Munin contributed plugins

#!/usr/bin/env python

# -*- coding: utf-8 -*-

# vim: set fileencoding=utf-8

#

# Munin plugin to monitor requests number, cache statuses, http status codes and average request times of

# specified nginx upstreams.

#

# Copyright Igor Borodikhin

#

# License : GPLv3

#

# Configuration parameters:

# env.graphs - which graphs to produce (optional, list of graphs separated by spaces, default - cache http time request)

# env.log - log file path (mandatory, ex.: /var/log/nginx/upstream.log)

# env.upstream - list of upstreams to monitor (mandatory, including port numbers separated by space, ex.: 10.0.0.1:80 10.0.0.2:8080)

# env.statuses - list of http status codes to monitor (optional, default - all statuses, ex.: 200 403 404 410 500 502)

# env.percentiles - which percentiles to draw on time graphs (optional, list of percentiles separated by spaces, default - 80)

#

# ## Installation

# Copy file to directory /usr/share/munin/pligins/ and create symbolic link(s) for each log file you wish to monitor.

#

# Specify log_format at /etc/nginx/conf.d/upstream.conf:

# log_format upstream "ua=[$upstream_addr] ut=[$upstream_response_time] us=[$upstream_status] cs=[$upstream_cache_status]"

#

# Use it in your site configuration (/etc/nginx/sites-enabled/anything.conf):

# access_log /var/log/nginx/upstream.log upstream;

#

# Attention! Because munin-node does not have read permission for nginx log files we need to run it as root.

#

# And specify some options in /etc/munin/plugin-conf.d/munin-node:

#

#     [nginx_upstream_multi_upstream]

#     user root

#     env.graphs cache http time request

#     env.log /var/log/nginx/upstream.log

#     env.upstream 10.0.0.1:80 10.0.0.2:8080 unix:/tmp/upstream3

#     env.statuses 200 403 404 410 500 502

#     env.percentiles 50 80

#

#%# family=contrib

import os, sys, re, copy, math

from time import time

# How we've been called

progName = sys.argv[0]

progName = progName[progName.rfind("/")+1:]

# Where to store plugin state

if "MUNIN_PLUGSTATE" in os.environ:

    stateDir = os.environ["MUNIN_PLUGSTATE"]

else:

    stateDir = None

# Which site configuration we should use

siteName = progName[len("nginx_upstream_multi_"):]

# Log path

if "log" in os.environ:

    logPath = os.environ["log"]

else:

    logPath = "/var/log/nginx/access.log"

# Http statuses list

httpStatusString = ("100:Continue;101:Switching protocols;102:Processing;200:OK;201:Created;202:Accepted;"

"203:Non-Authoritative Information;204:No content;205:Reset content;206:Partial content;207:Multi-status;"

"226:IM used;300:Multiple choices;301:Moved permanently;302:Moved temporarily;303:See other;304:Not modified;"

"305:Use proxy;307:Temporary redirect;400:Bad request;401:Unauthorized;402:Payment required;403:Forbidden;"

"404:Not found;405:Method not allowed;406:Not acceptable;407:Proxy Authentication Required;408:Request timeout;"

"409:Conflict;410:Gone;411:Length required;412:Precondition failed;413:Request entity too large;"

"414:Request URI too large;415:Usupported media type;416:Request range not satisfiable;417:Expectation failed;"

"422:Unprocessable entity;423:Locked;424:Failed dependency;425:Unordered collection;426:Upgrade required;"

"449:Retry with;456:Unrecoverable error;500:Internal server error;501:Not implemented;502:Bad gateway;"

"503:Service unavailable;504:Gateway timeout;505:HTTP version not supported;506:Variant also negotiates;"

"507:Insufficient storage;508:Loop detected;509:Bandwidth limit exceeded;510:Not extended")

if "statuses" in os.environ:

    statuses = os.environ["statuses"].split()

else:

    statuses = []

httpStatusList = {}

for statusString in httpStatusString.split(";"):

    [code, title] = statusString.split(":")

    if len(statuses) > 0 and code in statuses or len(statuses) == 0:

        httpStatusList[code] = {

            "title" : title,

            "requests" : 0

        }

cacheStatusList = { "MISS" : 0, "BYPASS" : 0, "EXPIRED" : 0, "UPDATING" : 0, "STALE" : 0, "HIT" : 0 }

# Parse upstreams

upstreams = {}

if "upstream" in os.environ:

    upstreamString = os.environ["upstream"]

    upstreamList = upstreamString.split()

    for upstream in upstreamList:

        upstreams[upstream] = {

            "requests" : 0,

            "time"     : 0,

            "times"    : [],

            "cache"    : copy.deepcopy(cacheStatusList),

            "http"     : copy.deepcopy(httpStatusList)

        }

else:

    raise Exception("No upstreams specified")

if "percentiles" in os.environ:

    percentiles = os.environ["percentiles"].split()

else:

    percentiles = [80]

if "graphs" in os.environ:

    graphs_enabled = os.environ["graphs"].split()

else:

    graphs_enabled = ["cache", "http", "time", "request"]

now = int(time())

lastBytePath = "%s/nginx_upstream_multi_%s_lastByte.txt" % (stateDir, siteName)

try:

    lastRun = os.path.getmtime(lastBytePath)

except OSError:

    lastRun = now

def sanitize(string):

    return string.replace(".", "_").replace(":", "_").replace("/", "_").replace("-", "_")

if len(sys.argv) == 2 and sys.argv[1] == "config":

    # Parent graph declaration

    print "multigraph nginx_upstream_multi_%s" % siteName.replace(".", "_")

    print "graph_title Requests number"

    print "graph_vlabel rps"

    print "graph_category webserver"

    for upstream in upstreams.keys():

        print "us%s_requests.label %s" % (sanitize(upstream), upstream)

    # Requests graph declaration

    if "request" in graphs_enabled:

        for upstream in upstreams.keys():

            print ""

            print "multigraph nginx_upstream_multi_%s.%s_requests" % (sanitize(siteName), sanitize(upstream))

            print "graph_title Requests number - %s" % upstream

            print "graph_vlabel rps"

            print "graph_category webserver"

            print "us%s_requests.label %s" % (sanitize(upstream), upstream)

            print ""

    # Times graph declaration

    if "time" in graphs_enabled:

        for upstream in upstreams.keys():

            print ""

            print "multigraph nginx_upstream_multi_%s.%s_times" % (sanitize(siteName), sanitize(upstream))

            print "graph_title Request time - %s" % upstream

            print "graph_vlabel sec."

            print "graph_category webserver"

            print "us%s_times.label average" % (sanitize(upstream))

            for percentile in percentiles:

                print "us%s_times_percentile_%s.label %s-percentile" % (sanitize(upstream), percentile, percentile)

            print ""

    # HTTP Status codes graph declaration

    if "http" in graphs_enabled:

        for upstream in upstreams.keys():

            print ""

            print "multigraph nginx_upstream_multi_%s.%s_statuses" % (sanitize(siteName), sanitize(upstream))

            print "graph_title HTTP - %s" % upstream

            print "graph_vlabel rps"

            print "graph_category webserver"

            keylist = httpStatusList.keys()

            keylist.sort()

            for status in keylist:

                print "http%s_%s_status.label %s - %s" % (status, sanitize(upstream), status, httpStatusList[status]["title"])

            print ""

    # Cache status graph declaration

    if "cache" in graphs_enabled:

        for upstream in upstreams.keys():

            print ""

            print "multigraph nginx_upstream_multi_%s.%s_cache" % (sanitize(siteName), sanitize(upstream))

            print "graph_title Cache - %s" % upstream

            print "graph_vlabel rps"

            print "graph_category webserver"

            for status in cacheStatusList:

                print "us%s_%s_cache.label %s" % (sanitize(status), sanitize(upstream), status)

            print ""

else:

    timeElapsed = now - lastRun

    lastByteHandle = None

    try:

        lastByteHandle = open(lastBytePath, "r")

        lastByte = int(lastByteHandle.read())

    except Exception:

        lastByte = 0

    if lastByteHandle != None:

        lastByteHandle.close()

    try:

        logHandle = open(logPath, "r")

    except Exception as e:

        print "Log file %s not readable: %s" % (logPath, e.strerror)

        sys.exit(1)

    try:

        logSize = int(os.path.getsize(logPath))

    except ValueError:

        logSize = 0

    if logSize < lastByte:

        lastByte = 0

    regExp = re.compile(r"ua=\[(.*?)\]\s+ut=\[(.*?)\]\s+us=\[(.*?)\]\s+cs=\[(.*?)\]")

    logHandle.seek(lastByte)

    for line in logHandle:

        match = regExp.search(line)

        if (match):

            # Extract data

            address = match.group(1)

            time    = match.group(2)

            status  = match.group(3)

            cache   = match.group(4)

            # Replace separators by space

            address = address.replace(",", " ")

            address = address.replace(" : ", " ")

            address = re.sub("\s+", " ", address)

            time    = time.replace(",", " ")

            time    = time.replace(" : ", " ")

            time    = re.sub("\s+", " ", time)

            status  = status.replace(",", " ")

            status  = status.replace(" : ", " ")

            status  = re.sub("\s+", " ", status)

            cache   = cache.replace(",", " ")

            cache   = cache.replace(" : ", " ")

            cache   = re.sub("\s+", " ", cache)

            addresses = address.split()

            times     = time.split()

            statuses  = status.split()

            caches    = cache.split()

            index = 0

            for uAddress in addresses:

                if uAddress in upstreams.keys():

                    try:

                        uTime    = float(times[index])

                    except ValueError:

                        uTime    = 0

                    if index < len(statuses):

                        uStatus  = statuses[index]

                    else:

                        uStatus = "-"

                    if index < len(caches):

                        uCache   = caches[index]

                    else:

                        uCache = "-"

                    if uAddress != "-":

                        upstreams[uAddress]["requests"]                  += 1

                    if uTime != "-":

                        upstreams[uAddress]["time"]                      += uTime

                        upstreams[uAddress]["times"].append(uTime)

                    if uStatus != "-" and uStatus in upstreams[uAddress]["http"].keys():

                        upstreams[uAddress]["http"][uStatus]["requests"] += 1

                    if uCache != "-":

                        upstreams[uAddress]["cache"][uCache]             += 1

                index += 1

    try:

        lastByteHandle = open(lastBytePath, "w")

        lastByteHandle.write(str(logHandle.tell()))

        lastByteHandle.close()

    except Exception as e:

        print e.strerror

        sys.exit(1)

    logHandle.close()

    # Parent graph data

    for upstream in upstreams.keys():

        value = 0

        if timeElapsed > 0:

            value = upstreams[upstream]["requests"] / timeElapsed

        print "us%s_requests.value %s" % (sanitize(upstream), value)

    # Requests graph data

    if "request" in graphs_enabled:

        for upstream in upstreams.keys():

            print ""

            print "multigraph nginx_upstream_multi_%s.%s_requests" % (sanitize(siteName), sanitize(upstream))

            value = 0

            if timeElapsed > 0:

                value = upstreams[upstream]["requests"] / timeElapsed

            print "us%s_requests.value %s" % (sanitize(upstream), value)

            print ""

    # Times graph data

    if "time" in graphs_enabled:

        for upstream in upstreams.keys():

            uTime = 0

            if upstreams[upstream]["requests"] > 0:

                uTime = upstreams[upstream]["time"] / upstreams[upstream]["requests"]

                upstreams[upstream]["times"].sort()

            print ""

            print "multigraph nginx_upstream_multi_%s.%s_times" % (sanitize(siteName), sanitize(upstream))

            print "us%s_times.value %s" % (sanitize(upstream), uTime)

            for percentile in percentiles:

                percentileValue = 0

                if upstreams[upstream]["requests"] > 0:

                    uTime = upstreams[upstream]["time"] / upstreams[upstream]["requests"]

                    percentileKey = int(percentile) * len(upstreams[upstream]["times"]) / 100

                    if len(upstreams[upstream]["times"])%2 > 0:

                        low = int(math.floor(percentileKey))

                        high = int(math.ceil(percentileKey))

                        percentileValue = (upstreams[upstream]["times"][low] + upstreams[upstream]["times"][high]) / 2

                    else:

                        percentileValue = upstreams[upstream]["times"][int(percentileKey)]

                print "us%s_times_percentile_%s.value %s" % (sanitize(upstream), percentile, percentileValue)

            print ""

    # HTTP Status codes graph data

    if "http" in graphs_enabled:

        for upstream in upstreams.keys():

            print ""

            print "multigraph nginx_upstream_multi_%s.%s_statuses" % (sanitize(siteName), sanitize(upstream))

            keylist = httpStatusList.keys()

            keylist.sort()

            for status in keylist:

                value = 0

                if timeElapsed > 0:

                    value = upstreams[upstream]["http"][status]["requests"] / timeElapsed

                print "http%s_%s_status.value %s" % (status, sanitize(upstream), value)

            print ""

    # Cache status graph data

    if "cache" in graphs_enabled:

        for upstream in upstreams.keys():

            print ""

            print "multigraph nginx_upstream_multi_%s.%s_cache" % (sanitize(siteName), sanitize(upstream))

            for status in cacheStatusList:

                value = 0

                if timeElapsed > 0:

                    value = upstreams[upstream]["cache"][status] / timeElapsed

                print "us%s_%s_cache.value %s" % (sanitize(status), sanitize(upstream), value)

            print ""