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Porting zerobin to python 3

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sametmax
2015-05-10 19:19:02 +02:00
parent 391df055f9
commit 9b84122414
137 changed files with 22928 additions and 4370 deletions
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161
libs/cherrypy/lib/caching.py
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@@ -1,7 +1,7 @@
"""
CherryPy implements a simple caching system as a pluggable Tool. This tool tries
to be an (in-process) HTTP/1.1-compliant cache. It's not quite there yet, but
it's probably good enough for most sites.
CherryPy implements a simple caching system as a pluggable Tool. This tool
tries to be an (in-process) HTTP/1.1-compliant cache. It's not quite there
yet, but it's probably good enough for most sites.
In general, GET responses are cached (along with selecting headers) and, if
another request arrives for the same resource, the caching Tool will return 304
@@ -9,8 +9,8 @@ Not Modified if possible, or serve the cached response otherwise. It also sets
request.cached to True if serving a cached representation, and sets
request.cacheable to False (so it doesn't get cached again).
If POST, PUT, or DELETE requests are made for a cached resource, they invalidate
(delete) any cached response.
If POST, PUT, or DELETE requests are made for a cached resource, they
invalidate (delete) any cached response.
Usage
=====
@@ -39,58 +39,58 @@ import time
import cherrypy
from cherrypy.lib import cptools, httputil
from cherrypy._cpcompat import copyitems, ntob, set_daemon, sorted
from cherrypy._cpcompat import copyitems, ntob, set_daemon, sorted, Event
class Cache(object):
"""Base class for Cache implementations."""
def get(self):
"""Return the current variant if in the cache, else None."""
raise NotImplemented
def put(self, obj, size):
"""Store the current variant in the cache."""
raise NotImplemented
def delete(self):
"""Remove ALL cached variants of the current resource."""
raise NotImplemented
def clear(self):
"""Reset the cache to its initial, empty state."""
raise NotImplemented
# ------------------------------- Memory Cache ------------------------------- #
# ------------------------------ Memory Cache ------------------------------- #
class AntiStampedeCache(dict):
"""A storage system for cached items which reduces stampede collisions."""
def wait(self, key, timeout=5, debug=False):
"""Return the cached value for the given key, or None.
If timeout is not None, and the value is already
being calculated by another thread, wait until the given timeout has
elapsed. If the value is available before the timeout expires, it is
returned. If not, None is returned, and a sentinel placed in the cache
to signal other threads to wait.
If timeout is None, no waiting is performed nor sentinels used.
"""
value = self.get(key)
if isinstance(value, threading._Event):
if isinstance(value, Event):
if timeout is None:
# Ignore the other thread and recalc it ourselves.
if debug:
cherrypy.log('No timeout', 'TOOLS.CACHING')
return None
# Wait until it's done or times out.
if debug:
cherrypy.log('Waiting up to %s seconds' % timeout, 'TOOLS.CACHING')
cherrypy.log('Waiting up to %s seconds' %
timeout, 'TOOLS.CACHING')
value.wait(timeout)
if value.result is not None:
# The other thread finished its calculation. Use it.
@@ -104,7 +104,7 @@ class AntiStampedeCache(dict):
e = threading.Event()
e.result = None
dict.__setitem__(self, key, e)
return None
elif value is None:
# Stick an Event in the slot so other threads wait
@@ -115,12 +115,12 @@ class AntiStampedeCache(dict):
e.result = None
dict.__setitem__(self, key, e)
return value
def __setitem__(self, key, value):
"""Set the cached value for the given key."""
existing = self.get(key)
dict.__setitem__(self, key, value)
if isinstance(existing, threading._Event):
if isinstance(existing, Event):
# Set Event.result so other threads waiting on it have
# immediate access without needing to poll the cache again.
existing.result = value
@@ -128,49 +128,51 @@ class AntiStampedeCache(dict):
class MemoryCache(Cache):
"""An in-memory cache for varying response content.
Each key in self.store is a URI, and each value is an AntiStampedeCache.
The response for any given URI may vary based on the values of
"selecting request headers"; that is, those named in the Vary
response header. We assume the list of header names to be constant
for each URI throughout the lifetime of the application, and store
that list in ``self.store[uri].selecting_headers``.
The items contained in ``self.store[uri]`` have keys which are tuples of
request header values (in the same order as the names in its
selecting_headers), and values which are the actual responses.
"""
maxobjects = 1000
"""The maximum number of cached objects; defaults to 1000."""
maxobj_size = 100000
"""The maximum size of each cached object in bytes; defaults to 100 KB."""
maxsize = 10000000
"""The maximum size of the entire cache in bytes; defaults to 10 MB."""
delay = 600
"""Seconds until the cached content expires; defaults to 600 (10 minutes)."""
"""Seconds until the cached content expires; defaults to 600 (10 minutes).
"""
antistampede_timeout = 5
"""Seconds to wait for other threads to release a cache lock."""
expire_freq = 0.1
"""Seconds to sleep between cache expiration sweeps."""
debug = False
def __init__(self):
self.clear()
# Run self.expire_cache in a separate daemon thread.
t = threading.Thread(target=self.expire_cache, name='expire_cache')
self.expiration_thread = t
set_daemon(t, True)
t.start()
def clear(self):
"""Reset the cache to its initial, empty state."""
self.store = {}
@@ -181,10 +183,10 @@ class MemoryCache(Cache):
self.tot_expires = 0
self.tot_non_modified = 0
self.cursize = 0
def expire_cache(self):
"""Continuously examine cached objects, expiring stale ones.
This function is designed to be run in its own daemon thread,
referenced at ``self.expiration_thread``.
"""
@@ -207,17 +209,17 @@ class MemoryCache(Cache):
pass
del self.expirations[expiration_time]
time.sleep(self.expire_freq)
def get(self):
"""Return the current variant if in the cache, else None."""
request = cherrypy.serving.request
self.tot_gets += 1
uri = cherrypy.url(qs=request.query_string)
uricache = self.store.get(uri)
if uricache is None:
return None
header_values = [request.headers.get(h, '')
for h in uricache.selecting_headers]
variant = uricache.wait(key=tuple(sorted(header_values)),
@@ -226,12 +228,12 @@ class MemoryCache(Cache):
if variant is not None:
self.tot_hist += 1
return variant
def put(self, variant, size):
"""Store the current variant in the cache."""
request = cherrypy.serving.request
response = cherrypy.serving.response
uri = cherrypy.url(qs=request.query_string)
uricache = self.store.get(uri)
if uricache is None:
@@ -239,24 +241,24 @@ class MemoryCache(Cache):
uricache.selecting_headers = [
e.value for e in response.headers.elements('Vary')]
self.store[uri] = uricache
if len(self.store) < self.maxobjects:
total_size = self.cursize + size
# checks if there's space for the object
if (size < self.maxobj_size and total_size < self.maxsize):
# add to the expirations list
expiration_time = response.time + self.delay
bucket = self.expirations.setdefault(expiration_time, [])
bucket.append((size, uri, uricache.selecting_headers))
# add to the cache
header_values = [request.headers.get(h, '')
for h in uricache.selecting_headers]
uricache[tuple(sorted(header_values))] = variant
self.tot_puts += 1
self.cursize = total_size
def delete(self):
"""Remove ALL cached variants of the current resource."""
uri = cherrypy.url(qs=cherrypy.serving.request.query_string)
@@ -265,12 +267,12 @@ class MemoryCache(Cache):
def get(invalid_methods=("POST", "PUT", "DELETE"), debug=False, **kwargs):
"""Try to obtain cached output. If fresh enough, raise HTTPError(304).
If POST, PUT, or DELETE:
* invalidates (deletes) any cached response for this resource
* sets request.cached = False
* sets request.cacheable = False
else if a cached copy exists:
* sets request.cached = True
* sets request.cacheable = False
@@ -280,7 +282,7 @@ def get(invalid_methods=("POST", "PUT", "DELETE"), debug=False, **kwargs):
if necessary.
* sets response.status and response.body to the cached values
* returns True
otherwise:
* sets request.cached = False
* sets request.cacheable = True
@@ -288,16 +290,16 @@ def get(invalid_methods=("POST", "PUT", "DELETE"), debug=False, **kwargs):
"""
request = cherrypy.serving.request
response = cherrypy.serving.response
if not hasattr(cherrypy, "_cache"):
# Make a process-wide Cache object.
cherrypy._cache = kwargs.pop("cache_class", MemoryCache)()
# Take all remaining kwargs and set them on the Cache object.
for k, v in kwargs.items():
setattr(cherrypy._cache, k, v)
cherrypy._cache.debug = debug
# POST, PUT, DELETE should invalidate (delete) the cached copy.
# See http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.10.
if request.method in invalid_methods:
@@ -308,12 +310,12 @@ def get(invalid_methods=("POST", "PUT", "DELETE"), debug=False, **kwargs):
request.cached = False
request.cacheable = False
return False
if 'no-cache' in [e.value for e in request.headers.elements('Pragma')]:
request.cached = False
request.cacheable = True
return False
cache_data = cherrypy._cache.get()
request.cached = bool(cache_data)
request.cacheable = not request.cached
@@ -325,17 +327,19 @@ def get(invalid_methods=("POST", "PUT", "DELETE"), debug=False, **kwargs):
directive = atoms.pop(0)
if directive == 'max-age':
if len(atoms) != 1 or not atoms[0].isdigit():
raise cherrypy.HTTPError(400, "Invalid Cache-Control header")
raise cherrypy.HTTPError(
400, "Invalid Cache-Control header")
max_age = int(atoms[0])
break
elif directive == 'no-cache':
if debug:
cherrypy.log('Ignoring cache due to Cache-Control: no-cache',
'TOOLS.CACHING')
cherrypy.log(
'Ignoring cache due to Cache-Control: no-cache',
'TOOLS.CACHING')
request.cached = False
request.cacheable = True
return False
if debug:
cherrypy.log('Reading response from cache', 'TOOLS.CACHING')
s, h, b, create_time = cache_data
@@ -347,15 +351,16 @@ def get(invalid_methods=("POST", "PUT", "DELETE"), debug=False, **kwargs):
request.cached = False
request.cacheable = True
return False
# Copy the response headers. See http://www.cherrypy.org/ticket/721.
# Copy the response headers. See
# https://bitbucket.org/cherrypy/cherrypy/issue/721.
response.headers = rh = httputil.HeaderMap()
for k in h:
dict.__setitem__(rh, k, dict.__getitem__(h, k))
# Add the required Age header
response.headers["Age"] = str(age)
try:
# Note that validate_since depends on a Last-Modified header;
# this was put into the cached copy, and should have been
@@ -366,7 +371,7 @@ def get(invalid_methods=("POST", "PUT", "DELETE"), debug=False, **kwargs):
if x.status == 304:
cherrypy._cache.tot_non_modified += 1
raise
# serve it & get out from the request
response.status = s
response.body = b
@@ -379,29 +384,29 @@ def get(invalid_methods=("POST", "PUT", "DELETE"), debug=False, **kwargs):
def tee_output():
"""Tee response output to cache storage. Internal."""
# Used by CachingTool by attaching to request.hooks
request = cherrypy.serving.request
if 'no-store' in request.headers.values('Cache-Control'):
return
def tee(body):
"""Tee response.body into a list."""
if ('no-cache' in response.headers.values('Pragma') or
'no-store' in response.headers.values('Cache-Control')):
'no-store' in response.headers.values('Cache-Control')):
for chunk in body:
yield chunk
return
output = []
for chunk in body:
output.append(chunk)
yield chunk
# save the cache data
body = ntob('').join(output)
cherrypy._cache.put((response.status, response.headers or {},
body, response.time), len(body))
response = cherrypy.serving.response
response.body = tee(response.body)
@@ -415,25 +420,25 @@ def expires(secs=0, force=False, debug=False):
expire. The 'Expires' header will be set to response.time + secs.
If secs is zero, the 'Expires' header is set one year in the past, and
the following "cache prevention" headers are also set:
* Pragma: no-cache
* Cache-Control': no-cache, must-revalidate
force
If False, the following headers are checked:
* Etag
* Last-Modified
* Age
* Expires
If any are already present, none of the above response headers are set.
"""
response = cherrypy.serving.response
headers = response.headers
cacheable = False
if not force:
# some header names that indicate that the response can be cached
@@ -441,7 +446,7 @@ def expires(secs=0, force=False, debug=False):
if indicator in headers:
cacheable = True
break
if not cacheable and not force:
if debug:
cherrypy.log('request is not cacheable', 'TOOLS.EXPIRES')
@@ -450,7 +455,7 @@ def expires(secs=0, force=False, debug=False):
cherrypy.log('request is cacheable', 'TOOLS.EXPIRES')
if isinstance(secs, datetime.timedelta):
secs = (86400 * secs.days) + secs.seconds
if secs == 0:
if force or ("Pragma" not in headers):
headers["Pragma"] = "no-cache"