python-gitlab/gitlab/base.py at docs/lower-level-api · rithwikch/python-gitlab · GitHub

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# -*- coding: utf-8 -*-

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU Lesser General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

# GNU Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public License

# along with this program. If not, see <http://www.gnu.org/licenses/>.

import importlib

import pprint

import textwrap

from types import ModuleType

from typing import Any, Dict, Iterable, NamedTuple, Optional, Tuple, Type, Union

import gitlab

from gitlab import types as g_types

from gitlab.exceptions import GitlabParsingError

from .client import Gitlab, GitlabList

__all__ = [

"RequiredOptional",

"RESTObject",

"RESTObjectList",

"RESTManager",

]

_URL_ATTRIBUTE_ERROR = (

f"https://python-gitlab.readthedocs.io/en/v{gitlab.__version__}/"

f"faq.html#attribute-error-list"

)

class RESTObject(object):

"""Represents an object built from server data.

It holds the attributes know from the server, and the updated attributes in

another. This allows smart updates, if the object allows it.

You can redefine ``_id_attr`` in child classes to specify which attribute

must be used as uniq ID. ``None`` means that the object can be updated

without ID in the url.

"""

_id_attr: Optional[str] = "id"

_attrs: Dict[str, Any]

_created_from_list: bool # Indicates if object was created from a list() action

_module: ModuleType

_parent_attrs: Dict[str, Any]

_short_print_attr: Optional[str] = None

_updated_attrs: Dict[str, Any]

manager: "RESTManager"

def __init__(

self,

manager: "RESTManager",

attrs: Dict[str, Any],

created_from_list: bool = False,

) -> None:

if not isinstance(attrs, dict):

raise GitlabParsingError(

"Attempted to initialize RESTObject with a non-dictionary value: "

"{!r}\nThis likely indicates an incorrect or malformed server "

"response.".format(attrs)

)

self.__dict__.update(

{

"manager": manager,

"_attrs": attrs,

"_updated_attrs": {},

"_module": importlib.import_module(self.__module__),

"_created_from_list": created_from_list,

}

)

self.__dict__["_parent_attrs"] = self.manager.parent_attrs

self._create_managers()

def __getstate__(self) -> Dict[str, Any]:

state = self.__dict__.copy()

module = state.pop("_module")

state["_module_name"] = module.__name__

return state

def __setstate__(self, state: Dict[str, Any]) -> None:

module_name = state.pop("_module_name")

self.__dict__.update(state)

self.__dict__["_module"] = importlib.import_module(module_name)

def __getattr__(self, name: str) -> Any:

try:

return self.__dict__["_updated_attrs"][name]

except KeyError:

try:

value = self.__dict__["_attrs"][name]

# If the value is a list, we copy it in the _updated_attrs dict

# because we are not able to detect changes made on the object

# (append, insert, pop, ...). Without forcing the attr

# creation __setattr__ is never called, the list never ends up

# in the _updated_attrs dict, and the update() and save()

# method never push the new data to the server.

# See https://github.com/python-gitlab/python-gitlab/issues/306

# note: _parent_attrs will only store simple values (int) so we

# don't make this check in the next except block.

if isinstance(value, list):

self.__dict__["_updated_attrs"][name] = value[:]

return self.__dict__["_updated_attrs"][name]

return value

except KeyError:

try:

return self.__dict__["_parent_attrs"][name]

except KeyError as exc:

message = (

f"{type(self).__name__!r} object has no attribute {name!r}"

)

if self._created_from_list:

message = (

f"{message}\n\n"

+ textwrap.fill(

f"{self.__class__!r} was created via a list() call and "

f"only a subset of the data may be present. To ensure "

f"all data is present get the object using a "

f"get(object.id) call. For more details, see:"

)

+ f"\n\n{_URL_ATTRIBUTE_ERROR}"

)

raise AttributeError(message) from exc

def __setattr__(self, name: str, value: Any) -> None:

self.__dict__["_updated_attrs"][name] = value

def __str__(self) -> str:

data = self._attrs.copy()

data.update(self._updated_attrs)

return f"{type(self)} => {data}"

def pformat(self) -> str:

data = self._attrs.copy()

data.update(self._updated_attrs)

return f"{type(self)} => \n{pprint.pformat(data)}"

def pprint(self) -> None:

print(self.pformat())

def __repr__(self) -> str:

if self._id_attr:

return f"<{self.__class__.__name__} {self._id_attr}:{self.get_id()}>"

else:

return f"<{self.__class__.__name__}>"

def __eq__(self, other: object) -> bool:

if not isinstance(other, RESTObject):

return NotImplemented

if self.get_id() and other.get_id():

return self.get_id() == other.get_id()

return super(RESTObject, self) == other

def __ne__(self, other: object) -> bool:

if not isinstance(other, RESTObject):

return NotImplemented

if self.get_id() and other.get_id():

return self.get_id() != other.get_id()

return super(RESTObject, self) != other

def __dir__(self) -> Iterable[str]:

return set(self.attributes).union(super(RESTObject, self).__dir__())

def __hash__(self) -> int:

if not self.get_id():

return super(RESTObject, self).__hash__()

return hash(self.get_id())

def _create_managers(self) -> None:

# NOTE(jlvillal): We are creating our managers by looking at the class

# annotations. If an attribute is annotated as being a *Manager type

# then we create the manager and assign it to the attribute.

for attr, annotation in sorted(self.__annotations__.items()):

# We ignore creating a manager for the 'manager' attribute as that

# is done in the self.__init__() method

if attr in ("manager",):

continue

if not isinstance(annotation, (type, str)):

continue

if isinstance(annotation, type):

cls_name = annotation.__name__

else:

cls_name = annotation

# All *Manager classes are used except for the base "RESTManager" class

if cls_name == "RESTManager" or not cls_name.endswith("Manager"):

continue

cls = getattr(self._module, cls_name)

manager = cls(self.manager.gitlab, parent=self)

# Since we have our own __setattr__ method, we can't use setattr()

self.__dict__[attr] = manager

def _update_attrs(self, new_attrs: Dict[str, Any]) -> None:

self.__dict__["_updated_attrs"] = {}

self.__dict__["_attrs"] = new_attrs

def get_id(self) -> Optional[Union[int, str]]:

"""Returns the id of the resource."""

if self._id_attr is None or not hasattr(self, self._id_attr):

return None

return getattr(self, self._id_attr)

@property

def encoded_id(self) -> Optional[Union[int, str]]:

"""Ensure that the ID is url-encoded so that it can be safely used in a URL

path"""

obj_id = self.get_id()

if isinstance(obj_id, str):

obj_id = gitlab.utils.EncodedId(obj_id)

return obj_id

@property

def attributes(self) -> Dict[str, Any]:

d = self.__dict__["_updated_attrs"].copy()

d.update(self.__dict__["_attrs"])

d.update(self.__dict__["_parent_attrs"])

return d

class RESTObjectList(object):

"""Generator object representing a list of RESTObject's.

This generator uses the Gitlab pagination system to fetch new data when

required.

Note: you should not instantiate such objects, they are returned by calls

to RESTManager.list()

Args:

manager: Manager to attach to the created objects

obj_cls: Type of objects to create from the json data

_list: A GitlabList object

"""

def __init__(

self, manager: "RESTManager", obj_cls: Type[RESTObject], _list: GitlabList

) -> None:

"""Creates an objects list from a GitlabList.

You should not create objects of this type, but use managers list()

methods instead.

Args:

manager: the RESTManager to attach to the objects

obj_cls: the class of the created objects

_list: the GitlabList holding the data

"""

self.manager = manager

self._obj_cls = obj_cls

self._list = _list

def __iter__(self) -> "RESTObjectList":

return self

def __len__(self) -> int:

return len(self._list)

def __next__(self) -> RESTObject:

return self.next()

def next(self) -> RESTObject:

data = self._list.next()

return self._obj_cls(self.manager, data, created_from_list=True)

@property

def current_page(self) -> int:

"""The current page number."""

return self._list.current_page

@property

def prev_page(self) -> Optional[int]:

"""The previous page number.

If None, the current page is the first.

"""

return self._list.prev_page

@property

def next_page(self) -> Optional[int]:

"""The next page number.

If None, the current page is the last.

"""

return self._list.next_page

@property

def per_page(self) -> int:

"""The number of items per page."""

return self._list.per_page

@property

def total_pages(self) -> Optional[int]:

"""The total number of pages."""

return self._list.total_pages

@property

def total(self) -> Optional[int]:

"""The total number of items."""

return self._list.total

class RequiredOptional(NamedTuple):

required: Tuple[str, ...] = tuple()

optional: Tuple[str, ...] = tuple()

class RESTManager(object):

"""Base class for CRUD operations on objects.

Derived class must define ``_path`` and ``_obj_cls``.

``_path``: Base URL path on which requests will be sent (e.g. '/projects')

``_obj_cls``: The class of objects that will be created

"""

_create_attrs: RequiredOptional = RequiredOptional()

_update_attrs: RequiredOptional = RequiredOptional()

_path: Optional[str] = None

_obj_cls: Optional[Type[RESTObject]] = None

_from_parent_attrs: Dict[str, Any] = {}

_types: Dict[str, Type[g_types.GitlabAttribute]] = {}

_computed_path: Optional[str]

_parent: Optional[RESTObject]

_parent_attrs: Dict[str, Any]

gitlab: Gitlab

def __init__(self, gl: Gitlab, parent: Optional[RESTObject] = None) -> None:

"""REST manager constructor.

Args:

gl: :class:`~gitlab.Gitlab` connection to use to make requests.

parent: REST object to which the manager is attached.

"""

self.gitlab = gl

self._parent = parent # for nested managers

self._computed_path = self._compute_path()

@property

def parent_attrs(self) -> Optional[Dict[str, Any]]:

return self._parent_attrs

def _compute_path(self, path: Optional[str] = None) -> Optional[str]:

self._parent_attrs = {}

if path is None:

path = self._path

if path is None:

return None

if self._parent is None or not self._from_parent_attrs:

return path

data = {

self_attr: getattr(self._parent, parent_attr, None)

for self_attr, parent_attr in self._from_parent_attrs.items()

}

self._parent_attrs = data

return path.format(**data)

@property

def path(self) -> Optional[str]:

return self._computed_path

python-gitlab/gitlab/base.py at docs/lower-level-api · rithwikch/python-gitlab · GitHub

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