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"""
Useful testing utilities.
This module is considered public API.
"""
import time
import six
from pymemcache.exceptions import MemcacheIllegalInputError
from pymemcache.serde import LegacyWrappingSerde
from pymemcache.client.base import check_key_helper
class MockMemcacheClient(object):
"""
A (partial) in-memory mock for Clients.
"""
def __init__(self,
server=None,
serde=None,
serializer=None,
deserializer=None,
connect_timeout=None,
timeout=None,
no_delay=False,
ignore_exc=False,
default_noreply=True,
allow_unicode_keys=False,
encoding='ascii'):
self._contents = {}
self.serde = serde or LegacyWrappingSerde(serializer, deserializer)
self.allow_unicode_keys = allow_unicode_keys
# Unused, but present for interface compatibility
self.server = server
self.connect_timeout = connect_timeout
self.timeout = timeout
self.no_delay = no_delay
self.ignore_exc = ignore_exc
self.encoding = encoding
def check_key(self, key):
"""Checks key and add key_prefix."""
return check_key_helper(key, allow_unicode_keys=self.allow_unicode_keys)
def clear(self):
"""Method used to clear/reset mock cache"""
self._contents.clear()
def get(self, key, default=None):
key = self.check_key(key)
if key not in self._contents:
return default
expire, value, flags = self._contents[key]
if expire and expire < time.time():
del self._contents[key]
return default
return self.serde.deserialize(key, value, flags)
def get_many(self, keys):
out = {}
for key in keys:
value = self.get(key)
if value is not None:
out[key] = value
return out
get_multi = get_many
def set(self, key, value, expire=0, noreply=True, flags=0):
key = self.check_key(key)
if (isinstance(value, six.string_types) and
not isinstance(value, six.binary_type)):
try:
value = value.encode(self.encoding)
except (UnicodeEncodeError, UnicodeDecodeError):
raise MemcacheIllegalInputError
value, flags = self.serde.serialize(key, value)
if expire:
expire += time.time()
self._contents[key] = expire, value, flags
return True
def set_many(self, values, expire=None, noreply=True):
for key, value in six.iteritems(values):
self.set(key, value, expire, noreply)
return []
set_multi = set_many
def incr(self, key, value, noreply=False):
current = self.get(key)
present = current is not None
if present:
self.set(key, current + value, noreply=noreply)
return None if noreply or not present else current + value
def decr(self, key, value, noreply=False):
current = self.get(key)
if current is None:
return
self.set(key, current - value, noreply=noreply)
return current - value
def add(self, key, value, expire=None, noreply=True):
current = self.get(key)
present = current is not None
if not present:
self.set(key, value, expire, noreply)
return not present
def delete(self, key, noreply=True):
current = self._contents.pop(key, None)
present = current is not None
return noreply or present
def delete_many(self, keys, noreply=True):
for key in keys:
self.delete(key, noreply)
return True
def prepend(self, key, value, expire=0, noreply=None, flags=None):
current = self.get(key)
if current is not None:
if (isinstance(value, six.string_types) and
not isinstance(value, six.binary_type)):
try:
value = value.encode(self.encoding)
except (UnicodeEncodeError, UnicodeDecodeError):
raise MemcacheIllegalInputError
self.set(key, value + current)
return True
def append(self, key, value, expire=0, noreply=None, flags=None):
current = self.get(key)
if current is not None:
if (isinstance(value, six.string_types) and
not isinstance(value, six.binary_type)):
try:
value = value.encode(self.encoding)
except (UnicodeEncodeError, UnicodeDecodeError):
raise MemcacheIllegalInputError
self.set(key, current + value)
return True
delete_multi = delete_many
def stats(self):
# I make no claim that these values make any sense, but the format
# of the output is the same as for pymemcache.client.Client.stats()
return {
"version": "MockMemcacheClient",
"rusage_user": 1.0,
"rusage_system": 1.0,
"hash_is_expanding": False,
"slab_reassign_running": False,
"inter": "in-memory",
"evictions": False,
"growth_factor": 1.0,
"stat_key_prefix": "",
"umask": 0o644,
"detail_enabled": False,
"cas_enabled": False,
"auth_enabled_sasl": False,
"maxconns_fast": False,
"slab_reassign": False,
"slab_automove": False,
}
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