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# -*- coding: utf-8 -*-
# Description: varnish netdata python.d module
# Author: ilyam8
# SPDX-License-Identifier: GPL-3.0-or-later
import re
from bases.collection import find_binary
from bases.FrameworkServices.ExecutableService import ExecutableService
ORDER = [
'session_connections',
'client_requests',
'all_time_hit_rate',
'current_poll_hit_rate',
'cached_objects_expired',
'cached_objects_nuked',
'threads_total',
'threads_statistics',
'threads_queue_len',
'backend_connections',
'backend_requests',
'esi_statistics',
'memory_usage',
'uptime'
]
CHARTS = {
'session_connections': {
'options': [None, 'Connections Statistics', 'connections/s',
'client metrics', 'varnish.session_connection', 'line'],
'lines': [
['sess_conn', 'accepted', 'incremental'],
['sess_dropped', 'dropped', 'incremental']
]
},
'client_requests': {
'options': [None, 'Client Requests', 'requests/s',
'client metrics', 'varnish.client_requests', 'line'],
'lines': [
['client_req', 'received', 'incremental']
]
},
'all_time_hit_rate': {
'options': [None, 'All History Hit Rate Ratio', 'percentage', 'cache performance',
'varnish.all_time_hit_rate', 'stacked'],
'lines': [
['cache_hit', 'hit', 'percentage-of-absolute-row'],
['cache_miss', 'miss', 'percentage-of-absolute-row'],
['cache_hitpass', 'hitpass', 'percentage-of-absolute-row']]
},
'current_poll_hit_rate': {
'options': [None, 'Current Poll Hit Rate Ratio', 'percentage', 'cache performance',
'varnish.current_poll_hit_rate', 'stacked'],
'lines': [
['cache_hit', 'hit', 'percentage-of-incremental-row'],
['cache_miss', 'miss', 'percentage-of-incremental-row'],
['cache_hitpass', 'hitpass', 'percentage-of-incremental-row']
]
},
'cached_objects_expired': {
'options': [None, 'Expired Objects', 'expired/s', 'cache performance',
'varnish.cached_objects_expired', 'line'],
'lines': [
['n_expired', 'objects', 'incremental']
]
},
'cached_objects_nuked': {
'options': [None, 'Least Recently Used Nuked Objects', 'nuked/s', 'cache performance',
'varnish.cached_objects_nuked', 'line'],
'lines': [
['n_lru_nuked', 'objects', 'incremental']
]
},
'threads_total': {
'options': [None, 'Number Of Threads In All Pools', 'number', 'thread related metrics',
'varnish.threads_total', 'line'],
'lines': [
['threads', None, 'absolute']
]
},
'threads_statistics': {
'options': [None, 'Threads Statistics', 'threads/s', 'thread related metrics',
'varnish.threads_statistics', 'line'],
'lines': [
['threads_created', 'created', 'incremental'],
['threads_failed', 'failed', 'incremental'],
['threads_limited', 'limited', 'incremental']
]
},
'threads_queue_len': {
'options': [None, 'Current Queue Length', 'requests', 'thread related metrics',
'varnish.threads_queue_len', 'line'],
'lines': [
['thread_queue_len', 'in queue']
]
},
'backend_connections': {
'options': [None, 'Backend Connections Statistics', 'connections/s', 'backend metrics',
'varnish.backend_connections', 'line'],
'lines': [
['backend_conn', 'successful', 'incremental'],
['backend_unhealthy', 'unhealthy', 'incremental'],
['backend_reuse', 'reused', 'incremental'],
['backend_toolate', 'closed', 'incremental'],
['backend_recycle', 'resycled', 'incremental'],
['backend_fail', 'failed', 'incremental']
]
},
'backend_requests': {
'options': [None, 'Requests To The Backend', 'requests/s', 'backend metrics',
'varnish.backend_requests', 'line'],
'lines': [
['backend_req', 'sent', 'incremental']
]
},
'esi_statistics': {
'options': [None, 'ESI Statistics', 'problems/s', 'esi related metrics', 'varnish.esi_statistics', 'line'],
'lines': [
['esi_errors', 'errors', 'incremental'],
['esi_warnings', 'warnings', 'incremental']
]
},
'memory_usage': {
'options': [None, 'Memory Usage', 'MiB', 'memory usage', 'varnish.memory_usage', 'stacked'],
'lines': [
['memory_free', 'free', 'absolute', 1, 1 << 20],
['memory_allocated', 'allocated', 'absolute', 1, 1 << 20]]
},
'uptime': {
'lines': [
['uptime', None, 'absolute']
],
'options': [None, 'Uptime', 'seconds', 'uptime', 'varnish.uptime', 'line']
}
}
VARNISHSTAT = 'varnishstat'
class Parser:
_backend_new = re.compile(r'VBE.([\d\w_.]+)\(.*?\).(beresp[\w_]+)\s+(\d+)')
_backend_old = re.compile(r'VBE\.[\d\w-]+\.([\w\d_]+).(beresp[\w_]+)\s+(\d+)')
_default = re.compile(r'([A-Z]+\.)?([\d\w_.]+)\s+(\d+)')
def __init__(self):
self.re_default = None
self.re_backend = None
def init(self, data):
data = ''.join(data)
parsed_main = Parser._default.findall(data)
if parsed_main:
self.re_default = Parser._default
parsed_backend = Parser._backend_new.findall(data)
if parsed_backend:
self.re_backend = Parser._backend_new
else:
parsed_backend = Parser._backend_old.findall(data)
if parsed_backend:
self.re_backend = Parser._backend_old
def server_stats(self, data):
return self.re_default.findall(''.join(data))
def backend_stats(self, data):
return self.re_backend.findall(''.join(data))
class Service(ExecutableService):
def __init__(self, configuration=None, name=None):
ExecutableService.__init__(self, configuration=configuration, name=name)
self.order = ORDER
self.definitions = CHARTS
self.instance_name = configuration.get('instance_name')
self.parser = Parser()
self.command = None
def create_command(self):
varnishstat = find_binary(VARNISHSTAT)
if not varnishstat:
self.error("can't locate '{0}' binary or binary is not executable by user netdata".format(VARNISHSTAT))
return False
if self.instance_name:
self.command = [varnishstat, '-1', '-n', self.instance_name, '-t', '1']
else:
self.command = [varnishstat, '-1', '-t', '1']
return True
def check(self):
if not self.create_command():
return False
# STDOUT is not empty
reply = self._get_raw_data()
if not reply:
self.error("No output from 'varnishstat'. Is it running? Not enough privileges?")
return False
self.parser.init(reply)
# Output is parsable
if not self.parser.re_default:
self.error('Cant parse the output...')
return False
if self.parser.re_backend:
backends = [b[0] for b in self.parser.backend_stats(reply)[::2]]
self.create_backends_charts(backends)
return True
def get_data(self):
"""
Format data received from shell command
:return: dict
"""
raw = self._get_raw_data()
if not raw:
return None
data = dict()
server_stats = self.parser.server_stats(raw)
if not server_stats:
return None
if self.parser.re_backend:
backend_stats = self.parser.backend_stats(raw)
data.update(dict(('_'.join([name, param]), value) for name, param, value in backend_stats))
data.update(dict((param, value) for _, param, value in server_stats))
# varnish 5 uses default.g_bytes and default.g_space
data['memory_allocated'] = data.get('s0.g_bytes') or data.get('default.g_bytes')
data['memory_free'] = data.get('s0.g_space') or data.get('default.g_space')
return data
def create_backends_charts(self, backends):
for backend in backends:
chart_name = ''.join([backend, '_response_statistics'])
title = 'Backend "{0}"'.format(backend.capitalize())
hdr_bytes = ''.join([backend, '_beresp_hdrbytes'])
body_bytes = ''.join([backend, '_beresp_bodybytes'])
chart = {
chart_name:
{
'options': [None, title, 'kilobits/s', 'backend response statistics',
'varnish.backend', 'area'],
'lines': [
[hdr_bytes, 'header', 'incremental', 8, 1000],
[body_bytes, 'body', 'incremental', -8, 1000]
]
}
}
self.order.insert(0, chart_name)
self.definitions.update(chart)
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