mirror of
https://github.com/ARM-software/workload-automation.git
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79 lines
2.6 KiB
Python
79 lines
2.6 KiB
Python
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# Copyright 2016 ARM Limited
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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import struct
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import datetime
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import os
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class ReventParser(object):
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"""
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Parses revent binary recording files so they can be easily read within python.
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"""
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int32_struct = struct.Struct("<i")
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header_struct = struct.Struct("<6sH")
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event_struct = struct.Struct("<i4xqqHHi")
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def __init__(self):
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self.path = None
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self.device_paths = []
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def parse(self, path):
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ReventParser.check_revent_file(path)
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with open(path, "rb") as f:
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_read_struct(f, ReventParser.header_struct)
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path_count, = _read_struct(f, self.int32_struct)
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for _ in xrange(path_count):
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path_length, = _read_struct(f, self.int32_struct)
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if path_length >= 30:
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raise ValueError("path length too long. corrupt file")
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self.device_paths.append(f.read(path_length))
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while f.tell() < os.path.getsize(path):
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device_id, sec, usec, typ, code, value = _read_struct(f, self.event_struct)
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yield (device_id, datetime.datetime.fromtimestamp(sec + float(usec) / 1000000),
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typ, code, value)
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@staticmethod
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def check_revent_file(path):
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"""
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Checks whether a file starts with "REVENT"
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"""
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with open(path, "rb") as f:
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magic, file_version = _read_struct(f, ReventParser.header_struct)
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if magic != "REVENT":
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msg = "'{}' isn't an revent file, are you using an old recording?"
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raise ValueError(msg.format(path))
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return file_version
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@staticmethod
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def get_revent_duration(path):
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"""
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Takes an ReventParser and returns the duration of the revent recording in seconds.
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"""
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revent_parser = ReventParser().parse(path)
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first = last = next(revent_parser)
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for last in revent_parser:
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pass
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return (last[1] - first[1]).total_seconds()
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def _read_struct(f, struct_spec):
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data = f.read(struct_spec.size)
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return struct_spec.unpack(data)
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