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plugin.audio.librespot/resources/lib/deps/protobuf/descriptor.py

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2024-02-21 05:35:31 +00:00
# Protocol Buffers - Google's data interchange format
# Copyright 2008 Google Inc. All rights reserved.
# https://developers.google.com/protocol-buffers/
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Descriptors essentially contain exactly the information found in a .proto
file, in types that make this information accessible in Python.
"""
__author__ = 'robinson@google.com (Will Robinson)'
import threading
import warnings
from google.protobuf.internal import api_implementation
_USE_C_DESCRIPTORS = False
if api_implementation.Type() == 'cpp':
# Used by MakeDescriptor in cpp mode
import binascii
import os
from google.protobuf.pyext import _message
_USE_C_DESCRIPTORS = True
class Error(Exception):
"""Base error for this module."""
class TypeTransformationError(Error):
"""Error transforming between python proto type and corresponding C++ type."""
if _USE_C_DESCRIPTORS:
# This metaclass allows to override the behavior of code like
# isinstance(my_descriptor, FieldDescriptor)
# and make it return True when the descriptor is an instance of the extension
# type written in C++.
class DescriptorMetaclass(type):
def __instancecheck__(cls, obj):
if super(DescriptorMetaclass, cls).__instancecheck__(obj):
return True
if isinstance(obj, cls._C_DESCRIPTOR_CLASS):
return True
return False
else:
# The standard metaclass; nothing changes.
DescriptorMetaclass = type
class _Lock(object):
"""Wrapper class of threading.Lock(), which is allowed by 'with'."""
def __new__(cls):
self = object.__new__(cls)
self._lock = threading.Lock() # pylint: disable=protected-access
return self
def __enter__(self):
self._lock.acquire()
def __exit__(self, exc_type, exc_value, exc_tb):
self._lock.release()
_lock = threading.Lock()
def _Deprecated(name):
if _Deprecated.count > 0:
_Deprecated.count -= 1
warnings.warn(
'Call to deprecated create function %s(). Note: Create unlinked '
'descriptors is going to go away. Please use get/find descriptors from '
'generated code or query the descriptor_pool.'
% name,
category=DeprecationWarning, stacklevel=3)
# Deprecated warnings will print 100 times at most which should be enough for
# users to notice and do not cause timeout.
_Deprecated.count = 100
_internal_create_key = object()
class DescriptorBase(metaclass=DescriptorMetaclass):
"""Descriptors base class.
This class is the base of all descriptor classes. It provides common options
related functionality.
Attributes:
has_options: True if the descriptor has non-default options. Usually it
is not necessary to read this -- just call GetOptions() which will
happily return the default instance. However, it's sometimes useful
for efficiency, and also useful inside the protobuf implementation to
avoid some bootstrapping issues.
"""
if _USE_C_DESCRIPTORS:
# The class, or tuple of classes, that are considered as "virtual
# subclasses" of this descriptor class.
_C_DESCRIPTOR_CLASS = ()
def __init__(self, options, serialized_options, options_class_name):
"""Initialize the descriptor given its options message and the name of the
class of the options message. The name of the class is required in case
the options message is None and has to be created.
"""
self._options = options
self._options_class_name = options_class_name
self._serialized_options = serialized_options
# Does this descriptor have non-default options?
self.has_options = (options is not None) or (serialized_options is not None)
def _SetOptions(self, options, options_class_name):
"""Sets the descriptor's options
This function is used in generated proto2 files to update descriptor
options. It must not be used outside proto2.
"""
self._options = options
self._options_class_name = options_class_name
# Does this descriptor have non-default options?
self.has_options = options is not None
def GetOptions(self):
"""Retrieves descriptor options.
This method returns the options set or creates the default options for the
descriptor.
"""
if self._options:
return self._options
from google.protobuf import descriptor_pb2
try:
options_class = getattr(descriptor_pb2,
self._options_class_name)
except AttributeError:
raise RuntimeError('Unknown options class name %s!' %
(self._options_class_name))
with _lock:
if self._serialized_options is None:
self._options = options_class()
else:
self._options = _ParseOptions(options_class(),
self._serialized_options)
return self._options
class _NestedDescriptorBase(DescriptorBase):
"""Common class for descriptors that can be nested."""
def __init__(self, options, options_class_name, name, full_name,
file, containing_type, serialized_start=None,
serialized_end=None, serialized_options=None):
"""Constructor.
Args:
options: Protocol message options or None
to use default message options.
options_class_name (str): The class name of the above options.
name (str): Name of this protocol message type.
full_name (str): Fully-qualified name of this protocol message type,
which will include protocol "package" name and the name of any
enclosing types.
file (FileDescriptor): Reference to file info.
containing_type: if provided, this is a nested descriptor, with this
descriptor as parent, otherwise None.
serialized_start: The start index (inclusive) in block in the
file.serialized_pb that describes this descriptor.
serialized_end: The end index (exclusive) in block in the
file.serialized_pb that describes this descriptor.
serialized_options: Protocol message serialized options or None.
"""
super(_NestedDescriptorBase, self).__init__(
options, serialized_options, options_class_name)
self.name = name
# TODO(falk): Add function to calculate full_name instead of having it in
# memory?
self.full_name = full_name
self.file = file
self.containing_type = containing_type
self._serialized_start = serialized_start
self._serialized_end = serialized_end
def CopyToProto(self, proto):
"""Copies this to the matching proto in descriptor_pb2.
Args:
proto: An empty proto instance from descriptor_pb2.
Raises:
Error: If self couldn't be serialized, due to to few constructor
arguments.
"""
if (self.file is not None and
self._serialized_start is not None and
self._serialized_end is not None):
proto.ParseFromString(self.file.serialized_pb[
self._serialized_start:self._serialized_end])
else:
raise Error('Descriptor does not contain serialization.')
class Descriptor(_NestedDescriptorBase):
"""Descriptor for a protocol message type.
Attributes:
name (str): Name of this protocol message type.
full_name (str): Fully-qualified name of this protocol message type,
which will include protocol "package" name and the name of any
enclosing types.
containing_type (Descriptor): Reference to the descriptor of the type
containing us, or None if this is top-level.
fields (list[FieldDescriptor]): Field descriptors for all fields in
this type.
fields_by_number (dict(int, FieldDescriptor)): Same
:class:`FieldDescriptor` objects as in :attr:`fields`, but indexed
by "number" attribute in each FieldDescriptor.
fields_by_name (dict(str, FieldDescriptor)): Same
:class:`FieldDescriptor` objects as in :attr:`fields`, but indexed by
"name" attribute in each :class:`FieldDescriptor`.
nested_types (list[Descriptor]): Descriptor references
for all protocol message types nested within this one.
nested_types_by_name (dict(str, Descriptor)): Same Descriptor
objects as in :attr:`nested_types`, but indexed by "name" attribute
in each Descriptor.
enum_types (list[EnumDescriptor]): :class:`EnumDescriptor` references
for all enums contained within this type.
enum_types_by_name (dict(str, EnumDescriptor)): Same
:class:`EnumDescriptor` objects as in :attr:`enum_types`, but
indexed by "name" attribute in each EnumDescriptor.
enum_values_by_name (dict(str, EnumValueDescriptor)): Dict mapping
from enum value name to :class:`EnumValueDescriptor` for that value.
extensions (list[FieldDescriptor]): All extensions defined directly
within this message type (NOT within a nested type).
extensions_by_name (dict(str, FieldDescriptor)): Same FieldDescriptor
objects as :attr:`extensions`, but indexed by "name" attribute of each
FieldDescriptor.
is_extendable (bool): Does this type define any extension ranges?
oneofs (list[OneofDescriptor]): The list of descriptors for oneof fields
in this message.
oneofs_by_name (dict(str, OneofDescriptor)): Same objects as in
:attr:`oneofs`, but indexed by "name" attribute.
file (FileDescriptor): Reference to file descriptor.
"""
if _USE_C_DESCRIPTORS:
_C_DESCRIPTOR_CLASS = _message.Descriptor
def __new__(
cls,
name=None,
full_name=None,
filename=None,
containing_type=None,
fields=None,
nested_types=None,
enum_types=None,
extensions=None,
options=None,
serialized_options=None,
is_extendable=True,
extension_ranges=None,
oneofs=None,
file=None, # pylint: disable=redefined-builtin
serialized_start=None,
serialized_end=None,
syntax=None,
create_key=None):
_message.Message._CheckCalledFromGeneratedFile()
return _message.default_pool.FindMessageTypeByName(full_name)
# NOTE(tmarek): The file argument redefining a builtin is nothing we can
# fix right now since we don't know how many clients already rely on the
# name of the argument.
def __init__(self, name, full_name, filename, containing_type, fields,
nested_types, enum_types, extensions, options=None,
serialized_options=None,
is_extendable=True, extension_ranges=None, oneofs=None,
file=None, serialized_start=None, serialized_end=None, # pylint: disable=redefined-builtin
syntax=None, create_key=None):
"""Arguments to __init__() are as described in the description
of Descriptor fields above.
Note that filename is an obsolete argument, that is not used anymore.
Please use file.name to access this as an attribute.
"""
if create_key is not _internal_create_key:
_Deprecated('Descriptor')
super(Descriptor, self).__init__(
options, 'MessageOptions', name, full_name, file,
containing_type, serialized_start=serialized_start,
serialized_end=serialized_end, serialized_options=serialized_options)
# We have fields in addition to fields_by_name and fields_by_number,
# so that:
# 1. Clients can index fields by "order in which they're listed."
# 2. Clients can easily iterate over all fields with the terse
# syntax: for f in descriptor.fields: ...
self.fields = fields
for field in self.fields:
field.containing_type = self
self.fields_by_number = dict((f.number, f) for f in fields)
self.fields_by_name = dict((f.name, f) for f in fields)
self._fields_by_camelcase_name = None
self.nested_types = nested_types
for nested_type in nested_types:
nested_type.containing_type = self
self.nested_types_by_name = dict((t.name, t) for t in nested_types)
self.enum_types = enum_types
for enum_type in self.enum_types:
enum_type.containing_type = self
self.enum_types_by_name = dict((t.name, t) for t in enum_types)
self.enum_values_by_name = dict(
(v.name, v) for t in enum_types for v in t.values)
self.extensions = extensions
for extension in self.extensions:
extension.extension_scope = self
self.extensions_by_name = dict((f.name, f) for f in extensions)
self.is_extendable = is_extendable
self.extension_ranges = extension_ranges
self.oneofs = oneofs if oneofs is not None else []
self.oneofs_by_name = dict((o.name, o) for o in self.oneofs)
for oneof in self.oneofs:
oneof.containing_type = self
self.syntax = syntax or "proto2"
@property
def fields_by_camelcase_name(self):
"""Same FieldDescriptor objects as in :attr:`fields`, but indexed by
:attr:`FieldDescriptor.camelcase_name`.
"""
if self._fields_by_camelcase_name is None:
self._fields_by_camelcase_name = dict(
(f.camelcase_name, f) for f in self.fields)
return self._fields_by_camelcase_name
def EnumValueName(self, enum, value):
"""Returns the string name of an enum value.
This is just a small helper method to simplify a common operation.
Args:
enum: string name of the Enum.
value: int, value of the enum.
Returns:
string name of the enum value.
Raises:
KeyError if either the Enum doesn't exist or the value is not a valid
value for the enum.
"""
return self.enum_types_by_name[enum].values_by_number[value].name
def CopyToProto(self, proto):
"""Copies this to a descriptor_pb2.DescriptorProto.
Args:
proto: An empty descriptor_pb2.DescriptorProto.
"""
# This function is overridden to give a better doc comment.
super(Descriptor, self).CopyToProto(proto)
# TODO(robinson): We should have aggressive checking here,
# for example:
# * If you specify a repeated field, you should not be allowed
# to specify a default value.
# * [Other examples here as needed].
#
# TODO(robinson): for this and other *Descriptor classes, we
# might also want to lock things down aggressively (e.g.,
# prevent clients from setting the attributes). Having
# stronger invariants here in general will reduce the number
# of runtime checks we must do in reflection.py...
class FieldDescriptor(DescriptorBase):
"""Descriptor for a single field in a .proto file.
Attributes:
name (str): Name of this field, exactly as it appears in .proto.
full_name (str): Name of this field, including containing scope. This is
particularly relevant for extensions.
index (int): Dense, 0-indexed index giving the order that this
field textually appears within its message in the .proto file.
number (int): Tag number declared for this field in the .proto file.
type (int): (One of the TYPE_* constants below) Declared type.
cpp_type (int): (One of the CPPTYPE_* constants below) C++ type used to
represent this field.
label (int): (One of the LABEL_* constants below) Tells whether this
field is optional, required, or repeated.
has_default_value (bool): True if this field has a default value defined,
otherwise false.
default_value (Varies): Default value of this field. Only
meaningful for non-repeated scalar fields. Repeated fields
should always set this to [], and non-repeated composite
fields should always set this to None.
containing_type (Descriptor): Descriptor of the protocol message
type that contains this field. Set by the Descriptor constructor
if we're passed into one.
Somewhat confusingly, for extension fields, this is the
descriptor of the EXTENDED message, not the descriptor
of the message containing this field. (See is_extension and
extension_scope below).
message_type (Descriptor): If a composite field, a descriptor
of the message type contained in this field. Otherwise, this is None.
enum_type (EnumDescriptor): If this field contains an enum, a
descriptor of that enum. Otherwise, this is None.
is_extension: True iff this describes an extension field.
extension_scope (Descriptor): Only meaningful if is_extension is True.
Gives the message that immediately contains this extension field.
Will be None iff we're a top-level (file-level) extension field.
options (descriptor_pb2.FieldOptions): Protocol message field options or
None to use default field options.
containing_oneof (OneofDescriptor): If the field is a member of a oneof
union, contains its descriptor. Otherwise, None.
file (FileDescriptor): Reference to file descriptor.
"""
# Must be consistent with C++ FieldDescriptor::Type enum in
# descriptor.h.
#
# TODO(robinson): Find a way to eliminate this repetition.
TYPE_DOUBLE = 1
TYPE_FLOAT = 2
TYPE_INT64 = 3
TYPE_UINT64 = 4
TYPE_INT32 = 5
TYPE_FIXED64 = 6
TYPE_FIXED32 = 7
TYPE_BOOL = 8
TYPE_STRING = 9
TYPE_GROUP = 10
TYPE_MESSAGE = 11
TYPE_BYTES = 12
TYPE_UINT32 = 13
TYPE_ENUM = 14
TYPE_SFIXED32 = 15
TYPE_SFIXED64 = 16
TYPE_SINT32 = 17
TYPE_SINT64 = 18
MAX_TYPE = 18
# Must be consistent with C++ FieldDescriptor::CppType enum in
# descriptor.h.
#
# TODO(robinson): Find a way to eliminate this repetition.
CPPTYPE_INT32 = 1
CPPTYPE_INT64 = 2
CPPTYPE_UINT32 = 3
CPPTYPE_UINT64 = 4
CPPTYPE_DOUBLE = 5
CPPTYPE_FLOAT = 6
CPPTYPE_BOOL = 7
CPPTYPE_ENUM = 8
CPPTYPE_STRING = 9
CPPTYPE_MESSAGE = 10
MAX_CPPTYPE = 10
_PYTHON_TO_CPP_PROTO_TYPE_MAP = {
TYPE_DOUBLE: CPPTYPE_DOUBLE,
TYPE_FLOAT: CPPTYPE_FLOAT,
TYPE_ENUM: CPPTYPE_ENUM,
TYPE_INT64: CPPTYPE_INT64,
TYPE_SINT64: CPPTYPE_INT64,
TYPE_SFIXED64: CPPTYPE_INT64,
TYPE_UINT64: CPPTYPE_UINT64,
TYPE_FIXED64: CPPTYPE_UINT64,
TYPE_INT32: CPPTYPE_INT32,
TYPE_SFIXED32: CPPTYPE_INT32,
TYPE_SINT32: CPPTYPE_INT32,
TYPE_UINT32: CPPTYPE_UINT32,
TYPE_FIXED32: CPPTYPE_UINT32,
TYPE_BYTES: CPPTYPE_STRING,
TYPE_STRING: CPPTYPE_STRING,
TYPE_BOOL: CPPTYPE_BOOL,
TYPE_MESSAGE: CPPTYPE_MESSAGE,
TYPE_GROUP: CPPTYPE_MESSAGE
}
# Must be consistent with C++ FieldDescriptor::Label enum in
# descriptor.h.
#
# TODO(robinson): Find a way to eliminate this repetition.
LABEL_OPTIONAL = 1
LABEL_REQUIRED = 2
LABEL_REPEATED = 3
MAX_LABEL = 3
# Must be consistent with C++ constants kMaxNumber, kFirstReservedNumber,
# and kLastReservedNumber in descriptor.h
MAX_FIELD_NUMBER = (1 << 29) - 1
FIRST_RESERVED_FIELD_NUMBER = 19000
LAST_RESERVED_FIELD_NUMBER = 19999
if _USE_C_DESCRIPTORS:
_C_DESCRIPTOR_CLASS = _message.FieldDescriptor
def __new__(cls, name, full_name, index, number, type, cpp_type, label,
default_value, message_type, enum_type, containing_type,
is_extension, extension_scope, options=None,
serialized_options=None,
has_default_value=True, containing_oneof=None, json_name=None,
file=None, create_key=None): # pylint: disable=redefined-builtin
_message.Message._CheckCalledFromGeneratedFile()
if is_extension:
return _message.default_pool.FindExtensionByName(full_name)
else:
return _message.default_pool.FindFieldByName(full_name)
def __init__(self, name, full_name, index, number, type, cpp_type, label,
default_value, message_type, enum_type, containing_type,
is_extension, extension_scope, options=None,
serialized_options=None,
has_default_value=True, containing_oneof=None, json_name=None,
file=None, create_key=None): # pylint: disable=redefined-builtin
"""The arguments are as described in the description of FieldDescriptor
attributes above.
Note that containing_type may be None, and may be set later if necessary
(to deal with circular references between message types, for example).
Likewise for extension_scope.
"""
if create_key is not _internal_create_key:
_Deprecated('FieldDescriptor')
super(FieldDescriptor, self).__init__(
options, serialized_options, 'FieldOptions')
self.name = name
self.full_name = full_name
self.file = file
self._camelcase_name = None
if json_name is None:
self.json_name = _ToJsonName(name)
else:
self.json_name = json_name
self.index = index
self.number = number
self.type = type
self.cpp_type = cpp_type
self.label = label
self.has_default_value = has_default_value
self.default_value = default_value
self.containing_type = containing_type
self.message_type = message_type
self.enum_type = enum_type
self.is_extension = is_extension
self.extension_scope = extension_scope
self.containing_oneof = containing_oneof
if api_implementation.Type() == 'cpp':
if is_extension:
self._cdescriptor = _message.default_pool.FindExtensionByName(full_name)
else:
self._cdescriptor = _message.default_pool.FindFieldByName(full_name)
else:
self._cdescriptor = None
@property
def camelcase_name(self):
"""Camelcase name of this field.
Returns:
str: the name in CamelCase.
"""
if self._camelcase_name is None:
self._camelcase_name = _ToCamelCase(self.name)
return self._camelcase_name
@property
def has_presence(self):
"""Whether the field distinguishes between unpopulated and default values.
Raises:
RuntimeError: singular field that is not linked with message nor file.
"""
if self.label == FieldDescriptor.LABEL_REPEATED:
return False
if (self.cpp_type == FieldDescriptor.CPPTYPE_MESSAGE or
self.containing_oneof):
return True
if hasattr(self.file, 'syntax'):
return self.file.syntax == 'proto2'
if hasattr(self.message_type, 'syntax'):
return self.message_type.syntax == 'proto2'
raise RuntimeError(
'has_presence is not ready to use because field %s is not'
' linked with message type nor file' % self.full_name)
@staticmethod
def ProtoTypeToCppProtoType(proto_type):
"""Converts from a Python proto type to a C++ Proto Type.
The Python ProtocolBuffer classes specify both the 'Python' datatype and the
'C++' datatype - and they're not the same. This helper method should
translate from one to another.
Args:
proto_type: the Python proto type (descriptor.FieldDescriptor.TYPE_*)
Returns:
int: descriptor.FieldDescriptor.CPPTYPE_*, the C++ type.
Raises:
TypeTransformationError: when the Python proto type isn't known.
"""
try:
return FieldDescriptor._PYTHON_TO_CPP_PROTO_TYPE_MAP[proto_type]
except KeyError:
raise TypeTransformationError('Unknown proto_type: %s' % proto_type)
class EnumDescriptor(_NestedDescriptorBase):
"""Descriptor for an enum defined in a .proto file.
Attributes:
name (str): Name of the enum type.
full_name (str): Full name of the type, including package name
and any enclosing type(s).
values (list[EnumValueDescriptor]): List of the values
in this enum.
values_by_name (dict(str, EnumValueDescriptor)): Same as :attr:`values`,
but indexed by the "name" field of each EnumValueDescriptor.
values_by_number (dict(int, EnumValueDescriptor)): Same as :attr:`values`,
but indexed by the "number" field of each EnumValueDescriptor.
containing_type (Descriptor): Descriptor of the immediate containing
type of this enum, or None if this is an enum defined at the
top level in a .proto file. Set by Descriptor's constructor
if we're passed into one.
file (FileDescriptor): Reference to file descriptor.
options (descriptor_pb2.EnumOptions): Enum options message or
None to use default enum options.
"""
if _USE_C_DESCRIPTORS:
_C_DESCRIPTOR_CLASS = _message.EnumDescriptor
def __new__(cls, name, full_name, filename, values,
containing_type=None, options=None,
serialized_options=None, file=None, # pylint: disable=redefined-builtin
serialized_start=None, serialized_end=None, create_key=None):
_message.Message._CheckCalledFromGeneratedFile()
return _message.default_pool.FindEnumTypeByName(full_name)
def __init__(self, name, full_name, filename, values,
containing_type=None, options=None,
serialized_options=None, file=None, # pylint: disable=redefined-builtin
serialized_start=None, serialized_end=None, create_key=None):
"""Arguments are as described in the attribute description above.
Note that filename is an obsolete argument, that is not used anymore.
Please use file.name to access this as an attribute.
"""
if create_key is not _internal_create_key:
_Deprecated('EnumDescriptor')
super(EnumDescriptor, self).__init__(
options, 'EnumOptions', name, full_name, file,
containing_type, serialized_start=serialized_start,
serialized_end=serialized_end, serialized_options=serialized_options)
self.values = values
for value in self.values:
value.type = self
self.values_by_name = dict((v.name, v) for v in values)
# Values are reversed to ensure that the first alias is retained.
self.values_by_number = dict((v.number, v) for v in reversed(values))
def CopyToProto(self, proto):
"""Copies this to a descriptor_pb2.EnumDescriptorProto.
Args:
proto (descriptor_pb2.EnumDescriptorProto): An empty descriptor proto.
"""
# This function is overridden to give a better doc comment.
super(EnumDescriptor, self).CopyToProto(proto)
class EnumValueDescriptor(DescriptorBase):
"""Descriptor for a single value within an enum.
Attributes:
name (str): Name of this value.
index (int): Dense, 0-indexed index giving the order that this
value appears textually within its enum in the .proto file.
number (int): Actual number assigned to this enum value.
type (EnumDescriptor): :class:`EnumDescriptor` to which this value
belongs. Set by :class:`EnumDescriptor`'s constructor if we're
passed into one.
options (descriptor_pb2.EnumValueOptions): Enum value options message or
None to use default enum value options options.
"""
if _USE_C_DESCRIPTORS:
_C_DESCRIPTOR_CLASS = _message.EnumValueDescriptor
def __new__(cls, name, index, number,
type=None, # pylint: disable=redefined-builtin
options=None, serialized_options=None, create_key=None):
_message.Message._CheckCalledFromGeneratedFile()
# There is no way we can build a complete EnumValueDescriptor with the
# given parameters (the name of the Enum is not known, for example).
# Fortunately generated files just pass it to the EnumDescriptor()
# constructor, which will ignore it, so returning None is good enough.
return None
def __init__(self, name, index, number,
type=None, # pylint: disable=redefined-builtin
options=None, serialized_options=None, create_key=None):
"""Arguments are as described in the attribute description above."""
if create_key is not _internal_create_key:
_Deprecated('EnumValueDescriptor')
super(EnumValueDescriptor, self).__init__(
options, serialized_options, 'EnumValueOptions')
self.name = name
self.index = index
self.number = number
self.type = type
class OneofDescriptor(DescriptorBase):
"""Descriptor for a oneof field.
Attributes:
name (str): Name of the oneof field.
full_name (str): Full name of the oneof field, including package name.
index (int): 0-based index giving the order of the oneof field inside
its containing type.
containing_type (Descriptor): :class:`Descriptor` of the protocol message
type that contains this field. Set by the :class:`Descriptor` constructor
if we're passed into one.
fields (list[FieldDescriptor]): The list of field descriptors this
oneof can contain.
"""
if _USE_C_DESCRIPTORS:
_C_DESCRIPTOR_CLASS = _message.OneofDescriptor
def __new__(
cls, name, full_name, index, containing_type, fields, options=None,
serialized_options=None, create_key=None):
_message.Message._CheckCalledFromGeneratedFile()
return _message.default_pool.FindOneofByName(full_name)
def __init__(
self, name, full_name, index, containing_type, fields, options=None,
serialized_options=None, create_key=None):
"""Arguments are as described in the attribute description above."""
if create_key is not _internal_create_key:
_Deprecated('OneofDescriptor')
super(OneofDescriptor, self).__init__(
options, serialized_options, 'OneofOptions')
self.name = name
self.full_name = full_name
self.index = index
self.containing_type = containing_type
self.fields = fields
class ServiceDescriptor(_NestedDescriptorBase):
"""Descriptor for a service.
Attributes:
name (str): Name of the service.
full_name (str): Full name of the service, including package name.
index (int): 0-indexed index giving the order that this services
definition appears within the .proto file.
methods (list[MethodDescriptor]): List of methods provided by this
service.
methods_by_name (dict(str, MethodDescriptor)): Same
:class:`MethodDescriptor` objects as in :attr:`methods_by_name`, but
indexed by "name" attribute in each :class:`MethodDescriptor`.
options (descriptor_pb2.ServiceOptions): Service options message or
None to use default service options.
file (FileDescriptor): Reference to file info.
"""
if _USE_C_DESCRIPTORS:
_C_DESCRIPTOR_CLASS = _message.ServiceDescriptor
def __new__(
cls,
name=None,
full_name=None,
index=None,
methods=None,
options=None,
serialized_options=None,
file=None, # pylint: disable=redefined-builtin
serialized_start=None,
serialized_end=None,
create_key=None):
_message.Message._CheckCalledFromGeneratedFile() # pylint: disable=protected-access
return _message.default_pool.FindServiceByName(full_name)
def __init__(self, name, full_name, index, methods, options=None,
serialized_options=None, file=None, # pylint: disable=redefined-builtin
serialized_start=None, serialized_end=None, create_key=None):
if create_key is not _internal_create_key:
_Deprecated('ServiceDescriptor')
super(ServiceDescriptor, self).__init__(
options, 'ServiceOptions', name, full_name, file,
None, serialized_start=serialized_start,
serialized_end=serialized_end, serialized_options=serialized_options)
self.index = index
self.methods = methods
self.methods_by_name = dict((m.name, m) for m in methods)
# Set the containing service for each method in this service.
for method in self.methods:
method.containing_service = self
def FindMethodByName(self, name):
"""Searches for the specified method, and returns its descriptor.
Args:
name (str): Name of the method.
Returns:
MethodDescriptor or None: the descriptor for the requested method, if
found.
"""
return self.methods_by_name.get(name, None)
def CopyToProto(self, proto):
"""Copies this to a descriptor_pb2.ServiceDescriptorProto.
Args:
proto (descriptor_pb2.ServiceDescriptorProto): An empty descriptor proto.
"""
# This function is overridden to give a better doc comment.
super(ServiceDescriptor, self).CopyToProto(proto)
class MethodDescriptor(DescriptorBase):
"""Descriptor for a method in a service.
Attributes:
name (str): Name of the method within the service.
full_name (str): Full name of method.
index (int): 0-indexed index of the method inside the service.
containing_service (ServiceDescriptor): The service that contains this
method.
input_type (Descriptor): The descriptor of the message that this method
accepts.
output_type (Descriptor): The descriptor of the message that this method
returns.
client_streaming (bool): Whether this method uses client streaming.
server_streaming (bool): Whether this method uses server streaming.
options (descriptor_pb2.MethodOptions or None): Method options message, or
None to use default method options.
"""
if _USE_C_DESCRIPTORS:
_C_DESCRIPTOR_CLASS = _message.MethodDescriptor
def __new__(cls,
name,
full_name,
index,
containing_service,
input_type,
output_type,
client_streaming=False,
server_streaming=False,
options=None,
serialized_options=None,
create_key=None):
_message.Message._CheckCalledFromGeneratedFile() # pylint: disable=protected-access
return _message.default_pool.FindMethodByName(full_name)
def __init__(self,
name,
full_name,
index,
containing_service,
input_type,
output_type,
client_streaming=False,
server_streaming=False,
options=None,
serialized_options=None,
create_key=None):
"""The arguments are as described in the description of MethodDescriptor
attributes above.
Note that containing_service may be None, and may be set later if necessary.
"""
if create_key is not _internal_create_key:
_Deprecated('MethodDescriptor')
super(MethodDescriptor, self).__init__(
options, serialized_options, 'MethodOptions')
self.name = name
self.full_name = full_name
self.index = index
self.containing_service = containing_service
self.input_type = input_type
self.output_type = output_type
self.client_streaming = client_streaming
self.server_streaming = server_streaming
def CopyToProto(self, proto):
"""Copies this to a descriptor_pb2.MethodDescriptorProto.
Args:
proto (descriptor_pb2.MethodDescriptorProto): An empty descriptor proto.
Raises:
Error: If self couldn't be serialized, due to too few constructor
arguments.
"""
if self.containing_service is not None:
from google.protobuf import descriptor_pb2
service_proto = descriptor_pb2.ServiceDescriptorProto()
self.containing_service.CopyToProto(service_proto)
proto.CopyFrom(service_proto.method[self.index])
else:
raise Error('Descriptor does not contain a service.')
class FileDescriptor(DescriptorBase):
"""Descriptor for a file. Mimics the descriptor_pb2.FileDescriptorProto.
Note that :attr:`enum_types_by_name`, :attr:`extensions_by_name`, and
:attr:`dependencies` fields are only set by the
:py:mod:`google.protobuf.message_factory` module, and not by the generated
proto code.
Attributes:
name (str): Name of file, relative to root of source tree.
package (str): Name of the package
syntax (str): string indicating syntax of the file (can be "proto2" or
"proto3")
serialized_pb (bytes): Byte string of serialized
:class:`descriptor_pb2.FileDescriptorProto`.
dependencies (list[FileDescriptor]): List of other :class:`FileDescriptor`
objects this :class:`FileDescriptor` depends on.
public_dependencies (list[FileDescriptor]): A subset of
:attr:`dependencies`, which were declared as "public".
message_types_by_name (dict(str, Descriptor)): Mapping from message names
to their :class:`Descriptor`.
enum_types_by_name (dict(str, EnumDescriptor)): Mapping from enum names to
their :class:`EnumDescriptor`.
extensions_by_name (dict(str, FieldDescriptor)): Mapping from extension
names declared at file scope to their :class:`FieldDescriptor`.
services_by_name (dict(str, ServiceDescriptor)): Mapping from services'
names to their :class:`ServiceDescriptor`.
pool (DescriptorPool): The pool this descriptor belongs to. When not
passed to the constructor, the global default pool is used.
"""
if _USE_C_DESCRIPTORS:
_C_DESCRIPTOR_CLASS = _message.FileDescriptor
def __new__(cls, name, package, options=None,
serialized_options=None, serialized_pb=None,
dependencies=None, public_dependencies=None,
syntax=None, pool=None, create_key=None):
# FileDescriptor() is called from various places, not only from generated
# files, to register dynamic proto files and messages.
# pylint: disable=g-explicit-bool-comparison
if serialized_pb == b'':
# Cpp generated code must be linked in if serialized_pb is ''
try:
return _message.default_pool.FindFileByName(name)
except KeyError:
raise RuntimeError('Please link in cpp generated lib for %s' % (name))
elif serialized_pb:
return _message.default_pool.AddSerializedFile(serialized_pb)
else:
return super(FileDescriptor, cls).__new__(cls)
def __init__(self, name, package, options=None,
serialized_options=None, serialized_pb=None,
dependencies=None, public_dependencies=None,
syntax=None, pool=None, create_key=None):
"""Constructor."""
if create_key is not _internal_create_key:
_Deprecated('FileDescriptor')
super(FileDescriptor, self).__init__(
options, serialized_options, 'FileOptions')
if pool is None:
from google.protobuf import descriptor_pool
pool = descriptor_pool.Default()
self.pool = pool
self.message_types_by_name = {}
self.name = name
self.package = package
self.syntax = syntax or "proto2"
self.serialized_pb = serialized_pb
self.enum_types_by_name = {}
self.extensions_by_name = {}
self.services_by_name = {}
self.dependencies = (dependencies or [])
self.public_dependencies = (public_dependencies or [])
def CopyToProto(self, proto):
"""Copies this to a descriptor_pb2.FileDescriptorProto.
Args:
proto: An empty descriptor_pb2.FileDescriptorProto.
"""
proto.ParseFromString(self.serialized_pb)
def _ParseOptions(message, string):
"""Parses serialized options.
This helper function is used to parse serialized options in generated
proto2 files. It must not be used outside proto2.
"""
message.ParseFromString(string)
return message
def _ToCamelCase(name):
"""Converts name to camel-case and returns it."""
capitalize_next = False
result = []
for c in name:
if c == '_':
if result:
capitalize_next = True
elif capitalize_next:
result.append(c.upper())
capitalize_next = False
else:
result += c
# Lower-case the first letter.
if result and result[0].isupper():
result[0] = result[0].lower()
return ''.join(result)
def _OptionsOrNone(descriptor_proto):
"""Returns the value of the field `options`, or None if it is not set."""
if descriptor_proto.HasField('options'):
return descriptor_proto.options
else:
return None
def _ToJsonName(name):
"""Converts name to Json name and returns it."""
capitalize_next = False
result = []
for c in name:
if c == '_':
capitalize_next = True
elif capitalize_next:
result.append(c.upper())
capitalize_next = False
else:
result += c
return ''.join(result)
def MakeDescriptor(desc_proto, package='', build_file_if_cpp=True,
syntax=None):
"""Make a protobuf Descriptor given a DescriptorProto protobuf.
Handles nested descriptors. Note that this is limited to the scope of defining
a message inside of another message. Composite fields can currently only be
resolved if the message is defined in the same scope as the field.
Args:
desc_proto: The descriptor_pb2.DescriptorProto protobuf message.
package: Optional package name for the new message Descriptor (string).
build_file_if_cpp: Update the C++ descriptor pool if api matches.
Set to False on recursion, so no duplicates are created.
syntax: The syntax/semantics that should be used. Set to "proto3" to get
proto3 field presence semantics.
Returns:
A Descriptor for protobuf messages.
"""
if api_implementation.Type() == 'cpp' and build_file_if_cpp:
# The C++ implementation requires all descriptors to be backed by the same
# definition in the C++ descriptor pool. To do this, we build a
# FileDescriptorProto with the same definition as this descriptor and build
# it into the pool.
from google.protobuf import descriptor_pb2
file_descriptor_proto = descriptor_pb2.FileDescriptorProto()
file_descriptor_proto.message_type.add().MergeFrom(desc_proto)
# Generate a random name for this proto file to prevent conflicts with any
# imported ones. We need to specify a file name so the descriptor pool
# accepts our FileDescriptorProto, but it is not important what that file
# name is actually set to.
proto_name = binascii.hexlify(os.urandom(16)).decode('ascii')
if package:
file_descriptor_proto.name = os.path.join(package.replace('.', '/'),
proto_name + '.proto')
file_descriptor_proto.package = package
else:
file_descriptor_proto.name = proto_name + '.proto'
_message.default_pool.Add(file_descriptor_proto)
result = _message.default_pool.FindFileByName(file_descriptor_proto.name)
if _USE_C_DESCRIPTORS:
return result.message_types_by_name[desc_proto.name]
full_message_name = [desc_proto.name]
if package: full_message_name.insert(0, package)
# Create Descriptors for enum types
enum_types = {}
for enum_proto in desc_proto.enum_type:
full_name = '.'.join(full_message_name + [enum_proto.name])
enum_desc = EnumDescriptor(
enum_proto.name, full_name, None, [
EnumValueDescriptor(enum_val.name, ii, enum_val.number,
create_key=_internal_create_key)
for ii, enum_val in enumerate(enum_proto.value)],
create_key=_internal_create_key)
enum_types[full_name] = enum_desc
# Create Descriptors for nested types
nested_types = {}
for nested_proto in desc_proto.nested_type:
full_name = '.'.join(full_message_name + [nested_proto.name])
# Nested types are just those defined inside of the message, not all types
# used by fields in the message, so no loops are possible here.
nested_desc = MakeDescriptor(nested_proto,
package='.'.join(full_message_name),
build_file_if_cpp=False,
syntax=syntax)
nested_types[full_name] = nested_desc
fields = []
for field_proto in desc_proto.field:
full_name = '.'.join(full_message_name + [field_proto.name])
enum_desc = None
nested_desc = None
if field_proto.json_name:
json_name = field_proto.json_name
else:
json_name = None
if field_proto.HasField('type_name'):
type_name = field_proto.type_name
full_type_name = '.'.join(full_message_name +
[type_name[type_name.rfind('.')+1:]])
if full_type_name in nested_types:
nested_desc = nested_types[full_type_name]
elif full_type_name in enum_types:
enum_desc = enum_types[full_type_name]
# Else type_name references a non-local type, which isn't implemented
field = FieldDescriptor(
field_proto.name, full_name, field_proto.number - 1,
field_proto.number, field_proto.type,
FieldDescriptor.ProtoTypeToCppProtoType(field_proto.type),
field_proto.label, None, nested_desc, enum_desc, None, False, None,
options=_OptionsOrNone(field_proto), has_default_value=False,
json_name=json_name, create_key=_internal_create_key)
fields.append(field)
desc_name = '.'.join(full_message_name)
return Descriptor(desc_proto.name, desc_name, None, None, fields,
list(nested_types.values()), list(enum_types.values()), [],
options=_OptionsOrNone(desc_proto),
create_key=_internal_create_key)
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