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#!/bin/bash
# if this chart is called X.chart.sh, then all functions and global variables
# must start with X_
nginx_url="http://127.0.0.1:80/stub_status"
# _update_every is a special variable - it holds the number of seconds
# between the calls of the _update() function
nginx_update_every=
nginx_priority=60000
declare -a nginx_response=()
nginx_active_connections=0
nginx_accepts=0
nginx_handled=0
nginx_requests=0
nginx_reading=0
nginx_writing=0
nginx_waiting=0
nginx_get() {
nginx_response=($(curl -s "${nginx_url}"))
[ $? -ne 0 -o "${#nginx_response[@]}" -eq 0 ] && return 1
if [ "${nginx_response[0]}" != "Active" \
-o "${nginx_response[1]}" != "connections:" \
-o "${nginx_response[3]}" != "server" \
-o "${nginx_response[4]}" != "accepts" \
-o "${nginx_response[5]}" != "handled" \
-o "${nginx_response[6]}" != "requests" \
-o "${nginx_response[10]}" != "Reading:" \
-o "${nginx_response[12]}" != "Writing:" \
-o "${nginx_response[14]}" != "Waiting:" \
]
then
echo >&2 "nginx: Invalid response from nginx server: ${nginx_response[*]}"
return 1
fi
nginx_active_connections="${nginx_response[2]}"
nginx_accepts="${nginx_response[7]}"
nginx_handled="${nginx_response[8]}"
nginx_requests="${nginx_response[9]}"
nginx_reading="${nginx_response[11]}"
nginx_writing="${nginx_response[13]}"
nginx_waiting="${nginx_response[15]}"
if [ -z "${nginx_active_connections}" \
-o -z "${nginx_accepts}" \
-o -z "${nginx_handled}" \
-o -z "${nginx_requests}" \
-o -z "${nginx_reading}" \
-o -z "${nginx_writing}" \
-o -z "${nginx_waiting}" \
]
then
echo >&2 "nginx: empty values got from nginx server: ${nginx_response[*]}"
return 1
fi
return 0
}
# _check is called once, to find out if this chart should be enabled or not
nginx_check() {
nginx_get
if [ $? -ne 0 ]
then
echo >&2 "nginx: cannot find stub_status on URL '${nginx_url}'. Please set nginx_url='http://nginx.server/stub_status' in $confd/nginx.conf"
return 1
fi
# this should return:
# - 0 to enable the chart
# - 1 to disable the chart
return 0
}
# _create is called once, to create the charts
nginx_create() {
cat <<EOF
CHART nginx.connections '' "nginx Active Connections" "connections" nginx nginx.connections line $[nginx_priority + 1] $nginx_update_every
DIMENSION active '' absolute 1 1
CHART nginx.requests '' "nginx Requests" "requests/s" nginx nginx.requests line $[nginx_priority + 2] $nginx_update_every
DIMENSION requests '' incremental 1 1
CHART nginx.connections_status '' "nginx Active Connections by Status" "connections" nginx nginx.connections.status line $[nginx_priority + 3] $nginx_update_every
DIMENSION reading '' absolute 1 1
DIMENSION writing '' absolute 1 1
DIMENSION waiting idle absolute 1 1
CHART nginx.connect_rate '' "nginx Connections Rate" "connections/s" nginx nginx.connections.rate line $[nginx_priority + 4] $nginx_update_every
DIMENSION accepts accepted incremental 1 1
DIMENSION handled '' incremental 1 1
EOF
return 0
}
# _update is called continiously, to collect the values
nginx_update() {
# the first argument to this function is the microseconds since last update
# pass this parameter to the BEGIN statement (see bellow).
# do all the work to collect / calculate the values
# for each dimension
# remember: KEEP IT SIMPLE AND SHORT
nginx_get || return 1
# write the result of the work.
cat <<VALUESEOF
BEGIN nginx.connections $1
SET active = $[nginx_active_connections]
END
BEGIN nginx.requests $1
SET requests = $[nginx_requests]
END
BEGIN nginx.connections_status $1
SET reading = $[nginx_reading]
SET writing = $[nginx_writing]
SET waiting = $[nginx_waiting]
END
BEGIN nginx.connect_rate $1
SET accepts = $[nginx_accepts]
SET handled = $[nginx_handled]
END
VALUESEOF
return 0
}
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