+ def get_interface_sw_index_from_json(interface_dump_json, interface_name):
+ """Get sw_if_index from given JSON output by interface name.
+
+ :param interface_dump_json: JSON output from dump_interface_list VAT
+ command.
+ :param interface_name: Interface name.
+ :type interface_dump_json: str
+ :type interface_name: str
+ :returns: SW interface index.
+ :rtype: int
+ :raises ValueError: If interface not found in interface_dump_json.
+ """
+ logger.trace(interface_dump_json)
+ interface_list = JsonParser().parse_data(interface_dump_json)
+ for interface in interface_list:
+ try:
+ if interface[u"interface_name"] == interface_name:
+ index = interface[u"sw_if_index"]
+ logger.debug(
+ f"Interface with name {interface_name} "
+ f"has sw_if_index {index}."
+ )
+ return index
+ except KeyError:
+ pass
+ raise ValueError(f"Interface with name {interface_name} not found.")
+
+ @staticmethod
+ def get_interface_name_from_json(interface_dump_json, sw_if_index):
+ """Get interface name from given JSON output by sw_if_index.
+
+ :param interface_dump_json: JSON output from dump_interface_list VAT
+ command.
+ :param sw_if_index: SW interface index.
+ :type interface_dump_json: str
+ :type sw_if_index: int
+ :returns: Interface name.
+ :rtype: str
+ :raises ValueError: If interface not found in interface_dump_json.
+ """
+ logger.trace(interface_dump_json)
+ interface_list = JsonParser().parse_data(interface_dump_json)
+ for interface in interface_list:
+ try:
+ if interface[u"sw_if_index"] == sw_if_index:
+ interface_name = interface[u"interface_name"]
+ logger.debug(
+ f"Interface with sw_if_index {sw_if_index} "
+ f"has name {interface_name}."
+ )
+ return interface_name
+ except KeyError:
+ pass
+ raise ValueError(f"Interface with sw_if_index {sw_if_index} not found.")
+
+ @staticmethod
+ def get_interface_mac_from_json(interface_dump_json, sw_if_index):
+ """Get interface MAC address from given JSON output by sw_if_index.
+
+ :param interface_dump_json: JSON output from dump_interface_list VAT
+ command.
+ :param sw_if_index: SW interface index.
+ :type interface_dump_json: str
+ :type sw_if_index: int
+ :returns: Interface MAC address.
+ :rtype: str
+ :raises ValueError: If interface not found in interface_dump_json.
+ """
+ logger.trace(interface_dump_json)
+ interface_list = JsonParser().parse_data(interface_dump_json)
+ for interface in interface_list:
+ try:
+ if interface[u"sw_if_index"] == sw_if_index:
+ mac_from_json = interface[u"l2_address"][:6] \
+ if u"l2_address" in list(interface.keys()) else u""
+ mac_address = u":".join(
+ f"{item:02x}" for item in mac_from_json
+ )
+ logger.debug(
+ f"Interface with sw_if_index {sw_if_index} "
+ f"has MAC address {mac_address}."
+ )
+ return mac_address
+ except KeyError:
+ pass
+ raise ValueError(f"Interface with sw_if_index {sw_if_index} not found.")
+
+ @staticmethod
+ def verify_vat_retval(vat_out, exp_retval=0, err_msg=u"VAT cmd failed"):