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101 lines
3.2 KiB
Python
101 lines
3.2 KiB
Python
#
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# All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
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# its licensors.
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#
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# For complete copyright and license terms please see the LICENSE at the root of this
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# distribution (the "License"). All use of this software is governed by the License,
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# or, if provided, by the license below or the license accompanying this file. Do not
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# remove or modify any license notices. This file 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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#
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from EventLogger.Utils import EventBoundary, EventHeader, EventNameHash, LogHeader, Prolog, PrologId
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def size_align_up(size, align):
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return (size + (align - 1)) & ~(align - 1)
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class Reader(object):
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ReadStatus_Success = 0
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ReadStatus_InsufficientFileSize = -1
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ReadStatus_InvalidFormat = -2
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ReadStatus_NoEvents = -3
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def __init__(self):
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self.log_header = LogHeader()
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self.current_event = EventHeader()
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self.current_thread_id = None
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self.buffer = None
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self.buffer_size = 0
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self.buffer_pos = 0
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def read_log_file(self, file_path):
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with open(file_path, mode='rb') as log_file:
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self.buffer = log_file.read()
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self.buffer_size = len(self.buffer)
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if self.buffer_size < LogHeader.size():
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return Reader.ReadStatus_InsufficientFileSize
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self.log_header.unpack(self.buffer)
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self.buffer_pos = LogHeader.size()
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if self.log_header.get_format() not in LogHeader.accepted_formats():
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return Reader.ReadStatus_InvalidFormat
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if self.buffer_pos + EventHeader.size() > self.buffer_size:
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return Reader.ReadStatus_NoEvents
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self.current_event.unpack(self._get_next(EventHeader.size()))
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self._update_thread_id()
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return Reader.ReadStatus_Success
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def get_log_header(self):
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return self.log_header
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def get_thread_id(self):
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return self.current_thread_id
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def get_event_name(self):
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return EventNameHash(self.current_event.event_id)
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def get_event_size(self):
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return self.current_event.size
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def get_event_flags(self):
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return self.current_event.flags
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def get_event_data(self):
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start = self.buffer_pos + EventHeader.size()
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return self._get_next(self.get_event_size(), override_start=start)
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def get_event_string(self):
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string_data = self.get_event_data()
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return string_data.decode('utf-8')
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def next(self):
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real_size = EventHeader.size() + self.get_event_size()
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self.buffer_pos += size_align_up(real_size, EventBoundary)
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if self.buffer_pos < self.buffer_size:
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self.current_event.unpack(self._get_next(EventHeader.size()))
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self._update_thread_id()
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return True
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return False
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def _get_next(self, size, override_start=None):
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start = override_start or self.buffer_pos
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end = start + size
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return self.buffer[start:end]
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def _update_thread_id(self):
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if self.get_event_name() == PrologId:
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prolog = Prolog()
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prolog.unpack(self._get_next(Prolog.size()))
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self.current_thread_id = prolog.thread_id
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