structured main routines. implement file reporter

lib/main.sh

@@ -0,0 +1,108 @@
+# load utils
+for util in ./lib/utils/*.sh; do source $util; done
+
+# init
+__METRICS=()
+__TEMP_DIR=$(make_temp_dir)
+
+# load reporter
+
+main_load () {
+  source ./reporters/${REPORTER}.sh
+  copy_function init      __r_${REPORTER}_init
+  copy_function report    __r_${REPORTER}_report
+  copy_function terminate __r_${REPORTER}_terminate
+  copy_function docs      __r_${REPORTER}_docs
+  unset -f init report terminate docs
+
+  # load metrics
+  for file in ./metrics/*.sh; do
+    filename=$(basename $file)
+    metric=${filename%.*}
+
+    # soruce file and copy functions
+    source $file
+    copy_function init      __m_${metric}_init
+    copy_function collect   __m_${metric}_collect
+    copy_function terminate __m_${metric}_terminate
+    copy_function docs      __m_${metric}_docs
+    unset -f init collect terminate docs
+
+    # register metric
+    __METRICS+=($metric)
+  done
+}
+
+main_init () {
+  # init reporter
+  if is_function __r_${REPORTER}_init; then
+    __r_${REPORTER}_init
+  fi
+
+  # init metrics
+  for metric in ${__METRICS[@]}; do
+    if ! is_function __m_${metric}_init; then
+      continue
+    fi
+
+    __m_${metric}_init
+  done
+}
+
+main_docs () {
+  echo "Available metrics:"
+  for metric in ${__METRICS[@]}; do
+    if ! is_function __m_${metric}_docs; then
+      continue
+    fi
+
+    echo "[$metric]"
+    __m_${metric}_docs
+    echo
+  done
+}
+
+main_collect () {
+  # used by metrics to return results
+  report () {
+    local _r_result
+    if [ -z $2 ]; then
+      _r_label=$metric
+      _r_result="$1"
+    else
+      _r_label="$metric.$1"
+      _r_result="$2"
+    fi
+    if is_number $_r_result; then
+      __r_${REPORTER}_report $_r_label $_r_result
+    fi
+  }
+
+  # collect metrics
+  while true; do
+    for metric in ${__METRICS[@]}; do
+      if ! is_function __m_${metric}_collect; then
+        continue
+      fi
+
+      __m_${metric}_collect
+    done
+
+    sleep $INTERVAL
+  done
+}
+
+main_terminate () {
+  # terminate metrics
+  for metric in ${__METRICS[@]}; do
+    if ! is_function __m_${metric}_terminate; then
+      continue
+    fi
+    __m_${metric}_terminate
+  done
+
+  # terminate reporter
+  if is_function __r_${REPORTER}_terminate; then
+    __r_${REPORTER}_terminate
+  fi
+}

lib/utils/helpers.sh

@@ -0,0 +1,7 @@
+is_number () {
+  [ ! -z "$1" ] && printf '%f' "$1" &>/dev/null
+}
+
+iso_date () {
+  date -u +"%Y-%m-%dT%H:%M:%SZ"
+}

lib/utils/os.sh

@@ -14,11 +14,13 @@ is_linux ()   { [ $OS_TYPE == 'solaris' ]; }
 is_bsd ()     { [ $OS_TYPE == 'bsd']; }
 is_unknown () { [ $OS_TYPE == 'unknown' ]; }
 
-
-make_temp_dir () {
-  if is_osx; then
+# http://unix.stackexchange.com/a/84980/50905
+if is_osx; then
+  make_temp_dir () {
     mktemp -d -t 'sysmetrics'
-  else
+  }
+else
+  make_temp_dir () {
     mktemp -d
-  fi
-}
+  }
+fi