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:
from google.net.proto2.proto import descriptor_pb2
file_descriptor_proto = descriptor_pb2.FileDescriptorProto()
file_descriptor_proto.message_type.add().MergeFrom(desc_proto)
proto_name = str(uuid.uuid4())
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)
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)
for ii, enum_val in enumerate(enum_proto.value)
])
enum_types[full_name] = enum_desc
nested_types = {}
for nested_proto in desc_proto.nested_type:
full_name = '.'.join(full_message_name + [nested_proto.name])
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.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]
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=field_proto.options,
has_default_value=False)
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=desc_proto.options)
def MakeDescriptor(desc_proto, package=''):
"""Make a protobuf Descriptor given a DescriptorProto protobuf.
Args:
desc_proto: The descriptor_pb2.DescriptorProto protobuf message.
package: Optional package name for the new message Descriptor (string).
Returns:
A Descriptor for protobuf messages.
"""
if api_implementation.Type() == 'cpp':
from google.net.proto2.proto import descriptor_pb2
file_descriptor_proto = descriptor_pb2.FileDescriptorProto()
file_descriptor_proto.message_type.add().MergeFrom(desc_proto)
proto_name = str(uuid.uuid4())
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'
if api_implementation.Version() == 2:
_message.BuildFile(file_descriptor_proto.SerializeToString())
else:
cpp_message.BuildFile(file_descriptor_proto.SerializeToString())
full_message_name = [desc_proto.name]
if package: full_message_name.insert(0, package)
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)
for ii, enum_val in enumerate(enum_proto.value)
])
enum_types[full_name] = enum_desc
fields = []
for field_proto in desc_proto.field:
full_name = '.'.join(full_message_name + [field_proto.name])
enum_desc = None
if field_proto.HasField('type_name'):
enum_desc = enum_types.get(field_proto.type_name)
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,
None,
enum_desc,
None,
False,
None,
has_default_value=False)
fields.append(field)
desc_name = '.'.join(full_message_name)
return Descriptor(desc_proto.name, desc_name, None, None, fields, [],
enum_types.values(), [])