|
|
|
"""
|
|
|
|
This module implements handling of non-primitive objects as values in Grist data cells. It is
|
|
|
|
currently only used to handle errors thrown from formulas.
|
|
|
|
|
|
|
|
Non-primitive values are represented in actions as [type_name, args...].
|
|
|
|
objtypes.register_converter() - registers a new supported object type.
|
|
|
|
objtypes.encode_object(obj) - returns a marshallable list representation.
|
|
|
|
objtypes.decode_object(val) - returns an object represented by the [name, args...] argument.
|
|
|
|
|
|
|
|
If an object cannot be encoded or decoded, an "UnmarshallableValue" is returned instead
|
|
|
|
of the form ['U', repr(obj)].
|
|
|
|
"""
|
|
|
|
# pylint: disable=too-many-return-statements
|
|
|
|
import traceback
|
|
|
|
from datetime import date, datetime
|
|
|
|
from math import isnan
|
|
|
|
|
|
|
|
import moment
|
|
|
|
import records
|
|
|
|
import six
|
|
|
|
|
|
|
|
|
|
|
|
class UnmarshallableError(ValueError):
|
|
|
|
"""
|
|
|
|
Error raised when an object cannot be represented in an action by Grist. It happens if the
|
|
|
|
object is of a type for which there is no registered converter, or if encoding it involves
|
|
|
|
values that cannot be marshalled.
|
|
|
|
"""
|
|
|
|
pass
|
|
|
|
|
|
|
|
|
|
|
|
class ConversionError(ValueError):
|
|
|
|
"""
|
|
|
|
Indicates a failure to convert a value between Grist types. We don't usually expose it to the
|
|
|
|
user, since such a failure normally results in silent alttext.
|
|
|
|
"""
|
|
|
|
pass
|
|
|
|
|
|
|
|
|
|
|
|
class InvalidTypedValue(ValueError):
|
|
|
|
"""
|
|
|
|
Indicates that AltText was in place of a typed value and produced an error. The value of AltText
|
|
|
|
is included into the exception, both to be more informative, and to sort displayCols properly.
|
|
|
|
"""
|
|
|
|
def __init__(self, typename, value):
|
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|
|
super(InvalidTypedValue, self).__init__(typename)
|
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|
|
self.typename = typename
|
|
|
|
self.value = value
|
|
|
|
|
|
|
|
def __str__(self):
|
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|
|
return "Invalid %s: %s" % (self.typename, self.value)
|
|
|
|
|
|
|
|
|
|
|
|
class AltText(object):
|
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|
|
"""
|
|
|
|
Represents a text value in a non-text column. The separate class allows formulas to access
|
|
|
|
wrong-type values. We use a wrapper rather than expose text directly to formulas, because with
|
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|
|
text there is a risk that e.g. a formula that's supposed to add numbers would add two strings
|
|
|
|
with unexpected result.
|
|
|
|
"""
|
|
|
|
def __init__(self, text, typename=None):
|
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|
|
self._text = text
|
|
|
|
self._typename = typename
|
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|
|
|
|
|
|
def __str__(self):
|
|
|
|
return self._text
|
|
|
|
|
|
|
|
def __int__(self):
|
|
|
|
# This ensures that AltText values that look like ints may be cast back to int.
|
|
|
|
# Convert to float first, since python does not allow casting strings with decimals to int.
|
|
|
|
return int(float(self._text))
|
|
|
|
|
|
|
|
def __float__(self):
|
|
|
|
# This ensures that AltText values that look like floats may be cast back to float.
|
|
|
|
return float(self._text)
|
|
|
|
|
|
|
|
def __repr__(self):
|
|
|
|
return '%s(%r)' % (self.__class__.__name__, self._text)
|
|
|
|
|
|
|
|
# Allow comparing to AltText("something")
|
|
|
|
def __eq__(self, other):
|
|
|
|
return isinstance(other, self.__class__) and self._text == other._text
|
|
|
|
|
|
|
|
def __ne__(self, other):
|
|
|
|
return not self.__eq__(other)
|
|
|
|
|
|
|
|
def __hash__(self):
|
|
|
|
return hash((self.__class__, self._text))
|
|
|
|
|
|
|
|
def __getattr__(self, name):
|
|
|
|
# On attempt to do $foo.Bar on an AltText value such as "hello", raise an exception that will
|
|
|
|
# show up as e.g. "Invalid Ref: hello" or "Invalid Date: hello".
|
|
|
|
raise InvalidTypedValue(self._typename, self._text)
|
|
|
|
|
|
|
|
|
|
|
|
class UnmarshallableValue(object):
|
|
|
|
"""
|
|
|
|
Represents an UnmarshallableValue. There is nothing we can do with it except encode it back.
|
|
|
|
"""
|
|
|
|
def __init__(self, value_repr):
|
|
|
|
self.value_repr = value_repr
|
|
|
|
|
|
|
|
|
|
|
|
# Unique sentinel value representing a pending value. It's encoded as ['P'], and shown to the user
|
|
|
|
# as "Loading..." text. With the switch to stored formulas, it's currently only used when a
|
|
|
|
# document was just migrated.
|
|
|
|
_pending_sentinel = object()
|
|
|
|
|
|
|
|
# A placeholder for a value hidden by access control rules.
|
|
|
|
# Depending on the types of the columns involved, copying
|
|
|
|
# a censored value and pasting elsewhere will either use
|
|
|
|
# CensoredValue.__repr__ (python) or CensoredValue.toString (typescript)
|
|
|
|
# so they should match
|
|
|
|
class CensoredValue(object):
|
|
|
|
def __repr__(self):
|
|
|
|
return 'CENSORED'
|
|
|
|
|
|
|
|
_censored_sentinel = CensoredValue()
|
|
|
|
|
|
|
|
|
|
|
|
_max_js_int = 1<<31
|
|
|
|
|
|
|
|
def is_int_short(value):
|
|
|
|
return -_max_js_int <= value < _max_js_int
|
|
|
|
|
|
|
|
def safe_repr(obj):
|
|
|
|
"""
|
|
|
|
Like repr(obj) but falls back to a simpler "<type-name>" string when repr() itself fails.
|
|
|
|
"""
|
|
|
|
try:
|
|
|
|
return repr(obj)
|
|
|
|
except Exception:
|
|
|
|
return '<' + type(obj).__name__ + '>'
|
|
|
|
|
|
|
|
def strict_equal(a, b):
|
|
|
|
"""Checks the equality of the types of the values as well as the values, and handle errors."""
|
|
|
|
# pylint: disable=unidiomatic-typecheck
|
|
|
|
# Try/catch needed because some comparisons may fail (e.g. datetimes with different tzinfo)
|
|
|
|
try:
|
|
|
|
return type(a) == type(b) and a == b
|
|
|
|
except Exception:
|
|
|
|
return False
|
|
|
|
|
|
|
|
def equal_encoding(a, b):
|
|
|
|
# Compare NaNs as equal.
|
|
|
|
if isinstance(a, float) and isinstance(b, float):
|
|
|
|
return a == b or (isnan(a) and isnan(b))
|
|
|
|
|
|
|
|
# Compare bools as equal only to bools (these are distinguishable from numbers in JSON, and we
|
|
|
|
# take care to distinguish them in DB too).
|
|
|
|
if isinstance(a, bool) or isinstance(b, bool):
|
|
|
|
# pylint: disable=unidiomatic-typecheck
|
|
|
|
return type(a) == type(b) and a == b
|
|
|
|
|
|
|
|
# Note for simple types, encode_object is trivial, and will result in a non-type-specific
|
|
|
|
# comparison (e.g. 1 and 1.0 will compare equal, as would "a" and u"a"). This is to capture
|
|
|
|
# equivalence of values in their JSON representations.
|
|
|
|
return encode_object(a) == encode_object(b)
|
|
|
|
|
|
|
|
def encode_object(value):
|
|
|
|
"""
|
|
|
|
Produces a Grist-encoded version of the value, e.g. turning a Date into ['d', timestamp].
|
|
|
|
Returns ['U', repr(value)] if it fails to encode otherwise.
|
|
|
|
"""
|
|
|
|
try:
|
|
|
|
if isinstance(value, (six.text_type, float, bool)) or value is None:
|
|
|
|
return value
|
|
|
|
elif isinstance(value, six.binary_type):
|
|
|
|
return value.decode('utf8')
|
|
|
|
elif isinstance(value, six.integer_types):
|
|
|
|
if not is_int_short(value):
|
|
|
|
raise UnmarshallableError("Integer too large")
|
|
|
|
return value
|
|
|
|
elif isinstance(value, AltText):
|
|
|
|
return six.text_type(value)
|
|
|
|
elif isinstance(value, records.Record):
|
|
|
|
return ['R', value._table.table_id, value._row_id]
|
|
|
|
elif isinstance(value, RecordStub):
|
|
|
|
return ['R', value.table_id, value.row_id]
|
|
|
|
elif isinstance(value, datetime):
|
|
|
|
return ['D', moment.dt_to_ts(value), value.tzinfo.zone.name if value.tzinfo else 'UTC']
|
|
|
|
elif isinstance(value, date):
|
|
|
|
return ['d', moment.date_to_ts(value)]
|
|
|
|
elif isinstance(value, RaisedException):
|
|
|
|
return ['E'] + value.encode_args()
|
|
|
|
elif isinstance(value, (list, tuple)):
|
|
|
|
return ['L'] + [encode_object(item) for item in value]
|
|
|
|
elif isinstance(value, records.RecordSet):
|
|
|
|
return ['r', value._table.table_id, value._row_ids]
|
|
|
|
elif isinstance(value, RecordSetStub):
|
|
|
|
return ['r', value.table_id, value.row_ids]
|
|
|
|
elif isinstance(value, dict):
|
|
|
|
if not all(isinstance(key, six.string_types) for key in value):
|
|
|
|
raise UnmarshallableError("Dict with non-string keys")
|
|
|
|
return ['O', {key: encode_object(val) for key, val in six.iteritems(value)}]
|
|
|
|
elif value == _pending_sentinel:
|
|
|
|
return ['P']
|
|
|
|
elif value == _censored_sentinel:
|
|
|
|
return ['C']
|
|
|
|
elif isinstance(value, UnmarshallableValue):
|
|
|
|
return ['U', value.value_repr]
|
|
|
|
except Exception as e:
|
|
|
|
pass
|
|
|
|
# We either don't know how to convert the value, or failed during the conversion. Instead we
|
|
|
|
# return an "UnmarshallableValue" object, with repr() of the value to show to the user.
|
|
|
|
return ['U', safe_repr(value)]
|
|
|
|
|
|
|
|
def decode_object(value):
|
|
|
|
"""
|
|
|
|
Given a Grist-encoded value, returns an object represented by it.
|
|
|
|
If typename is unknown, or construction fails for any reason, returns (not raises!)
|
|
|
|
RaisedException with the original exception in its .error property.
|
|
|
|
"""
|
|
|
|
try:
|
|
|
|
if not isinstance(value, (list, tuple)):
|
|
|
|
return value
|
|
|
|
code = value[0]
|
|
|
|
args = value[1:]
|
|
|
|
if code == 'R':
|
|
|
|
return RecordStub(args[0], args[1])
|
|
|
|
elif code == 'r':
|
|
|
|
return RecordSetStub(args[0], args[1])
|
|
|
|
elif code == 'D':
|
|
|
|
return moment.ts_to_dt(args[0], moment.Zone(args[1]))
|
|
|
|
elif code == 'd':
|
|
|
|
return moment.ts_to_date(args[0])
|
|
|
|
elif code == 'E':
|
|
|
|
return RaisedException.decode_args(*args)
|
|
|
|
elif code == 'L':
|
|
|
|
return [decode_object(item) for item in args]
|
|
|
|
elif code == 'O':
|
|
|
|
return {decode_object(key): decode_object(val) for key, val in six.iteritems(args[0])}
|
|
|
|
elif code == 'P':
|
|
|
|
return _pending_sentinel
|
|
|
|
elif code == 'C':
|
|
|
|
return _censored_sentinel
|
|
|
|
elif code == 'U':
|
|
|
|
return UnmarshallableValue(args[0])
|
|
|
|
raise KeyError("Unknown object type code %r" % code)
|
|
|
|
except Exception as e:
|
|
|
|
return RaisedException(e)
|
|
|
|
|
|
|
|
#----------------------------------------------------------------------
|
|
|
|
|
|
|
|
class RaisedException(object):
|
|
|
|
"""
|
|
|
|
RaisedException is a special type of object which indicates that a value in a cell isn't a plain
|
|
|
|
value but an exception to be raised. All caught exceptions are wrapped in RaisedException. The
|
|
|
|
original exception is saved in the .error attribute. The traceback is saved in .details
|
|
|
|
attribute only when needed (flag include_details is set).
|
|
|
|
|
|
|
|
RaisedException is registered under a special short name ("E") to save bytes since it's such a
|
|
|
|
widely-used wrapper. To encode_args, it simply returns the entire encoded stored error, e.g.
|
|
|
|
RaisedException(ValueError("foo")) is encoded as ["E", "ValueError", "foo"].
|
|
|
|
"""
|
|
|
|
def __init__(self, error, include_details=False, encoded_error=None):
|
|
|
|
self.error = error
|
|
|
|
self.details = traceback.format_exc() if include_details else None
|
|
|
|
self._encoded_error = encoded_error or self._encode_error()
|
|
|
|
|
|
|
|
def encode_args(self):
|
|
|
|
return self._encoded_error
|
|
|
|
|
|
|
|
def _encode_error(self):
|
|
|
|
# TODO: We should probably return all args, to communicate the error details to the browser
|
|
|
|
# and to DB (for when we store formula results). There are two concerns: one is that it's
|
|
|
|
# potentially quite verbose; the other is that it's makes the tests more annoying (again b/c
|
|
|
|
# verbose).
|
|
|
|
error = self.error
|
|
|
|
location = ""
|
|
|
|
while isinstance(error, CellError):
|
|
|
|
if not location:
|
|
|
|
location = "\n(in referenced cell {error.location})".format(error=error)
|
|
|
|
error = error.error
|
|
|
|
name = type(error).__name__
|
|
|
|
if self.details:
|
|
|
|
return [name, str(error) + location, self.details]
|
|
|
|
if isinstance(error, InvalidTypedValue):
|
|
|
|
return [name, error.typename, error.value]
|
|
|
|
return [name]
|
|
|
|
|
|
|
|
@classmethod
|
|
|
|
def decode_args(cls, *args):
|
|
|
|
# Decoding of a RaisedException is only enough to re-encode it.
|
|
|
|
return cls(None, encoded_error=list(args))
|
|
|
|
|
|
|
|
|
|
|
|
class CellError(Exception):
|
|
|
|
def __init__(self, table_id, col_id, row_id, error):
|
|
|
|
super(CellError, self).__init__(table_id, col_id, row_id, error)
|
|
|
|
self.table_id = table_id
|
|
|
|
self.col_id = col_id
|
|
|
|
self.row_id = row_id
|
|
|
|
self.error = error
|
|
|
|
|
|
|
|
def __str__(self):
|
|
|
|
return (
|
|
|
|
"{self.error.__class__.__name__} in referenced cell {self.location}"
|
|
|
|
).format(self=self)
|
|
|
|
|
|
|
|
@property
|
|
|
|
def location(self):
|
|
|
|
return "{self.table_id}[{self.row_id}].{self.col_id}".format(self=self)
|
|
|
|
|
|
|
|
|
|
|
|
class RecordList(list):
|
|
|
|
"""
|
|
|
|
Just like list but allows setting custom attributes, which we use for remembering _group_by and
|
|
|
|
_sort_by attributes when storing RecordSet as usertypes.ReferenceList type.
|
|
|
|
"""
|
|
|
|
def __init__(self, row_ids, group_by=None, sort_by=None):
|
|
|
|
list.__init__(self, row_ids)
|
|
|
|
self._group_by = group_by
|
|
|
|
self._sort_by = sort_by
|
|
|
|
|
|
|
|
def __repr__(self):
|
|
|
|
return "RecordList(%s, group_by=%r, sort_by=%r)" % (
|
|
|
|
list.__repr__(self), self._group_by, self._sort_by)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
# We don't currently have a good way to convert an incoming marshalled record to a proper Record
|
|
|
|
# object for an appropriate table. We don't expect incoming marshalled records at all, but if such
|
|
|
|
# a thing happens, we'll construct this RecordStub.
|
|
|
|
class RecordStub(object):
|
|
|
|
def __init__(self, table_id, row_id):
|
|
|
|
self.table_id = table_id
|
|
|
|
self.row_id = row_id
|
|
|
|
|
|
|
|
|
|
|
|
class RecordSetStub(object):
|
|
|
|
def __init__(self, table_id, row_ids):
|
|
|
|
self.table_id = table_id
|
|
|
|
self.row_ids = row_ids
|