blog.lidalia.org.uk

Software Development Thoughts

Sunday, 18 February 2018. Error handling when enforcing invariants in the construction of statically checked types. Tl;dr - error handling would be a lot less painful if the compiler could coerce an Either. At compile time if the program would not type check if it was an Either. Would type check if it was an A. And whether it was in fact a Left. Was decidable at compile time. Class with a constructor that accepts a String. Cannot be guaranteed to be a valid URI. The constructor throws URISyntaxException.

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Sunday, 18 February 2018. Error handling when enforcing invariants in the construction of statically checked types. Tl;dr - error handling would be a lot less painful if the compiler could coerce an Either. At compile time if the program would not type check if it was an Either. Would type check if it was an A. And whether it was in fact a Left. Was decidable at compile time. Class with a constructor that accepts a String. Cannot be guaranteed to be a valid URI. The constructor throws URISyntaxException.

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6 urisyntaxexception uri

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Software Development Thoughts | blog.lidalia.org.uk Reviews

https://blog.lidalia.org.uk

Sunday, 18 February 2018. Error handling when enforcing invariants in the construction of statically checked types. Tl;dr - error handling would be a lot less painful if the compiler could coerce an Either. At compile time if the program would not type check if it was an Either. Would type check if it was an A. And whether it was in fact a Left. Was decidable at compile time. Class with a constructor that accepts a String. Cannot be guaranteed to be a valid URI. The constructor throws URISyntaxException.

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blog.lidalia.org.uk

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Software Development Thoughts: November 2011

http://blog.lidalia.org.uk/2011_11_01_archive.html

Monday, 7 November 2011. Apache HTTPD - settings for use as a pure proxy. When using Apache HTTPD as a pure proxy to an application server, it may be useful to set AllowEncodedSlashes to "On" and set nocanon on the ProxyPass. This has the effect that the URIs are passed to the application server "as is" without Apache doing any security check on them or otherwise attempting to correct them. Naturally this puts the onus on the origin server to be secure. Posted by Robert Elliot. Links to this post. I am a...

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Software Development Thoughts: December 2013

http://blog.lidalia.org.uk/2013_12_01_archive.html

Tuesday, 31 December 2013. Running a service on a restricted port using IP Tables. Common problem - you need to run up a service (e.g. an HTTP server) on a port. Stupid. You don't want to run some quite complicated other thing you might misconfigure and whose features you don't actually need (I'm looking at you, Apache HTTPD) as a proxy just to achieve this end. What to do? Iptables -t nat -A PREROUTING -p tcp - dport 80 -j REDIRECT - to-ports 8080. Posted by Robert Elliot. Links to this post. Define myt...

3

Software Development Thoughts: April 2011

http://blog.lidalia.org.uk/2011_04_01_archive.html

Thursday, 21 April 2011. Setting the Default Java File Encoding to UTF-8 on a Mac. Recently had a lot of pain with tests containing non-ASCII characters; both Fitnesse and the GMaven* plugin for Maven were failing to read UTF-8 files correctly because they were picking up the MacRoman character set that is the default for Java on the Mac. You can start java up with an argument -Dfile.encoding=UTF-8, but that's a pain at best and very difficult if using tools that start JVMs up themselves.

4

Software Development Thoughts: Fixing Duplicate Resource Definitions for Defaulted Parameterised Defines in Puppet

http://blog.lidalia.org.uk/2013/12/fixing-duplicate-resource-definitions.html

Monday, 30 December 2013. Fixing Duplicate Resource Definitions for Defaulted Parameterised Defines in Puppet. Recently I have been working on a puppet module which defines a new resource which in turn requires a certain directory to exist, as so:. Define mything ($log dir='/var/log/mythings') { notify { "${name} installed! File { $log dir: ensure = directory } file { "${log dir}/${name}": ensure = directory, require = File[$log dir] } }. Mything { "thing1": } mything { "thing2": }. We get this error:.

5

Software Development Thoughts: Running a service on a restricted port using IP Tables

http://blog.lidalia.org.uk/2013/12/running-service-on-restricted-port.html

Tuesday, 31 December 2013. Running a service on a restricted port using IP Tables. Common problem - you need to run up a service (e.g. an HTTP server) on a port. Stupid. You don't want to run some quite complicated other thing you might misconfigure and whose features you don't actually need (I'm looking at you, Apache HTTPD) as a proxy just to achieve this end. What to do? Iptables -t nat -A PREROUTING -p tcp - dport 80 -j REDIRECT - to-ports 8080. Posted by Robert Elliot. 19 February 2014 at 16:34.

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Software Development Thoughts

Sunday, 18 February 2018. Error handling when enforcing invariants in the construction of statically checked types. Tl;dr - error handling would be a lot less painful if the compiler could coerce an Either. At compile time if the program would not type check if it was an Either. Would type check if it was an A. And whether it was in fact a Left. Was decidable at compile time. Class with a constructor that accepts a String. Cannot be guaranteed to be a valid URI. The constructor throws URISyntaxException.

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