Add master query endpoint

New /master endpoint serving the name of the
Salt master for the specified machine.

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

roleproxy.py

@@ -43,8 +43,16 @@ def get_roles(netbox, name):
     if len(vm) == 0:
         return(404, None)
 
+def get_master(netbox, name):
+    vm = netbox.virtualization.virtual_machines.filter(name=name)
+    if len(vm) > 0:
+        vmmaster = vm[0].config_context.salt_master
+        return(200, vmmaster)
+    if len(vm) == 0:
+        return(404, None)
+
 @app.route('/roles')
-def query():
+def query_roles():
     name = flask.request.args.get('machine')
     query = get_roles(connect(host, token), name)
     response = query[0]
@@ -55,6 +63,17 @@ def query():
         roledict = {'roles': query[1]}
     return(flask.jsonify(roledict))
 
+@app.route('/master')
+def query_master():
+    name = flask.request.args.get('machine')
+    query = get_master(connect(host, token), name)
+    response = query[0]
+    logger.info(' %s requested master for %s and received %i', flask.request.remote_addr, name, response)
+    if response == 404:
+        flask.abort(404)
+    elif response == 200:
+        return(query[1])
+
 if __name__ == '__main__':
     #app.run(debug=False)
     logger = logging.getLogger('roleproxy')