implement parallel collecting. add keen_io reporter. several fixes

reporters/keen_io.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+init() {
+  if [ -z $KEEN_IO_PROJECT_ID ]; then
+    echo "Error: keen_io requires \$KEEN_IO_PROJECT_ID to be set"
+    exit 1
+  fi
+
+  if [ -z $KEEN_IO_WRITE_KEY ]; then
+    echo "Error: keen_io requires \$KEEN_IO_WRITE_KEY to be set"
+    exit 1
+  fi
+
+  if [ -z $KEEN_IO_EVENT_COLLECTION ]; then
+    KEEN_IO_EVENT_COLLECTION=$HOSTNAME
+  fi
+
+  __keen_io_api_url="https://api.keen.io/3.0"
+  __keen_io_api_url+="/projects/$KEEN_IO_PROJECT_ID"
+  __keen_io_api_url+="/events/$KEEN_IO_EVENT_COLLECTION"
+  __keen_io_api_url+="?api_key=$KEEN_IO_WRITE_KEY"
+}
+
+report () {
+  METRIC=$1
+  VALUE=$2
+  curl -s $__keen_io_api_url -H "Content-Type: application/json" \
+                  -d "{\"metric\": \"$METRIC\", \"value\": $VALUE}" > /dev/null
+}
+
+docs () {
+  echo "Send data to Keen IO (https://keen.io)."
+  echo "\$KEEN_IO_WRITE_KEY=<write_key>"
+  echo "\$KEEN_IO_PROJECT_ID=<project_id>"
+  echo "\$KEEN_IO_EVENT_COLLECTION=$KEEN_IO_EVENT_COLLECTION"
+}

reporters/stathat.sh

@@ -1,12 +1,20 @@
 #!/bin/sh
 
+init () {
+  if [ -z $STATHAT_API_KEY ]; then
+    echo "Error: stathat requires \$STATHAT_API_KEY to be set"
+    exit 1
+  fi
+}
+
 report () {
   METRIC=$1
   VALUE=$2
-  curl -d "stat=$METRIC&ezkey=$STATHAT_API_KEY&value=$VALUE" http://api.stathat.com/ez
+  curl -s -d "stat=$METRIC&ezkey=$STATHAT_API_KEY&value=$VALUE" \
+                                      http://api.stathat.com/ez > /dev/null
 }
 
 docs () {
   echo "Send data to StatHat (https://www.stathat.com)."
-  echo "\$API_KEY=<ez_key>"
+  echo "\$STATHAT_API_KEY=<ez_key>"
 }