Blog 42

Upgrading Postgres Docker containers

This is a follow up to my old post from 2018: Upgrade Postgres Container to Version 10 [https://peter.grman.at/upgrade-postgres-9-container-to-10/] In the meanwhile, I upgraded every year my Docker containers to the newest version of Postgres and realized, I can further optimize that process. But first, let's take

C#

Async Processing Pipeline with Rx.Net

I was looking for the easiest way to process task asynchronously, but keep the order. However, implementing something on top of the BlockingCollection [https://docs.microsoft.com/en-us/dotnet/api/system.collections.concurrent.blockingcollection-1?view=netcore-2.2] seemed a bit of an overkill. Simple async/await Instead, the original

Architecture

Testing your REST APIs end to end

I hope you agree, that testing your code is important. If you don't automate it, you'll need to do it manually, which is slow and tedious. That's why I prefer automated testing. I'm just too lazy to manually test every aspect of the applications I'm building, after each tiny change

.NET-Core

APM for .Net Core on Linux - Beyond Log Analyzing

> For the folks out there, not familiar with the abbreviation APM, in the context of this post stands for Application Performance Monitoring [https://en.wikipedia.org/wiki/Application_performance_management]. APM 0.1 - Leverage existing tools (and logs) For the last 2 years, I'm part of a team building

Postgres

Repeatable Read vs Serializable Isolation Level in Postgres

The question I want to answer here, is the question I had for the last 1.5 years: > When to use which isolation level and what is the difference in real world scenarios? What's wrong with read committed? First off, you might wonder, why am I comparing those 2 strict

WPF

Combine Multiple ViewModels in WPF

I just helped a colleague of mine with a tricky task: * The user chooses from a drop down on View 1 * Based on that choice, data and controls in View 3 need to be adjusted The task description is straight forward and basically resembles any slightly more complicated wizard. Unfortunately,

Docker

Hosting Static Files in Containers

Currently I'm hosting a bunch of static HTML files (with CSS, JS, images, ...) inside a plane nginx container. Mostly nginx:alpine [https://hub.docker.com/_/nginx/], but sometimes also openresty/openresty:alpine [https://hub.docker.com/r/openresty/openresty/] and other similar containers, to be precise. The odd thing is,

Docker

Upgrade Postgres Container to Version 10

> For a newer version to this post, have a look at Upgrading Postgres Docker containers [https://peter.grman.at/upgrading-postgres-docker-containers/] Postgres version 10 is here [https://wiki.postgresql.org/wiki/New_in_postgres_10] - well actually it's out for couple months already, but I finally got to use it.

Do You Have a README in Your Repository?

This post is not about RTFM[1]. It is also not about commenting every public and private function in your code, just to increase the amount of comments. Since I read Clean Code by Robert C. Martin [https://books.google.de/books/about/Clean_Code.html?id=hjEFCAAAQBAJ&redir_esc=

Angular

The State of Angular and TypeScript Development in 2018

For everyone who just wants to see the summary of how I'm doing Angular and TypeScript development today, TL;DR would be enough. If you want the whole story - why I chose those tools, skip it and move forward to the full post. TL;DR * You can use any

Tools

Jekyll vs postach.io vs ghost

As I wrote in my last post (and my first for a long time) [https://peter.grman.at/changes-2012-2018/], I realized that I didn't write for almost 2 years. Reflecting on how it happened, I of course found a lot of excuses, since a lot was going on in that

Tools

What changed since 2012? - Things are simpler now! (in 2018)

Yesterday, I realized, that it's been almost 2 long years since my last post. A lot has happened in that time and while migrating this blog to ghost, I reflected on some older posts of mine and noticed how things got easier. Since most of my posts are basically about

Tools

Vagrant on Windows with gulp-watch and similar file watching tools

As you might have guessed from my previous posts I love Vagrant and Gulp. I think those tools are awesome. They make my life much easier by either packing everything into a VM which I can destroy and recreate whenever things go south (Vagrant), or automating every little bit I

Tools

Vagrant + Docker = Rainbows + Unicorns

Be honest with yourself, how many applications and services do you have running on your machine right now? And how many do you really need? Step 0 - rant 2 weeks ago, when I started my new job, I remembered the times when I just had to fill up my

Other

3 Types of Programmers and Why Programming Should Be Easy

Few days ago I listened to Scott Hanselman's 500th podcast (congratulations on that), You don't know JS with Getify (Kyle Simpson) [http://hanselminutes.com/500/you-dont-know-js-with-getify-kyle-simpson]. Not everyone needs to know, how to drive a stick I had mixed feelings about that podcast and was thinking for a long time

TypeScript

Getting Started With TypeScript and AngularJS

> Almost a year ago, I wrote an introductory article about developing server and client applications in TypeScript - TypeScript Development in Practice [https://peter.grman.at/typescript-development-in-practice/]. A lot of things have changed since then so this is a longer and much more thorough description of what is possible today:

TypeScript

How to write your own TypeScript Definition Files

TypeScript is an amazing language. It makes working with JavaScript just so much easier, at least for me. To be honest, I never really understood or even liked JavaScript. It was a mystery for me, how you can use it to write large applications. But when TypeScript came out -

TypeScript

Explaining How `this` Changes in JavaScript and TypeScript

My girlfriend is learning Meteor [https://www.meteor.com/] as she already has some knowledge in AngularJS and I personally think TypeScript would make her life easier (eventually) I suggested her, to follow the great tutorial on AngularJS with Meteor [http://angular-meteor.com/tutorial], but implement it in TypeScript. Her

C#

Handling Excel-Files (*.xls, *.xlsx) in Web Applications ICSharpCode.SharpZipLib.Zip.ZipException: EOF in header

I'm working on a SaaS application in ASP.NET MVC, which takes your KPIs [http://en.wikipedia.org/wiki/Performance_indicator] and presents them to you in clear overviews and graphs, so you can see at a glance, how your business is doing and what needs to change. This is

ASP.NET-MVC

Request Authorization in ASP.NET Web API in Mono

Few days ago I was struggling to set up authorization on requests to my Web API. The major Problem was missing sessions. You can read more here: Request Authorization in ASP.NET Web API [https://peter.grman.at/request-authorization-in-asp-net-web-api/]. After I set it up, it was running and everything seemed

ASP.NET-MVC

Request Authorization in ASP.NET Web API

When you use ASP.NET Web API as a back-end for your JavaScript heavy Single Page Application (SPA), you might want to check who is performing requests, before you answer with a result. In my case, the different permissions are a bit bulky and I'm storing them in the user's

TypeScript

TypeScript Development in Practice

I'm using TypeScript [http://www.typescriptlang.org] already since 2012 for rich client development on top of AngularJS. As the server was written in ASP.Net, we were using Visual Studio for Server and Client. I didn't have almost any experience in JavaScript, or Angular. So TypeScript's strong typing and

Tools

Ignore node_modules in Dropbox

Actually this problem isn't only about NodeJS development and the node_modules folders, but this is where it's the most pain. It's more about having any kind of way to download and generate a ton of files within seconds and afterwards waiting for hours, or even days for Dropbox to

Java

SQLiteException: no such table - in Android

I was just struggling for a while trying to help with an Android app. I have almost no specific Android experience, but as the app is pretty basic, I thought - can't be that hard. The beginning seemed pretty easy and straight forward, until we stumbled upon this exception: android.

ASP.NET-MVC

What to Consider when running ASP.NET MVC 4 in Mono

I'm fighting for the last 2 days to deploy my ASP.NET MVC 4 application to a Linux VM running Mono again. - Again because it already worked, but in the meanwhile Microsoft updated the MVC 4 library and something broke (read more: Microsoft Asp.Net MVC Security Update MS14-059