add statistics

git-svn-id: https://redmine.imt-atlantique.fr/svn/xaal/code/Python/trunk@1052 b32b6428-25c9-4566-ad07-03861ab6144f

devices/xaal-restapi/src/xaalrestapi/__main__.py

@@ -95,6 +95,7 @@ def run(filename='xaalrestapi',confDir=xAAL.config.CONF_DIR):
     apidevices = cherrypyrestapi.Devices(dbname)
     apisender = cherrypyrestapi.Sender(eng,dev)
     apinotifications = cherrypyrestapi.Notifications(dev)
+    apistatistics = cherrypyrestapi.Statistics(dbname)
 
     # To configure server and engine
     cherrypy.config.update({'environment': 'production',
@@ -116,6 +117,7 @@ def run(filename='xaalrestapi',confDir=xAAL.config.CONF_DIR):
     cherrypy.tree.mount(apidevices,'/api/xaal/devices',config=conf)
     cherrypy.tree.mount(apisender,'/api/xaal/send',config=conf)
     cherrypy.tree.mount(apinotifications,'/api/xaal/notifications',config=conf)
+    cherrypy.tree.mount(apistatistics,'/api/xaal/statistics',config=conf)
 
     cherrypy.engine.start()
     cherrypy.engine.block()

devices/xaal-restapi/src/xaalrestapi/cherrypyrestapi.py

@@ -124,3 +124,28 @@ class Notifications(object):
                     yield "event: attributesChange\n" + "data: " + str(data) + "\n\n"
         return stream()
     GET._cp_config = {'response.stream': True} 
+
+
+class Statistics(object):
+    """
+    Expose statistics related to the xAAL bus. i.e. number of devices, etc.
+    """
+    exposed = True 
+
+    def __init__(self,dbname):
+        self._dbname = dbname
+
+    def GET(self):
+        db=shelve.open(self._dbname)
+        devices=db['devices']
+        db.close()
+        
+        cherrypy.response.headers['Content-Type'] = "application/json"
+        cherrypy.response.headers['Access-Control-Allow-Origin'] = '*'        
+        
+        result={}
+        result['devices']=len(devices)
+        return ujson.dumps(result)
+
+
+