implement disk_io metric on osx

README.md

@@ -0,0 +1,14 @@
+## TODO
+
+- [] README
+- [] option parsing
+- [] allow multiple reporters
+- [] implement log reporter
+- [] better docs, including reporters (--docs)
+- [] config file support
+- [] config file auto-generation
+- [] disk_io metric
+- [] load custom metrics
+- [] async metrics
+- [] extended metric labels?
+- [] same metric multiple times (e.g. disk_usage for multiple devices)

lib/utils/os.sh

@@ -13,3 +13,12 @@ is_osx ()     { [ $OS_TYPE == 'osx' ]; }
 is_linux ()   { [ $OS_TYPE == 'solaris' ]; }
 is_bsd ()     { [ $OS_TYPE == 'bsd']; }
 is_unknown () { [ $OS_TYPE == 'unknown' ]; }
+
+
+make_temp_dir () {
+  if is_osx; then
+    mktemp -d -t 'sysmetrics'
+  else
+    mktemp -d
+  fi
+}

metrics/disk_io.sh

@@ -1,31 +1,41 @@
-# #!/bin/sh
+#!/bin/sh
 
-# if [ -z $DISK_IO_MOUNTPOINT ]; then
-#   if is_osx; then
-#     DISK_IO_MOUNTPOINT="disk0"
-#   else
-#     DISK_IO_MOUNTPOINT="/dev/vda"
-#   fi
-# fi
+if [ -z $DISK_IO_MOUNTPOINT ]; then
+  if is_osx; then
+    DISK_IO_MOUNTPOINT="disk0"
+  else
+    DISK_IO_MOUNTPOINT="/dev/vda"
+  fi
+fi
 
-# if is_osx; then
-#   __disk_io_bgproc () {
-#     iostat -K -d -c 99999 -w $INTERVAL $DISK_IO_MOUNTPOINT | while read line; do
-#       echo $line | awk '{print $3}' > ./foobar
-#     done
-#   }
-# else
-#   __disk_io_bgproc () {
-#     echo $(iostat -y -d 1 $DISK_IO_MOUNTPOINT)
-#   }
-# fi
+if is_osx; then
+  __disk_io_bgproc () {
+    iostat -K -d -w $INTERVAL $DISK_IO_MOUNTPOINT | while read line; do
+      echo $line | awk '{print $3}' > $__disk_io_fifo
+    done
+  }
+else
+  __disk_io_bgproc () {
+    echo $(iostat -y -d 1 $DISK_IO_MOUNTPOINT)
+  }
+fi
 
-# init () {
-#   mkfifo ./foobar
-#   #exec 3<> ./foobar
-#   __disk_io_bgproc > ./foobar &
-# }
+__disk_io_fifo=$__TEMP_DIR/disk_io
 
-# collect () {
-#   cat ./foobar
-# }
+init () {
+  __disk_io_bgproc &
+  mkfifo $__disk_io_fifo
+}
+
+collect () {
+  report $(cat $__disk_io_fifo)
+}
+
+terminate () {
+  rm $__disk_io_fifo
+}
+
+docs () {
+  echo "Disk I/O in MB/s."
+  echo "\$DISK_IO_MOUNTPOINT=$DISK_IO_MOUNTPOINT"
+}

sysmetricsd.sh

@@ -4,12 +4,24 @@
 INTERVAL=1
 REPORTER=stdout
 
-#init
-__METRICS=()
-
 # load utils
 for util in ./lib/utils/*.sh; do source $util; done
 
+# init
+__METRICS=()
+__TEMP_DIR=$(make_temp_dir)
+
+# register trap
+trap '
+  for metric in ${__METRICS[@]}; do
+    if ! is_function __m_${metric}_terminate; then
+      continue
+    fi
+    __m_${metric}_terminate
+  done
+  trap - SIGTERM && kill -- -$$ SIGINT SIGTERM EXIT
+' SIGINT SIGTERM EXIT
+
 # load reporter
 source ./reporters/${REPORTER}.sh
 copy_function init      __r_${REPORTER}_init
@@ -80,6 +92,3 @@ while true; do
 
   sleep $INTERVAL
 done
-
-# trap 'kill $(jobs -pr)' SIGINT SIGTERM EXIT
-# trap "trap - SIGTERM && kill -- -$$" SIGINT SIGTERM EXIT