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Description:

pyramidlog 1.0.1

What It Does
The pyramid_log distribution includes a Python logging formatter
which makes Pyramid request attributes available for use in its
format string. Specifically, pyramid_log.Formatter is special in
the following ways:

It sets a .request attribute on the log record (if one doesn’t
already exist.)
It supports dotted attribute access in its format string. For
example, "%(request.method)s" and even
"%(request.matched_route.name)s" will work in the format string.
There is a syntax for explicitly specifying fallback values. For
example, a format string of "%(request.method|<no request>)s"
will format to "<no request>" if there is no current request (or
if the current request has no method attribute.)

The pyramid request has many attributes which can be useful when included
in the logs of a web app. These include, but are not limited to:

request.method
request.url (or request.path, request.path_qs, etc…)
request.unauthenticated_userid
request.client_addr
request.GET (or request.POST or request.params)
request.matched_route.name, request.view_name

See the Pyramid documentation for a more
complete list of available request attributes.

Installation
The distribution may be downloaded from pypi, but it may be easier to
install using pip:
pip install pyramid-log
It has been tested on python 2.7, 3.4–3.6 and pypy.
Development happens at https://github.com/dairiki/pyramid_log/.

Configuration

Configuring Logging in a File
If you configure logging in your application configuration (or some
other) file you can do something like:
[loggers]
key = root

[handlers]
keys = console

[formatters]
keys = pyramid

[logger_root]
level = INFO
handlers = console

[handler_console]
class = StreamHandler
args = (sys.stderr,)
level = NOTSET
formatter = pyramid

[formatter_pyramid]
# NB: Here is the interesting part!
class = pyramid_log.Formatter
format = %(asctime)s %(request.method|no request)s %(request.path_qs|)s
%(levelname)-5.5s [%(name)s] %(message)s
This will result in your log messages looking something like:
2014-10-01 17:55:02,001 GET /path?arg=foo
WARNI [myapp.views] This is some log message!
Refer to Pyramid’s chapter on logging and the documentation for the
Python logging module’s configuration file format for more details
on how this works.

Imperative Configuration
You can of course configure logging imperatively. For example, with:
import logging
from pyramid_log import Formatter

fmt = Formatter(
'%(asctime)s %(request.client_addr|-)s'
' %(request.method|-)s %(request.path_qs|-)s: %(message)s')

logging.basicConfig()
root_logger = logging.getLogger()
for handler in root_logger.handlers:
handler.setFormatter(fmt)
Then, a view can log a message like so:
log = logging.getLogger(__name__)

@view_config(name='persimmon')
def persimmon_view(request):
log.warning("%s was called!", request.view_name)
Which will yield a log message like:
2014-10-01 17:55:02,001 192.168.1.1 GET /persimmon: persimmon was called

Further Details

Accessing Dict-like Values
The dot notation can be used to access not only instance attributes,
but also to access items in dict-like values. Attribute access is
tried first; if there is no attribute of the given name, then the
instances __getitem__ method is tried. For example,
"%(request.matchdict.id)s" will get at
request.matchdict['id'].

Numeric Fallback
Explicit fallback values are always interpreted as strings, however,
if the fallback is used in a numeric context, an attempt will be made
at conversion to the requested type. For example, if there is no
request, "%+(request.status_code|555)d" will format to "+555".
If the fallback string can not be converted to a numeric value, then
0 (zero) is used in integer contexts and NaN is used in float
contexts.

Default Fallback Values
If no fallback value is explicitly specified, then a default fallback
value will be used if the requested attribute does not exist. The
missing attribute name is included in the default fallback value. For
example "%(request.method)s" will produce "<?request.method?>"
if there is no current request.

See Also
The pyramid_logging distribution provides similar functionality.

Author
Jeff Dairiki <dairiki@dairiki.org>

History

Release 1.0.1 (2021-12-07)
A bit of code refactoring and cleanup in preparation for dropping
python 2 support.
No API or functional changes.

Release 1.0 (2021-12-05)
This release adds support for python>=3.8 and pyramid>=2.
The 1.x releases will be the last to support running under python 2.7.

Compatibility

Python >= 3.8: logger.Formatter requires the validate=False
argument, otherwise it forbids '.' in %-style format strings.
Pyramid >= 2.0: provide our own replacement for pyramid.compat
which no longer exists

Testing

Test under python 3.7–3.10 and pypy3.
Stop testing under python 3.4 and 3.5.
Test with Pyramid 1.*
Convert CI tests from Travis to github workflow

Packaging

The packaging has been PEP517-ized.

Release 0.2.1 (2017-12-17)
This release officially drops support for python 2.6, 3.2, 3.3 (and
therefore pypy3) and adds support for python 3.5 and 3.6.
Other than changes in test configuration, there are no substantive
changes from 0.2.

Release 0.2 (2014-10-09)
Features

Better fallback values.

Now, by default, if an attribute is missing (which can happen, e.g.,
for %(request.method)s is there is no current request) it is
rendered as <?attribute-name?>
(e.g. "<?request.method?>".)
There is now a syntax for explicitly specifying fallback values. E.g.
"%(request.method|(no-request))" which will format to (no request),
if there is no current request (or if the current request does not have
a method attribute.)

Dict-like access to values

When looking up a dotted name, if an attribute can not be found,
dict-style (__getitem__) lookup will be attempted.
E.g. "%(request.matchdict.arg)" will get at
request.matchdict['arg'].

Release 0.1.1 (2014-10-02)
Bugs Fixed

If an exception is thrown by a request property, render it as None.
Disable logging during log formatting to prevent recursion if a request
property generates a log message.

Release 0.1 (2014-10-02)

Initial release