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#!/usr/bin/env python
##
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you 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
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import absolute_import, division, print_function
import os
import unittest
from avro import datafile, io, schema
from avro.codecs import Codecs
try:
unicode
except NameError:
unicode = str
SCHEMAS_TO_VALIDATE = (
('"null"', None),
('"boolean"', True),
('"string"', unicode('adsfasdf09809dsf-=adsf')),
('"bytes"', b'12345abcd'),
('"int"', 1234),
('"long"', 1234),
('"float"', 1234.0),
('"double"', 1234.0),
('{"type": "fixed", "name": "Test", "size": 1}', b'B'),
('{"type": "enum", "name": "Test", "symbols": ["A", "B"]}', 'B'),
('{"type": "array", "items": "long"}', [1, 3, 2]),
('{"type": "map", "values": "long"}', {unicode('a'): 1,
unicode('b'): 3,
unicode('c'): 2}),
('["string", "null", "long"]', None),
("""\
{"type": "record",
"name": "Test",
"fields": [{"name": "f", "type": "long"}]}
""", {'f': 5}),
("""\
{"type": "record",
"name": "Lisp",
"fields": [{"name": "value",
"type": ["null", "string",
{"type": "record",
"name": "Cons",
"fields": [{"name": "car", "type": "Lisp"},
{"name": "cdr", "type": "Lisp"}]}]}]}
""", {'value': {'car': {'value': unicode('head')}, 'cdr': {'value': None}}}),
)
FILENAME = 'test_datafile.out'
CODECS_TO_VALIDATE = Codecs.supported_codec_names()
class TestDataFile(unittest.TestCase):
def test_round_trip(self):
print('')
print('TEST ROUND TRIP')
print('===============')
print('')
correct = 0
for i, (example_schema, datum) in enumerate(SCHEMAS_TO_VALIDATE):
for codec in CODECS_TO_VALIDATE:
print('')
print('SCHEMA NUMBER %d' % (i + 1))
print('================')
print('')
print('Schema: %s' % example_schema)
print('Datum: %s' % datum)
print('Codec: %s' % codec)
# write data in binary to file 10 times
writer = open(FILENAME, 'wb')
datum_writer = io.DatumWriter()
schema_object = schema.parse(example_schema)
dfw = datafile.DataFileWriter(writer, datum_writer, schema_object, codec=codec)
for i in range(10):
dfw.append(datum)
dfw.close()
# read data in binary from file
reader = open(FILENAME, 'rb')
datum_reader = io.DatumReader()
dfr = datafile.DataFileReader(reader, datum_reader)
round_trip_data = []
for datum in dfr:
round_trip_data.append(datum)
print('Round Trip Data: %s' % round_trip_data)
print('Round Trip Data Length: %d' % len(round_trip_data))
is_correct = [datum] * 10 == round_trip_data
if is_correct:
correct += 1
print('Correct Round Trip: %s' % is_correct)
print('')
os.remove(FILENAME)
self.assertEquals(correct, len(CODECS_TO_VALIDATE) * len(SCHEMAS_TO_VALIDATE))
def test_append(self):
print('')
print('TEST APPEND')
print('===========')
print('')
correct = 0
for i, (example_schema, datum) in enumerate(SCHEMAS_TO_VALIDATE):
for codec in CODECS_TO_VALIDATE:
print('')
print('SCHEMA NUMBER %d' % (i + 1))
print('================')
print('')
print('Schema: %s' % example_schema)
print('Datum: %s' % datum)
print('Codec: %s' % codec)
# write data in binary to file once
writer = open(FILENAME, 'wb')
datum_writer = io.DatumWriter()
schema_object = schema.parse(example_schema)
dfw = datafile.DataFileWriter(writer, datum_writer, schema_object, codec=codec)
dfw.append(datum)
dfw.close()
# open file, write, and close nine times
for i in range(9):
writer = open(FILENAME, 'ab+')
dfw = datafile.DataFileWriter(writer, io.DatumWriter())
dfw.append(datum)
dfw.close()
# read data in binary from file
reader = open(FILENAME, 'rb')
datum_reader = io.DatumReader()
dfr = datafile.DataFileReader(reader, datum_reader)
appended_data = []
for datum in dfr:
appended_data.append(datum)
print('Appended Data: %s' % appended_data)
print('Appended Data Length: %d' % len(appended_data))
is_correct = [datum] * 10 == appended_data
if is_correct:
correct += 1
print('Correct Appended: %s' % is_correct)
print('')
os.remove(FILENAME)
self.assertEquals(correct, len(CODECS_TO_VALIDATE) * len(SCHEMAS_TO_VALIDATE))
def test_context_manager(self):
"""Test the writer with a 'with' statement."""
writer = open(FILENAME, 'wb')
datum_writer = io.DatumWriter()
sample_schema, sample_datum = SCHEMAS_TO_VALIDATE[1]
schema_object = schema.parse(sample_schema)
with datafile.DataFileWriter(writer, datum_writer, schema_object) as dfw:
dfw.append(sample_datum)
self.assertTrue(writer.closed)
# Test the reader with a 'with' statement.
datums = []
reader = open(FILENAME, 'rb')
datum_reader = io.DatumReader()
with datafile.DataFileReader(reader, datum_reader) as dfr:
for datum in dfr:
datums.append(datum)
self.assertTrue(reader.closed)
def test_metadata(self):
# Test the writer with a 'with' statement.
writer = open(FILENAME, 'wb')
datum_writer = io.DatumWriter()
sample_schema, sample_datum = SCHEMAS_TO_VALIDATE[1]
schema_object = schema.parse(sample_schema)
with datafile.DataFileWriter(writer, datum_writer, schema_object) as dfw:
dfw.set_meta('test.string', b'foo')
dfw.set_meta('test.number', b'1')
dfw.append(sample_datum)
self.assertTrue(writer.closed)
# Test the reader with a 'with' statement.
datums = []
reader = open(FILENAME, 'rb')
datum_reader = io.DatumReader()
with datafile.DataFileReader(reader, datum_reader) as dfr:
self.assertEquals(b'foo', dfr.get_meta('test.string'))
self.assertEquals(b'1', dfr.get_meta('test.number'))
for datum in dfr:
datums.append(datum)
self.assertTrue(reader.closed)
def test_empty_datafile(self):
"""A reader should not fail to read a file consisting of a single empty block."""
sample_schema = schema.parse(SCHEMAS_TO_VALIDATE[1][0])
with datafile.DataFileWriter(open(FILENAME, 'wb'), io.DatumWriter(),
sample_schema) as dfw:
dfw.flush()
# Write an empty block
dfw.encoder.write_long(0)
dfw.encoder.write_long(0)
dfw.writer.write(dfw.sync_marker)
with datafile.DataFileReader(open(FILENAME, 'rb'), io.DatumReader()) as dfr:
self.assertEqual([], list(dfr))
if __name__ == '__main__':
unittest.main()
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