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#!/bin/bash
# Description: Tomcat netdata charts.d plugin
# Author: Jorge Romero
# the URL to download tomcat status info
tomcat_url="http://localhost:8080/manager/status?XML=true"
# _update_every is a special variable - it holds the number of seconds
# between the calls of the _update() function
tomcat_update_every=
tomcat_priority=60000
# convert tomcat floating point values
# to integer using this multiplier
# this only affects precision - the values
# will be in the proper units
tomcat_decimal_detail=1000000
# used by volume chart to convert bytes to KB
tomcat_decimal_KB_detail=1000
tomcat_check() {
require_cmd xmlstarlet || return 1
tomcat_get
if [ $? -ne 0 ]
then
echo >&2 "tomcat: cannot find stub_status on URL '${tomcat_url}'. Please set tomcat_url='http://<user>:<password>@localhost:8080/manager/status?XML=true'"
return 1
fi
# this should return:
# - 0 to enable the chart
# - 1 to disable the chart
return 0
}
tomcat_get() {
# Collect tomcat values
mapfile -t lines < <(curl -Ss "$tomcat_url" |\
xmlstarlet sel \
-t -m "/status/jvm/memory" -v @free \
-n -m "/status/connector[@name='\"http-bio-8080\"']/threadInfo" -v @currentThreadCount \
-n -v @currentThreadsBusy \
-n -m "/status/connector[@name='\"http-bio-8080\"']/requestInfo" -v @requestCount \
-n -v @bytesSent -n -)
tomcat_jvm_freememory="${lines[0]}"
tomcat_threads="${lines[1]}"
tomcat_threads_busy="${lines[2]}"
tomcat_accesses="${lines[3]}"
tomcat_volume="${lines[4]}"
return 0
}
# _create is called once, to create the charts
tomcat_create() {
cat <<EOF
CHART tomcat.accesses '' "tomcat requests" "requests/s" statistics tomcat.accesses area $((tomcat_priority + 8)) $tomcat_update_every
DIMENSION accesses '' incremental
CHART tomcat.volume '' "tomcat volume" "KB/s" volume tomcat.volume area $((tomcat_priority + 5)) $tomcat_update_every
DIMENSION volume '' incremental divisor ${tomcat_decimal_KB_detail}
CHART tomcat.threads '' "tomcat threads" "current threads" statistics tomcat.threads line $((tomcat_priority + 6)) $tomcat_update_every
DIMENSION current '' absolute 1
DIMENSION busy '' absolute 1
CHART tomcat.jvm '' "JVM Free Memory" "MB" statistics tomcat.jvm area $((tomcat_priority + 8)) $tomcat_update_every
DIMENSION jvm '' absolute 1 ${tomcat_decimal_detail}
EOF
return 0
}
# _update is called continiously, to collect the values
tomcat_update() {
local reqs net
# 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
tomcat_get || return 1
# write the result of the work.
cat <<VALUESEOF
BEGIN tomcat.accesses $1
SET accesses = $((tomcat_accesses))
END
BEGIN tomcat.volume $1
SET volume = $((tomcat_volume))
END
BEGIN tomcat.threads $1
SET current = $((tomcat_threads))
SET busy = $((tomcat_threads_busy))
END
BEGIN tomcat.jvm $1
SET jvm = $((tomcat_jvm_freememory))
END
VALUESEOF
return 0
}
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