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# -*- coding: utf-8 -*-
"""Define the line_protocol handler."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
from datetime import datetime
from numbers import Integral
from pytz import UTC
from dateutil.parser import parse
EPOCH = UTC.localize(datetime.utcfromtimestamp(0))
def _to_nanos(timestamp):
delta = timestamp - EPOCH
nanos_in_days = delta.days * 86400 * 10 ** 9
nanos_in_seconds = delta.seconds * 10 ** 9
nanos_in_micros = delta.microseconds * 10 ** 3
return nanos_in_days + nanos_in_seconds + nanos_in_micros
def _convert_timestamp(timestamp, precision=None):
if isinstance(timestamp, Integral):
return timestamp # assume precision is correct if timestamp is int
if isinstance(_get_unicode(timestamp), str):
timestamp = parse(timestamp)
if isinstance(timestamp, datetime):
if not timestamp.tzinfo:
timestamp = UTC.localize(timestamp)
ns = _to_nanos(timestamp)
if precision is None or precision == 'n':
return ns
if precision == 'u':
return ns / 10**3
if precision == 'ms':
return ns / 10**6
if precision == 's':
return ns / 10**9
if precision == 'm':
return ns / 10**9 / 60
if precision == 'h':
return ns / 10**9 / 3600
raise ValueError(timestamp)
def _escape_tag(tag):
tag = _get_unicode(tag, force=True)
return tag.replace(
"\\", "\\\\"
).replace(
" ", "\\ "
).replace(
",", "\\,"
).replace(
"=", "\\="
).replace(
"\n", "\\n"
)
def _escape_tag_value(value):
ret = _escape_tag(value)
if ret.endswith('\\'):
ret += ' '
return ret
def quote_ident(value):
"""Indent the quotes."""
return "\"{}\"".format(value
.replace("\\", "\\\\")
.replace("\"", "\\\"")
.replace("\n", "\\n"))
def quote_literal(value):
"""Quote provided literal."""
return "'{}'".format(value
.replace("\\", "\\\\")
.replace("'", "\\'"))
def _is_float(value):
try:
float(value)
except (TypeError, ValueError):
return False
return True
def _escape_value(value):
if value is None:
return ''
value = _get_unicode(value)
if isinstance(value, str):
return quote_ident(value)
if isinstance(value, int) and not isinstance(value, bool):
return str(value) + 'i'
if isinstance(value, bool):
return str(value)
if _is_float(value):
return repr(float(value))
return str(value)
def _get_unicode(data, force=False):
"""Try to return a text aka unicode object from the given data."""
if isinstance(data, bytes):
return data.decode('utf-8')
if data is None:
return ''
if force:
return str(data)
return data
def make_line(measurement, tags=None, fields=None, time=None, precision=None):
"""Extract the actual point from a given measurement line."""
tags = tags or {}
fields = fields or {}
line = _escape_tag(_get_unicode(measurement))
# tags should be sorted client-side to take load off server
tag_list = []
for tag_key in sorted(tags.keys()):
key = _escape_tag(tag_key)
value = _escape_tag(tags[tag_key])
if key != '' and value != '':
tag_list.append(
"{key}={value}".format(key=key, value=value)
)
if tag_list:
line += ',' + ','.join(tag_list)
field_list = []
for field_key in sorted(fields.keys()):
key = _escape_tag(field_key)
value = _escape_value(fields[field_key])
if key != '' and value != '':
field_list.append("{key}={value}".format(
key=key,
value=value
))
if field_list:
line += ' ' + ','.join(field_list)
if time is not None:
timestamp = _get_unicode(str(int(
_convert_timestamp(time, precision)
)))
line += ' ' + timestamp
return line
def make_lines(data, precision=None):
"""Extract points from given dict.
Extracts the points from the given dict and returns a Unicode string
matching the line protocol introduced in InfluxDB 0.9.0.
"""
lines = []
static_tags = data.get('tags')
for point in data['points']:
if static_tags:
tags = dict(static_tags) # make a copy, since we'll modify
tags.update(point.get('tags') or {})
else:
tags = point.get('tags') or {}
line = make_line(
point.get('measurement', data.get('measurement')),
tags=tags,
fields=point.get('fields'),
precision=precision,
time=point.get('time')
)
lines.append(line)
return '\n'.join(lines) + '\n'
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