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import pprint
import avro.schema
from avro.schema import Schema
import sys
import urlparse
import re
from typing import Any, Union
from .sourceline import SourceLine, lineno_re, bullets, indent
class ValidationException(Exception):
pass
class ClassValidationException(ValidationException):
pass
def validate(expected_schema, # type: Schema
datum, # type: Any
identifiers=set(), # type: Set[unicode]
strict=False, # type: bool
foreign_properties=set() # type: Set[unicode]
):
# type: (...) -> bool
return validate_ex(
expected_schema, datum, identifiers, strict=strict,
foreign_properties=foreign_properties, raise_ex=False)
INT_MIN_VALUE = -(1 << 31)
INT_MAX_VALUE = (1 << 31) - 1
LONG_MIN_VALUE = -(1 << 63)
LONG_MAX_VALUE = (1 << 63) - 1
def friendly(v): # type: (Any) -> Any
if isinstance(v, avro.schema.NamedSchema):
return v.name
if isinstance(v, avro.schema.ArraySchema):
return "array of <%s>" % friendly(v.items)
elif isinstance(v, avro.schema.PrimitiveSchema):
return v.type
elif isinstance(v, avro.schema.UnionSchema):
return " or ".join([friendly(s) for s in v.schemas])
else:
return v
def vpformat(datum): # type: (Any) -> str
a = pprint.pformat(datum)
if len(a) > 160:
a = a[0:160] + "[...]"
return a
def validate_ex(expected_schema, # type: Schema
datum, # type: Any
identifiers=None, # type: Set[unicode]
strict=False, # type: bool
foreign_properties=None, # type: Set[unicode]
raise_ex=True # type: bool
):
# type: (...) -> bool
"""Determine if a python datum is an instance of a schema."""
if not identifiers:
identifiers = set()
if not foreign_properties:
foreign_properties = set()
schema_type = expected_schema.type
if schema_type == 'null':
if datum is None:
return True
else:
if raise_ex:
raise ValidationException(u"the value is not null")
else:
return False
elif schema_type == 'boolean':
if isinstance(datum, bool):
return True
else:
if raise_ex:
raise ValidationException(u"the value is not boolean")
else:
return False
elif schema_type == 'string':
if isinstance(datum, basestring):
return True
elif isinstance(datum, bytes):
datum = datum.decode(u"utf-8")
return True
else:
if raise_ex:
raise ValidationException(u"the value is not string")
else:
return False
elif schema_type == 'bytes':
if isinstance(datum, str):
return True
else:
if raise_ex:
raise ValidationException(
u"the value `%s` is not bytes" % vpformat(datum))
else:
return False
elif schema_type == 'int':
if ((isinstance(datum, int) or isinstance(datum, long))
and INT_MIN_VALUE <= datum <= INT_MAX_VALUE):
return True
else:
if raise_ex:
raise ValidationException(u"`%s` is not int" % vpformat(datum))
else:
return False
elif schema_type == 'long':
if ((isinstance(datum, int) or isinstance(datum, long))
and LONG_MIN_VALUE <= datum <= LONG_MAX_VALUE):
return True
else:
if raise_ex:
raise ValidationException(
u"the value `%s` is not long" % vpformat(datum))
else:
return False
elif schema_type in ['float', 'double']:
if (isinstance(datum, int) or isinstance(datum, long)
or isinstance(datum, float)):
return True
else:
if raise_ex:
raise ValidationException(
u"the value `%s` is not float or double" % vpformat(datum))
else:
return False
elif isinstance(expected_schema, avro.schema.EnumSchema):
if expected_schema.name == "Any":
if datum is not None:
return True
else:
if raise_ex:
raise ValidationException(u"'Any' type must be non-null")
else:
return False
if not isinstance(datum, basestring):
if raise_ex:
raise ValidationException(
u"value is a %s but expected a string" % (type(datum).__name__))
else:
return False
if datum in expected_schema.symbols:
return True
else:
if raise_ex:
raise ValidationException(u"the value %s is not a valid %s, expected %s%s" % (vpformat(datum), expected_schema.name,
"one of " if len(
expected_schema.symbols) > 1 else "",
"'" + "', '".join(expected_schema.symbols) + "'"))
else:
return False
elif isinstance(expected_schema, avro.schema.ArraySchema):
if isinstance(datum, list):
for i, d in enumerate(datum):
try:
sl = SourceLine(datum, i, ValidationException)
if not validate_ex(expected_schema.items, d, identifiers, strict=strict,
foreign_properties=foreign_properties,
raise_ex=raise_ex):
return False
except ValidationException as v:
if raise_ex:
raise sl.makeError(
unicode("item is invalid because\n%s" % (indent(str(v)))))
else:
return False
return True
else:
if raise_ex:
raise ValidationException(u"the value is not a list, expected list of %s" % (
friendly(expected_schema.items)))
else:
return False
elif isinstance(expected_schema, avro.schema.UnionSchema):
for s in expected_schema.schemas:
if validate_ex(s, datum, identifiers, strict=strict, raise_ex=False):
return True
if not raise_ex:
return False
errors = [] # type: List[unicode]
checked = []
for s in expected_schema.schemas:
if isinstance(datum, list) and not isinstance(s, avro.schema.ArraySchema):
continue
elif isinstance(datum, dict) and not isinstance(s, avro.schema.RecordSchema):
continue
elif isinstance(datum, (bool, int, long, float, basestring)) and isinstance(s, (avro.schema.ArraySchema, avro.schema.RecordSchema)):
continue
elif datum is not None and s.type == "null":
continue
checked.append(s)
try:
validate_ex(s, datum, identifiers, strict=strict,
foreign_properties=foreign_properties, raise_ex=True)
except ClassValidationException as e:
raise
except ValidationException as e:
errors.append(unicode(e))
if errors:
raise ValidationException(bullets(["tried %s but\n%s" % (friendly(
checked[i]), indent(errors[i])) for i in range(0, len(errors))], "- "))
else:
raise ValidationException("value is a %s, expected %s" % (
type(datum).__name__, friendly(expected_schema)))
elif isinstance(expected_schema, avro.schema.RecordSchema):
if not isinstance(datum, dict):
if raise_ex:
raise ValidationException(u"is not a dict")
else:
return False
classmatch = None
for f in expected_schema.fields:
if f.name in ("class",):
d = datum.get(f.name)
if not d:
if raise_ex:
raise ValidationException(
u"Missing '%s' field" % (f.name))
else:
return False
if expected_schema.name != d:
return False
classmatch = d
break
errors = []
for f in expected_schema.fields:
if f.name in ("class",):
continue
if f.name in datum:
fieldval = datum[f.name]
else:
try:
fieldval = f.default
except KeyError:
fieldval = None
try:
sl = SourceLine(datum, f.name, unicode)
if not validate_ex(f.type, fieldval, identifiers, strict=strict, foreign_properties=foreign_properties,
raise_ex=raise_ex):
return False
except ValidationException as v:
if f.name not in datum:
errors.append(u"missing required field `%s`" % f.name)
else:
errors.append(sl.makeError(u"the `%s` field is not valid because\n%s" % (
f.name, indent(str(v)))))
if strict:
for d in datum:
found = False
for f in expected_schema.fields:
if d == f.name:
found = True
if not found:
sl = SourceLine(datum, d, unicode)
if d not in identifiers and d not in foreign_properties and d[0] not in ("@", "$"):
if not raise_ex:
return False
split = urlparse.urlsplit(d)
if split.scheme:
errors.append(sl.makeError(
u"unrecognized extension field `%s` and strict is True. Did you include a $schemas section?" % (d)))
else:
errors.append(sl.makeError(u"invalid field `%s`, expected one of: %s" % (
d, ", ".join("'%s'" % fn.name for fn in expected_schema.fields))))
if errors:
if raise_ex:
if classmatch:
raise ClassValidationException(bullets(errors, "* "))
else:
raise ValidationException(bullets(errors, "* "))
else:
return False
else:
return True
if raise_ex:
raise ValidationException(u"Unrecognized schema_type %s" % schema_type)
else:
return False
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