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import unittest |
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from mock import Mock |
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import random |
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import time |
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from kafka_influxdb.worker import Worker |
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from kafka_influxdb.encoder import echo_encoder |
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from kafka_influxdb.tests.helpers.timeout import timeout |
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from requests.exceptions import ConnectionError |
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from mock import patch |
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class Config: |
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""" |
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Dummy config with minimum settings to pass the tests |
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""" |
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def __init__(self, buffer_size, buffer_timeout): |
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self.buffer_size = buffer_size |
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self.buffer_timeout = buffer_timeout |
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self.kafka_topic = "test" |
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self.influxdb_dbname = "mydb" |
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self.statistics = False |
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class DummyReader(object): |
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""" |
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A reader that yields dummy messages |
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""" |
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def __init__(self, messages, num_messages): |
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self.messages = messages |
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self.num_messages = num_messages |
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def read(self): |
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for i in range(self.num_messages): |
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yield random.choice(self.messages) |
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# Simulate keyboard interrupt by user to stop consuming |
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raise KeyboardInterrupt |
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class TimeoutReader(object): |
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""" |
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A reader that writes half the messages then times out |
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""" |
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def __init__(self, message, num_messages, timeout): |
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self.message = message |
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self.num_messages = num_messages |
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self.timeout = timeout |
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def read(self): |
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for i in range(self.num_messages-1): |
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yield self.message |
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# Simulate no additional messages causing timeout |
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time.sleep(self.timeout) |
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yield False |
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# Stop consuming |
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raise SystemExit |
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class FlakyReader(object): |
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""" |
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A fake reader that throws exceptions to simulate |
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connection errors |
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""" |
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def __init__(self, message, num_messages): |
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self.message = message |
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self.num_messages = num_messages |
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def read(self): |
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# Yield the first half of messages |
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for i in range(int(self.num_messages/2)): |
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yield self.message |
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# Simulate a connection error while reading |
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try: |
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raise Exception |
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except Exception: |
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# Continue like you don't care. |
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# Yield the second half of messages |
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for i in range(int(self.num_messages/2)): |
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yield self.message |
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# Simulate keyboard interrupt by user to stop consuming |
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raise KeyboardInterrupt |
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class TestWorker(unittest.TestCase): |
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""" |
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Tests for message worker. |
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""" |
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def setUp(self): |
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self.config = Config(10, 0.1) |
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self.encoder = echo_encoder.Encoder() |
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self.writer = Mock() |
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self.writer.write.return_value = True |
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@patch('time.sleep', return_value=None) |
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def test_create_database(self, _): |
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""" |
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Retry creating the InfluxDB database in case of a connection error |
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""" |
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reader = DummyReader(["bar"], self.config.buffer_size) |
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writer_with_connection_error = Mock() |
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writer_with_connection_error.create_database = Mock( |
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side_effect=[ConnectionError, None]) |
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client = Worker(reader, self.encoder, |
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writer_with_connection_error, self.config) |
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client.consume() |
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self.assertEqual( |
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writer_with_connection_error.create_database.call_count, 2) |
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def test_flush(self): |
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""" |
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Messages should be flushed to the writer when the buffer is full. |
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""" |
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reader = DummyReader(["bar"], self.config.buffer_size) |
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client = Worker(reader, self.encoder, self.writer, self.config) |
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client.consume() |
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self.assertTrue(self.writer.write.called) |
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self.writer.write.assert_called_once_with( |
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["bar"] * self.config.buffer_size) |
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def test_buffer_timeout(self): |
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""" |
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If the buffer has timed out flush to the writer. |
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""" |
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reader = TimeoutReader( |
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"bar", self.config.buffer_size, self.config.buffer_timeout) |
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client = Worker(reader, self.encoder, self.writer, self.config) |
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client.consume() |
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self.assertTrue(self.writer.write.called) |
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self.writer.write.assert_called_once_with( |
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["bar"] * int(self.config.buffer_size-1)) |
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@timeout(0.1) |
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def test_reconnect(self): |
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""" |
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The worker should reconnect when the connection is interrupted. |
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""" |
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reader = FlakyReader("baz", self.config.buffer_size) |
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client = Worker(reader, self.encoder, self.writer, self.config) |
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client.consume() |
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self.assertTrue(self.writer.write.called) |
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self.writer.write.assert_called_once_with( |
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["baz"] * self.config.buffer_size) |
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mre /
kafka-influxdb
