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Simple Resource Address Parser.

Project description

Python module to parse simple network resource addresses, like the ones used in many database systems to represent a database URI.

Used by Mongotail to parse the address passed through the command line, but can be used by any other Python application that needs to parse a MongoDB database address, or any other network resource like [SCHEMA://][[HOST OR IP][:PORT]/]RESOURCE.

Usage:

>>> from res_address import get_res_address
>>> scheme, host, port, resource, query, username, password = get_res_address("localhost:27017/test?timeout=5")
>>> print(scheme, host, port, resource, query, username, password)
None localhost 27017 test timeout=5 None None
>>> print(get_res_address("my_db"))
(None, None, None, 'my_db', None, None, None)
>>> scheme, ipv6, port, resource, query, username, password = get_res_address("https://[::1]:9999/foo")
>>> print(scheme, ipv6, port, resource)
https [::1] 9999 foo

The address can be:

foo

foo resource on local machine (IPv4 connection)

192.169.0.5/foo

foo resource on 192.168.0.5 machine

remotehost/foo

foo resource on remotehost machine

192.169.0.5:9999/foo

foo resource on 192.168.0.5 machine on port 9999

http://192.169.0.5:9999/foo

foo resource on 192.168.0.5 machine on port 9999, scheme http

“[::1]:9999/foo”

foo resource on ::1 machine on port 9999 (IPv6 connection)

:1234/foo

foo resource on port 1234

user:pass@localhost/foo

foo resource on localhost, with basic authentication

localhost/foo?timeout=500

foo resource on localhost, with query string

The only required component in the URI is the resource. Some validations are performed over the host, port and resource strings, and an exception is launched if some of the checks fail, but take into account that invalid range of IP addresses or incompatible resource names may pass:

>>> address = get_res_address("localhost:INVALIDport/test")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "res_address/__init__.py", line 74, in get_res_address
    raise InvalidPortError('Invalid port number "%s"' % port, address, port)
res_address.InvalidPortError: Invalid port number "INVALIDport"

All the validation exceptions inherit from AddressError:

  • InvalidHostError

  • InvalidPortError

  • InvalidResourceError

  • NotResourceProvidedError

Difference with urllib.parse

If you need a library that can fully parse web URLs you should use urllib.parse instead. This library intends to be used with simpler URIs for database resources, with only one resource name set, e.g. “my_db” or “localhost:123/my_db”, but not “localhost:123/my_db/my_table”. Also a URL like “localhost:123” that is a valid HTTP URL, is not as database URL because the “resource” (the database name) is not set.

Also to get the keys and values of the query component returned by get_res_address(), a function like urllib.parse.parse_qs() is recommended:

>>> from res_address import get_res_address
>>> from urllib.parse import parse_qs
>>> scheme, host, port, resource, query, username, password = get_res_address("localhost/db?timeout=500")
>>> parse_qs(query).get('timeout', None)
['500']

Run the tests

Just execute (Python 2.7 or 3.5+):

$ python setup.py test

Or:

$ python -m unittest -v tests

About

Project: https://github.com/mrsarm/python-res-address

Authors: (2018-2022) Mariano Ruiz <mr…@gmail.cm>

License: LGPL-3

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