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# PyPy does not have ultrajson |
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# See https://github.com/esnme/ultrajson/issues/98 |
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try: |
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import ujson as json |
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except ImportError: |
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import json |
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import logging |
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10
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class Encoder(object): |
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""" |
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An encoder for the Collectd JSON format |
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See https://collectd.org/wiki/index.php/JSON |
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Sample measurements: |
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[{"values":[0],"dstypes":["derive"],"dsnames":["value"],"time":1436372292.412,"interval":10.000,"host":"26f2fc918f50","plugin":"cpu","plugin_instance":"1","type":"cpu","type_instance":"interrupt"}] |
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[ |
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{ |
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"values": [1901474177], |
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"dstypes": ["counter"], |
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"dsnames": ["value"], |
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"time": 1280959128, |
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"interval": 10, |
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"host": "leeloo.octo.it", |
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"plugin": "cpu", |
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"plugin_instance": "0", |
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"type": "cpu", |
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"type_instance": "idle" |
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} |
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] |
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""" |
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def encode(self, msg): |
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measurements = [] |
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for line in msg.decode().split("\n"): |
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try: |
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# Set flag for float precision to get the same |
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# results for Python 2 and 3. |
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json_object = self.parse_line(line) |
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except ValueError as e: |
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logging.debug("Error in encoder: %s", e) |
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continue |
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for entry in json_object: |
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try: |
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# to set plugin, plugin_instance as the measurement name, just need pass ['plugin', 'plugin_instance'] |
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measurement = Encoder.format_measurement_name(entry, ['plugin', 'plugin_instance', 'type']) |
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tags = Encoder.format_tags(entry, ['host', 'type_instance']) |
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value = Encoder.format_value(entry) |
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time = Encoder.format_time(entry) |
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measurements.append(Encoder.compose_data(measurement, tags, value, time)) |
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except Exception as e: |
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logging.debug("Error in input data: %s. Skipping.", e) |
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continue |
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return measurements |
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@staticmethod |
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def parse_line(line): |
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# return json.loads(line, {'precise_float': True}) |
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# for influxdb version > 0.9, timestamp is an integer |
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return json.loads(line) |
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# following methods are added to support customizing measurement name, tags much more flexible |
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@staticmethod |
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def compose_data(measurement, tags, value, time): |
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data = "%s,%s value=%s %s" % (measurement, tags, value, time) |
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return data |
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@staticmethod |
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def format_measurement_name(entry, args): |
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name = [] |
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for arg in args: |
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if arg in entry: |
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# avoid to add extra _ if some entry value is None |
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if entry[arg] != '': |
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name.append(entry[arg]) |
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return '_'.join(name) |
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@staticmethod |
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def format_tags(entry, args): |
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tag = [] |
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for arg in args: |
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if arg in entry: |
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# to avoid add None as tag value |
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if entry[arg] != '': |
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tag.append("%s=%s" % (arg, entry[arg])) |
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return ','.join(tag) |
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@staticmethod |
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def format_time(entry): |
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return int(float(entry['time'])) |
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95
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@staticmethod |
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def format_value(entry): |
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values = entry['values'] |
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if len(values) == 1: |
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return entry['values'][0] |
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else: |
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# support to add multiple values |
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value = ' '.join(str(value) for value in values) |
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return '"%s"' % value |
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105
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106
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mre /
kafka-influxdb
