Vlastimil Zíma | The CZ.NIC Staff Blog

Python CLI libraries analysis

An analysis of several Python CLI libraries to detect their usability in various cases.

Usecase

We want to design a command with following usage based on compilation of several existing commands:

Usage: testcli [options] [--choices=VALUE]... [--params=...] create <label>
       testcli [options] [--choices=VALUE]... [--params=...] drop <label>
       testcli -h | --help
       testcli --version

Options:
  -h, --help             Show this help message and exit.
  --version              Show program's version number and exit.
  --config=FILE          Set config file.
  --string=STRING        Set custom string.
  --number=NUMBER        Set custom number.
  --params=KEY=VALUE     Set custom parameters.
  --today=DATE           Set custom today [default: today].
  --choices=VALUE        Set custom choices [default: all]. Available options: 'all', 'foo', 'bar', 'baz'.
  -n, --dry-run          Don't actually do anything.
  -v,--verbosity=LEVEL   Set verbosity level in range 0 to 3 [default: 1].

Vlastimil Zíma

22.2.2021 at 10:10

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Changes in the FRED system architecture

Since its first release, FRED has come a long way and has changed significantly. From a relatively small original project, over time it has grown to include modules related to the registry and the time has come for it to get a more significant reconstruction. There have also been shifts in the way the interface is designed, in the project management, as well as technological changes. The original method with a distinctive interface for each client gave way to more general and smaller interfaces, which each client can combine according to their needs. Similarly, we are moving towards modular source code architecture and last but not least, we are replacing Corba technology with gRPC. Another significant disadvantage for the large system is the narrow and poorly defined interdependence of individual parts, which slows down its response to new queries.

Vlastimil Zíma

30.12.2020 at 9:50

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