As defined by Polly “A circuit breaker detects the level of faults in calls placed through it, and prevents calls when a configurable fault threshold is exceeded”.
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Fault tolerance using Polly
What is a Resilience Framework?
Polly is classed as a resilience framework. A resilience framework is a set of libraries that help an application to recover from transient or more extended failures in services or infrastructure upon which it depends. When recovery is not possible, the resilience framework will facilitate graceful degradation of your application.
Polly has been around for many years and has been tried and tested in many applications
http://www.thepollyproject.org/
The source code for Polly can be found on GitHub here:
https://github.com/App-vNext/Polly
Continue reading Fault tolerance using Polly
Throttling/Rate Limiter for an API
Throttling and rate-limiting allow you to prevent abuse of your API and ensure that your API withstands large numbers of calls (including DoS and accidental loops). With Throttling, you can set a delay on calls after an SLA tier has been exceeded, slowing down the number of requests an API client is making.
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ASP.NET Core Guidance
I came across a very good article on ASP.NET Core which I needed to bookmark, as it gives a clear and understandable guidance on keeping things working as efficiently as possible.
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Asynchronous Programming the right way
There is a right way and a wrong way with programme Asynchronously, mainly due to the initial way Microsoft brought in Async programming was not best practise and they have now made changes to make it more effective and be more productive.
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JSON Web Tokens (JWT)
Overview
JSON Web Tokens is an emerging standard. They are very close to their standardisation. IETF has taken care of that, and OpenID connect mandates the use of JSON Web token for all of the tokens that are exchanged in that protocol. this article gives you a little look, an overview of the purpose of security tokens, and, and what other types of tokens we have out there and where, where they are used. Then we have a look at the structure of a JSON Web Token, and then we’ll show you how easy it is to create and consume them using the Microsoft DotNet Core development framework.
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REST Client / Server API
Here is a simple REST Client talking to a stand along Server API all written in DotNet Core 3.1.
It is loosely based on creating a simple REST Client, an tutorial from Microsoft can give you the very basic features in DotNet Core
https://docs.microsoft.com/en-us/dotnet/csharp/tutorials/console-webapiclient
BitBucket Server to Jenkins
Nice video to attached a BitBucket Server to Jenkins
Health Checks
Using DotNet Core comes some responsibilities, one of those is making sure your application is up and running.
Since DotNet Core 2.2 the introductions of health checks have been established.
There are two types of Health Checks
- Liveness Health Checks
- Readiness Health Checks
Enabling docker remote API on OSX
Recently I was playing with docker API on OSX to use with Jenkins and the setup was little complicated so I thought to put all steps together in one place. Just to summarise the default tcp port for docker is 2375 (unencrypted) and 2376(encrypted) communication over tcp(although we can choose any other port).
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