Set and get based on HTTP method.

bt5/erp5_opcua/SkinTemplateItem/portal_skins/erp5_opcua/ERP5Site_handleOPCUARequest.py

 """
-Simple script for OPCUA POC
+OPCUA to ERP5 OPCUA Document setter / getter glue script.
+
+XXX:
+  - get rid of Proxy roles on this script when proper authentication is used!!!
+  - use username / password for opcua-http-gw
+
 """
 import json
 from erp5.component.module.Log import log
 
-# XXX: get rid of Proxy roles on this script when proper authentication is used!!!
-
 def convertNodeValue(node_id, node_value):
   """
   Based on node_id convert to proper Python type. Based on this format:
@@ -20,25 +23,31 @@ def convertNodeValue(node_id, node_value):
     node_value = int(node_value)
   return node_value
 
-
 # XXX: what should be the OPCUA container?
 default_opcua_document = context.opcua_document_module["1"]
 
-try:
-  data = context.REQUEST.data
-except AttributeError:
-  log("Warning: 'data' is missing from request.")
-else:
-  data = json.loads(data)
-  if 'node' in data.keys():
-    # log only set requests for now
-    node_id = data['node']
-    node_value = data['val']
-    log("Set '%s' =  '%s' to %s as %s" %(node_id, node_value, default_opcua_document, node_id))
-    #log(data)
-    # set to  "ERP5 OPCUA Document"
-    node_dict = default_opcua_document.getNodeDict()
-    log("Original = %s" %node_dict)
-    node_dict[node_id] = convertNodeValue(node_id, node_value)
-    default_opcua_document.setNodeDict(node_dict)
-    log("Changed = %s" %default_opcua_document.getNodeDict())
+# do selection of oepration in a REST fashion based in HTTP method
+http_method = context.REQUEST.method
+context.log(http_method)
+
+if http_method == "GET":
+  # assume read request, return  what was saved.
+  return default_opcua_document.getNodeDict()
+elif http_method == "POST":
+  # assume write request
+  try:
+    data = context.REQUEST.data
+  except AttributeError:
+    log("Warning: 'data' is missing from request.")
+  else:
+    data = json.loads(data)
+    if 'node' in data.keys():
+      # log only set requests for now
+      node_id = data['node']
+      node_value = data['val']
+      log("Set '%s' =  '%s' to %s as %s" %(node_id, node_value, default_opcua_document, node_id))
+      # set to  "ERP5 OPCUA Document"
+      node_dict = default_opcua_document.getNodeDict()
+      node_dict[node_id] = convertNodeValue(node_id, node_value)
+      default_opcua_document.setNodeDict(node_dict)
+      log("Changed = %s" %default_opcua_document.getNodeDict())