FM / python

/usr/lib/python3/dist-packages/twisted/python/

/usr/lib/python3/dist-packages/twisted/python

Name	Size	Mode	Actions
test/	-	0755	rm
_pydoctortemplates/	-	0755	rm
__pycache__/	-	0755	rm
compat.py	23194	0644	edit dl rm
components.py	14295	0644	edit dl rm
constants.py	544	0644	edit dl rm
context.py	4024	0644	edit dl rm
deprecate.py	26775	0644	edit dl rm
failure.py	26638	0644	edit dl rm
fakepwd.py	6138	0644	edit dl rm
filepath.py	58887	0644	edit dl rm
formmethod.py	11460	0644	edit dl rm
htmlizer.py	3541	0644	edit dl rm
lockfile.py	7718	0644	edit dl rm
log.py	22472	0644	edit dl rm
logfile.py	10083	0644	edit dl rm
modules.py	27141	0644	edit dl rm
monkey.py	2227	0644	edit dl rm
procutils.py	1419	0644	edit dl rm
randbytes.py	3959	0644	edit dl rm
rebuild.py	9268	0644	edit dl rm
reflect.py	19477	0644	edit dl rm
release.py	1192	0644	edit dl rm
roots.py	7404	0644	edit dl rm
runtime.py	6270	0644	edit dl rm
sendmsg.py	3420	0644	edit dl rm
shortcut.py	2253	0644	edit dl rm
syslog.py	3730	0644	edit dl rm
systemd.py	2834	0644	edit dl rm
text.py	5482	0644	edit dl rm
threadable.py	3297	0644	edit dl rm
threadpool.py	9840	0644	edit dl rm
twisted-completion.zsh	1371	0644	edit dl rm
url.py	244	0644	edit dl rm
urlpath.py	9084	0644	edit dl rm
usage.py	35010	0644	edit dl rm
util.py	27931	0644	edit dl rm
versions.py	322	0644	edit dl rm
win32.py	4317	0644	edit dl rm
zippath.py	9237	0644	edit dl rm
zipstream.py	9757	0644	edit dl rm
_appdirs.py	788	0644	edit dl rm
_inotify.py	3455	0644	edit dl rm
_oldstyle.py	2593	0644	edit dl rm
_release.py	18548	0644	edit dl rm
_setup.py	12953	0644	edit dl rm
_shellcomp.py	24830	0644	edit dl rm
_textattributes.py	9079	0644	edit dl rm
_tzhelper.py	3192	0644	edit dl rm
_url.py	253	0644	edit dl rm
__init__.py	674	0644	edit dl rm

Edit: /usr/lib/python3/dist-packages/twisted/python/context.py (4024B)

# -*- test-case-name: twisted.test.test_context -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Dynamic pseudo-scoping for Python.

Call functions with context.call({key: value}, func); func and
functions that it calls will be able to use 'context.get(key)' to
retrieve 'value'.

This is thread-safe.
"""

from __future__ import division, absolute_import

from threading import local

from twisted.python._oldstyle import _oldStyle

defaultContextDict = {}

setDefault = defaultContextDict.__setitem__

@_oldStyle
class ContextTracker:
    """
    A L{ContextTracker} provides a way to pass arbitrary key/value data up and
    down a call stack without passing them as parameters to the functions on
    that call stack.

This can be useful when functions on the top and bottom of the call stack
    need to cooperate but the functions in between them do not allow passing the
    necessary state.  For example::

from twisted.python.context import call, get

def handleRequest(request):
            call({'request-id': request.id}, renderRequest, request.url)

def renderRequest(url):
            renderHeader(url)
            renderBody(url)

def renderHeader(url):
            return "the header"

def renderBody(url):
            return "the body (request id=%r)" % (get("request-id"),)

This should be used sparingly, since the lack of a clear connection between
    the two halves can result in code which is difficult to understand and
    maintain.

@ivar contexts: A C{list} of C{dict}s tracking the context state.  Each new
        L{ContextTracker.callWithContext} pushes a new C{dict} onto this stack
        for the duration of the call, making the data available to the function
        called and restoring the previous data once it is complete..
    """
    def __init__(self):
        self.contexts = [defaultContextDict]

def callWithContext(self, newContext, func, *args, **kw):
        """
        Call C{func(*args, **kw)} such that the contents of C{newContext} will
        be available for it to retrieve using L{getContext}.

@param newContext: A C{dict} of data to push onto the context for the
            duration of the call to C{func}.

@param func: A callable which will be called.

@param *args: Any additional positional arguments to pass to C{func}.

@param **kw: Any additional keyword arguments to pass to C{func}.

@return: Whatever is returned by C{func}

@raise: Whatever is raised by C{func}.
        """
        self.contexts.append(newContext)
        try:
            return func(*args,**kw)
        finally:
            self.contexts.pop()

def getContext(self, key, default=None):
        """
        Retrieve the value for a key from the context.

@param key: The key to look up in the context.

@param default: The value to return if C{key} is not found in the
            context.

@return: The value most recently remembered in the context for C{key}.
        """
        for ctx in reversed(self.contexts):
            try:
                return ctx[key]
            except KeyError:
                pass
        return default

class ThreadedContextTracker(object):
    def __init__(self):
        self.storage = local()

def currentContext(self):
        try:
            return self.storage.ct
        except AttributeError:
            ct = self.storage.ct = ContextTracker()
            return ct

def callWithContext(self, ctx, func, *args, **kw):
        return self.currentContext().callWithContext(ctx, func, *args, **kw)

def getContext(self, key, default=None):
        return self.currentContext().getContext(key, default)

def installContextTracker(ctr):
    global theContextTracker
    global call
    global get

theContextTracker = ctr
    call = theContextTracker.callWithContext
    get = theContextTracker.getContext

installContextTracker(ThreadedContextTracker())

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