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import logging |
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import time |
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4
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5
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class Worker(object): |
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def __init__(self, reader, encoder, writer, config): |
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""" |
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Setup |
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""" |
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self.config = config |
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self.reader = reader |
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self.encoder = encoder |
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self.writer = writer |
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self.buffer = [] |
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# Field for time measurement |
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self.start_time = None |
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def consume(self): |
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""" |
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Run loop. Consume messages from reader, convert it to the output format and write with writer |
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""" |
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self.init_database() |
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logging.info("Listening for messages on Kafka topic %s...", self.config.kafka_topic) |
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self.start_time = time.time() |
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try: |
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for index, raw_message in enumerate(self.reader.read(), 1): |
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self.buffer.extend(self.encoder.encode(raw_message)) |
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if index % self.config.buffer_size == 0: |
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self.flush() |
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except KeyboardInterrupt: |
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logging.info("Shutdown") |
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def init_database(self): |
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""" |
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Initialize the InfluxDB database if it is not already there |
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""" |
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try: |
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logging.info("Creating InfluxDB database if not exists: %s", self.config.influxdb_dbname) |
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self.writer.create_database(self.config.influxdb_dbname) |
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except Exception as e: |
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logging.info(e) |
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def flush(self): |
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""" Flush values with writer """ |
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try: |
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self.writer.write(self.buffer) |
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if self.config.statistics: |
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self.show_statistics() |
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except Exception as e: |
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logging.warning(e) |
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self.buffer = [] |
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55
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def show_statistics(self): |
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delta = time.time() - self.start_time |
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msg_per_sec = self.config.buffer_size / delta |
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print("Flushing output buffer. {0:.2f} messages/s".format(msg_per_sec)) |
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# Reset timer |
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self.start_time = time.time() |
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62
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def set_reader(self, reader): |
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self.reader = reader |
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65
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def get_reader(self): |
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return self.reader |
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def set_writer(self, writer): |
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self.writer = writer |
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def get_writer(self): |
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return self.writer |
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def get_buffer(self): |
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return self.buffer |
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def get_config(self): |
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return self.config |
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mre /
kafka-influxdb
