From: Ole Artz <ole.artz@t-online.de>
Date: Fri, 11 Aug 2017 13:06:37 +0000 (+0200)
Subject: DASH: Use Thread() to fetch values in background
X-Git-Url: https://jspc29.x-matter.uni-frankfurt.de/git/?a=commitdiff_plain;h=257c364ef0bbc58d56d8a78e68921d015bf71282;p=mvd_epics.git

DASH: Use Thread() to fetch values in background
---

diff --git a/python_suite/dashboard/dashboard.py b/python_suite/dashboard/dashboard.py
index 6063d6b..38d9837 100755
--- a/python_suite/dashboard/dashboard.py
+++ b/python_suite/dashboard/dashboard.py
@@ -1,18 +1,19 @@
 #!/usr/bin/env python
 
-import json
+import json, threading
 import epics
 
 from bottle import route, run, static_file
 from bottle import jinja2_view as view
 
 CONFIG = None
+PVS = {}
 
 def update_values():
     global CONFIG
     for group in CONFIG['groups']:
         for pv in group['PVs']:
-            p = epics.PV(pv['name'])
+            p = PVS[pv['name']]
             p.get_ctrlvars()
             class_map = {
               epics.NO_ALARM :      "",
@@ -23,22 +24,25 @@ def update_values():
             }
             pv['classes'] = class_map[p.severity]
             if 'enum' in p.type:
-                pv['value'] = p.get(as_string=True)
+                pv['value'] = p.char_value
             else:
-                pv['value'] = p.get()
+                pv['value'] = p.value
             if pv['value'] is None: pv['value'] = '- disconnected -'
             pv['unit'] = p.units or ''
             if pv['value'] == 'OFF': pv['value'] = '- OFF -'
             if pv['value'] == 'ON': pv['value'] = '- ON -'
+
+def update_values_continuous():
+    while True:
+        update_values()
+
 @route('/')
 @view('pv_overview.jinja2')
 def index():
-    update_values()
     return CONFIG
 
 @route('/api/values.json')
 def index():
-    update_values()
     return CONFIG
 
 @route('/static/<path:path>')
@@ -46,7 +50,7 @@ def static_content(path):
     return static_file(path, root='./static/')
 
 def main():
-    global CONFIG
+    global CONFIG, PVS
 
     import argparse, sys
     parser = argparse.ArgumentParser()
@@ -68,6 +72,17 @@ def main():
             sys.stderr.write(str(e) + "\n")
             sys.exit(1)
 
+    for group in CONFIG['groups']:
+        for pv in group['PVs']:
+            PVS[pv['name']] = epics.PV(pv['name'], auto_monitor=True)
+            pv['value'] = 'Undefined'
+            pv['unit'] = ''
+            pv['classes'] = ''
+
+    uvt = threading.Thread(target=update_values_continuous)
+    uvt.daemon = True
+    uvt.start()
+
     run(host=args.host, port=args.port, debug=args.debug)
 
 if __name__ == "__main__": main()