Give more detail when we cannot process a non-JSON streamed line (#1186)

Pack the line information into job_explanation for technical reasons

Limit line length in these error messages to print to 1000 characters

Update tests to check for more error reporting

ansible_runner/streaming.py

@@ -333,8 +333,13 @@ def run(self):
             try:
                 line = self._input.readline()
                 data = json.loads(line)
-            except (json.decoder.JSONDecodeError, IOError):
-                self.status_callback({'status': 'error', 'job_explanation': 'Failed to JSON parse a line from worker stream.'})
+            except (json.decoder.JSONDecodeError, IOError) as exc:
+                self.status_callback({
+                    'status': 'error',
+                    'job_explanation': (
+                        f'Failed to JSON parse a line from worker stream. Error: {exc} Line with invalid JSON data: {line[:1000]}'
+                    )
+                })
                 break
 
             if 'status' in data:

test/integration/test_transmit_worker_process.py

@@ -459,11 +459,15 @@ def test_garbage_private_dir_worker(tmp_path):
         _output=outgoing_buffer,
         private_data_dir=worker_dir,
     )
-    sent = outgoing_buffer.getvalue()
-    assert b'"status": "error"' in sent
+    outgoing_buffer.seek(0)
+    sent = outgoing_buffer.readline()
+    data = json.loads(sent)
+    assert data['status'] == 'error'
+    assert data['job_explanation'] == 'Failed to extract private data directory on worker.'
+    assert data['result_traceback']
 
 
-def test_unparsable_private_dir_worker(tmp_path):
+def test_unparsable_line_worker(tmp_path):
     worker_dir = tmp_path / 'for_worker'
     worker_dir.mkdir()
     incoming_buffer = io.BytesIO(b'')
@@ -476,18 +480,27 @@ def test_unparsable_private_dir_worker(tmp_path):
         _output=outgoing_buffer,
         private_data_dir=worker_dir,
     )
-    sent = outgoing_buffer.getvalue()
-    assert b'"status": "error"' in sent
+    outgoing_buffer.seek(0)
+    sent = outgoing_buffer.readline()
+    data = json.loads(sent)
+    assert data['status'] == 'error'
+    assert data['job_explanation'] == 'Failed to JSON parse a line from transmit stream.'
 
 
-def test_unparsable_private_dir_processor(tmp_path):
+def test_unparsable_really_big_line_processor(tmp_path):
     process_dir = tmp_path / 'for_process'
     process_dir.mkdir()
-    incoming_buffer = io.BytesIO(b'')
+    incoming_buffer = io.BytesIO(bytes(f'not-json-data with extra garbage:{"f"*10000}', encoding='utf-8'))
+
+    def status_receiver(status_data, runner_config):
+        assert status_data['status'] == 'error'
+        assert 'Failed to JSON parse a line from worker stream.' in status_data['job_explanation']
+        assert 'not-json-data with extra garbage:ffffffffff' in status_data['job_explanation']
+        assert len(status_data['job_explanation']) < 2000
 
-    processor = run(
+    run(
         streamer='process',
         _input=incoming_buffer,
         private_data_dir=process_dir,
+        status_handler=status_receiver
     )
-    assert processor.status == 'error'