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# Copyright 2014 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import logging
from telemetry.timeline import importer
from telemetry.timeline import trace_data as trace_data_module
class TraceBufferOverflowException(Exception):
pass
class TabIdImporter(importer.TimelineImporter):
def __init__(self, model, trace_data):
# Needs to run after all other importers so overflow events have been
# created on the model.
super(TabIdImporter, self).__init__(
model,
trace_data,
import_order=999)
self._trace_data = trace_data
@staticmethod
def GetSupportedPart():
return trace_data_module.TAB_ID_PART
def ImportEvents(self):
pass
def FinalizeImport(self):
self._CheckTraceBufferOverflow()
self._CreateTabIdsToThreadsMap()
def _CheckTraceBufferOverflow(self):
# Since _CreateTabIdsToThreadsMap() relies on markers output on timeline
# tracing data, it may not work in case we have trace events dropped due to
# trace buffer overflow.
for process in self._model.GetAllProcesses():
if process.trace_buffer_did_overflow:
raise TraceBufferOverflowException(
'Trace buffer of process with pid=%d overflowed at timestamp %d. '
'Raw trace data:\n%s' %
(process.pid, process.trace_buffer_overflow_event.start,
repr(self._trace_data)))
def _CreateTabIdsToThreadsMap(self):
tab_id_events = []
for tab_ids in self._trace_data.GetTracesFor(trace_data_module.TAB_ID_PART):
tab_id_events.extend(tab_ids)
for tab_id in tab_id_events:
try:
timeline_markers = self._model.FindTimelineMarkers(tab_id)
# If timeline_markers with name equals |tab_id| can't be found, it's
# non-fatal.
except Exception:
logging.warning('Cannot find timeline marker for tab with id=%s' %
tab_id)
continue
assert len(timeline_markers) == 1
assert timeline_markers[0].start_thread == timeline_markers[0].end_thread
self._model.AddMappingFromTabIdToRendererThread(
tab_id, timeline_markers[0].start_thread)
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