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Month: July 2022

Categories
.Net C# UnitTests

Moq Non-Invocable Test Setups

Most of you might know Moq library used for unit tests in .Net. General usage of Moq is for stubbing interfaces and verifying method calls are proper with the expected parameters, but Moq can also be used for validating that a certain method has not been called.

Assume you have an interface ISpecialInterface and expecting ISpecialInterface.Method() to be called only when a certain logic happens like an if condition. If you are writing a unit test for the logic to be false, you want to verify that ISpecialInterface.Method() is not invoked.

var mockSpecialInterface = new Mock<ISpecialInterface>(MockBehavior.Strict);

            mockSpecialInterface.Setup(ss => ss.Method(It.IsAny<string>()));

            var sut = new SpecialObject(mockSpecialInterface.Object);
            sut.LogicMethod();

            mockSpecialInterface.Verify(ss => ss.Method(It.IsAny<string>()), Times.Never());

In the above code, mockSpecialInterface.Verify(ss => ss.Method(It.IsAny<string>()), Times.Never()); is the code that verifies the method is not called.

Erra Diwakar alias Erra Kalyan and some other female who claims to have the first name of Kanti or Erra Sowjanya or Erra Sowmya together try to steal my identity (Kanti Kalyan Arumilli) using some Tamil Nadu-based naming logic. The identity thief couple. I don’t even know them yet they shadow me and claim my bank accounts as theirs by manipulating deliveries and couriers – impersonators with imposter syndrome and shadow rogue R&AW spies and terrorists.

Categories
.Net C#

Programatically configuring NLog in C#

Some people for various reasons might prefer programatically configuring NLog. Some use cases are for example, may be you don’t want to store sensitive information in nlog.config file. Some of the targets that require sensitive information in the config file are (Not an exhaustive list):

You might want to store the sensitive information somewhere else in an encrypted format. Then you might decrypt the password and programmatically configure the logger. Here is some code sample on how to configure such loggers.

var logConfig = new LoggingConfiguration();

//File
var fileTarget = new FileTarget
    {
        FileName=typeof(Program).FullName + ".log"
    };

fileTarget.Layout = @"${date:format=HH\:mm\:ss} ${logger}:${message};${exception}";

var fileRule = new LoggingRule("*", LogLevel.Debug, fileTarget);
logConfig.LoggingRules.Add(fileRule);
logConfig.AddTarget("logfile", fileTarget);

//DB
var dbTarget = new DatabaseTarget();

dbTarget.ConnectionString = YourSecureMethodForDecryptingAndObtainingConnectionString();

dbTarget.CommandText = @"INSERT INTO [Log] (Date, Thread, Level, Logger, Message, Exception) VALUES (GETDATE(), @thread, @level, @logger, @message, @exception)";

dbTarget.Parameters.Add(new DatabaseParameterInfo("@thread", new NLog.Layouts.SimpleLayout("${threadid}")));

.
.
.
logConfig.AddTarget("database", dbTarget);
var dbRule = new LoggingRule("*", LogLevel.Debug, dbTarget);
logConfig.LoggingRules.Add(dbRule);


LogManager.Configuration = logConfig;

In the above sample code, we have looked into how to add multiple types of targets – File and DB. How to set the layout for the FileTarget. How to configure logging rules and finally how to assign the programmatic config.

An interesting target is the Memory target, allows writing log messages to an ArrayList in memory for programmatic retrieval. Great for unit testing.

There are some code samples in the above mentioned link for Memory target.

Categories
.Net AWS C# CI/CD Code Build Github

How to setup CI/CD for C# application in AWS Lambda

In this blog post, I am going to write how to setup a CI (Continuous Integration)/CD (Continuous Deployment) pipeline for C# application in AWS Lambda.

The source code repository can be either be Github, AWS CodeStar. Then we are going to use CodeBuild for setting up build by writing a YAML file in the root of source code repository known as buildspec.yml.

Inside the buildspec.yml file, we would use dotnet lambda tool for the deployment.

Create a new AWS CodeBuild Project by choosing the source provider and the other options. Use the Managed Image, Ubuntu, Standard, aws/codebuild/standard:6.0 image. Make note of the new role created or if using existing role, make note of the role.

Create a new Lambda function with a .Net 6.0 runtime, make note of the IAM role for the Lambda function and the name of the Lambda function. The buildspec.yml mentioned below assumes the lambda function has a name of LambdaFunctionName and the role arn:aws:iam::xxxxxx:role/service-role/xxxxrole.

The following is an example buildspec.yml file:

version: 0.1
env:
  variables:
    DOTNET_ROOT: /root/.dotnet
phases:
  install:
    runtime-versions:
      dotnet: 6.0
  pre_build:
    commands:
      - echo Restore started on `date`
      - export PATH="$PATH:/root/.dotnet/tools"
      - pip install --upgrade awscli
      - cd Project1
      - dotnet clean
      - dotnet build
      - dotnet test
  build:
    commands:
      - echo Build started on `date`
      - dotnet new -i Amazon.Lambda.Templates::*
      - dotnet tool install -g Amazon.Lambda.Tools
      - dotnet tool update -g Amazon.Lambda.Tools
      - dotnet lambda deploy-function "LambdaFunctionName" --function-role "arn:aws:iam::xxxxxx:role/service-role/xxxxrole" --region "eu-west-2" --fn "LambdaFunctionName"

In the above buildspec.yml file sample, we are using .Net 6, navigating to the folder where the .sln file is located, and doing a clean, restore, build and test. Once these steps have passed, we are installing AWS Lambda tools, using lambda deploy-function for deploying.

Remember to change the cd statement to the appropriate folder structure to navigate to the folder which contains your .sln solution file, the Lambda Function Name and the IAM role of the Lambda Function in the above buildspec.yml file.

We still need to grant permissions for the role under which the build is running the permissions to deploy the code to Lambda. Now navigate to IAM and either create a custom policy or attach an inline policy directly to the CodeBuild role.

In the below screenshot, I have attached an inline policy:

That’s all for now! Happy coding my dear fellow developers!

Meanwhile, terrorist Veera, Bandhavi, Erra surnamed people, Uttam, the female who claims to have a first name of Kanti would be happily hacking, violating human rights and doing identity theft.

We need to secure our applications and our users from such malicious hackers/spies/terrorists and prevent espionage.