forked from VimPlug/jedi
311 lines
9.9 KiB
Python
311 lines
9.9 KiB
Python
"""
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Makes it possible to do the compiled analysis in a subprocess. This has two
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goals:
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1. Making it safer - Segfaults and RuntimeErrors as well as stdout/stderr can
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be ignored and dealt with.
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2. Make it possible to handle different Python versions as well as virtualenvs.
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"""
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import os
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import sys
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import subprocess
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import weakref
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import pickle
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from functools import partial
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from jedi._compatibility import queue, is_py3, force_unicode
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from jedi.cache import memoize_method
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from jedi.evaluate.compiled.subprocess import functions
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from jedi.evaluate.compiled.access import DirectObjectAccess, AccessPath, \
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SignatureParam
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_PICKLE_PROTOCOL = 2
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_subprocesses = {}
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_MAIN_PATH = os.path.join(os.path.dirname(__file__), '__main__.py')
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def get_subprocess(executable):
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try:
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return _subprocesses[executable]
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except KeyError:
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sub = _subprocesses[executable] = _CompiledSubprocess(executable)
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return sub
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def _pickle_load(file):
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if is_py3:
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return pickle.load(file, encoding='bytes')
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else:
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return pickle.load(file)
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def _get_function(name):
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return getattr(functions, name)
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class _EvaluatorProcess(object):
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def __init__(self, evaluator):
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self._evaluator_weakref = weakref.ref(evaluator)
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self._evaluator_id = id(evaluator)
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self._handles = {}
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def get_or_create_access_handle(self, obj):
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id_ = id(obj)
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try:
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return self.get_access_handle(id_)
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except KeyError:
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access = DirectObjectAccess(self._evaluator_weakref(), obj)
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handle = AccessHandle(self, access, id_)
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self.set_access_handle(handle)
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return handle
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def get_access_handle(self, id_):
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return self._handles[id_]
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def set_access_handle(self, handle):
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self._handles[handle.id] = handle
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class EvaluatorSameProcess(_EvaluatorProcess):
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"""
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Basically just an easy access to functions.py. It has the same API
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as EvaluatorSubprocess and does the same thing without using a subprocess.
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This is necessary for the Interpreter process.
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"""
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def __getattr__(self, name):
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return partial(_get_function(name), self._evaluator_weakref())
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class EvaluatorSubprocess(_EvaluatorProcess):
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def __init__(self, evaluator, compiled_subprocess):
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super(EvaluatorSubprocess, self).__init__(evaluator)
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self._used = False
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self._compiled_subprocess = compiled_subprocess
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def __getattr__(self, name):
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func = _get_function(name)
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def wrapper(*args, **kwargs):
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self._used = True
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result = self._compiled_subprocess.run(
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self._evaluator_weakref(),
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func,
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args=args,
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kwargs=kwargs,
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)
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# IMO it should be possible to create a hook in pickle.load to
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# mess with the loaded objects. However it's extremely complicated
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# to work around this so just do it with this call. ~ dave
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return self._convert_access_handles(result)
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return wrapper
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def _convert_access_handles(self, obj):
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if isinstance(obj, SignatureParam):
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return SignatureParam(*self._convert_access_handles(tuple(obj)))
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elif isinstance(obj, tuple):
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return tuple(self._convert_access_handles(o) for o in obj)
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elif isinstance(obj, list):
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return [self._convert_access_handles(o) for o in obj]
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elif isinstance(obj, AccessHandle):
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try:
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# Rewrite the access handle to one we're already having.
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obj = self.get_access_handle(obj.id)
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except KeyError:
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obj.add_subprocess(self)
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self.set_access_handle(obj)
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elif isinstance(obj, AccessPath):
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return AccessPath(self._convert_access_handles(obj.accesses))
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return obj
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def __del__(self):
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if self._used:
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self._compiled_subprocess.delete_evaluator(self._evaluator_id)
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class _Subprocess(object):
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def __init__(self, args):
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self._args = args
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@property
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@memoize_method
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def _process(self):
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return subprocess.Popen(
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self._args,
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stdin=subprocess.PIPE,
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stdout=subprocess.PIPE,
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# stderr=subprocess.PIPE
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)
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def _send(self, evaluator_id, function, args=(), kwargs={}):
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data = evaluator_id, function, args, kwargs
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pickle.dump(data, self._process.stdin, protocol=_PICKLE_PROTOCOL)
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self._process.stdin.flush()
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is_exception, result = _pickle_load(self._process.stdout)
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if is_exception:
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raise result
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return result
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def terminate(self):
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self._process.terminate()
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def kill(self):
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self._process.kill()
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class _CompiledSubprocess(_Subprocess):
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def __init__(self, executable):
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parso_path = sys.modules['parso'].__file__
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super(_CompiledSubprocess, self).__init__(
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(executable,
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_MAIN_PATH,
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os.path.dirname(os.path.dirname(parso_path))
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)
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)
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self._evaluator_deletion_queue = queue.deque()
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def run(self, evaluator, function, args=(), kwargs={}):
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# Delete old evaluators.
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while True:
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try:
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evaluator_id = self._evaluator_deletion_queue.pop()
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except IndexError:
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break
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else:
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self._send(evaluator_id, None)
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assert callable(function)
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return self._send(id(evaluator), function, args, kwargs)
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def get_sys_path(self):
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return self._send(None, functions.get_sys_path, (), {})
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def delete_evaluator(self, evaluator_id):
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"""
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Currently we are not deleting evalutors instantly. They only get
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deleted once the subprocess is used again. It would probably a better
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solution to move all of this into a thread. However, the memory usage
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of a single evaluator shouldn't be that high.
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"""
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# With an argument - the evaluator gets deleted.
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self._evaluator_deletion_queue.append(evaluator_id)
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class Listener(object):
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def __init__(self):
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self._evaluators = {}
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# TODO refactor so we don't need to process anymore just handle
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# controlling.
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self._process = _EvaluatorProcess(Listener)
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def _get_evaluator(self, function, evaluator_id):
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from jedi.evaluate import Evaluator, project
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try:
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evaluator = self._evaluators[evaluator_id]
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except KeyError:
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from jedi.api.environment import InterpreterEnvironment
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evaluator = Evaluator(
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project=project.Project(),
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environment=InterpreterEnvironment()
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)
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self._evaluators[evaluator_id] = evaluator
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return evaluator
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def _run(self, evaluator_id, function, args, kwargs):
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if evaluator_id is None:
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return function(*args, **kwargs)
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elif function is None:
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del self._evaluators[evaluator_id]
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else:
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evaluator = self._get_evaluator(function, evaluator_id)
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# Exchange all handles
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args = list(args)
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for i, arg in enumerate(args):
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if isinstance(arg, AccessHandle):
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args[i] = evaluator.compiled_subprocess.get_access_handle(arg.id)
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for key, value in kwargs.items():
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if isinstance(value, AccessHandle):
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kwargs[key] = evaluator.compiled_subprocess.get_access_handle(value.id)
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return function(evaluator, *args, **kwargs)
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def listen(self):
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stdout = sys.stdout
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stdin = sys.stdin
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if sys.version_info[0] > 2:
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stdout = stdout.buffer
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stdin = stdin.buffer
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while True:
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try:
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payload = _pickle_load(stdin)
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except EOFError:
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# It looks like the parent process closed. Don't make a big fuss
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# here and just exit.
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exit(1)
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try:
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result = False, self._run(*payload)
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except Exception as e:
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result = True, e
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pickle.dump(result, file=stdout, protocol=_PICKLE_PROTOCOL)
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stdout.flush()
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class AccessHandle(object):
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def __init__(self, subprocess, access, id_):
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self.access = access
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self._subprocess = subprocess
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self.id = id_
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def add_subprocess(self, subprocess):
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self._subprocess = subprocess
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def __repr__(self):
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try:
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detail = self.access
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except AttributeError:
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detail = '#' + str(self.id)
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return '<%s of %s>' % (self.__class__.__name__, detail)
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def __getstate__(self):
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return self.id
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def __setstate__(self, state):
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self.id = state
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def __getattr__(self, name):
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if name in ('id', 'access') or name.startswith('_'):
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raise AttributeError("Something went wrong with unpickling")
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#if not is_py3: print >> sys.stderr, name
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#print('getattr', name, file=sys.stderr)
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return partial(self._workaround, force_unicode(name))
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def _workaround(self, name, *args, **kwargs):
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"""
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TODO Currently we're passing slice objects around. This should not
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happen. They are also the only unhashable objects that we're passing
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around.
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"""
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# Python 2 compatibility
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kwargs = {force_unicode(key): value for key, value in kwargs.items()}
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if args and isinstance(args[0], slice):
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return self._subprocess.get_compiled_method_return(self.id, name, *args, **kwargs)
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return self._cached_results(name, *args, **kwargs)
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@memoize_method
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def _cached_results(self, name, *args, **kwargs):
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#if type(self._subprocess) == EvaluatorSubprocess:
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#print(name, args, kwargs,
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#self._subprocess.get_compiled_method_return(self.id, name, *args, **kwargs)
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#)
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return self._subprocess.get_compiled_method_return(self.id, name, *args, **kwargs)
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