add blocked protocol versions config setting

Author: joao-r-reis

ansible/templates/zdm_proxy_mutable_config_env_vars.j2

@@ -51,3 +51,7 @@ ZDM_REPLACE_CQL_FUNCTIONS={{ replace_cql_functions }}
 ZDM_FORWARD_CLIENT_CREDENTIALS_TO_ORIGIN={{ forward_client_credentials_to_origin }}
 {% endif %}
 
+{% if ( blocked_protocol_versions is defined ) %}
+ZDM_BLOCKED_PROTOCOL_VERSIONS={{ blocked_protocol_versions }}
+{% endif %}
+

ansible/templates/zdm_proxy_mutable_config_file.j2

@@ -56,3 +56,6 @@ replace_cql_functions: {{ replace_cql_functions }}
 forward_client_credentials_to_origin: {{ forward_client_credentials_to_origin }}
 {% endif %}
 
+{% if ( blocked_protocol_versions is defined ) %}
+blocked_protocol_versions: {{ blocked_protocol_versions }}
+{% endif %}

ansible/vars/zdm_proxy_advanced_config.yml

@@ -15,6 +15,17 @@
 ## Typically the same as the port on which the Origin cluster nodes listen for client connections.
 zdm_proxy_listen_port: 9042
 
+################################
+### Protocol Versions        ###
+################################
+
+## Comma-separated string that represents a list of protocol versions that should be blocked by the proxy.
+## Usually this is not necessary but could be useful if the application is having issues with certain protocol versions.
+## This can generally be done in the driver but configuring it at the proxy level can be easier in certain deployments.
+## Defaults to "" (no blocked version). Possible values at the moment are: v2,v3,v4,v5,DseV1 and DseV2. The values
+## are case insensitive and the "v" letter can be ommitted (e.g. 2,3,4,5,Dse1). Example: "v2,v5,DseV1"
+#blocked_protocol_versions:
+
 ################################
 ### CQL function replacement ###
 ################################