Metadata-Version: 2.4
Name: portend
Version: 3.1.0
Summary: TCP port monitoring and discovery
Home-page: https://github.com/jaraco/portend
Author: Jason R. Coombs
Author-email: jaraco@jaraco.com
Classifier: Development Status :: 5 - Production/Stable
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: MIT License
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3 :: Only
Requires-Python: >=3.7
License-File: LICENSE
Requires-Dist: tempora>=1.8
Provides-Extra: testing
Requires-Dist: pytest>=6; extra == "testing"
Requires-Dist: pytest-checkdocs>=2.4; extra == "testing"
Requires-Dist: pytest-flake8; extra == "testing"
Requires-Dist: pytest-black>=0.3.7; platform_python_implementation != "PyPy" and extra == "testing"
Requires-Dist: pytest-cov; extra == "testing"
Requires-Dist: pytest-mypy; platform_python_implementation != "PyPy" and extra == "testing"
Requires-Dist: pytest-enabler>=1.0.1; extra == "testing"
Provides-Extra: docs
Requires-Dist: sphinx; extra == "docs"
Requires-Dist: jaraco.packaging>=8.2; extra == "docs"
Requires-Dist: rst.linker>=1.9; extra == "docs"
Dynamic: license-file

.. image:: https://img.shields.io/pypi/v/portend.svg
   :target: `PyPI link`_

.. image:: https://img.shields.io/pypi/pyversions/portend.svg
   :target: `PyPI link`_

.. _PyPI link: https://pypi.org/project/portend

.. image:: https://github.com/jaraco/portend/workflows/tests/badge.svg
   :target: https://github.com/jaraco/portend/actions?query=workflow%3A%22tests%22
   :alt: tests

.. image:: https://img.shields.io/badge/code%20style-black-000000.svg
   :target: https://github.com/psf/black
   :alt: Code style: Black

.. image:: https://readthedocs.org/projects/portend/badge/?version=latest
   :target: https://portend.readthedocs.io/en/latest/?badge=latest

.. image:: https://img.shields.io/badge/skeleton-2021-informational
   :target: https://blog.jaraco.com/skeleton

por·tend
pôrˈtend/
verb

    be a sign or warning that (something, especially something momentous or calamitous) is likely to happen.

Usage
=====

Use portend to monitor TCP ports for bound or unbound states.

For example, to wait for a port to be occupied, timing out after 3 seconds::

    portend.occupied('www.google.com', 80, timeout=3)

Or to wait for a port to be free, timing out after 5 seconds::

    portend.free('::1', 80, timeout=5)

The portend may also be executed directly. If the function succeeds, it
returns nothing and exits with a status of 0. If it fails, it prints a
message and exits with a status of 1. For example::

    python -m portend localhost:31923 free
    (exits immediately)

    python -m portend -t 1 localhost:31923 occupied
    (one second passes)
    Port 31923 not bound on localhost.

Portend also exposes a ``find_available_local_port`` for identifying
a suitable port for binding locally::

    port = portend.find_available_local_port()
    print(port, "is available for binding")

Portend additionally exposes the lower-level port checking functionality
in the ``Checker`` class, which currently exposes only one public
method, ``assert_free``::

    portend.Checker().assert_free('localhost', 31923)

If assert_free is passed a host/port combination that is occupied by
a bound listener (i.e. a TCP connection is established to that host/port),
assert_free will raise a ``PortNotFree`` exception.