Unix Shell Scripting
While building a simple HTTP Server in Racket, I wanted to automatically restart the server when I changed the source file.
To achieve this, I wrote a simple shell script.
Continue reading →Racket HTTP Server 2 - Reading the Path
Previously, I wrote a simple HTTP server in Racket. The next step I will take with this project is to figure out how to extract the HTTP method and path from the request.
The handle method's first argument, in, is an input port, from which the request can be read. We can read the first line from the request using the read-line function:
Adding TLS/SSL to a web service with Nginx
As I previously mentioned, it is almost always better to use a battle-hardened old favourite for security software, rather than to roll your own.
With Nginx, you can add SSL/TLS support in front of your web server, using tried and tested software.
Continue reading →Using Template Haskell to bundle data into an executable at compile time
Often, a program will rely on static data - lookup tables, files to serve, initial values for internal data structures, and so on. Template Haskell can be used to load files, and execute code, at compile time.
This is a very gentle introduction to the otherwise often intimidating world of Template Haskell. For the sake of simplicity, I am keeping a narrow focus: loading a file, and then manipulating the data from that file, both at compile time.
Continue reading →Racket HTTP Server
When I start playing with a new language, I like to have a look at how I could build a simple HTTP server in that language.
Racket's racket/tcp library provides us with functions for managing TCP connections. Using this, we can implement a server.
Mycs - Logistics Optimisation - Declarative Constraint Programming
Using Constraint Programming / MiniZinc for Manufacturing Optimisation
Used Declarative Constraint Programming (with MiniZinc) to optimise the assignment of Purchase Orders to Manufacturers, increasing Supply Chain cost-efficiency while also introducing checks and safeguards. Built a RESTful API wrapper in Go to allow the constraint solver to be accessed over the network.
Continue reading →Implementing a Feistel Cipher in Haskell
I was reading about Feistel Ciphers, and thought it would be fun to implement a toy one. I have shared it below.
Wikipedia Feistel Cipher ArticleGithub Gist: Haskell Feistel Cipher
Continue reading →Mycs - New Refunds Processing System
Development of a New Refunds Processing System
Built a new Refunds Tracking and Processing System for Mycs GmbH, a major European Retailer of Custom Furniture.
Continue reading →Erlang-Style Actor Model in Haskell
An Erlang-Style Actor Model implemented in Haskell
Continue reading →Remove unwanted pre-installed android apps without root
Note: Unfortunately, this does not remove absolutely all traces of the software (/malware!). But, it does remove them completely from view, and reduces the amount of disk space they consume. I am not aware of any better solution without rooting the device. If you are aware of a better solution, please get in touch!
Continue reading →