ready to exploit the httpClient class to satisfy different scenarios

• example:

    [HttpGet("sample")]
    public async Task<IActionResult> sample(bool AcceptAnyCertificate, string RateLimiteName) {
        httpsClientHelper httpsClientHelper = new httpsClientHelper(
                _httpFactory
                ,Guid.NewGuid().ToString()
                ,   (action, HttpRequest, HttpResponse, dtStart, dtEnd, idTransaction, NrRetry, exception, HttpStatusResponse)
                    => loggerExtension.Trace("test http", DateTime.Now.ToString(), HttpResponse.StatusCode != System.Net.HttpStatusCode.OK ? Serilog.Events.LogEventLevel.Warning : Serilog.Events.LogEventLevel.Information, null, "Trace HTTP : action = {action}, Request = {HttpRequest}, Response = {HttpResponse}, dtStart = {dtStart}, dtEnd = {dtEnd}, IdTransaction = {idTransaction}, NrRetry = {NrRetry}, Exception {Exception}, status HTTP : {HttpStatusResponse}", action, HttpRequest.ToString(), HttpResponse.ToString(), dtStart, dtEnd, idTransaction, NrRetry, exception, HttpStatusResponse)
                , AcceptAnyCertificate
                );
        httpsClientHelper
            .LoadHttpHandler(_httpClientOption.Where(a => a.name == RateLimiteName).FirstOrDefault())
            .setHeadersAndBasicAuthentication(new Dictionary<string, string> { { "Alex", "Alex" } }, new httpsClientHelper.httpClientAuthenticationBasic("Alex", "Alex"))
            .setRetryOptions(new RetryFactoryOptions {
                ActionOnRetry = (result, timespan, retryCount) => { /* something to do for alert a retry */},
                delayForRetry = new TimeSpan[] { TimeSpan.FromSeconds(5), TimeSpan.FromSeconds(5) },
                ConditionForRetry = (http) => http.StatusCode == System.Net.HttpStatusCode.NotFound 
            });
        for (int i = 0; i < 30; i++) {
            HttpResponseMessage message = await httpsClientHelper.sendAsync<HttpResponseMessage>(
                $"https://reqres.in/api/users/{i}", 
                "application/json", 
                "get"
                );
            if (message!= null) {
                string response = await message.Content.ReadAsStringAsync();
            }
        }
        return Ok();
    }

In the httpsClientHelper constructor, we pass as parameters

• the interface IHttpClientFactory ( _httpFactory )

• A guide like IdTransaction

• An Action that accepts as parameters:

  • action: To log the context in which you are making the http call
  • HttpRequest The HttpRequestMessage
  • HttpResponse The HttpsponseMessage
  • dtStart Is time when request is invoked
  • dtEnd Corresponds to the time the response arrives
  • idTransaction It is a Guid (string) in case you want to check in the logs what happened for that transaction
  • NrRetry Matches the number of retries if the setRetryOptions method is also added
  • exception Matches the exception ( is a string ) in case the call fails Corresponds to the exception (it is a string) in case the call fails (intended as an unhandled exception, in case you want to track a response with httpStatus other than 200, you can use the httpResponse parameter)
  • HttpStatusResponse Corresponds to the HttpStatus of the response The parameters declared by appsettings in the HttpClientOptions:RateLimitOptions path are loaded (where name corresponds to the value passed into the controller)

• The next usefull method LoadHttpHandler (loads the DelegatingHandler interface passing the parameters configured to appsettings.json for the desired name) In particular, there are two parameters:

  • AcceptAnyCertificate ( if is true bypasses the error in case the certificate is expired or invalid (the certificate is loaded from the parameters declared on appSettings, i.e. HttpClientOptions:certificate:path and HttpClientOptions:certificate:password)
  • RateLimiteName ( In this case the SlidingWindowRateLimiter option is loaded as rate limit with the default QueueProcessingOrder value (in a future release the possibility of passing other types of rate limits will be added) )

• method setHeadersWithoutAuthorization ( if you want to pass headers to HTTP calls )
• method setHeadersAndBearerAuthentication ( if you want to pass headers to HTTP calls and Bearer Auhentication)
• method setHeadersAndBasicAuthentication ( if you want to pass headers to HTTP calls and Basic Authentication )

Logger

Use Serilog with several sinks and customizations (documentation soon online)

Resilience

Very useful Polly client features (documentation soon online)

RMQ

Use RabbitMQ to admin with more channel and isolate business logic to consume it

Configuration

• AppSettings.json:

  "rabbitMQChannelsOptions": [
    {
      "Name": "FirstName",
      "IdFeed": 1,
      "RabbitEndPoint": {
        "HostName": "Your_Endpoint",
        "UserName": "Your_UserName",
        "Password": "Your_Password",
        "ClientProvidedName": "Your_ClientName",
        "VirtualHost": "Your_Virtual",
        "QueueName": "Your_QueueName_",
        "RejectMessageWithError": true
      }
    },
    {
      "Name": "SecondName",
      "IdFeed": 2,
      "RabbitEndPoint": {
        "HostName": "Your_Endpoint",
        "UserName": "Your_UserName",
        "Password": "Your_Password",
        "ClientProvidedName": "Your_ClientName",
        "VirtualHost": "Your_Virtual",
        "QueueName": "Your_QueueName_",
        "RejectMessageWithError": true
      }
    }
  ]    

• Name : used to identify the name of the queue to manage

• IdFeed : Id of channel

• RabbitEndPoint:HostName : Url of RMQ producer

• RabbitEndPoint:UserName : Username of RMQ producer

• RabbitEndPoint:Password : Password of RMQ producer

• RabbitEndPoint:ClientProvidedName : ClientProvidedName of RMQ producer

• RabbitEndPoint:VirtualHost : VirtualHost of RMQ producer

• RabbitEndPoint:QueueName : QueueName of RMQ producer

• RabbitEndPoint:RejectMessageWithError : boolean value, when true the response is inserted into the unacknowledged message queue

• program.cs:

//To load Configuration
builder.Services.AddOptions();
var rabbitMQChannelsOptions = builder.Configuration.GetSection("rabbitMQChannelsOptions");
builder.Services.Configure<List<RabbitMQChannelsOptions>>(rabbitMQChannelsOptions);
List<RabbitMQChannelsOptions> channelSettings = builder.Configuration.GetSection("rabbitMQChannelsOptions").Get<List<RabbitMQChannelsOptions>>();
/*
   Inject RabbitMQ service:
   This add delegate to run youir businesseLogic, in this case i add 
   Func<DbContext, RabbitMQChannelsOptions, string, string, string, Response>
   Where : 
   - - DbContext is your custom DbContext to manage SQL Server
   - - RabbitMQChannelsOptions is option load before
   - - payload is content sent from RMQ
   - - CorrelationId is value sent from header RMQ
   - - MessageType where defined is a string property set on property RMQ to identify your action

   addhostedrabbitService inject a AddHostedService to manage queue
*/
builder.Services.addhostedrabbitService<ApplicationDbContext>(
   (dbcontext, channelOptions, payload, CorrelationId, MessageType) => new Feedfactory(channelSettings).ConsumeMessage((ApplicationDbContext)dbcontext, channelOptions, payload, CorrelationId, MessageType)
);

In this case all the business logic is performed by the ConsumeMessage method of the Feedfactory class which reads all the queues configured on appSettings.

Note that a custom one named ApplicationDbContext is passed as DbContext

Also in case you need to use HttpClient to consume an http request you can use the HttpsClientHelper library by taking the IHttpClientFactory class. This is done via the piece of code written below:

var _httpClientFactory = scope.ServiceProvider.GetRequiredService<IHttpClientFactory>();
 IactionParseRMQ iactionParseRMQ = scope.ServiceProvider.GetRequiredService<IactionParseRMQ>();
 iactionParseRMQ._httpClientFactory = _httpClientFactory;
 responseCheck = iactionParseRMQ.RunCommandOnConsuming(iactionParseRMQ._httpClientFactory, iactionParseRMQ._dbContextClient, feed, payload, CorrelationId, MessageType);

TaskHelper (documentation soon online)

Some example to use Task async

Validation (documentation soon online)

To use a response with some Pattern Design

-

• • Program.cs: Config host and inject services.

#region RabbitMQ
builder.Services.AddOptions();
var rabbitMQChannelsOptions = builder.Configuration.GetSection("rabbitMQChannelsOptions");
builder.Services.Configure<List<RabbitMQChannelsOptions>>(rabbitMQChannelsOptions);
List<RabbitMQChannelsOptions> channelSettings = builder.Configuration.GetSection("rabbitMQChannelsOptions").Get<List<RabbitMQChannelsOptions>>();

builder.Services.AddDbContext<ApplicationDbContext>(options => {
    options.UseSqlServer(builder.Configuration.GetConnectionString("default"),
        sqlServerOptionsAction: sqloptions => sqloptions.EnableRetryOnFailure());
}, ServiceLifetime.Scoped);

builder.Services.addhostedrabbitService<ApplicationDbContext>(
    (dbcontext, channelOptions, payload, CorrelationId, MessageType) => new Feedfactory(channelSettings).ConsumeMessage((feedDbContext)dbcontext, channelOptions, payload, CorrelationId, MessageType)
);
#endregion

For every message consumed by RMQ youcan use lambda like : 
	(dbcontext, channelOptions, payload, CorrelationId, MessageType) => new Feedfactory(channelSettings).ConsumeMessage((feedDbContext)dbcontext, channelOptions, payload, CorrelationId, MessageType)