Add jsonlines support to fsspec uploader

util/opentelemetry-util-genai/CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Add jsonlines support to fsspec uploader
+  ([https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3791](#3791))
+
 ## Version 0.1b0 (2025-09-24)
 
 - Add completion hook to genai utils to implement semconv v1.37.

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

@@ -24,6 +24,7 @@
 from contextlib import ExitStack
 from dataclasses import asdict, dataclass
 from functools import partial
+from os import environ
 from time import time
 from typing import Any, Callable, Final, Literal, TextIO, cast
 from uuid import uuid4
@@ -35,6 +36,9 @@
 from opentelemetry.trace import Span
 from opentelemetry.util.genai import types
 from opentelemetry.util.genai.completion_hook import CompletionHook
+from opentelemetry.util.genai.environment_variables import (
+    OTEL_INSTRUMENTATION_GENAI_UPLOAD_FORMAT,
+)
 
 GEN_AI_INPUT_MESSAGES_REF: Final = (
     gen_ai_attributes.GEN_AI_INPUT_MESSAGES + "_ref"
@@ -46,6 +50,10 @@
     gen_ai_attributes.GEN_AI_SYSTEM_INSTRUCTIONS + "_ref"
 )
 
+_MESSAGE_INDEX_KEY = "index"
+
+Format = Literal["json", "jsonl"]
+_FORMATS: tuple[Format, ...] = ("json", "jsonl")
 
 _logger = logging.getLogger(__name__)
 
@@ -94,10 +102,27 @@ def __init__(
         *,
         base_path: str,
         max_size: int = 20,
+        upload_format: Format | None = None,
     ) -> None:
         self._base_path = base_path
         self._max_size = max_size
 
+        if upload_format not in _FORMATS + (None,):
+            raise ValueError(
+                f"Invalid {upload_format=}. Must be one of {_FORMATS}"
+            )
+
+        if upload_format is None:
+            environ_format = environ.get(
+                OTEL_INSTRUMENTATION_GENAI_UPLOAD_FORMAT, "json"
+            ).lower()
+            if environ_format not in _FORMATS:
+                upload_format = "json"
+            else:
+                upload_format = environ_format
+
+        self._format: Final[Literal["json", "jsonl"]] = upload_format
+
         # Use a ThreadPoolExecutor for its queueing and thread management. The semaphore
         # limits the number of queued tasks. If the queue is full, data will be dropped.
         self._executor = ThreadPoolExecutor(max_workers=max_size)
@@ -139,27 +164,39 @@ def _calculate_ref_path(self) -> CompletionRefs:
         uuid_str = str(uuid4())
         return CompletionRefs(
             inputs_ref=posixpath.join(
-                self._base_path, f"{uuid_str}_inputs.json"
+                self._base_path, f"{uuid_str}_inputs.{self._format}"
             ),
             outputs_ref=posixpath.join(
-                self._base_path, f"{uuid_str}_outputs.json"
+                self._base_path, f"{uuid_str}_outputs.{self._format}"
             ),
             system_instruction_ref=posixpath.join(
-                self._base_path, f"{uuid_str}_system_instruction.json"
+                self._base_path,
+                f"{uuid_str}_system_instruction.{self._format}",
             ),
         )
 
-    @staticmethod
     def _do_upload(
-        path: str, json_encodeable: Callable[[], JsonEncodeable]
+        self, path: str, json_encodeable: Callable[[], JsonEncodeable]
     ) -> None:
+        if self._format == "json":
+            # output as a single line with the json messages array
+            message_lines = [json_encodeable()]
+        else:
+            # output as one line per message in the array
+            message_lines = json_encodeable()
+            # add an index for streaming readers of jsonl
+            for message_idx, line in enumerate(message_lines):
+                line[_MESSAGE_INDEX_KEY] = message_idx
+
         with fsspec_open(path, "w") as file:
-            json.dump(
-                json_encodeable(),
-                file,
-                separators=(",", ":"),
-                cls=Base64JsonEncoder,
-            )
+            for message in message_lines:
+                json.dump(
+                    message,
+                    file,
+                    separators=(",", ":"),
+                    cls=Base64JsonEncoder,
+                )
+                file.write("\n")
 
     def on_completion(
         self,

util/opentelemetry-util-genai/src/opentelemetry/util/genai/environment_variables.py

@@ -43,3 +43,13 @@
    <https://filesystem-spec.readthedocs.io/en/latest/features.html#url-chaining>`_ for advanced
    use cases.
 """
+
+OTEL_INSTRUMENTATION_GENAI_UPLOAD_FORMAT = (
+    "OTEL_INSTRUMENTATION_GENAI_UPLOAD_FORMAT"
+)
+"""
+.. envvar:: OTEL_INSTRUMENTATION_GENAI_UPLOAD_FORMAT
+
+The format to use when uploading prompt and response data. Must be one of ``json`` or
+``jsonl``. Defaults to ``json``.
+"""

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

@@ -19,7 +19,6 @@
 import sys
 import threading
 from contextlib import contextmanager
-from dataclasses import asdict
 from typing import Any
 from unittest import TestCase
 from unittest.mock import MagicMock, patch
@@ -76,6 +75,24 @@ def test_fsspec_entry_point_no_fsspec(self):
         role="user",
         parts=[types.Text(content="What is the capital of France?")],
     ),
+    types.InputMessage(
+        role="assistant",
+        parts=[
+            types.ToolCall(
+                id="get_capital_0",
+                name="get_capital",
+                arguments={"city": "Paris"},
+            )
+        ],
+    ),
+    types.InputMessage(
+        role="user",
+        parts=[
+            types.ToolCallResponse(
+                id="get_capital_0", response={"capital": "Paris"}
+            )
+        ],
+    ),
 ]
 FAKE_OUTPUTS = [
     types.OutputMessage(
@@ -197,6 +214,44 @@ def test_failed_upload_logs(self):
 
         self.assertIn("fsspec uploader failed", logs.output[0])
 
+    def test_invalid_upload_format(self):
+        with self.assertRaisesRegex(ValueError, "Invalid upload_format"):
+            FsspecUploadCompletionHook(
+                base_path=BASE_PATH, upload_format="invalid"
+            )
+
+    def test_parse_upload_format_envvar(self):
+        for envvar_value, expect in (
+            ("", "json"),
+            ("json", "json"),
+            ("invalid", "json"),
+            ("jsonl", "jsonl"),
+            ("jSoNl", "jsonl"),
+        ):
+            with patch.dict(
+                "os.environ",
+                {"OTEL_INSTRUMENTATION_GENAI_UPLOAD_FORMAT": envvar_value},
+                clear=True,
+            ):
+                hook = FsspecUploadCompletionHook(base_path=BASE_PATH)
+                self.addCleanup(hook.shutdown)
+                self.assertEqual(
+                    hook._format,
+                    expect,
+                    f"expected upload format {expect=} with {envvar_value=} got {hook._format}",
+                )
+
+        with patch.dict(
+            "os.environ",
+            {"OTEL_INSTRUMENTATION_GENAI_UPLOAD_FORMAT": "json"},
+            clear=True,
+        ):
+            hook = FsspecUploadCompletionHook(
+                base_path=BASE_PATH, upload_format="jsonl"
+            )
+            self.addCleanup(hook.shutdown)
+            self.assertEqual(hook._format, "jsonl")
+
     def test_upload_after_shutdown_logs(self):
         self.hook.shutdown()
         with self.assertLogs(level=logging.INFO) as logs:
@@ -212,25 +267,15 @@ def test_upload_after_shutdown_logs(self):
         )
 
 
-class FsspecUploaderTest(TestCase):
-    def test_upload(self):
-        FsspecUploadCompletionHook._do_upload(
-            "memory://my_path",
-            lambda: [asdict(fake_input) for fake_input in FAKE_INPUTS],
-        )
-
-        with fsspec.open("memory://my_path", "r") as file:
-            self.assertEqual(
-                file.read(),
-                '[{"role":"user","parts":[{"content":"What is the capital of France?","type":"text"}]}]',
-            )
-
-
 class TestFsspecUploadCompletionHookIntegration(TestBase):
     def setUp(self):
         super().setUp()
         self.hook = FsspecUploadCompletionHook(base_path=BASE_PATH)
 
+    def create_hook(self) -> FsspecUploadCompletionHook:
+        self.hook = FsspecUploadCompletionHook(base_path=BASE_PATH)
+        return self.hook
+
     def tearDown(self):
         super().tearDown()
         self.hook.shutdown()
@@ -271,15 +316,15 @@ def test_upload_completions(self):
 
         self.assert_fsspec_equal(
             span.attributes["gen_ai.input.messages_ref"],
-            '[{"role":"user","parts":[{"content":"What is the capital of France?","type":"text"}]}]',
+            '[{"role":"user","parts":[{"content":"What is the capital of France?","type":"text"}]},{"role":"assistant","parts":[{"arguments":{"city":"Paris"},"name":"get_capital","id":"get_capital_0","type":"tool_call"}]},{"role":"user","parts":[{"response":{"capital":"Paris"},"id":"get_capital_0","type":"tool_call_response"}]}]\n',
         )
         self.assert_fsspec_equal(
             span.attributes["gen_ai.output.messages_ref"],
-            '[{"role":"assistant","parts":[{"content":"Paris","type":"text"}],"finish_reason":"stop"}]',
+            '[{"role":"assistant","parts":[{"content":"Paris","type":"text"}],"finish_reason":"stop"}]\n',
         )
         self.assert_fsspec_equal(
             span.attributes["gen_ai.system_instructions_ref"],
-            '[{"content":"You are a helpful assistant.","type":"text"}]',
+            '[{"content":"You are a helpful assistant.","type":"text"}]\n',
         )
 
     def test_stamps_empty_log(self):
@@ -316,5 +361,59 @@ def test_upload_bytes(self) -> None:
 
         self.assert_fsspec_equal(
             log_record.attributes["gen_ai.input.messages_ref"],
-            '[{"role":"user","parts":[{"content":"What is the capital of France?","type":"text"},{"type":"generic_bytes","bytes":"aGVsbG8="}]}]',
+            '[{"role":"user","parts":[{"content":"What is the capital of France?","type":"text"},{"type":"generic_bytes","bytes":"aGVsbG8="}]}]\n',
+        )
+
+    def test_upload_json(self) -> None:
+        hook = FsspecUploadCompletionHook(
+            base_path=BASE_PATH, upload_format="json"
+        )
+        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.endswith(".json"), f"{ref_uri=} does not end with .json"
+        )
+
+        self.assert_fsspec_equal(
+            ref_uri,
+            '[{"role":"user","parts":[{"content":"What is the capital of France?","type":"text"}]},{"role":"assistant","parts":[{"arguments":{"city":"Paris"},"name":"get_capital","id":"get_capital_0","type":"tool_call"}]},{"role":"user","parts":[{"response":{"capital":"Paris"},"id":"get_capital_0","type":"tool_call_response"}]}]\n',
+        )
+
+    def test_upload_jsonlines(self) -> None:
+        hook = FsspecUploadCompletionHook(
+            base_path=BASE_PATH, 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.endswith(".jsonl"), f"{ref_uri=} does not end with .jsonl"
+        )
+
+        self.assert_fsspec_equal(
+            ref_uri,
+            """\
+{"role":"user","parts":[{"content":"What is the capital of France?","type":"text"}],"index":0}
+{"role":"assistant","parts":[{"arguments":{"city":"Paris"},"name":"get_capital","id":"get_capital_0","type":"tool_call"}],"index":1}
+{"role":"user","parts":[{"response":{"capital":"Paris"},"id":"get_capital_0","type":"tool_call_response"}],"index":2}
+""",
         )