Record content-type and use canonical paths in fsspec gen ai uploader

typings/fsspec/__init__.pyi

@@ -0,0 +1,31 @@
+# Copyright The OpenTelemetry Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Handwritten stubs for fsspec usage in opentelemetry-util-genai"""
+
+from __future__ import annotations
+
+import io
+from typing import Any, Literal
+
+from fsspec.spec import (
+    AbstractFileSystem as RealAbstractFileSystem,
+)
+
+class AbstractFileSystem(RealAbstractFileSystem):
+    def open(
+        self, path: str, mode: Literal["w"], *args: Any, **kwargs: Any
+    ) -> io.TextIOWrapper: ...
+
+def url_to_fs(url: str) -> tuple[AbstractFileSystem, str]: ...

util/opentelemetry-util-genai/CHANGELOG.md

@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3791](#3791))
 - Rename "fsspec_upload" entry point and classes to more generic "upload"
   ([https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3798](#3798))
+- Record content-type and use canonical paths in fsspec genai uploader
+  ([https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3795](#3795))
 
 ## Version 0.1b0 (2025-09-24)
 

util/opentelemetry-util-genai/src/opentelemetry/util/genai/_upload/completion_hook.py

@@ -26,7 +26,7 @@
 from functools import partial
 from os import environ
 from time import time
-from typing import Any, Callable, Final, Literal, TextIO, cast
+from typing import Any, Callable, Final, Literal
 from uuid import uuid4
 
 import fsspec
@@ -78,11 +78,6 @@ class CompletionRefs:
 UploadData = dict[str, Callable[[], JsonEncodeable]]
 
 
-def fsspec_open(urlpath: str, mode: Literal["w"]) -> TextIO:
-    """typed wrapper around `fsspec.open`"""
-    return cast(TextIO, fsspec.open(urlpath, mode))  # pyright: ignore[reportUnknownMemberType]
-
-
 class UploadCompletionHook(CompletionHook):
     """An completion hook using ``fsspec`` to upload to external storage
 
@@ -104,8 +99,9 @@ def __init__(
         max_size: int = 20,
         upload_format: Format | None = None,
     ) -> None:
-        self._base_path = base_path
         self._max_size = max_size
+        self._fs, base_path = fsspec.url_to_fs(base_path)
+        self._base_path = self._fs.unstrip_protocol(base_path)
 
         if upload_format not in _FORMATS + (None,):
             raise ValueError(
@@ -188,7 +184,13 @@ def _do_upload(
             for message_idx, line in enumerate(message_lines):
                 line[_MESSAGE_INDEX_KEY] = message_idx
 
-        with fsspec_open(path, "w") as file:
+        content_type = (
+            "application/json"
+            if self._format == "json"
+            else "application/jsonl"
+        )
+
+        with self._fs.open(path, "w", content_type=content_type) as file:
             for message in message_lines:
                 json.dump(
                     message,

util/opentelemetry-util-genai/tests/test_upload.py

@@ -21,7 +21,7 @@
 from contextlib import contextmanager
 from typing import Any
 from unittest import TestCase
-from unittest.mock import MagicMock, patch
+from unittest.mock import ANY, MagicMock, patch
 
 import fsspec
 
@@ -117,8 +117,9 @@ def setUp(self):
         self._fsspec_patcher = patch(
             "opentelemetry.util.genai._upload.completion_hook.fsspec"
         )
-        self.mock_fsspec = self._fsspec_patcher.start()
-        self.mock_fsspec.open = ThreadSafeMagicMock()
+        mock_fsspec = self._fsspec_patcher.start()
+        self.mock_fs = ThreadSafeMagicMock()
+        mock_fsspec.url_to_fs.return_value = self.mock_fs, ""
 
         self.hook = UploadCompletionHook(
             base_path=BASE_PATH,
@@ -133,12 +134,12 @@ def tearDown(self) -> None:
     def block_upload(self):
         unblock_upload = threading.Event()
 
-        def blocked_upload(*args: Any):
+        def blocked_upload(*args: Any, **kwargs: Any):
             unblock_upload.wait()
             return MagicMock()
 
         try:
-            self.mock_fsspec.open.side_effect = blocked_upload
+            self.mock_fs.open.side_effect = blocked_upload
             yield
         finally:
             unblock_upload.set()
@@ -156,7 +157,7 @@ def test_upload_then_shutdown(self):
         self.hook.shutdown()
 
         self.assertEqual(
-            self.mock_fsspec.open.call_count,
+            self.mock_fs.open.call_count,
             3,
             "should have uploaded 3 files",
         )
@@ -172,7 +173,7 @@ def test_upload_blocked(self):
                 )
 
             self.assertLessEqual(
-                self.mock_fsspec.open.call_count,
+                self.mock_fs.open.call_count,
                 MAXSIZE,
                 f"uploader should only be called {MAXSIZE=} times",
             )
@@ -200,7 +201,7 @@ def test_shutdown_timeout(self):
             self.hook.shutdown(timeout_sec=0.01)
 
     def test_failed_upload_logs(self):
-        self.mock_fsspec.open.side_effect = RuntimeError("failed to upload")
+        self.mock_fs.open.side_effect = RuntimeError("failed to upload")
 
         with self.assertLogs(level=logging.ERROR) as logs:
             self.hook.on_completion(
@@ -216,6 +217,27 @@ def test_invalid_upload_format(self):
         with self.assertRaisesRegex(ValueError, "Invalid upload_format"):
             UploadCompletionHook(base_path=BASE_PATH, upload_format="invalid")
 
+    def test_upload_format_sets_content_type(self):
+        for upload_format, expect_content_type in (
+            ("json", "application/json"),
+            ("jsonl", "application/jsonl"),
+        ):
+            hook = UploadCompletionHook(
+                base_path=BASE_PATH, upload_format=upload_format
+            )
+            self.addCleanup(hook.shutdown)
+
+            hook.on_completion(
+                inputs=FAKE_INPUTS,
+                outputs=FAKE_OUTPUTS,
+                system_instruction=FAKE_SYSTEM_INSTRUCTION,
+            )
+            hook.shutdown()
+
+            self.mock_fs.open.assert_called_with(
+                ANY, "w", content_type=expect_content_type
+            )
+
     def test_parse_upload_format_envvar(self):
         for envvar_value, expect in (
             ("", "json"),
@@ -246,7 +268,11 @@ def test_parse_upload_format_envvar(self):
                 base_path=BASE_PATH, upload_format="jsonl"
             )
             self.addCleanup(hook.shutdown)
-            self.assertEqual(hook._format, "jsonl")
+            self.assertEqual(
+                hook._format,
+                "jsonl",
+                "upload_format kwarg should take precedence",
+            )
 
     def test_upload_after_shutdown_logs(self):
         self.hook.shutdown()
@@ -409,3 +435,26 @@ def test_upload_jsonlines(self) -> None:
 {"role":"user","parts":[{"response":{"capital":"Paris"},"id":"get_capital_0","type":"tool_call_response"}],"index":2}
 """,
         )
+
+    def test_upload_chained_filesystem_ref(self) -> None:
+        """Using a chained filesystem like simplecache should refer to the final remote destination"""
+        hook = UploadCompletionHook(
+            base_path="simplecache::memory",
+            upload_format="jsonl",
+        )
+        self.addCleanup(hook.shutdown)
+        log_record = LogRecord()
+
+        hook.on_completion(
+            inputs=FAKE_INPUTS,
+            outputs=FAKE_OUTPUTS,
+            system_instruction=FAKE_SYSTEM_INSTRUCTION,
+            log_record=log_record,
+        )
+        hook.shutdown()
+
+        ref_uri: str = log_record.attributes["gen_ai.input.messages_ref"]
+        self.assertTrue(
+            ref_uri.startswith("memory://"),
+            f"{ref_uri=} does not start with final destination uri memory://",
+        )