Fix default_metadata for files API. (#548)

* Fix default_metadata for files API.

Change-Id: Ibba74ccda137fe4ac62525868e036a0a0d612348

* Pass the metadata through to the discovert URL

Change-Id: If8f938a1026d46aafc617d1c0e95360c463f0ba0

* fix tests, getmembers doesn't return classmethod/staticmetnod objects.

Change-Id: I9449c6f3299f820fea4128cb598f39cf359cd9ef

* format

Change-Id: I4133647fbea3b6b995ed6edf56bd2a243c2131af

* Add notes describing interaction of the discovery URL and API endpoint.

Change-Id: Ibb8740fd548cc8a8a75b32508d6d05aa6e89f633

* note abput default-metadata

Change-Id: I9647c47718d7b6981692b484b9e9b2ed0f9a42cc

* remove unused import

Change-Id: Ie49216fef5eb13e202fd276fff62e7e20f03b062

google/generativeai/client.py

@@ -2,9 +2,9 @@
 
 import os
 import contextlib
+import inspect
 import dataclasses
 import pathlib
-import types
 from typing import Any, cast
 from collections.abc import Sequence
 import httplib2
@@ -30,6 +30,21 @@
     __version__ = "0.0.0"
 
 USER_AGENT = "genai-py"
+
+#### Caution! ####
+#  - It would make sense for the discovery URL to respect the client_options.endpoint setting.
+#    - That would make testing Files on the staging server possible.
+#  - We tried fixing this once, but broke colab in the process because their endpoint didn't forward the discovery
+#    requests. https://github.com/google-gemini/generative-ai-python/pull/333
+#  - Kaggle would have a similar problem  (b/362278209).
+#    - I think their proxy would forward the discovery traffic.
+#    - But they don't need to intercept the files-service at all, and uploads of large files could overload them.
+#      - Do the scotty uploads go to the same domain?
+#    - If you do route the discovery call to kaggle, be sure to attach the default_metadata (they need it).
+#  - One solution to all this would be if configure could take overrides per service.
+#    - set client_options.endpoint, but use a different endpoint for file service? It's not clear how best to do that
+#      through the file service.
+##################
 GENAI_API_DISCOVERY_URL = "https://generativelanguage.googleapis.com/$discovery/rest"
 
 
@@ -50,7 +65,7 @@ def __init__(self, *args, **kwargs):
         self._discovery_api = None
         super().__init__(*args, **kwargs)
 
-    def _setup_discovery_api(self):
+    def _setup_discovery_api(self, metadata: dict | Sequence[tuple[str, str]] = ()):
         api_key = self._client_options.api_key
         if api_key is None:
             raise ValueError(
@@ -61,6 +76,7 @@ def _setup_discovery_api(self):
             http=httplib2.Http(),
             postproc=lambda resp, content: (resp, content),
             uri=f"{GENAI_API_DISCOVERY_URL}?version=v1beta&key={api_key}",
+            headers=dict(metadata),
         )
         response, content = request.execute()
         request.http.close()
@@ -78,9 +94,10 @@ def create_file(
         name: str | None = None,
         display_name: str | None = None,
         resumable: bool = True,
+        metadata: Sequence[tuple[str, str]] = (),
     ) -> protos.File:
         if self._discovery_api is None:
-            self._setup_discovery_api()
+            self._setup_discovery_api(metadata)
 
         file = {}
         if name is not None:
@@ -92,6 +109,8 @@ def create_file(
             filename=path, mimetype=mime_type, resumable=resumable
         )
         request = self._discovery_api.media().upload(body={"file": file}, media_body=media)
+        for key, value in metadata:
+            request.headers[key] = value
         result = request.execute()
 
         return self.get_file({"name": result["file"]["name"]})
@@ -226,16 +245,14 @@ def make_client(self, name):
         def keep(name, f):
             if name.startswith("_"):
                 return False
-            elif name == "create_file":
-                return False
-            elif not isinstance(f, types.FunctionType):
-                return False
-            elif isinstance(f, classmethod):
+
+            if not callable(f):
                 return False
-            elif isinstance(f, staticmethod):
+
+            if "metadata" not in inspect.signature(f).parameters.keys():
                 return False
-            else:
-                return True
+
+            return True
 
         def add_default_metadata_wrapper(f):
             def call(*args, metadata=(), **kwargs):
@@ -244,7 +261,7 @@ def call(*args, metadata=(), **kwargs):
 
             return call
 
-        for name, value in cls.__dict__.items():
+        for name, value in inspect.getmembers(cls):
             if not keep(name, value):
                 continue
             f = getattr(client, name)