def TracerMain_(log, storage_path, backend_name, device_id, pid, interval,
count, trace_native_heap):
"""Entry point for the background periodic tracer task."""
# Initialize storage.
storage = file_storage.Storage(storage_path)
# Initialize the backend.
backend = backends.GetBackend(backend_name)
for k, v in storage.LoadSettings(backend_name).iteritems():
backend.settings[k] = v
# Initialize the device.
device = backends.GetDevice(backend_name, device_id)
for k, v in storage.LoadSettings(device_id).iteritems():
device.settings[k] = v
# Start periodic tracing.
process = device.GetProcess(pid)
log.put((1, 'Starting trace (%d dumps x %s s.). Device: %s, process: %s' % (
count, interval, device.name, process.name)))
datetime_str = datetime.datetime.now().strftime('%Y-%m-%d_%H-%M')
archive_name = '%s - %s - %s' % (datetime_str, device.name, process.name)
archive = storage.OpenArchive(archive_name, create=True)
heaps_to_symbolize = []
for i in xrange(1, count + 1): # [1, count] range is easier to handle.
process = device.GetProcess(pid)
if not process:
log.put((100, 'Process %d died.' % pid))
return 1
# Calculate the completion rate proportionally to 80%. We keep the remaining
# 20% for the final symbolization step (just an approximate estimation).
completion = 80 * i / count
log.put((completion, 'Dumping trace %d of %d' % (i, count)))
archive.StartNewSnapshot()
mmaps = process.DumpMemoryMaps()
log.put((completion, 'Dumped %d memory maps' % len(mmaps)))
archive.StoreMemMaps(mmaps)
if trace_native_heap:
nheap = process.DumpNativeHeap()
log.put((completion, 'Dumped %d native allocs' % len(nheap.allocations)))
archive.StoreNativeHeap(nheap)
heaps_to_symbolize += [nheap]
if i < count:
time.sleep(interval)
log.put((90, 'Symbolizing'))
symbols = backend.ExtractSymbols(heaps_to_symbolize,
device.settings['native_symbol_paths'] or '')
expected_symbols_count = len(set.union(
*[set(x.stack_frames.iterkeys()) for x in heaps_to_symbolize]))
log.put((99, 'Symbolization complete. Got %d symbols (%.1f%%).' % (
len(symbols), 100.0 * len(symbols) / expected_symbols_count)))
archive.StoreSymbols(symbols)
log.put((100, 'Trace complete.'))
return 0
def _SetDeviceOrBackendSettings(args, req_vars): # pylint: disable=W0613
backend = backends.GetBackend(args[0])
if not backend:
return _HTTP_GONE, [], 'Backend not found'
if args[1]:
device = _GetDevice(args)
if not device:
return _HTTP_GONE, [], 'Device not found'
settings = device.settings
storage_name = device.id
else:
settings = backend.settings
storage_name = backend.name
for key in req_vars.iterkeys():
settings[key] = req_vars[key]
_persistent_storage.StoreSettings(storage_name, settings.values)
return _HTTP_OK, [], ''
def _GetDeviceOrBackendSettings(args, req_vars): # pylint: disable=W0613
backend = backends.GetBackend(args[0])
if not backend:
return _HTTP_GONE, [], 'Backend not found'
if args[1]:
device = _GetDevice(args)
if not device:
return _HTTP_GONE, [], 'Device not found'
settings = device.settings
else:
settings = backend.settings
assert (isinstance(settings, backends.Settings))
resp = {}
for key in settings.expected_keys:
resp[key] = {
'description': settings.expected_keys[key],
'value': settings.values[key]
}
return _HTTP_OK, [], resp
