Extract trace reading functions

tracetools_read/.gitignore

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+*~
+*.pyc
+

tracetools_read/package.xml

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+<?xml version="1.0"?>
+<?xml-model href="http://download.ros.org/schema/package_format2.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
+<package format="2">
+  <name>tracetools_read</name>
+  <version>0.0.1</version>
+  <description>Tools for reading traces</description>
+  <maintainer email="fixed-term.christophe.bourquebedard@de.bosch.com">Christophe Bedard</maintainer>
+  <maintainer email="ingo.luetkebohle@de.bosch.com">Ingo Lütkebohle</maintainer>
+  <license>Apache 2.0</license>
+  <author email="fixed-term.christophe.bourquebedard@de.bosch.com">Christophe Bedard</author>
+
+  <exec_depend>python3-babeltrace</exec_depend>
+
+  <test_depend>ament_copyright</test_depend>
+  <test_depend>ament_flake8</test_depend>
+  <test_depend>ament_pep257</test_depend>
+  <test_depend>python3-pytest</test_depend>
+
+  <export>
+    <build_type>ament_python</build_type>
+  </export>
+</package>

tracetools_read/setup.cfg

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+[develop]
+script-dir=$base/lib/tracetools_read
+[install]
+install-scripts=$base/lib/tracetools_read

tracetools_read/setup.py

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+from setuptools import find_packages
+from setuptools import setup
+
+package_name = 'tracetools_read'
+
+setup(
+    name=package_name,
+    version='0.0.1',
+    packages=find_packages(exclude=['test']),
+    data_files=[
+        ('share/' + package_name, ['package.xml']),
+    ],
+    install_requires=['setuptools'],
+    maintainer=(
+        'Christophe Bedard, '
+        'Ingo Lütkebohle'
+    ),
+    maintainer_email=(
+        'fixed-term.christophe.bourquebedard@de.bosch.com, '
+        'ingo.luetkebohle@de.bosch.com'
+    ),
+    author='Christophe Bedard',
+    author_email='fixed-term.christophe.bourquebedard@de.bosch.com',
+    # url='',
+    keywords=['ROS'],
+    description='Tools for reading trace',
+    license='Apache 2.0',
+    tests_require=['pytest'],
+)

tracetools_read/test/test_copyright.py

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+# Copyright 2017 Open Source Robotics Foundation, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from ament_copyright.main import main
+import pytest
+
+
+@pytest.mark.copyright
+@pytest.mark.linter
+def test_copyright():
+    rc = main(argv=['.', 'test'])
+    assert rc == 0, 'Found errors'

tracetools_read/test/test_flake8.py

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+# Copyright 2017 Open Source Robotics Foundation, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from ament_flake8.main import main
+import pytest
+
+
+@pytest.mark.flake8
+@pytest.mark.linter
+def test_flake8():
+    rc = main(argv=[])
+    assert rc == 0, 'Found errors'

tracetools_read/test/test_pep257.py

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+# Copyright 2015 Open Source Robotics Foundation, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from ament_pep257.main import main
+import pytest
+
+
+@pytest.mark.linter
+@pytest.mark.pep257
+def test_pep257():
+    rc = main(argv=[])
+    assert rc == 0, 'Found code style errors / warnings'

tracetools_read/tracetools_read/__init__.py

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+# Copyright 2019 Robert Bosch GmbH
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.

tracetools_read/tracetools_read/utils.py

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+# Copyright 2019 Robert Bosch GmbH
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Module with functions for reading traces."""
+
+from typing import Any
+from typing import Dict
+from typing import Iterable
+from typing import List
+
+import babeltrace
+
+
+DictEvent = Dict[str, Any]
+
+
+def _get_trace_ctf_events(trace_directory: str) -> Iterable[babeltrace.babeltrace.Event]:
+    """
+    Get the events of a trace.
+
+    :param trace_directory: the path to the main/top trace directory
+    :return: events iterable
+    """
+    tc = babeltrace.TraceCollection()
+    tc.add_traces_recursive(trace_directory, 'ctf')
+    return tc.events
+
+
+def get_trace_events(trace_directory: str) -> List[DictEvent]:
+    """
+    Get the events of a trace.
+
+    :param trace_directory: the path to the main/top trace directory
+    :return: events
+    """
+    return [event_to_dict(event) for event in _get_trace_ctf_events(trace_directory)]
+
+
+# List of ignored CTF fields
+_IGNORED_FIELDS = [
+    'content_size',
+    'cpu_id',
+    'events_discarded',
+    'id',
+    'packet_size',
+    'packet_seq_num',
+    'stream_id',
+    'stream_instance_id',
+    'timestamp_end',
+    'timestamp_begin',
+    'magic',
+    'uuid',
+    'v',
+]
+_DISCARD = 'events_discarded'
+
+
+def event_to_dict(event: babeltrace.babeltrace.Event) -> DictEvent:
+    """
+    Convert name, timestamp, and all other keys except those in IGNORED_FIELDS into a dictionary.
+
+    :param event: the event to convert
+    :return: the event as a dictionary
+    """
+    d = {'_name': event.name, '_timestamp': event.timestamp}
+    if hasattr(event, _DISCARD) and event[_DISCARD] > 0:
+        print(event[_DISCARD])
+    for key in [key for key in event.keys() if key not in _IGNORED_FIELDS]:
+        d[key] = event[key]
+    return d
+
+
+def get_field(event: DictEvent, field_name: str, default=None, raise_if_not_found=True) -> Any:
+    field_value = event.get(field_name, default)
+    # If enabled, raise exception as soon as possible to avoid headaches
+    if raise_if_not_found and field_value is None:
+        raise AttributeError(f'event field "{field_name}" not found!')
+    return field_value
+
+
+def get_event_name(event: DictEvent) -> str:
+    return event['_name']
+
+
+def get_event_timestamp(event: DictEvent) -> int:
+    return event['_timestamp']
+
+
+def get_procname(event: DictEvent) -> str:
+    return event['procname']