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executable file
·336 lines (273 loc) · 9.82 KB
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"""
This caching is very important for speed and memory optimizations. There's
nothing really spectacular, just some decorators. The following cache types are
available:
- module caching (`load_parser` and `save_parser`), which uses pickle and is
really important to assure low load times of modules like ``numpy``.
- ``time_cache`` can be used to cache something for just a limited time span,
which can be useful if there's user interaction and the user cannot react
faster than a certain time.
This module is one of the reasons why |jedi| is not thread-safe. As you can see
there are global variables, which are holding the cache information. Some of
these variables are being cleaned after every API usage.
"""
import time
import os
import sys
import json
import hashlib
import gc
import inspect
import shutil
import re
try:
import cPickle as pickle
except ImportError:
import pickle
from jedi import settings
from jedi import common
from jedi import debug
_time_caches = {}
# for fast_parser, should not be deleted
parser_cache = {}
class ParserCacheItem(object):
def __init__(self, parser, change_time=None):
self.parser = parser
if change_time is None:
change_time = time.time()
self.change_time = change_time
def clear_time_caches(delete_all=False):
""" Jedi caches many things, that should be completed after each completion
finishes.
:param delete_all: Deletes also the cache that is normally not deleted,
like parser cache, which is important for faster parsing.
"""
global _time_caches
if delete_all:
for cache in _time_caches.values():
cache.clear()
parser_cache.clear()
else:
# normally just kill the expired entries, not all
for tc in _time_caches.values():
# check time_cache for expired entries
for key, (t, value) in list(tc.items()):
if t < time.time():
# delete expired entries
del tc[key]
def time_cache(time_add_setting):
"""
s
This decorator works as follows: Call it with a setting and after that
use the function with a callable that returns the key.
But: This function is only called if the key is not available. After a
certain amount of time (`time_add_setting`) the cache is invalid.
"""
def _temp(key_func):
dct = {}
_time_caches[time_add_setting] = dct
def wrapper(*args, **kwargs):
generator = key_func(*args, **kwargs)
key = next(generator)
try:
expiry, value = dct[key]
if expiry > time.time():
return value
except KeyError:
pass
value = next(generator)
time_add = getattr(settings, time_add_setting)
if key is not None:
dct[key] = time.time() + time_add, value
return value
return wrapper
return _temp
@time_cache("call_signatures_validity")
def cache_call_signatures(evaluator, call, source, user_pos):
"""This function calculates the cache key."""
index = user_pos[0] - 1
lines = common.splitlines(source)
before_cursor = lines[index][:user_pos[1]]
other_lines = lines[call.start_pos[0]:index]
whole = '\n'.join(other_lines + [before_cursor])
before_bracket = re.match(r'.*\(', whole, re.DOTALL)
module_path = call.get_parent_until().path
yield None if module_path is None else (module_path, before_bracket, call.start_pos)
yield evaluator.eval_element(call)
def underscore_memoization(func):
"""
Decorator for methods::
class A(object):
def x(self):
if self._x:
self._x = 10
return self._x
Becomes::
class A(object):
@underscore_memoization
def x(self):
return 10
A now has an attribute ``_x`` written by this decorator.
"""
name = '_' + func.__name__
def wrapper(self):
try:
return getattr(self, name)
except AttributeError:
result = func(self)
if inspect.isgenerator(result):
result = list(result)
setattr(self, name, result)
return result
return wrapper
def memoize_method(method):
"""A normal memoize function."""
def wrapper(self, *args, **kwargs):
dct = self.__dict__.setdefault('_memoize_method_dct', {})
key = (args, frozenset(kwargs.items()))
try:
return dct[key]
except KeyError:
result = method(self, *args, **kwargs)
dct[key] = result
return result
return wrapper
def cache_star_import(func):
@time_cache("star_import_cache_validity")
def wrapper(self):
yield self.base # The cache key
yield func(self)
return wrapper
def _invalidate_star_import_cache_module(module, only_main=False):
""" Important if some new modules are being reparsed """
try:
t, modules = _time_caches['star_import_cache_validity'][module]
except KeyError:
pass
else:
del _time_caches['star_import_cache_validity'][module]
def invalidate_star_import_cache(path):
"""On success returns True."""
try:
parser_cache_item = parser_cache[path]
except KeyError:
pass
else:
_invalidate_star_import_cache_module(parser_cache_item.parser.module)
def load_parser(path):
"""
Returns the module or None, if it fails.
"""
p_time = os.path.getmtime(path) if path else None
try:
parser_cache_item = parser_cache[path]
if not path or p_time <= parser_cache_item.change_time:
return parser_cache_item.parser
else:
# In case there is already a module cached and this module
# has to be reparsed, we also need to invalidate the import
# caches.
_invalidate_star_import_cache_module(parser_cache_item.parser.module)
except KeyError:
if settings.use_filesystem_cache:
return ParserPickling.load_parser(path, p_time)
def save_parser(path, parser, pickling=True):
try:
p_time = None if path is None else os.path.getmtime(path)
except OSError:
p_time = None
pickling = False
item = ParserCacheItem(parser, p_time)
parser_cache[path] = item
if settings.use_filesystem_cache and pickling:
ParserPickling.save_parser(path, item)
class ParserPickling(object):
version = 24
"""
Version number (integer) for file system cache.
Increment this number when there are any incompatible changes in
parser representation classes. For example, the following changes
are regarded as incompatible.
- Class name is changed.
- Class is moved to another module.
- Defined slot of the class is changed.
"""
def __init__(self):
self.__index = None
self.py_tag = 'cpython-%s%s' % sys.version_info[:2]
"""
Short name for distinguish Python implementations and versions.
It's like `sys.implementation.cache_tag` but for Python < 3.3
we generate something similar. See:
http://docs.python.org/3/library/sys.html#sys.implementation
.. todo:: Detect interpreter (e.g., PyPy).
"""
def load_parser(self, path, original_changed_time):
try:
pickle_changed_time = self._index[path]
except KeyError:
return None
if original_changed_time is not None \
and pickle_changed_time < original_changed_time:
# the pickle file is outdated
return None
with open(self._get_hashed_path(path), 'rb') as f:
try:
gc.disable()
parser_cache_item = pickle.load(f)
finally:
gc.enable()
debug.dbg('pickle loaded: %s', path)
parser_cache[path] = parser_cache_item
return parser_cache_item.parser
def save_parser(self, path, parser_cache_item):
self.__index = None
try:
files = self._index
except KeyError:
files = {}
self._index = files
with open(self._get_hashed_path(path), 'wb') as f:
pickle.dump(parser_cache_item, f, pickle.HIGHEST_PROTOCOL)
files[path] = parser_cache_item.change_time
self._flush_index()
@property
def _index(self):
if self.__index is None:
try:
with open(self._get_path('index.json')) as f:
data = json.load(f)
except (IOError, ValueError):
self.__index = {}
else:
# 0 means version is not defined (= always delete cache):
if data.get('version', 0) != self.version:
self.clear_cache()
self.__index = {}
else:
self.__index = data['index']
return self.__index
def _remove_old_modules(self):
# TODO use
change = False
if change:
self._flush_index(self)
self._index # reload index
def _flush_index(self):
data = {'version': self.version, 'index': self._index}
with open(self._get_path('index.json'), 'w') as f:
json.dump(data, f)
self.__index = None
def clear_cache(self):
shutil.rmtree(self._cache_directory())
def _get_hashed_path(self, path):
return self._get_path('%s.pkl' % hashlib.md5(path.encode("utf-8")).hexdigest())
def _get_path(self, file):
dir = self._cache_directory()
if not os.path.exists(dir):
os.makedirs(dir)
return os.path.join(dir, file)
def _cache_directory(self):
return os.path.join(settings.cache_directory, self.py_tag)
# is a singleton
ParserPickling = ParserPickling()
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