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#!/usr/bin/env python
import logging
import re
import socket
import threading
import time
from timeit import default_timer
from typing import Callable, Tuple
from ..registry import CollectorRegistry, REGISTRY
# Roughly, have to keep to what works as a file name.
# We also remove periods, so labels can be distinguished.
_INVALID_GRAPHITE_CHARS = re.compile(r"[^a-zA-Z0-9_-]")
def _sanitize(s):
return _INVALID_GRAPHITE_CHARS.sub('_', s)
class _RegularPush(threading.Thread):
def __init__(self, pusher, interval, prefix):
super().__init__()
self._pusher = pusher
self._interval = interval
self._prefix = prefix
def run(self):
wait_until = default_timer()
while True:
while True:
now = default_timer()
if now >= wait_until:
# May need to skip some pushes.
while wait_until < now:
wait_until += self._interval
break
# time.sleep can return early.
time.sleep(wait_until - now)
try:
self._pusher.push(prefix=self._prefix)
except OSError:
logging.exception("Push failed")
class GraphiteBridge:
def __init__(self,
address: Tuple[str, int],
registry: CollectorRegistry = REGISTRY,
timeout_seconds: float = 30,
_timer: Callable[[], float] = time.time,
tags: bool = False,
):
self._address = address
self._registry = registry
self._tags = tags
self._timeout = timeout_seconds
self._timer = _timer
def push(self, prefix: str = '') -> None:
now = int(self._timer())
output = []
prefixstr = ''
if prefix:
prefixstr = prefix + '.'
for metric in self._registry.collect():
for s in metric.samples:
if s.labels:
if self._tags:
sep = ';'
fmt = '{0}={1}'
else:
sep = '.'
fmt = '{0}.{1}'
labelstr = sep + sep.join(
[fmt.format(
_sanitize(k), _sanitize(v))
for k, v in sorted(s.labels.items())])
else:
labelstr = ''
output.append(f'{prefixstr}{_sanitize(s.name)}{labelstr} {float(s.value)} {now}\n')
conn = socket.create_connection(self._address, self._timeout)
conn.sendall(''.join(output).encode('ascii'))
conn.close()
def start(self, interval: float = 60.0, prefix: str = '') -> None:
t = _RegularPush(self, interval, prefix)
t.daemon = True
t.start()