feat: add a minimal GraphQL client

Author: nejch

docs/api-usage-graphql.rst

@@ -0,0 +1,52 @@
+############################
+Using the GraphQL API (beta)
+############################
+
+python-gitlab provides basic support for executing GraphQL queries and mutations.
+
+.. danger::
+
+   The GraphQL client is experimental and only provides basic support.
+   It does not currently support pagination, obey rate limits,
+   or attempt complex retries. You can use it to build simple queries and mutations.
+
+   It is currently unstable and its implementation may change. You can expect a more
+   mature client in one of the upcoming versions.
+
+The ``gitlab.GraphQL`` class
+==================================
+
+As with the REST client, you connect to a GitLab instance by creating a ``gitlab.GraphQL`` object:
+
+.. code-block:: python
+
+   import gitlab
+
+   # anonymous read-only access for public resources (GitLab.com)
+   gq = gitlab.GraphQL()
+
+   # anonymous read-only access for public resources (self-hosted GitLab instance)
+   gq = gitlab.GraphQL('https://gitlab.example.com')
+
+   # personal access token or OAuth2 token authentication (GitLab.com)
+   gq = gitlab.GraphQL(token='glpat-JVNSESs8EwWRx5yDxM5q')
+
+   # personal access token or OAuth2 token authentication (self-hosted GitLab instance)
+   gq = gitlab.GraphQL('https://gitlab.example.com', token='glpat-JVNSESs8EwWRx5yDxM5q')
+
+Sending queries
+===============
+
+Get the result of a query:
+
+.. code-block:: python
+
+    query = """{
+        query {
+          currentUser {
+            name
+          }
+        }
+    """
+
+    result = gq.execute(query)

docs/api-usage.rst

@@ -1,8 +1,8 @@
-############################
-Getting started with the API
-############################
+##################
+Using the REST API
+##################
 
-python-gitlab only supports GitLab API v4.
+python-gitlab currently only supports v4 of the GitLab REST API.
 
 ``gitlab.Gitlab`` class
 =======================

docs/cli-usage.rst

@@ -1,6 +1,6 @@
-############################
-Getting started with the CLI
-############################
+#############
+Using the CLI
+#############
 
 ``python-gitlab`` provides a :command:`gitlab` command-line tool to interact
 with GitLab servers.

docs/index.rst

@@ -7,6 +7,7 @@
    cli-usage
    api-usage
    api-usage-advanced
+   api-usage-graphql
    cli-examples
    api-objects
    api/gitlab

gitlab/__init__.py

@@ -27,7 +27,7 @@
     __title__,
     __version__,
 )
-from gitlab.client import Gitlab, GitlabList  # noqa: F401
+from gitlab.client import Gitlab, GitlabList, GraphQL  # noqa: F401
 from gitlab.exceptions import *  # noqa: F401,F403
 
 warnings.filterwarnings("default", category=DeprecationWarning, module="^gitlab")
@@ -42,5 +42,6 @@
     "__version__",
     "Gitlab",
     "GitlabList",
+    "GraphQL",
 ]
 __all__.extend(gitlab.exceptions.__all__)

gitlab/_backends/graphql.py

@@ -0,0 +1,24 @@
+from typing import Any
+
+import httpx
+from gql.transport.httpx import HTTPXTransport
+
+
+class GitlabTransport(HTTPXTransport):
+    """A gql httpx transport that reuses an existing httpx.Client.
+    By default, gql's transports do not have a keep-alive session
+    and do not enable providing your own session that's kept open.
+    This transport lets us provide and close our session on our own
+    and provide additional auth.
+    For details, see https://github.com/graphql-python/gql/issues/91.
+    """
+
+    def __init__(self, *args: Any, client: httpx.Client, **kwargs: Any):
+        super().__init__(*args, **kwargs)
+        self.client = client
+
+    def connect(self) -> None:
+        pass
+
+    def close(self) -> None:
+        pass

gitlab/client.py

@@ -25,6 +25,18 @@
 import gitlab.exceptions
 from gitlab import _backends, utils
 
+try:
+    import gql
+    import graphql
+    import httpx
+
+    from ._backends.graphql import GitlabTransport
+
+    _GQL_INSTALLED = True
+except ImportError:  # pragma: no cover
+    _GQL_INSTALLED = False
+
+
 REDIRECT_MSG = (
     "python-gitlab detected a {status_code} ({reason!r}) redirection. You must update "
     "your GitLab URL to the correct URL to avoid issues. The redirection was from: "
@@ -89,7 +101,7 @@ def __init__(
         self._api_version = str(api_version)
         self._server_version: Optional[str] = None
         self._server_revision: Optional[str] = None
-        self._base_url = self._get_base_url(url)
+        self._base_url = utils.get_base_url(url)
         self._url = f"{self._base_url}/api/v{api_version}"
         #: Timeout to use for requests to gitlab server
         self.timeout = timeout
@@ -557,18 +569,6 @@ def _get_session_opts(self) -> Dict[str, Any]:
             "verify": self.ssl_verify,
         }
 
-    @staticmethod
-    def _get_base_url(url: Optional[str] = None) -> str:
-        """Return the base URL with the trailing slash stripped.
-        If the URL is a Falsy value, return the default URL.
-        Returns:
-            The base URL
-        """
-        if not url:
-            return gitlab.const.DEFAULT_URL
-
-        return url.rstrip("/")
-
     def _build_url(self, path: str) -> str:
         """Returns the full url from path.
 
@@ -1296,3 +1296,62 @@ def next(self) -> Dict[str, Any]:
             return self.next()
 
         raise StopIteration
+
+
+class GraphQL:
+    def __init__(
+        self,
+        url: Optional[str] = None,
+        *,
+        token: Optional[str] = None,
+        ssl_verify: Union[bool, str] = True,
+        client: Optional[httpx.Client] = None,
+        timeout: Optional[float] = None,
+        user_agent: str = gitlab.const.USER_AGENT,
+        fetch_schema_from_transport: bool = False,
+    ) -> None:
+        if not _GQL_INSTALLED:
+            raise ImportError(
+                "The GraphQL client could not be initialized because "
+                "the gql dependencies are not installed. "
+                "Install them with 'pip install python-gitlab[graphql]'"
+            )
+        self._base_url = utils.get_base_url(url)
+        self._timeout = timeout
+        self._token = token
+        self._url = f"{self._base_url}/api/graphql"
+        self._user_agent = user_agent
+        self._ssl_verify = ssl_verify
+
+        opts = self._get_client_opts()
+        self._http_client = client or httpx.Client(**opts)
+        self._transport = GitlabTransport(self._url, client=self._http_client)
+        self._client = gql.Client(
+            transport=self._transport,
+            fetch_schema_from_transport=fetch_schema_from_transport,
+        )
+        self._gql = gql.gql
+
+    def __enter__(self) -> "GraphQL":
+        return self
+
+    def __exit__(self, *args: Any) -> None:
+        self._http_client.close()
+
+    def _get_client_opts(self) -> Dict[str, Any]:
+        headers = {"User-Agent": self._user_agent}
+
+        if self._token:
+            headers["Authorization"] = f"Bearer {self._token}"
+
+        return {
+            "headers": headers,
+            "timeout": self._timeout,
+            "verify": self._ssl_verify,
+        }
+
+    def execute(
+        self, request: Union[str, graphql.Source], *args: Any, **kwargs: Any
+    ) -> Any:
+        parsed_document = self._gql(request)
+        return self._client.execute(parsed_document, *args, **kwargs)

gitlab/utils.py

@@ -9,14 +9,26 @@
 
 import requests
 
-from gitlab import types
+from gitlab import const, types
 
 
 class _StdoutStream:
     def __call__(self, chunk: Any) -> None:
         print(chunk)
 
 
+def get_base_url(url: Optional[str] = None) -> str:
+    """Return the base URL with the trailing slash stripped.
+    If the URL is a Falsy value, return the default URL.
+    Returns:
+        The base URL
+    """
+    if not url:
+        return const.DEFAULT_URL
+
+    return url.rstrip("/")
+
+
 def get_content_type(content_type: Optional[str]) -> str:
     message = email.message.Message()
     if content_type is not None:

pyproject.toml

@@ -43,6 +43,7 @@ dynamic = ["version"]
 [project.optional-dependencies]
 autocompletion = ["argcomplete>=1.10.0,<3"]
 yaml = ["PyYaml>=6.0.1"]
+graphql = ["gql[httpx]>=3.5.0,<4"]
 
 [project.scripts]
 gitlab = "gitlab.cli:main"

requirements.txt

@@ -1,2 +1,4 @@
+gql==3.5.0
+httpx==0.27.0
 requests==2.32.3
 requests-toolbelt==1.0.0