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pydevd_resolver.py
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pydevd_resolver.py
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from _pydev_bundle import pydev_log
from _pydevd_bundle.pydevd_utils import hasattr_checked, DAPGrouper, Timer
from io import StringIO
import traceback
from os.path import basename
from functools import partial
from _pydevd_bundle.pydevd_constants import IS_PY36_OR_GREATER, \
MethodWrapperType, RETURN_VALUES_DICT, DebugInfoHolder, IS_PYPY, GENERATED_LEN_ATTR_NAME
from _pydevd_bundle.pydevd_safe_repr import SafeRepr
from _pydevd_bundle import pydevd_constants
TOO_LARGE_MSG = 'Maximum number of items (%s) reached. To show more items customize the value of the PYDEVD_CONTAINER_RANDOM_ACCESS_MAX_ITEMS environment variable.'
TOO_LARGE_ATTR = 'Unable to handle:'
#=======================================================================================================================
# UnableToResolveVariableException
#=======================================================================================================================
class UnableToResolveVariableException(Exception):
pass
try:
from collections import OrderedDict
except:
OrderedDict = dict
try:
import java.lang # @UnresolvedImport
except:
pass
#=======================================================================================================================
# See: pydevd_extension_api module for resolver interface
#=======================================================================================================================
def sorted_attributes_key(attr_name):
if attr_name.startswith('__'):
if attr_name.endswith('__'):
# __ double under before and after __
return (3, attr_name)
else:
# __ double under before
return (2, attr_name)
elif attr_name.startswith('_'):
# _ single under
return (1, attr_name)
else:
# Regular (Before anything)
return (0, attr_name)
#=======================================================================================================================
# DefaultResolver
#=======================================================================================================================
class DefaultResolver:
'''
DefaultResolver is the class that'll actually resolve how to show some variable.
'''
def resolve(self, var, attribute):
return getattr(var, attribute)
def get_contents_debug_adapter_protocol(self, obj, fmt=None):
if MethodWrapperType:
dct, used___dict__ = self._get_py_dictionary(obj)
else:
dct = self._get_jy_dictionary(obj)[0]
lst = sorted(dct.items(), key=lambda tup: sorted_attributes_key(tup[0]))
if used___dict__:
eval_name = '.__dict__[%s]'
else:
eval_name = '.%s'
ret = []
for attr_name, attr_value in lst:
entry = (attr_name, attr_value, eval_name % attr_name)
ret.append(entry)
return ret
def get_dictionary(self, var, names=None, used___dict__=False):
if MethodWrapperType:
return self._get_py_dictionary(var, names, used___dict__=used___dict__)[0]
else:
return self._get_jy_dictionary(var)[0]
def _get_jy_dictionary(self, obj):
ret = {}
found = java.util.HashMap()
original = obj
if hasattr_checked(obj, '__class__') and obj.__class__ == java.lang.Class:
# get info about superclasses
classes = []
classes.append(obj)
c = obj.getSuperclass()
while c != None:
classes.append(c)
c = c.getSuperclass()
# get info about interfaces
interfs = []
for obj in classes:
interfs.extend(obj.getInterfaces())
classes.extend(interfs)
# now is the time when we actually get info on the declared methods and fields
for obj in classes:
declaredMethods = obj.getDeclaredMethods()
declaredFields = obj.getDeclaredFields()
for i in range(len(declaredMethods)):
name = declaredMethods[i].getName()
ret[name] = declaredMethods[i].toString()
found.put(name, 1)
for i in range(len(declaredFields)):
name = declaredFields[i].getName()
found.put(name, 1)
# if declaredFields[i].isAccessible():
declaredFields[i].setAccessible(True)
# ret[name] = declaredFields[i].get( declaredFields[i] )
try:
ret[name] = declaredFields[i].get(original)
except:
ret[name] = declaredFields[i].toString()
# this simple dir does not always get all the info, that's why we have the part before
# (e.g.: if we do a dir on String, some methods that are from other interfaces such as
# charAt don't appear)
try:
d = dir(original)
for name in d:
if found.get(name) != 1:
ret[name] = getattr(original, name)
except:
# sometimes we're unable to do a dir
pass
return ret
def get_names(self, var):
used___dict__ = False
try:
names = dir(var)
except Exception:
names = []
if not names:
if hasattr_checked(var, '__dict__'):
names = list(var.__dict__)
used___dict__ = True
return names, used___dict__
def _get_py_dictionary(self, var, names=None, used___dict__=False):
'''
:return tuple(names, used___dict__), where used___dict__ means we have to access
using obj.__dict__[name] instead of getattr(obj, name)
'''
# On PyPy we never show functions. This is because of a corner case where PyPy becomes
# absurdly slow -- it takes almost half a second to introspect a single numpy function (so,
# the related test, "test_case_16_resolve_numpy_array", times out... this probably isn't
# specific to numpy, but to any library where the CPython bridge is used, but as we
# can't be sure in the debugger, we play it safe and don't show it at all).
filter_function = IS_PYPY
if not names:
names, used___dict__ = self.get_names(var)
d = {}
# Be aware that the order in which the filters are applied attempts to
# optimize the operation by removing as many items as possible in the
# first filters, leaving fewer items for later filters
timer = Timer()
cls = type(var)
for name in names:
try:
name_as_str = name
if name_as_str.__class__ != str:
name_as_str = '%r' % (name_as_str,)
if not used___dict__:
attr = getattr(var, name)
else:
attr = var.__dict__[name]
# filter functions?
if filter_function:
if inspect.isroutine(attr) or isinstance(attr, MethodWrapperType):
continue
except:
# if some error occurs getting it, let's put it to the user.
strIO = StringIO()
traceback.print_exc(file=strIO)
attr = strIO.getvalue()
finally:
timer.report_if_getting_attr_slow(cls, name_as_str)
d[name_as_str] = attr
return d, used___dict__
class DAPGrouperResolver:
def get_contents_debug_adapter_protocol(self, obj, fmt=None):
return obj.get_contents_debug_adapter_protocol()
_basic_immutable_types = (int, float, complex, str, bytes, type(None), bool, frozenset)
def _does_obj_repr_evaluate_to_obj(obj):
'''
If obj is an object where evaluating its representation leads to
the same object, return True, otherwise, return False.
'''
try:
if isinstance(obj, tuple):
for o in obj:
if not _does_obj_repr_evaluate_to_obj(o):
return False
return True
else:
return isinstance(obj, _basic_immutable_types)
except:
return False
#=======================================================================================================================
# DictResolver
#=======================================================================================================================
class DictResolver:
sort_keys = not IS_PY36_OR_GREATER
def resolve(self, dct, key):
if key in (GENERATED_LEN_ATTR_NAME, TOO_LARGE_ATTR):
return None
if '(' not in key:
# we have to treat that because the dict resolver is also used to directly resolve the global and local
# scopes (which already have the items directly)
try:
return dct[key]
except:
return getattr(dct, key)
# ok, we have to iterate over the items to find the one that matches the id, because that's the only way
# to actually find the reference from the string we have before.
expected_id = int(key.split('(')[-1][:-1])
for key, val in dct.items():
if id(key) == expected_id:
return val
raise UnableToResolveVariableException()
def key_to_str(self, key, fmt=None):
if fmt is not None:
if fmt.get('hex', False):
safe_repr = SafeRepr()
safe_repr.convert_to_hex = True
return safe_repr(key)
return '%r' % (key,)
def init_dict(self):
return {}
def get_contents_debug_adapter_protocol(self, dct, fmt=None):
'''
This method is to be used in the case where the variables are all saved by its id (and as
such don't need to have the `resolve` method called later on, so, keys don't need to
embed the reference in the key).
Note that the return should be ordered.
:return list(tuple(name:str, value:object, evaluateName:str))
'''
ret = []
i = 0
found_representations = set()
for key, val in dct.items():
i += 1
key_as_str = self.key_to_str(key, fmt)
if key_as_str not in found_representations:
found_representations.add(key_as_str)
else:
# If the key would be a duplicate, add the key id (otherwise
# VSCode won't show all keys correctly).
# See: https://github.com/microsoft/debugpy/issues/148
key_as_str = '%s (id: %s)' % (key_as_str, id(key))
found_representations.add(key_as_str)
if _does_obj_repr_evaluate_to_obj(key):
s = self.key_to_str(key) # do not format the key
eval_key_str = '[%s]' % (s,)
else:
eval_key_str = None
ret.append((key_as_str, val, eval_key_str))
if i >= pydevd_constants.PYDEVD_CONTAINER_RANDOM_ACCESS_MAX_ITEMS:
ret.append((TOO_LARGE_ATTR, TOO_LARGE_MSG % (pydevd_constants.PYDEVD_CONTAINER_RANDOM_ACCESS_MAX_ITEMS,), None))
break
# in case the class extends built-in type and has some additional fields
from_default_resolver = defaultResolver.get_contents_debug_adapter_protocol(dct, fmt)
if from_default_resolver:
ret = from_default_resolver + ret
if self.sort_keys:
ret = sorted(ret, key=lambda tup: sorted_attributes_key(tup[0]))
ret.append((GENERATED_LEN_ATTR_NAME, len(dct), partial(_apply_evaluate_name, evaluate_name='len(%s)')))
return ret
def get_dictionary(self, dct):
ret = self.init_dict()
i = 0
for key, val in dct.items():
i += 1
# we need to add the id because otherwise we cannot find the real object to get its contents later on.
key = '%s (%s)' % (self.key_to_str(key), id(key))
ret[key] = val
if i >= pydevd_constants.PYDEVD_CONTAINER_RANDOM_ACCESS_MAX_ITEMS:
ret[TOO_LARGE_ATTR] = TOO_LARGE_MSG % (pydevd_constants.PYDEVD_CONTAINER_RANDOM_ACCESS_MAX_ITEMS,)
break
# in case if the class extends built-in type and has some additional fields
additional_fields = defaultResolver.get_dictionary(dct)
ret.update(additional_fields)
ret[GENERATED_LEN_ATTR_NAME] = len(dct)
return ret
def _apply_evaluate_name(parent_name, evaluate_name):
return evaluate_name % (parent_name,)
class MoreItemsRange:
def __init__(self, value, from_i, to_i):
self.value = value
self.from_i = from_i
self.to_i = to_i
def get_contents_debug_adapter_protocol(self, _self, fmt=None):
l = len(self.value)
ret = []
format_str = '%0' + str(int(len(str(l - 1)))) + 'd'
if fmt is not None and fmt.get('hex', False):
format_str = '0x%0' + str(int(len(hex(l).lstrip('0x')))) + 'x'
for i, item in enumerate(self.value[self.from_i:self.to_i]):
i += self.from_i
ret.append((format_str % i, item, '[%s]' % i))
return ret
def get_dictionary(self, _self, fmt=None):
dct = {}
for key, obj, _ in self.get_contents_debug_adapter_protocol(self, fmt):
dct[key] = obj
return dct
def resolve(self, attribute):
'''
:param var: that's the original object we're dealing with.
:param attribute: that's the key to resolve
-- either the dict key in get_dictionary or the name in the dap protocol.
'''
return self.value[int(attribute)]
def __eq__(self, o):
return isinstance(o, MoreItemsRange) and self.value is o.value and \
self.from_i == o.from_i and self.to_i == o.to_i
def __str__(self):
return '[%s:%s]' % (self.from_i, self.to_i)
__repr__ = __str__
class MoreItems:
def __init__(self, value, handled_items):
self.value = value
self.handled_items = handled_items
def get_contents_debug_adapter_protocol(self, _self, fmt=None):
total_items = len(self.value)
remaining = total_items - self.handled_items
bucket_size = pydevd_constants.PYDEVD_CONTAINER_BUCKET_SIZE
from_i = self.handled_items
to_i = from_i + min(bucket_size, remaining)
ret = []
while remaining > 0:
remaining -= bucket_size
more_items_range = MoreItemsRange(self.value, from_i, to_i)
ret.append((str(more_items_range), more_items_range, None))
from_i = to_i
to_i = from_i + min(bucket_size, remaining)
return ret
def get_dictionary(self, _self, fmt=None):
dct = {}
for key, obj, _ in self.get_contents_debug_adapter_protocol(self, fmt):
dct[key] = obj
return dct
def resolve(self, attribute):
from_i, to_i = attribute[1:-1].split(':')
from_i = int(from_i)
to_i = int(to_i)
return MoreItemsRange(self.value, from_i, to_i)
def __eq__(self, o):
return isinstance(o, MoreItems) and self.value is o.value
def __str__(self):
return '...'
__repr__ = __str__
class ForwardInternalResolverToObject:
'''
To be used when we provide some internal object that'll actually do the resolution.
'''
def get_contents_debug_adapter_protocol(self, obj, fmt=None):
return obj.get_contents_debug_adapter_protocol(fmt)
def get_dictionary(self, var, fmt={}):
return var.get_dictionary(var, fmt)
def resolve(self, var, attribute):
return var.resolve(attribute)
class TupleResolver: # to enumerate tuples and lists
def resolve(self, var, attribute):
'''
:param var: that's the original object we're dealing with.
:param attribute: that's the key to resolve
-- either the dict key in get_dictionary or the name in the dap protocol.
'''
if attribute in (GENERATED_LEN_ATTR_NAME, TOO_LARGE_ATTR):
return None
try:
return var[int(attribute)]
except:
if attribute == 'more':
return MoreItems(var, pydevd_constants.PYDEVD_CONTAINER_INITIAL_EXPANDED_ITEMS)
return getattr(var, attribute)
def get_contents_debug_adapter_protocol(self, lst, fmt=None):
'''
This method is to be used in the case where the variables are all saved by its id (and as
such don't need to have the `resolve` method called later on, so, keys don't need to
embed the reference in the key).
Note that the return should be ordered.
:return list(tuple(name:str, value:object, evaluateName:str))
'''
lst_len = len(lst)
ret = []
format_str = '%0' + str(int(len(str(lst_len - 1)))) + 'd'
if fmt is not None and fmt.get('hex', False):
format_str = '0x%0' + str(int(len(hex(lst_len).lstrip('0x')))) + 'x'
initial_expanded = pydevd_constants.PYDEVD_CONTAINER_INITIAL_EXPANDED_ITEMS
for i, item in enumerate(lst):
ret.append((format_str % i, item, '[%s]' % i))
if i >= initial_expanded - 1:
if (lst_len - initial_expanded) < pydevd_constants.PYDEVD_CONTAINER_BUCKET_SIZE:
# Special case: if we have just 1 more bucket just put it inline.
item = MoreItemsRange(lst, initial_expanded, lst_len)
else:
# Multiple buckets
item = MoreItems(lst, initial_expanded)
ret.append(('more', item, None))
break
# Needed in case the class extends the built-in type and has some additional fields.
from_default_resolver = defaultResolver.get_contents_debug_adapter_protocol(lst, fmt=fmt)
if from_default_resolver:
ret = from_default_resolver + ret
ret.append((GENERATED_LEN_ATTR_NAME, len(lst), partial(_apply_evaluate_name, evaluate_name='len(%s)')))
return ret
def get_dictionary(self, var, fmt={}):
l = len(var)
d = {}
format_str = '%0' + str(int(len(str(l - 1)))) + 'd'
if fmt is not None and fmt.get('hex', False):
format_str = '0x%0' + str(int(len(hex(l).lstrip('0x')))) + 'x'
initial_expanded = pydevd_constants.PYDEVD_CONTAINER_INITIAL_EXPANDED_ITEMS
for i, item in enumerate(var):
d[format_str % i] = item
if i >= initial_expanded - 1:
item = MoreItems(var, initial_expanded)
d['more'] = item
break
# in case if the class extends built-in type and has some additional fields
additional_fields = defaultResolver.get_dictionary(var)
d.update(additional_fields)
d[GENERATED_LEN_ATTR_NAME] = len(var)
return d
#=======================================================================================================================
# SetResolver
#=======================================================================================================================
class SetResolver:
'''
Resolves a set as dict id(object)->object
'''
def get_contents_debug_adapter_protocol(self, obj, fmt=None):
ret = []
for i, item in enumerate(obj):
ret.append((str(id(item)), item, None))
if i >= pydevd_constants.PYDEVD_CONTAINER_RANDOM_ACCESS_MAX_ITEMS:
ret.append((TOO_LARGE_ATTR, TOO_LARGE_MSG % (pydevd_constants.PYDEVD_CONTAINER_RANDOM_ACCESS_MAX_ITEMS,), None))
break
# Needed in case the class extends the built-in type and has some additional fields.
from_default_resolver = defaultResolver.get_contents_debug_adapter_protocol(obj, fmt=fmt)
if from_default_resolver:
ret = from_default_resolver + ret
ret.append((GENERATED_LEN_ATTR_NAME, len(obj), partial(_apply_evaluate_name, evaluate_name='len(%s)')))
return ret
def resolve(self, var, attribute):
if attribute in (GENERATED_LEN_ATTR_NAME, TOO_LARGE_ATTR):
return None
try:
attribute = int(attribute)
except:
return getattr(var, attribute)
for v in var:
if id(v) == attribute:
return v
raise UnableToResolveVariableException('Unable to resolve %s in %s' % (attribute, var))
def get_dictionary(self, var):
d = {}
for i, item in enumerate(var):
d[str(id(item))] = item
if i >= pydevd_constants.PYDEVD_CONTAINER_RANDOM_ACCESS_MAX_ITEMS:
d[TOO_LARGE_ATTR] = TOO_LARGE_MSG % (pydevd_constants.PYDEVD_CONTAINER_RANDOM_ACCESS_MAX_ITEMS,)
break
# in case if the class extends built-in type and has some additional fields
additional_fields = defaultResolver.get_dictionary(var)
d.update(additional_fields)
d[GENERATED_LEN_ATTR_NAME] = len(var)
return d
def change_var_from_name(self, container, name, new_value):
# The name given in this case must be the id(item), so, we can actually
# iterate in the set and see which item matches the given id.
try:
# Check that the new value can actually be added to a set (i.e.: it's hashable/comparable).
set().add(new_value)
except:
return None
for item in container:
if str(id(item)) == name:
container.remove(item)
container.add(new_value)
return str(id(new_value))
return None
#=======================================================================================================================
# InstanceResolver
#=======================================================================================================================
class InstanceResolver:
def resolve(self, var, attribute):
field = var.__class__.getDeclaredField(attribute)
field.setAccessible(True)
return field.get(var)
def get_dictionary(self, obj):
ret = {}
declaredFields = obj.__class__.getDeclaredFields()
for i in range(len(declaredFields)):
name = declaredFields[i].getName()
try:
declaredFields[i].setAccessible(True)
ret[name] = declaredFields[i].get(obj)
except:
pydev_log.exception()
return ret
#=======================================================================================================================
# JyArrayResolver
#=======================================================================================================================
class JyArrayResolver:
'''
This resolves a regular Object[] array from java
'''
def resolve(self, var, attribute):
if attribute == GENERATED_LEN_ATTR_NAME:
return None
return var[int(attribute)]
def get_dictionary(self, obj):
ret = {}
for i in range(len(obj)):
ret[ i ] = obj[i]
ret[GENERATED_LEN_ATTR_NAME] = len(obj)
return ret
#=======================================================================================================================
# MultiValueDictResolver
#=======================================================================================================================
class MultiValueDictResolver(DictResolver):
def resolve(self, dct, key):
if key in (GENERATED_LEN_ATTR_NAME, TOO_LARGE_ATTR):
return None
# ok, we have to iterate over the items to find the one that matches the id, because that's the only way
# to actually find the reference from the string we have before.
expected_id = int(key.split('(')[-1][:-1])
for key in list(dct.keys()):
val = dct.getlist(key)
if id(key) == expected_id:
return val
raise UnableToResolveVariableException()
#=======================================================================================================================
# DjangoFormResolver
#=======================================================================================================================
class DjangoFormResolver(DefaultResolver):
def get_dictionary(self, var, names=None):
# Do not call self.errors because it is a property and has side effects.
names, used___dict__ = self.get_names(var)
has_errors_attr = False
if "errors" in names:
has_errors_attr = True
names.remove("errors")
d = defaultResolver.get_dictionary(var, names=names, used___dict__=used___dict__)
if has_errors_attr:
try:
errors_attr = getattr(var, "_errors")
except:
errors_attr = None
d["errors"] = errors_attr
return d
#=======================================================================================================================
# DequeResolver
#=======================================================================================================================
class DequeResolver(TupleResolver):
def get_dictionary(self, var):
d = TupleResolver.get_dictionary(self, var)
d['maxlen'] = getattr(var, 'maxlen', None)
return d
#=======================================================================================================================
# OrderedDictResolver
#=======================================================================================================================
class OrderedDictResolver(DictResolver):
sort_keys = False
def init_dict(self):
return OrderedDict()
#=======================================================================================================================
# FrameResolver
#=======================================================================================================================
class FrameResolver:
'''
This resolves a frame.
'''
def resolve(self, obj, attribute):
if attribute == '__internals__':
return defaultResolver.get_dictionary(obj)
if attribute == 'stack':
return self.get_frame_stack(obj)
if attribute == 'f_locals':
return obj.f_locals
return None
def get_dictionary(self, obj):
ret = {}
ret['__internals__'] = defaultResolver.get_dictionary(obj)
ret['stack'] = self.get_frame_stack(obj)
ret['f_locals'] = obj.f_locals
return ret
def get_frame_stack(self, frame):
ret = []
if frame is not None:
ret.append(self.get_frame_name(frame))
while frame.f_back:
frame = frame.f_back
ret.append(self.get_frame_name(frame))
return ret
def get_frame_name(self, frame):
if frame is None:
return 'None'
try:
name = basename(frame.f_code.co_filename)
return 'frame: %s [%s:%s] id:%s' % (frame.f_code.co_name, name, frame.f_lineno, id(frame))
except:
return 'frame object'
defaultResolver = DefaultResolver()
dictResolver = DictResolver()
tupleResolver = TupleResolver()
instanceResolver = InstanceResolver()
jyArrayResolver = JyArrayResolver()
setResolver = SetResolver()
multiValueDictResolver = MultiValueDictResolver()
djangoFormResolver = DjangoFormResolver()
dequeResolver = DequeResolver()
orderedDictResolver = OrderedDictResolver()
frameResolver = FrameResolver()
dapGrouperResolver = DAPGrouperResolver()
forwardInternalResolverToObject = ForwardInternalResolverToObject()
class InspectStub:
def isbuiltin(self, _args):
return False
def isroutine(self, object):
return False
try:
import inspect
except:
inspect = InspectStub()
def get_var_scope(attr_name, attr_value, evaluate_name, handle_return_values):
if attr_name.startswith("'"):
if attr_name.endswith("'"):
# i.e.: strings denote that it is a regular value in some container.
return ''
else:
i = attr_name.find("__' (")
if i >= 0:
# Handle attr_name such as: >>'__name__' (1732494379184)<<
attr_name = attr_name[1: i + 2]
if handle_return_values and attr_name == RETURN_VALUES_DICT:
return ''
elif attr_name == GENERATED_LEN_ATTR_NAME:
return ''
if attr_name.startswith('__') and attr_name.endswith('__'):
return DAPGrouper.SCOPE_SPECIAL_VARS
if attr_name.startswith('_') or attr_name.endswith('__'):
return DAPGrouper.SCOPE_PROTECTED_VARS
try:
if inspect.isroutine(attr_value) or isinstance(attr_value, MethodWrapperType):
return DAPGrouper.SCOPE_FUNCTION_VARS
elif inspect.isclass(attr_value):
return DAPGrouper.SCOPE_CLASS_VARS
except:
# It's possible that isinstance throws an exception when dealing with user-code.
if DebugInfoHolder.DEBUG_TRACE_LEVEL > 0:
pydev_log.exception()
return ''