haproxy_status: add help on -h

check_haproxy_status

@@ -16,43 +16,24 @@
 # 2020-12-03  v1.4  <axel.hahn@iml.unibe.ch>  added support of multiple front- and backends
 # 2021-12-14  v1.5  <axel.hahn@iml.unibe.ch>  use updated haproxy paser in sourced file
 # 2022-04-01  v1.6  <axel.hahn@iml.unibe.ch>  use wget default params; shell fixes
-# 2022-10-21  v1.7  <axel.hahn@unibe.ch>     remove grep: warning: stray \ before white space
+# 2022-10-21  v1.7  <axel.hahn@unibe.ch>      remove grep: warning: stray \ before white space
+# 2023-07-28  v1.8  <axel.hahn@unibe.ch>      add help page
 # ======================================================================
 
 . $(dirname $0)/inc_pluginfunctions
-. $(dirname $0)/inc_haproxy_cfg.sh
 
-cfgfile=/etc/haproxy/haproxy.cfg
+export self_APPVERSION=1.8
+
+. $(dirname $0)/inc_haproxy_cfg.sh
 
 tmpfile=/tmp/check_haproxy_status_$$
 tmpfile2=/tmp/check_haproxy_status2_$$
 tmpfileping=/tmp/check_haproxy_status3_$$
 
-# ----------------------------------------------------------------------
-# pre checks
-# ----------------------------------------------------------------------
-ph.require wget
-
-if [ ! -f $cfgfile ]; then
-  ph.abort "UNKNOWN: config file does not exist: $cfgfile"
-fi
-
-cat $cfgfile >/dev/null
-if [ $? -ne 0 ]; then
-  ph.abort "UNKNOWN: unable to read ha proxy config $cfgfile ... `ls -l $cfgfile`"
-fi
-
-cat $cfgfile | grep " mode .*http" >/dev/null
-if [ $? -ne 0 ]; then
-  ph.abort "UNKNOWN: haproxy is not in http mode"
-fi
-
-
 # ----------------------------------------------------------------------
 # functions
 # ----------------------------------------------------------------------
 
-
 # find a column number of a given field name in haproxy csv
 function getColnumber(){
   cat $tmpfile | head -1 | sed 's#,#\n#g' | grep -n "^$1$" | cut -f 1 -d ':'
@@ -60,9 +41,9 @@ function getColnumber(){
 
 # get stats data from column [name]
 function getColumn(){
-  typeset -i local _iNumber=$1
+  typeset -i _iNumber=$1
   local _filter=$2
-  test -z $_filter && _filter='.*'
+  test -z "$_filter" && _filter='.*'
   grep "$_filter" $tmpfile | grep -v "stats_frontend" | cut -f 2,$_iNumber -d ','
 }
 
@@ -84,6 +65,72 @@ function checkStatus(){
     echo ERROR
   fi
 }
+
+# show help
+function showHelp(){
+    local _self; _self=$(basename $0)
+cat <<EOF
+$( ph.showImlHelpHeader )
+
+Check HA Proxy statistics on frontend and backend.
+It shows if the status is OPEN or UP and show counts of current connectons.
+
+The plugin reads $HAPROXYcfgfile to detect the required statistics url and get
+csv data.
+It requires wget to handle the http request.
+
+Non OK values occur:
+  UNKNOWN - if $HAPROXYcfgfile cannot be read
+          - haproxy is not in http mode
+          - the url wasn't detected
+          - the detected status url doesn't send a response
+  ERROR - a frontend status is not OPEN
+        - a backend status is not UP
+
+The plugin sends performance data.
+
+SYNTAX:
+$_self [-h]
+
+OPTIONS:
+
+    -h or --help   show this help.
+
+EXAMPLE:
+
+    $_self
+
+EOF
+}
+
+# ----------------------------------------------------------------------
+# MAIN
+# ----------------------------------------------------------------------
+
+# --- check param -h
+case "$1" in
+    "--help"|"-h")
+        showHelp
+        exit 0
+        ;;
+    *)
+esac
+
+ph.require wget
+
+if [ ! -f $HAPROXYcfgfile ]; then
+  ph.abort "UNKNOWN: config file does not exist: $HAPROXYcfgfile"
+fi
+
+if ! cat $HAPROXYcfgfile >/dev/null; then
+  ph.abort "UNKNOWN: unable to read ha proxy config $HAPROXYcfgfile ... $(ls -l $HAPROXYcfgfile)"
+fi
+
+if ! cat $HAPROXYcfgfile | grep " mode .*http" >/dev/null; then
+  ph.abort "UNKNOWN: haproxy is not in http mode"
+fi
+
+
 # ----------------------------------------------------------------------
 # build url
 # ----------------------------------------------------------------------
@@ -102,7 +149,6 @@ urlmasked=$( echo $url | sed "s#\(://\)\(.*@\)#\1#g" )
 # check output
 # ----------------------------------------------------------------------
 
-
 # --- get status page
 wget -T 5 -t 1 --no-check-certificate -O $tmpfile $url 2>/dev/null
 if [ $? -ne 0 ]; then
@@ -145,8 +191,6 @@ ph.status "FRONT: $statusFront - ${iFrontend} (max: ${iMaxConnFront}) .. BACK: $
 test -z "$statusExt" || echo "${statusExt}"
 # echo; echo DEBUG: ; cat $tmpfile
 
-
-
 ph.perfadd "frontend"      "${iFrontend}"
 ph.perfadd "frontend-max"  "${iMaxConnFront}"
 ph.perfadd "frontend-free" "${iFrontendFree}"
@@ -162,11 +206,11 @@ ph.perfadd "backend-free"  "${iBackendFree}"
 getColumn $colCurrentConnections | sed -n "2,$ p" >$tmpfile2
 while read line
 do
-        srv=$(echo $line  | cut -f 1 -d ",")
-        val=$(echo $line  | cut -f 2 -d ",")
-        label=$(echo $srv | tr [:upper:] [:lower:])
+  srv=$(echo $line  | cut -f 1 -d ",")
+  val=$(echo $line  | cut -f 2 -d ",")
+  # label=$(echo $srv | tr [:upper:] [:lower:])
 
-        # echo "${srv} - ${val}"
+  # echo "${srv} - ${val}"
   echo -n "${srv} - ${val} "
 
   # v1.3: if it is a servername then ping to it