Add a parameter route_logs_to_stdout_as_json to the CloudLoggingExporter.

Author: DylanRussell

opentelemetry-exporter-gcp-logging/src/opentelemetry/exporter/cloud_logging/__init__.py

@@ -140,7 +140,9 @@ def __init__(
         project_id: Optional[str] = None,
         default_log_name: Optional[str] = None,
         client: Optional[LoggingServiceV2Client] = None,
+        route_logs_to_stdout_as_json: bool = False,
     ):
+        self.route_logs_to_stdout_as_json = route_logs_to_stdout_as_json
         self.project_id: str
         if not project_id:
             _, default_project_id = google.auth.default()
@@ -151,13 +153,16 @@ def __init__(
             self.default_log_name = default_log_name
         else:
             self.default_log_name = "otel_python_inprocess_log_name_temp"
-        self.client = client or LoggingServiceV2Client(
-            transport=LoggingServiceV2GrpcTransport(
-                channel=LoggingServiceV2GrpcTransport.create_channel(
-                    options=_OPTIONS,
+        if route_logs_to_stdout_as_json and client:
+            raise Exception("Cannot route logs to stdout and set a logging client to send logs to.")
+        if not route_logs_to_stdout_as_json:
+            self.client = client or LoggingServiceV2Client(
+                transport=LoggingServiceV2GrpcTransport(
+                    channel=LoggingServiceV2GrpcTransport.create_channel(
+                        options=_OPTIONS,
+                    )
                 )
             )
-        )
 
     def export(self, batch: Sequence[LogData]):
         now = datetime.datetime.now()
@@ -215,11 +220,16 @@ def export(self, batch: Sequence[LogData]):
                 for k, v in attributes.items()
             }
             _set_payload_in_log_entry(log_entry, log_record.body)
-            log_entries.append(log_entry)
+            if self.route_logs_to_stdout_as_json:
+                print(LogEntry.to_json(log_entry))
+            else:
+                log_entries.append(log_entry)
 
-        self._write_log_entries(log_entries)
+        if not self.route_logs_to_stdout_as_json:
+            self._write_log_entries_to_cloud_logging(log_entries)
+        
 
-    def _write_log_entries(self, log_entries: list[LogEntry]):
+    def _write_log_entries_to_cloud_logging(self, log_entries: list[LogEntry]):
         batch: list[LogEntry] = []
         batch_byte_size = 0
         for entry in log_entries:

opentelemetry-exporter-gcp-logging/tests/test_cloud_logging.py

@@ -66,6 +66,31 @@ def test_too_large_log_raises_warning(caplog) -> None:
         "exceeds Cloud Logging's maximum limit of 256000 bytes" in caplog.text
     )
 
+def test_logs_printed_to_stdout_as_json(capsys) -> None:
+    exporter = CloudLoggingExporter(
+        project_id=PROJECT_ID, route_logs_to_stdout_as_json=True
+    )
+    exporter.export(
+        [
+            LogData(
+                log_record=LogRecord(
+                    body="abc",
+                    resource=Resource({}),
+                    attributes={str(i): "i" * 5 for i in range(5)},
+                ),
+                instrumentation_scope=InstrumentationScope("test"),
+            )
+        ]
+    )
+    stdout = capsys.readouterr().out
+    assert (
+        '"logName": "projects/fakeproject/logs/otel_python_inprocess_log_name_temp"' in stdout
+    )
+    assert (
+        '"textPayload": "abc"' in stdout
+    )
+
+
 
 def test_convert_otlp_dict_body(
     cloudloggingfake: CloudLoggingFake,