# Copyright 2020 The TensorFlow Authors. All Rights Reserved.

#

# 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

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# Unless required by applicable law or agreed to in writing, software

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# ==============================================================================

"""Tests for tensorflow.python.summary.summary_iterator."""

import glob

import os.path

from tensorflow.core.util import event_pb2

from tensorflow.python.framework import test_util

from tensorflow.python.platform import test

from tensorflow.python.summary import summary_iterator

from tensorflow.python.summary.writer import writer

class SummaryIteratorTestCase(test.TestCase):

@test_util.run_deprecated_v1

def testSummaryIteratorEventsAddedAfterEndOfFile(self):

test_dir = os.path.join(self.get_temp_dir(), "events")

with writer.FileWriter(test_dir) as w:

session_log_start = event_pb2.SessionLog.START

w.add_session_log(event_pb2.SessionLog(status=session_log_start), 1)

w.flush()

path = glob.glob(os.path.join(test_dir, "event*"))[0]

rr = summary_iterator.summary_iterator(path)

# The first event should list the file_version.

ev = next(rr)

self.assertEqual("brain.Event:2", ev.file_version)

# The next event should be the START message.

ev = next(rr)

self.assertEqual(1, ev.step)

self.assertEqual(session_log_start, ev.session_log.status)

# Reached EOF.

self.assertRaises(StopIteration, lambda: next(rr))

w.add_session_log(event_pb2.SessionLog(status=session_log_start), 2)

w.flush()

# The new event is read, after previously seeing EOF.

ev = next(rr)

self.assertEqual(2, ev.step)

self.assertEqual(session_log_start, ev.session_log.status)

# Get EOF again.

self.assertRaises(StopIteration, lambda: next(rr))

if __name__ == "__main__":

test.main()