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].
Introducing DNS Shotgun
DNS Shotgun is a bechmarking tool specifically developed for realistic performance testing of DNS resolvers. Its goal is to simulate real clients and their behaviour, including timing of queries and realistic connection management, which are areas where traditional tools are lacking.
Improving DNS Server Telemetry
Since the end of January 2021, the data from all authoritative DNS servers operated by CZ.NIC about DNS transactions (queries and responses) is being collected exclusively using the new standard Compacted-DNS (C-DNS) format defined in RFC 8618. For data acquisition on the servers we use the DNS Probe software, developed by CZ.NIC Labs in cooperation with Brno Technical University. This milestone marks the end of a six-month transition period in which we migrated all servers from the traditional PCAP format that we used previously. During that period we heavily tested and improved the performance and stability of DNS Probe, and also compared the results obtained in both the old and new format.