Complete basic callback duration processing

analysis/lttng_models.py

@@ -1,7 +1,7 @@
 # Model objects for LTTng traces/events
 
 def get_field(event, field_name, default=None):
-    return event.get(field_name, d=default)
+    return event.get(field_name, default)
 
 def get_name(event):
     return get_field(event, '_name')

analysis/ros_processor.py

@@ -6,11 +6,11 @@ def ros_process(events):
     """
     Process unpickled events and create ROS model
     :param events (list(dict(str:str:))): the list of events
+    :return the processor object
     """
     processor = RosProcessor()
-    for event in events:
-        print(f'event: {str(event)}')
-        processor.handle(event)
+    processor.process_events(events)
+    return processor
 
 class RosProcessor():
     """
@@ -19,7 +19,10 @@ class RosProcessor():
     """
     def __init__(self):
         # TODO add other stuff
-        self.callbacks = []
+        # Instances of callback_start for eventual matching
+        self._callback_starts = {}
+        # Callback instances, callback_address: end - start
+        self.callbacks_instances = {}
 
         # Link a ROS trace event to its corresponding handling method
         self._handler_map = {
@@ -28,13 +31,17 @@ class RosProcessor():
             'ros2:rclcpp_subscription_callback_start': self._handle_subscription_callback_start,
             'ros2:rclcpp_subscription_callback_end': self._handle_subscription_callback_end,
         }
-    
-    def handle(self, event):
+
+    def process_events(self, events):
         """
-        Handle an event
-        :param event (dict(str:str)): the event to handle
+        Process events
+        :param events (list(dict(str:str))): the events to process
         """
-        handler_function = self._handler_map.get(get_name(event), d=None)
+        for event in events:
+            self._handle(event)
+
+    def _handle(self, event):
+        handler_function = self._handler_map.get(get_name(event), None)
         if handler_function is not None:
             name = get_name(event)
             pid = get_field(event, 'vpid', default=get_field(event, 'pid'))
@@ -49,13 +56,17 @@ class RosProcessor():
         pass
 
     def _handle_subscription_callback_added(self, event, metadata):
-        # TODO
-        pass
+        # Add the callback address key and create an empty list
+        callback_addr = get_field(event, 'callback')
+        self.callbacks_instances[callback_addr] = []
 
     def _handle_subscription_callback_start(self, event, metadata):
-        # TODO
-        pass
+        callback_addr = get_field(event, 'callback')
+        self._callback_starts[callback_addr] = metadata.timestamp
 
     def _handle_subscription_callback_end(self, event, metadata):
-        # TODO
-        pass
+        callback_addr = get_field(event, 'callback')
+        start_timestamp = self._callback_starts.pop(callback_addr, None)
+        if start_timestamp is not None:
+            duration = metadata.timestamp - start_timestamp
+            self.callbacks_instances[callback_addr].append(duration)

analysis/to_pandas.py

@@ -0,0 +1,17 @@
+# Convert processor object to pandas dataframe
+
+import pandas as pd
+from .ros_processor import RosProcessor
+
+def callback_durations_to_df(ros_processor):
+    callback_addresses = []
+    durations = []
+    for addr in ros_processor.callbacks_instances:
+        for d in ros_processor.callbacks_instances[addr]:
+            callback_addresses.append(addr)
+            durations.append(d)
+
+    return pd.DataFrame(data={
+        'callback_address': callback_addresses,
+        'duration': durations,
+    })

process.py

@@ -3,7 +3,9 @@
 
 import sys
 import pickle
-from tracetools_analysis.analysis.ros import *
+import pandas as pd
+from tracetools_analysis.analysis.ros_processor import *
+from tracetools_analysis.analysis.to_pandas import *
 
 def main(argv=sys.argv):
     if len(argv) != 2:
@@ -14,7 +16,11 @@ def main(argv=sys.argv):
     with open(pickle_filename, 'rb') as f:
         events = _get_events_from_pickled_file(f)
         print(f'imported {len(events)} events')
-        ros_process(events)
+        processor = ros_process(events)
+
+    df = callback_durations_to_df(processor)
+    print(df.to_string())
+
 
 def _get_events_from_pickled_file(file):
     p = pickle.Unpickler(file)