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AQMP is a library, and ideally it should not print error diagnostics unless a user opts into seeing them. By default, Python will print all WARNING, ERROR or CRITICAL messages to screen if no logging configuration has been created by a client application. In AQMP's case, ERROR logging statements are used to report additional detail about runtime failures that will also eventually be reported to the client library via an Exception, so these messages should not be rendered by default. (Why bother to have them at all, then? In async contexts, there may be multiple Exceptions and we are only able to report one of them back to the client application. It is not reasonably easy to predict ahead of time if one or more of these Exceptions will be squelched. Therefore, it's useful to log intermediate failures to help make sense of the ultimate, resulting failure.) Add a NullHandler that will suppress these messages until a client application opts into logging via logging.basicConfig or similar. Note that upon calling basicConfig(), this handler will *not* suppress these messages from being displayed by the client's configuration. Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-id: 20210923004938.3999963-8-jsnow@redhat.com Signed-off-by: John Snow <jsnow@redhat.com> |
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qemu | ||
tests | ||
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avocado.cfg | ||
Makefile | ||
MANIFEST.in | ||
PACKAGE.rst | ||
Pipfile | ||
Pipfile.lock | ||
README.rst | ||
setup.cfg | ||
setup.py | ||
VERSION |
QEMU Python Tooling =================== This directory houses Python tooling used by the QEMU project to build, configure, and test QEMU. It is organized by namespace (``qemu``), and then by package (e.g. ``qemu/machine``, ``qemu/qmp``, etc). ``setup.py`` is used by ``pip`` to install this tooling to the current environment. ``setup.cfg`` provides the packaging configuration used by ``setup.py``. You will generally invoke it by doing one of the following: 1. ``pip3 install .`` will install these packages to your current environment. If you are inside a virtual environment, they will install there. If you are not, it will attempt to install to the global environment, which is **not recommended**. 2. ``pip3 install --user .`` will install these packages to your user's local python packages. If you are inside of a virtual environment, this will fail; you want the first invocation above. If you append the ``--editable`` or ``-e`` argument to either invocation above, pip will install in "editable" mode. This installs the package as a forwarder ("qemu.egg-link") that points to the source tree. In so doing, the installed package always reflects the latest version in your source tree. Installing ".[devel]" instead of "." will additionally pull in required packages for testing this package. They are not runtime requirements, and are not needed to simply use these libraries. Running ``make develop`` will pull in all testing dependencies and install QEMU in editable mode to the current environment. (It is a shortcut for ``pip3 install -e .[devel]``.) See `Installing packages using pip and virtual environments <https://packaging.python.org/guides/installing-using-pip-and-virtual-environments/>`_ for more information. Using these packages without installing them -------------------------------------------- These packages may be used without installing them first, by using one of two tricks: 1. Set your PYTHONPATH environment variable to include this source directory, e.g. ``~/src/qemu/python``. See https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPATH 2. Inside a Python script, use ``sys.path`` to forcibly include a search path prior to importing the ``qemu`` namespace. See https://docs.python.org/3/library/sys.html#sys.path A strong downside to both approaches is that they generally interfere with static analysis tools being able to locate and analyze the code being imported. Package installation also normally provides executable console scripts, so that tools like ``qmp-shell`` are always available via $PATH. To invoke them without installation, you can invoke e.g.: ``> PYTHONPATH=~/src/qemu/python python3 -m qemu.qmp.qmp_shell`` The mappings between console script name and python module path can be found in ``setup.cfg``. Files in this directory ----------------------- - ``qemu/`` Python 'qemu' namespace package source directory. - ``tests/`` Python package tests directory. - ``avocado.cfg`` Configuration for the Avocado test-runner. Used by ``make check`` et al. - ``Makefile`` provides some common testing/installation invocations. Try ``make help`` to see available targets. - ``MANIFEST.in`` is read by python setuptools, it specifies additional files that should be included by a source distribution. - ``PACKAGE.rst`` is used as the README file that is visible on PyPI.org. - ``Pipfile`` is used by Pipenv to generate ``Pipfile.lock``. - ``Pipfile.lock`` is a set of pinned package dependencies that this package is tested under in our CI suite. It is used by ``make check-pipenv``. - ``README.rst`` you are here! - ``VERSION`` contains the PEP-440 compliant version used to describe this package; it is referenced by ``setup.cfg``. - ``setup.cfg`` houses setuptools package configuration. - ``setup.py`` is the setuptools installer used by pip; See above.