What's New in Pyramid 1.8
|
=========================
|
|
This article explains the new features in :app:`Pyramid` version 1.8 as
|
compared to its predecessor, :app:`Pyramid` 1.7. It also documents backwards
|
incompatibilities between the two versions and deprecations added to
|
:app:`Pyramid` 1.8, as well as software dependency changes and notable
|
documentation additions.
|
|
Major Feature Additions
|
-----------------------
|
|
- Added :meth:`pyramid.config.Configurator.add_exception_view` and the
|
:func:`pyramid.view.exception_view_config` decorator. It is now possible
|
using these methods or via the new ``exception_only=True`` option to
|
:meth:`pyramid.config.Configurator.add_view` to add a view which will only
|
be matched when handling an exception. Previously, any exception views were
|
also registered for a traversal context that inherited from the exception
|
class which prevented any exception-only optimizations.
|
See https://github.com/Pylons/pyramid/pull/2660
|
|
- ``pserve --reload`` now uses the
|
`hupper <http://docs.pylonsproject.org/projects/hupper/en/latest/>`_
|
library to monitor file changes. This comes with many improvements:
|
|
- If the `watchdog <http://pythonhosted.org/watchdog/>`_ package is
|
installed then monitoring will be done using inotify instead of
|
cpu and disk-intensive polling.
|
|
- The monitor is now a separate process that will not crash and starts up
|
before any of your code.
|
|
- The monitor will not restart the process after a crash until a file is
|
saved.
|
|
- The monitor works on windows.
|
|
- You can now trigger a reload manually from a pyramid view or any other
|
code via ``hupper.get_reloader().trigger_reload()``. Kind of neat.
|
|
- You can trigger a reload by issuing a ``SIGHUP`` to the monitor process.
|
|
See https://github.com/Pylons/pyramid/pull/2805
|
|
Minor Feature Additions
|
-----------------------
|
|
- Python 3.6 compatibility.
|
https://github.com/Pylons/pyramid/issues/2835
|
|
- The ``_get_credentials`` private method of
|
:class:`pyramid.authentication.BasicAuthAuthenticationPolicy`
|
has been extracted into standalone function
|
:func:`pyramid.authentication.extract_http_basic_credentials`, this function
|
extracts HTTP Basic credentials from a ``request`` object, and returns them
|
as a named tuple. See https://github.com/Pylons/pyramid/pull/2662
|
|
- Pyramid 1.4 silently dropped a feature of the configurator that has been
|
restored. It's again possible for action discriminators to conflict across
|
different action orders.
|
See https://github.com/Pylons/pyramid/pull/2757
|
|
- :func:`pyramid.paster.bootstrap` and its sibling
|
:func:`pyramid.scripting.prepare` can now be used as context managers to
|
automatically invoke the ``closer`` and pop threadlocals off of the stack
|
to prevent memory leaks. See https://github.com/Pylons/pyramid/pull/2760
|
|
- Added the ``exception_only`` boolean to
|
:class:`pyramid.interfaces.IViewDeriverInfo` which can be used by view
|
derivers to determine if they are wrapping a view which only handles
|
exceptions. This means that it is no longer necessary to perform request-time
|
checks for ``request.exception`` to determine if the view is handling an
|
exception - the pipeline can be optimized at config-time.
|
See https://github.com/Pylons/pyramid/pull/2660
|
|
- ``pcreate`` learned about ``--package-name`` to allow you to create a new
|
project in an existing folder with a different package name than the project
|
name. See https://github.com/Pylons/pyramid/pull/2783
|
|
- ``pserve`` should now work with ``gevent`` and other workers that need
|
to monkeypatch the process, assuming the server and / or the app do so
|
as soon as possible before importing the rest of pyramid.
|
See https://github.com/Pylons/pyramid/pull/2797
|
|
- Pyramid no longer copies the settings object passed to the
|
``pyramid.config.Configurator(settings=)``. The original ``dict`` is kept.
|
See https://github.com/Pylons/pyramid/pull/2823
|
|
- The csrf trusted origins setting may now be a whitespace-separated list of
|
domains. Previously only a python list was allowed. Also, it can now be set
|
using the ``PYRAMID_CSRF_TRUSTED_ORIGINS`` environment variable similar to
|
other settings. See https://github.com/Pylons/pyramid/pull/2823
|
|
- A new ``[pserve]`` section is supported in your config files with a
|
``watch_files`` key that can configure ``pserve --reload`` to monitor custom
|
file paths. See https://github.com/Pylons/pyramid/pull/2827
|
|
- Allow streaming responses to be made from subclasses of
|
:class:`pyramid.httpexceptions.HTTPException`. Previously the response would
|
be unrolled while testing for a body, making it impossible to stream
|
a response.
|
See https://github.com/Pylons/pyramid/pull/2863
|
|
- Update starter, alchemy and zodb scaffolds to support IPv6 by using the
|
new ``listen`` directives in waitress.
|
See https://github.com/Pylons/pyramid/pull/2853
|
|
- All p* scripts now use argparse instead of optparse. This improves their
|
``--help`` output as well as enabling nicer documentation of their options.
|
See https://github.com/Pylons/pyramid/pull/2864
|
|
- Added an ``override`` option to
|
:meth:`pyramid.config.Configurator.add_translation_dirs` to allow
|
later calls to place translation directories at a higher priority then
|
earlier calls. See https://github.com/Pylons/pyramid/pull/2902
|
|
- Added a new ``callback`` option to
|
:meth:`pyramid.config.Configurator.set_default_csrf_options`` which
|
can be used to determine per-request whether CSRF checking should be enabled
|
to allow for a mix authentication methods. Only cookie-based methods
|
generally require CSRF checking.
|
See https://github.com/Pylons/pyramid/pull/2778
|
|
Backwards Incompatibilities
|
---------------------------
|
|
- Following the Pyramid deprecation period (1.6 -> 1.8),
|
daemon support for pserve has been removed. This includes removing the
|
daemon commands (start, stop, restart, status) as well as the following
|
arguments: ``--daemon``, ``--pid-file``, ``--log-file``,
|
``--monitor-restart``, ``--status``, ``--user``, ``--group``,
|
``--stop-daemon``
|
|
To run your server as a daemon you should use a process manager instead of
|
pserve.
|
|
See https://github.com/Pylons/pyramid/pull/2615
|
|
- Change static view to avoid setting the ``Content-Encoding`` response header
|
to an encoding guessed using Python's ``mimetypes`` module. This was causing
|
clients to decode the content of gzipped files when downloading them. The
|
client would end up with a ``foo.txt.gz`` file on disk that was already
|
decoded, thus should really be ``foo.txt``. Also, the ``Content-Encoding``
|
should only have been used if the client itself broadcast support for the
|
encoding via ``Accept-Encoding`` request headers.
|
See https://github.com/Pylons/pyramid/pull/2810
|
|
- ``pcreate`` is now interactive by default. You will be prompted if a file
|
already exists with different content. Previously if there were similar
|
files it would silently skip them unless you specified ``--interactive``
|
or ``--overwrite``.
|
See https://github.com/Pylons/pyramid/pull/2775
|
|
- Support for the ``IContextURL`` interface that was deprecated in Pyramid 1.3
|
has been removed. See https://github.com/Pylons/pyramid/pull/2822
|
|
- Settings are no longer accessible as attributes on the settings object
|
(e.g. ``request.registry.settings.foo``). This was deprecated in Pyramid 1.2.
|
See https://github.com/Pylons/pyramid/pull/2823
|
|
- Removed undocumented argument ``cachebust_match`` from
|
``pyramid.static.static_view``. This argument was shipped accidentally
|
in Pyramid 1.6. See https://github.com/Pylons/pyramid/pull/2681
|
|
Deprecations
|
------------
|
|
- The ``pcreate`` script and the core scaffolds (``starter``, ``alchemy`` and
|
``zodb``) have been deprecated.
|
|
They have been replaced with the decision to embrace the popular
|
`cookiecutter <https://cookiecutter.readthedocs.io/en/latest/>`_ project
|
as a best-of-breed project templating solution.
|
|
``pcreate`` was originally introduced when very few alternatives existed
|
that supported Python 3. Fortunately the situation has improved and
|
with possible tooling support for cookiecutters being discussed by major
|
IDEs, and the simplicity of the jinja2 syntax, it is exciting to embrace
|
the project moving forward!
|
|
All of Pyramid's official scaffolds as well as the tutorials have been
|
ported to cookiecutters:
|
|
- `pyramid-cookiecutter-starter
|
<https://github.com/Pylons/pyramid-cookiecutter-starter>`_
|
|
- `pyramid-cookiecutter-alchemy
|
<https://github.com/Pylons/pyramid-cookiecutter-alchemy>`_
|
|
- `pyramid-cookiecutter-zodb
|
<https://github.com/Pylons/pyramid-cookiecutter-zodb>`_
|
|
See https://github.com/Pylons/pyramid/pull/2780
|
|
Documentation Enhancements
|
--------------------------
|
|
- Update Typographical Conventions.
|
https://github.com/Pylons/pyramid/pull/2838
|
|
- Add `pyramid_nacl_session
|
<http://docs.pylonsproject.org/projects/pyramid-nacl-session/en/latest/>`_
|
to session factories. See https://github.com/Pylons/pyramid/issues/2791
|
|
- Update HACKING.txt from stale branch that was never merged to master.
|
See https://github.com/Pylons/pyramid/pull/2782
|
|
- Updated Windows installation instructions and related bits.
|
See https://github.com/Pylons/pyramid/issues/2661
|
|
- Fix an inconsistency in the documentation between view predicates and
|
route predicates and highlight the differences in their APIs.
|
See https://github.com/Pylons/pyramid/pull/2764
|
|
- Clarify a possible misuse of the ``headers`` kwarg to subclasses of
|
:class:`pyramid.httpexceptions.HTTPException` in which more appropriate
|
kwargs from the parent class :class:`pyramid.response.Response` should be
|
used instead. See https://github.com/Pylons/pyramid/pull/2750
|
|
- The SQLAlchemy + URL Dispatch + Jinja2 (``wiki2``) and
|
ZODB + Traversal + Chameleon (``wiki``) tutorials have been updated to
|
utilize the new cookiecutters and drop support for the ``pcreate``
|
scaffolds.
|
|
See https://github.com/Pylons/pyramid/pull/2881 and
|
https://github.com/Pylons/pyramid/pull/2883.
|
|
- Quick Tour, Quick Tutorial, and most files throughout the documentation have
|
been updated to use cookiecutters instead of pcreate and scaffolds.
|
See https://github.com/Pylons/pyramid/pull/2888 and
|
https://github.com/Pylons/pyramid/pull/2889
|
|
- Updated the ``mod_wsgi`` tutorial to use cookiecutters and Apache 2.4+.
|
See https://github.com/Pylons/pyramid/pull/2901
|