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processors.py
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156 lines (123 loc) · 4.41 KB
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import logging
import re
import sys
from django.conf import settings as django_settings
from django.http import Http404, HttpResponseRedirect
from django.views.decorators.http import condition
logger = logging.getLogger(__name__)
def redirect_request_processor(page, request):
"""
Returns a ``HttpResponseRedirect`` instance if the current page says
a redirect should happen.
"""
target = page.get_redirect_to_target(request)
if target:
extra_path = request._feincms_extra_context.get("extra_path", "/")
if extra_path == "/":
return HttpResponseRedirect(target)
logger.debug(
"Page redirect on '%s' not taken because extra path '%s' present",
page.get_absolute_url(),
extra_path,
)
raise Http404()
def extra_context_request_processor(page, request):
"""
Fills ``request._feincms_extra_context`` with a few useful variables.
"""
request._feincms_extra_context.update(
{
# XXX This variable name isn't accurate anymore.
"in_appcontent_subpage": False,
"extra_path": "/",
}
)
url = page.get_absolute_url()
if request.path != url:
request._feincms_extra_context.update(
{
"in_appcontent_subpage": True,
"extra_path": re.sub(
"^" + re.escape(url.rstrip("/")), "", request.path
),
}
)
class __DummyResponse(dict):
"""
This is a dummy class with enough behaviour of HttpResponse so we
can use the condition decorator without too much pain.
"""
@property
def headers(self):
return self
def has_header(self, what):
return False
def etag_request_processor(page, request):
"""
Short-circuits the request-response cycle if the ETag matches.
"""
def dummy_response_handler(*args, **kwargs):
return __DummyResponse()
def etagger(request, page, *args, **kwargs):
etag = page.etag(request)
return etag
def lastmodifier(request, page, *args, **kwargs):
lm = page.last_modified()
return lm
# Now wrap the condition decorator around our dummy handler:
# the net effect is that we will be getting a DummyResponse from
# the handler if processing is to continue and a non-DummyResponse
# (should be a "304 not modified") if the etag matches.
rsp = condition(etag_func=etagger, last_modified_func=lastmodifier)(
dummy_response_handler
)(request, page)
# If dummy then don't do anything, if a real response, return and
# thus shortcut the request processing.
if not isinstance(rsp, __DummyResponse):
return rsp
def etag_response_processor(page, request, response):
"""
Response processor to set an etag header on outgoing responses.
The Page.etag() method must return something valid as etag content
whenever you want an etag header generated.
"""
etag = page.etag(request)
if etag is not None:
response["ETag"] = '"' + etag + '"'
def debug_sql_queries_response_processor(verbose=False, file=sys.stderr):
"""
Attaches a handler which prints the query count (and optionally all
individual queries which have been executed) on the console. Does nothing
if ``DEBUG = False``.
Example::
from feincms.module.page import models, processors
models.Page.register_response_processor(
processors.debug_sql_queries_response_processor(verbose=True),
)
"""
if not django_settings.DEBUG:
return lambda page, request, response: None
def processor(page, request, response):
from django.db import connection
try:
import sqlparse
def print_sql(x):
return sqlparse.format(x, reindent=True, keyword_case="upper")
except Exception:
def print_sql(x):
return x
if verbose:
print("-" * 60, file=file)
time = 0.0
i = 0
for q in connection.queries:
i += 1
if verbose:
print(
"%d : [%s]\n%s\n" % (i, q["time"], print_sql(q["sql"])), file=file
)
time += float(q["time"])
print("-" * 60, file=file)
print("Total: %d queries, %.3f ms" % (i, time), file=file)
print("-" * 60, file=file)
return processor