otel: send BinaryContent information (#1603)

Author: Kludex

pydantic_ai_slim/pydantic_ai/messages.py

@@ -1,5 +1,6 @@
 from __future__ import annotations as _annotations
 
+import base64
 import uuid
 from collections.abc import Sequence
 from dataclasses import dataclass, field, replace
@@ -341,6 +342,9 @@ def otel_event(self) -> Event:
                     content.append(part)
                 elif isinstance(part, (ImageUrl, AudioUrl, DocumentUrl, VideoUrl)):
                     content.append({'kind': part.kind, 'url': part.url})
+                elif isinstance(part, BinaryContent):
+                    base64_data = base64.b64encode(part.data).decode()
+                    content.append({'kind': part.kind, 'content': base64_data, 'media_type': part.media_type})
                 else:
                     content.append({'kind': part.kind})
         return Event('gen_ai.user.message', body={'content': content, 'role': 'user'})

tests/models/test_instrumented.py

@@ -36,7 +36,7 @@
 from pydantic_ai.settings import ModelSettings
 from pydantic_ai.usage import Usage
 
-from ..conftest import try_import
+from ..conftest import IsStr, try_import
 
 with try_import() as imports_successful:
     from logfire.testing import CaptureLogfire
@@ -796,7 +796,7 @@ def test_messages_to_otel_events_image_url(document_content: BinaryContent):
                 'event.name': 'gen_ai.user.message',
             },
             {
-                'content': ['user_prompt6', {'kind': 'binary'}],
+                'content': ['user_prompt6', {'kind': 'binary', 'content': IsStr(), 'media_type': 'application/pdf'}],
                 'role': 'user',
                 'gen_ai.message.index': 5,
                 'event.name': 'gen_ai.user.message',