jcborras/taht

taht is that misspelled on purpose

taht

"taht" is "that" misspelled on purpose.

Outside the python standard library it uses the Requests module for HTTP client functionality and Flask for HTTP server functionality.

Howto

• Clone the git repo

• On a separate window start up server.py

• On your main window run client.py

• Kill them both when you are done

The making of

• server.py is a rogue HTTP server. It only accepts request to '/' it returns random error codes even though every now and then it will produce actual content and a 200 status code. Beware though because even then the response content also varies randomly. Essentially it is used to model an unreliable HTTP-abiding resource.

• client.py is the actual multiprocess monitoring client. It's nothing fancy: creates a process for each resource to monitor and runs harnessed HTTP GET verbs with the information contained in each Resource class. How to deal with the returned content is define in the configuration file.

• config.py is the configuration file and is valid executable python code. There it defines a Resource type and a list of resources to monitor. Notice than some resources are monitored more than once in order to increase the number of processes and the chances of race conditions to happen.

• The Resource type requires a name, a url, a function generating polling intervals and a content checking function.

• monitor.py essentially defines an execution harness for HTTP requests. Sometimes i has come to my mind something like this in cloud environments and somehow I thought today was a good day to implement something like this. The number of test cases kind of reflect the creation process. It uses a python decorator instead of implementing a decorator pattern, YMMV.

• There is a Logger class which is nothing else than a print function protected with a lock in order to avoid race conditions. More complex logging can be constructed but the sync primitives will be needed anyway. Notice that it becomes a single resource under potentially heavy demand hence it may produce contention.