def fetch(self, environ):
if environ.get('REQUEST_METHOD', 'GET') not in self.allowed_methods:
return
request_headers = list(parse_headers(environ))
# if a Cache-Control/Pragma: no-cache header is in the request,
# and if honor_shift_reload is true, we don't serve it from cache
if self.honor_shift_reload:
if self._check_no_cache(request_headers, environ):
return
# we don't try to serve range requests up from the cache
if header_value(request_headers, 'Range'):
return
# we don't try to serve conditional requests up from cache
for conditional in ('If-Modified-Since', 'If-None-Match',
'If-Match'): # XXX other conditionals?
if header_value(request_headers, conditional):
return
url = construct_url(environ)
entries = self.storage.fetch(url)
if entries:
matching = self._discriminate(entries, request_headers, environ)
if not matching:
return
now = time.time()
discrims, expires, status, response_headers, body, extras = matching
if expires > now:
return status, response_headers, body
def fetch(self, environ):
if environ.get('REQUEST_METHOD', 'GET') not in self.allowed_methods:
return
request_headers = list(parse_headers(environ))
# if a Cache-Control/Pragma: no-cache header is in the request,
# and if honor_shift_reload is true, we don't serve it from cache
if self.honor_shift_reload:
if self._check_no_cache(request_headers, environ):
return
# we don't try to serve range requests up from the cache
if header_value(request_headers, 'Range'):
return
# we don't try to serve conditional requests up from cache
for conditional in ('If-Modified-Since', 'If-None-Match',
'If-Match'): # XXX other conditionals?
if header_value(request_headers, conditional):
return
url = construct_url(environ)
entries = self.storage.fetch(url)
if entries:
matching = self._discriminate(entries, request_headers, environ)
if not matching:
return
now = time.time()
discrims, expires, status, response_headers, body, extras = matching
if expires > now:
return status, response_headers, body
def store(self, status, response_headers, environ):
request_headers = list(parse_headers(environ))
# abort if we shouldn't store this response
request_method = environ.get('REQUEST_METHOD', 'GET')
if request_method not in self.allowed_methods:
return
if not (status.startswith('200') or status.startswith('203')):
return
if environ['wsgi.url_scheme'] == 'https':
if not self.store_https_responses:
return
if self._check_no_cache(response_headers, environ):
return
cc_header = header_value(response_headers, 'Cache-Control')
if cc_header:
cc_parts = parse_cache_control_header(cc_header)
try:
if int(cc_parts.get('max-age', '0')) == 0:
return
except ValueError:
return
# if we didn't abort due to any condition above, store the response
vary_header_names = []
vary = header_value(response_headers, 'Vary')
if vary is not None:
vary_header_names.extend(
[ x.strip().lower() for x in vary.split(',') ])
if self.always_vary_on_headers:
vary_header_names.extend(list(self.always_vary_on_headers))
if '*' in vary_header_names:
return
discriminators = Discriminators(request_headers, environ,
vary_header_names, self.always_vary_on_environ)
headers = endtoend(response_headers)
url = construct_url(environ)
# Response headers won't have a date if we aren't proxying to
# another http server on our right hand side.
date = header_value(response_headers, 'Date')
if date is None:
date = time.time()
else:
date = calendar.timegm(parsedate_tz(date))
expires = self._expires(date, response_headers)
# XXX purge?
return self.storage.store(
url,
discriminators,
expires,
status,
headers,
)
def store(self, status, response_headers, environ):
request_headers = list(parse_headers(environ))
# abort if we shouldn't store this response
request_method = environ.get('REQUEST_METHOD', 'GET')
if request_method not in self.allowed_methods:
return
if not (status.startswith('200') or status.startswith('203')):
return
if environ['wsgi.url_scheme'] == 'https':
if not self.store_https_responses:
return
if self._check_no_cache(response_headers, environ):
return
cc_header = header_value(response_headers, 'Cache-Control')
if cc_header:
cc_parts = parse_cache_control_header(cc_header)
try:
if int(cc_parts.get('max-age', '0')) == 0:
return
except ValueError:
return
# if we didn't abort due to any condition above, store the response
vary_header_names = []
vary = header_value(response_headers, 'Vary')
if vary is not None:
vary_header_names.extend(
[x.strip().lower() for x in vary.split(',')])
if self.always_vary_on_headers:
vary_header_names.extend(list(self.always_vary_on_headers))
if '*' in vary_header_names:
return
discriminators = []
for header_name in vary_header_names:
value = header_value(request_headers, header_name)
if value is not None:
discriminators.append(('vary', (header_name, value)))
for varname in self.always_vary_on_environ:
value = environ.get(varname)
if value is not None:
discriminators.append(('env', (varname, value)))
discriminators = tuple(sorted(discriminators))
headers = endtoend(response_headers)
url = construct_url(environ)
# Response headers won't have a date if we aren't proxying to
# another http server on our right hand side.
date = header_value(response_headers, 'Date')
if date is None:
date = time.time()
else:
date = calendar.timegm(parsedate_tz(date))
expires = self._expires(date, response_headers)
# XXX purge?
return self.storage.store(
url,
discriminators,
expires,
status,
headers,
)
def headers(self):
return dict(parse_headers(self.environ))
def headers( self ):
return dict( parse_headers( self.environ ) )