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Tag: ASP.Net MVC

Categories
.Net ASP.Net C# Grafana Telemetry

Using OpenTelemetry in ASP.Net MVC

OpenTelemetry is pretty much like logs and metrics with distinguishable TraceId’s.

Yesterday and this morning I have experimented with OpenTelemetry in a sample ASP.Net MVC application.

The Primary components are:

  1. A host for Tempo – using Grafana hosted Tempo – https://www.grafana.com. Grafana has a very generous 100GB traces per month in the free tier.
  2. Grafana Agent – As of now, I have used Grafana Agent on Windows laptop, have not configured on Linux production servers yet. Grafana Agent can be downloaded from here. Click on the releases in the right side and choose the Operating System. Here is the link for v0.31.0.
  3. OpenTelemetry SDK for .Net

The OpenTelemetry SDK for .Net are in preview, the API’s might change.

Install the Grafana Agent and update the configuration file. Here is a sample of the config:

server:
  log_level: warn
metrics:
  wal_directory: C:\ProgramData\grafana-agent-wal
  global:
    scrape_interval: 1m
  configs:
    - name: integrations
integrations:
  windows_exporter:
    enabled: true
traces:
  configs:
  - name: default
    remote_write:
      - endpoint: tempo-us-central1.grafana.net:443
        basic_auth:
          username: <YOUR GRAFANA USER_ID>
          password: "<YOUR GRAFANA API KEY>"
    receivers:
      jaeger:
        protocols:
          grpc:
          thrift_binary:
          thrift_compact:
          thrift_http:
      zipkin:
      otlp:
        protocols:
          http:
          grpc:
      opencensus:

Restart the Grafana Service Services.

Add the following pre-release dll’s to your ASP.Net MVC application.

“OnLINE Erra, Thota terrorist bastards are spy bastards, they don’t command me, I do whatever I like, because they use invisible spying drone they try to frame me“

OpenTelemetry.Api
OpenTelemetry.Exporter.Jaeger
OpenTelemetry.Extensions.Hosting
OpenTelemetry.Instrumentation.AspNetCore
OpenTelemetry.Instrumentation.Http

Now use the following code:

builder.Services.AddOpenTelemetry()
        .WithTracing(builder => builder  .SetResourceBuilder(ResourceBuilder.CreateDefault().AddService("Sample-Web"))
            .AddAspNetCoreInstrumentation()
            .AddGrpcCoreInstrumentation()
            .SetErrorStatusOnException()
            .AddJaegerExporter()
            .AddConsoleExporter())
        .StartWithHost();

Run the application.

Now goto your Grafana account, click browse select the traces from the drop down in the top.

Grafana

Clicking on one of the trace id shows the details:

Grafana Traces

There are additional Trace Collectors that can be used on a necessity basis for:

MySQL Client

SQL Server Client

HTTP Client

GRPC

ElasticSearch

AWS

AWS Lambda

You can expect to see some more blog articles regarding Loggin, Tracing and Metrics i.e Observability.

–

Mr. Kanti Kalyan Arumilli

Arumilli Kanti Kalyan, Founder & CEO
Arumilli Kanti Kalyan, Founder & CEO

B.Tech, M.B.A

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Founder & CEO, Lead Full-Stack .Net developer

ALight Technology And Services Limited

ALight Technologies USA Inc

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Phone / SMS / WhatsApp on the following 3 numbers:

+91-789-362-6688, +1-480-347-6849, +44-07718-273-964

+44-33-3303-1284 (Preferred number if calling from U.K, No WhatsApp)

kantikalyan@gmail.com, kantikalyan@outlook.com, admin@alightservices.com, kantikalyan.arumilli@alightservices.com, KArumilli2020@student.hult.edu, KantiKArumilli@outlook.com and 3 more rarely used email addresses – hardly once or twice a year.

Categories
.Net ASP.Net C#

Dependency Injection in ASP.Net MVC Core explained

Dependency Injection is a software development pattern where instead of directly instantiating objects, the objects required by a class are passed in. This helps with maintaining code flexibility, writing unit test cases etc…

The first and foremost thing is to define interfaces and then write implementations. This way, the consuming code needs to know about the methods to be invoked without worrying about the implementation. Software known as Dependency Injection container takes care of instantiating the actual objects as long as the bindings are defined.

This blog post is not about Dependency Injection or Unit Tests but more about how to use Dependency Injection in ASP.Net MVC Core. ASP.Net MVC Core comes with an in-built DI container and supports constructor-based injection i.e instances are passed into the constructor of the consuming class.

There are 3 scopes for objects:

Transient: Every time a class needs an object, a new instance of the requested object is instantiated and passed in. i.e for example if there are 3 classes that need an instance of IService, each class will receive it’s own copy every time even if the three classes are used as part of the same request/response.

Scoped: One object for a particular type is created per request/response and the same object is passed into every class that requests the object processing one request/response cycle.

Singleton: One instance of the class is instantiated for the entire lifetime of the application and the same instance is passed for every class in every request/response cycle.

The use cases for each would vary. Scoped is the default i.e one object for a given type for every class in the same request/response cycle.

Singleton’s are useful in cases such as IConfiguration where the same class can be passed around for getting config information rather than having multiple instances.

Interfaces and implementation classes can be registered by calling the following methods on IServiceCollection for example

AddSingleton<IInterface, Implementation>();
AddScoped<IInterface, Implementation>();
AddTransient<IInterface, Implementation>();

or in Singleton if the object is already instantiated, the object can be passed in by calling:

AddSingleton<IInterface>(instance);

–

Mr. Kanti Kalyan Arumilli

Arumilli Kanti Kalyan, Founder & CEO
Arumilli Kanti Kalyan, Founder & CEO

B.Tech, M.B.A

Facebook

LinkedIn

Threads

Instagram

Youtube

Founder & CEO, Lead Full-Stack .Net developer

ALight Technology And Services Limited

ALight Technologies USA Inc

Youtube

Facebook

LinkedIn

Phone / SMS / WhatsApp on the following 3 numbers:

+91-789-362-6688, +1-480-347-6849, +44-07718-273-964

+44-33-3303-1284 (Preferred number if calling from U.K, No WhatsApp)

kantikalyan@gmail.com, kantikalyan@outlook.com, admin@alightservices.com, kantikalyan.arumilli@alightservices.com, KArumilli2020@student.hult.edu, KantiKArumilli@outlook.com and 3 more rarely used email addresses – hardly once or twice a year.