basic script flow implemented

forwarders/stathat.sh

@@ -1,2 +0,0 @@
-#!/bin/sh
-# curl -d "stat=$METRIC&ezkey=$API_KEY&value=$VALUE" http://api.stathat.com/ez

metrics/cpu.sh

@@ -1,2 +1,5 @@
 #!/bin/sh
-echo $(ps aux | awk {'sum+=$3;print sum'} | tail -n 1)
+
+collect () {
+  echo $(ps aux | awk {'sum+=$3;print sum'} | tail -n 1)
+}

metrics/memory.sh

@@ -1,2 +1,5 @@
 #!/bin/sh
-echo $(free | awk '/buffers\/cache/{print $4/($3+$4) * 100.0;}')
+
+collect () {
+  echo $(free | awk '/buffers\/cache/{print $4/($3+$4) * 100.0;}')
+}

metrics/swap.sh

@@ -1,2 +1,5 @@
 #!/bin/sh
-echo $(free | awk '/Swap/{print $3/$2 * 100.0;}')
+
+collect () {
+  echo $(free | awk '/Swap/{print $3/$2 * 100.0;}')
+}

reporters/stathat.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+report () {
+  METRIC=$1
+  VALUE=$2
+  curl -d "stat=$METRIC&ezkey=$API_KEY&value=$VALUE" http://api.stathat.com/ez
+}

reporters/stdout.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+report () {
+  METRIC=$1
+  VALUE=$2
+  echo $METRIC: $VALUE
+}

sysmetricsd.sh

@@ -1,5 +1,43 @@
 #!/bin/sh
 
-for script in $(find ./metrics -type f -name '*.sh'); do
-  sh $script
+# config
+INTERVAL=2
+REPORTER=stdout
+
+# init
+source utils.sh
+_METRICS=()
+
+# load reporter
+source ./reporters/${REPORTER}.sh
+copy_function report _r_${REPORTER}_report
+unset -f report
+
+# load metrics
+for file in $(find ./metrics -type f -name '*.sh'); do
+  source $file
+  filename=$(basename $file)
+  metric=${filename%.*}
+  copy_function collect _m_${metric}_collect
+  _METRICS+=($metric)
+  unset -f collect
+  unset -f init
+done
+
+# init metrics
+for metric in ${_METRICS[@]}; do
+  [ "`type -t _m_${metric}_init`" != 'function' ] && continue
+  echo init metric "$metric"
+  _m_${metric}_init
+done
+
+# collect metrics
+while true; do
+  for metric in ${_METRICS[@]}; do
+    [ "`type -t _m_${metric}_collect`" != 'function' ] && continue
+    result=$(_m_${metric}_collect)
+    _r_${REPORTER}_report $metric $result
+  done
+
+  sleep $INTERVAL
 done

utils.sh

@@ -0,0 +1,5 @@
+# http://stackoverflow.com/a/1369211/183097
+copy_function () {
+  declare -F $1 > /dev/null || return 1
+  eval "$(echo "${2}()"; declare -f ${1} | tail -n +2)"
+}