Update LogRecord.to_json to handle bytes field in the body

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Update ConsoleLogExporter.export to handle LogRecord's containing bytes type
+  in the body ([#4614](https://github.com/open-telemetry/opentelemetry-python/pull/4614/)).
+
 ## Version 1.34.0/0.55b0 (2025-06-04)
 
 - typecheck: add sdk/resources and drop mypy

opentelemetry-sdk/src/opentelemetry/sdk/_logs/_internal/__init__.py

@@ -15,6 +15,7 @@
 
 import abc
 import atexit
+import base64
 import concurrent.futures
 import json
 import logging
@@ -61,6 +62,13 @@
 _ENV_VALUE_UNSET = ""
 
 
+class BytesEncoder(json.JSONEncoder):
+    def default(self, o):
+        if isinstance(o, bytes):
+            return base64.b64encode(o).decode()
+        return super().default(o)
+
+
 class LogDroppedAttributesWarning(UserWarning):
     """Custom warning to indicate dropped log attributes due to limits.
 
@@ -248,6 +256,7 @@ def to_json(self, indent: int | None = 4) -> str:
                 "resource": json.loads(self.resource.to_json()),
             },
             indent=indent,
+            cls=BytesEncoder,
         )
 
     @property

opentelemetry-sdk/tests/logs/test_log_record.py

@@ -28,34 +28,10 @@
 
 class TestLogRecord(unittest.TestCase):
     def test_log_record_to_json(self):
-        expected = json.dumps(
-            {
-                "body": "a log line",
-                "severity_number": None,
-                "severity_text": None,
-                "attributes": {
-                    "mapping": {"key": "value"},
-                    "none": None,
-                    "sequence": [1, 2],
-                    "str": "string",
-                },
-                "dropped_attributes": 0,
-                "timestamp": "1970-01-01T00:00:00.000000Z",
-                "observed_timestamp": "1970-01-01T00:00:00.000000Z",
-                "trace_id": "",
-                "span_id": "",
-                "trace_flags": None,
-                "resource": {
-                    "attributes": {"service.name": "foo"},
-                    "schema_url": "",
-                },
-            },
-            indent=4,
-        )
-        actual = LogRecord(
+        log_record = LogRecord(
             timestamp=0,
             observed_timestamp=0,
-            body="a log line",
+            body={"key": "logLine", "bytes": b"123"},
             resource=Resource({"service.name": "foo"}),
             attributes={
                 "mapping": {"key": "value"},
@@ -65,10 +41,9 @@ def test_log_record_to_json(self):
             },
         )
 
-        self.assertEqual(expected, actual.to_json(indent=4))
         self.assertEqual(
-            actual.to_json(indent=None),
-            '{"body": "a log line", "severity_number": null, "severity_text": null, "attributes": {"mapping": {"key": "value"}, "none": null, "sequence": [1, 2], "str": "string"}, "dropped_attributes": 0, "timestamp": "1970-01-01T00:00:00.000000Z", "observed_timestamp": "1970-01-01T00:00:00.000000Z", "trace_id": "", "span_id": "", "trace_flags": null, "resource": {"attributes": {"service.name": "foo"}, "schema_url": ""}}',
+            log_record.to_json(indent=None),
+            '{"body": {"key": "logLine", "bytes": "MTIz"}, "severity_number": null, "severity_text": null, "attributes": {"mapping": {"key": "value"}, "none": null, "sequence": [1, 2], "str": "string"}, "dropped_attributes": 0, "timestamp": "1970-01-01T00:00:00.000000Z", "observed_timestamp": "1970-01-01T00:00:00.000000Z", "trace_id": "", "span_id": "", "trace_flags": null, "resource": {"attributes": {"service.name": "foo"}, "schema_url": ""}}',
         )
 
     def test_log_record_to_json_serializes_severity_number_as_int(self):