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from . import default_config |
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import yaml |
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import logging |
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import argparse |
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import collections |
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import sys |
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class ObjectView(object): |
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def __init__(self, d): |
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self.__dict__ = d |
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def load_config(): |
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""" |
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Load settings from default config and optionally |
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overwrite with config file and commandline parameters |
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(in that order). |
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Note: Commandline parameters are of the form |
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--kafka_host="localhost" |
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to make them easy to enter from the cli |
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while the config file parameters are stored in a dict |
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{kafka: { host: localhost }} |
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to avoid redundancy in the key name. |
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So to merge them, we flatten all keys. |
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""" |
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# We start with the default config |
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config = flatten(default_config.DEFAULT_CONFIG) |
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# Read commandline arguments |
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cli_config = flatten(parse_args()) |
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if "configfile" in cli_config: |
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print("Reading config file {}".format(cli_config['configfile'])) |
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configfile = flatten(parse_configfile(cli_config['configfile'])) |
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config = overwrite_config(config, configfile) |
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# Parameters from commandline take precedence over all others |
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config = overwrite_config(config, cli_config) |
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# Set verbosity level |
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if 'verbose' in config: |
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if config['verbose'] == 1: |
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logging.getLogger().setLevel(logging.INFO) |
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elif config['verbose'] > 1: |
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logging.getLogger().setLevel(logging.DEBUG) |
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return ObjectView(config) |
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def overwrite_config(old_values, new_values): |
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config = old_values.copy() |
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config.update(new_values) |
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return config |
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def parse_configfile(configfile): |
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""" |
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Read settings from file |
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""" |
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with open(configfile) as f: |
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try: |
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return yaml.safe_load(f) |
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except Exception as e: |
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logging.fatal("Could not load default config file: ", e) |
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exit(-1) |
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def flatten(d, parent_key='', sep='_'): |
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""" |
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Flatten keys in a dictionary |
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Example: |
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flatten({'a': 1, 'c': {'a': 2, 'b': {'x': 5, 'y' : 10}}, 'd': [1, 2, 3]}) |
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=> {'a': 1, 'c_a': 2, 'c_b_x': 5, 'd': [1, 2, 3], 'c_b_y': 10} |
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""" |
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items = [] |
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for k, v in d.items(): |
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new_key = parent_key + sep + k if parent_key else k |
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if isinstance(v, collections.MutableMapping): |
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items.extend(flatten(v, new_key, sep=sep).items()) |
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else: |
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items.append((new_key, v)) |
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return dict(items) |
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def parse_args(args=sys.argv[1:]): |
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parser = argparse.ArgumentParser(description='A Kafka consumer for InfluxDB', |
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formatter_class=argparse.ArgumentDefaultsHelpFormatter) |
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parser.add_argument('--kafka_host', type=str, default=argparse.SUPPRESS, |
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help="Hostname or IP of Kafka message broker (default: localhost)") |
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parser.add_argument('--kafka_port', type=int, default=argparse.SUPPRESS, |
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help="Port of Kafka message broker (default: 9092)") |
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parser.add_argument('--kafka_topic', type=str, default=argparse.SUPPRESS, |
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help="Topic for metrics (default: my_topic)") |
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parser.add_argument('--kafka_group', type=str, default=argparse.SUPPRESS, |
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help="Kafka consumer group (default: my_group)") |
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parser.add_argument('--influxdb_host', type=str, default=argparse.SUPPRESS, |
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help="InfluxDB hostname or IP (default: localhost)") |
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parser.add_argument('--influxdb_port', type=int, default=argparse.SUPPRESS, |
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help="InfluxDB API port (default: 8086)") |
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parser.add_argument('--influxdb_user', type=str, default=argparse.SUPPRESS, |
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help="InfluxDB username (default: root)") |
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parser.add_argument('--influxdb_password', type=str, default=argparse.SUPPRESS, |
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help="InfluxDB password (default: root)") |
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parser.add_argument('--influxdb_dbname', type=str, default=argparse.SUPPRESS, |
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help="InfluxDB database to write metrics into (default: metrics)") |
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parser.add_argument('--influxdb_use_ssl', default=argparse.SUPPRESS, action="store_true", |
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help="Use SSL connection for InfluxDB (default: False)") |
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parser.add_argument('--influxdb_verify_ssl', default=argparse.SUPPRESS, action="store_true", |
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help="Verify the SSL certificate before connecting (default: False)") |
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parser.add_argument('--influxdb_timeout', type=int, default=argparse.SUPPRESS, |
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help="Max number of seconds to establish a connection to InfluxDB (default: 5)") |
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parser.add_argument('--influxdb_use_udp', default=argparse.SUPPRESS, action="store_true", |
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help="Use UDP connection for InfluxDB (default: False)") |
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parser.add_argument('--influxdb_retention_policy', type=str, default=argparse.SUPPRESS, |
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help="Retention policy for incoming metrics (default: default)") |
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parser.add_argument('--influxdb_time_precision', type=str, default=argparse.SUPPRESS, |
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help="Precision of incoming metrics. Can be one of 's', 'm', 'ms', 'u' (default: s)") |
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parser.add_argument('--encoder', type=str, default=argparse.SUPPRESS, |
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help="Input encoder which converts an incoming message to dictionary " |
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"(default: collectd_graphite_encoder)") |
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parser.add_argument('--buffer_size', type=int, default=argparse.SUPPRESS, |
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help="Maximum number of messages that will be collected before flushing to the backend " |
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"(default: 1000)") |
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parser.add_argument('-c', '--configfile', type=str, default=argparse.SUPPRESS, |
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help="Configfile path (default: None)") |
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parser.add_argument('-s', '--statistics', default=argparse.SUPPRESS, action="store_true", |
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help="Show performance statistics (default: True)") |
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parser.add_argument('-b', '--benchmark', default=argparse.SUPPRESS, action="store_true", |
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help="Run benchmark (default: False)") |
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parser.add_argument('-v', '--verbose', action='count', default=argparse.SUPPRESS, |
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help="Set verbosity level. Increase verbosity by adding a v: -v -vv -vvv (default: 0)") |
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parser.add_argument('--version', action="store_true", help="Show version") |
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cli_args = parser.parse_args(args) |
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# Convert config from argparse Namespace to dict |
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return vars(cli_args) |
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mre /
kafka-influxdb
