Meas: separate the meas_json task

This allows more than one client to open the web meas

modules/rhizo_base/files/etc/sv/meas-json/log/run

@@ -0,0 +1,4 @@
+#!/bin/sh
+LOG_FOLDER=/var/log/meas-json
+mkdir -p $LOG_FOLDER
+exec svlogd -tt $LOG_FOLDER

modules/rhizo_base/files/etc/sv/meas-json/run

@@ -0,0 +1,4 @@
+#!/bin/bash
+exec 2>&1
+
+exec /usr/bin/stdbuf -oL /usr/bin/meas_json > /tmp/json_pipe

modules/rhizo_base/files/etc/sv/meas-web/run

@@ -1,3 +1,8 @@
-#!/bin/sh
+#!/bin/bash
 exec 2>&1
-exec /usr/bin/websocketd --staticdir=/var/www/meas --port=8080 /usr/bin/stdbuf -oL /usr/bin/meas_json
+
+if [ ! -p /tmp/json_pipe ] ; then
+  mkfifo /tmp/json_pipe
+fi
+
+exec /usr/bin/websocketd --staticdir=/var/www/meas --port=8080 cat /tmp/json_pipe

modules/rhizo_base/manifests/runit.pp

@@ -77,4 +77,10 @@ class rhizo_base::runit {
        require => [ File['/etc/sv'], Package['websocketd'] ],
     }
 
+  file { '/etc/service/meas-json':
+       ensure  => link,
+       target  => '/etc/sv/meas-json',
+       require => [ File['/etc/sv'] ],
+    }
+
   }