self.device = device
self.shared = shared
# RX and TX counters for this interface
+ # A None value can be set to mean that the data is not available
self.tx = 0
self.rx = 0
+ # This is a special field to hold an optional total rx count that is only
+ # used for column aggregation to compute a total intertface stats
+ # Set to non zero to be picked by the add interface stats method for rx total
+ self.rx_total = None
def get_packet_count(self, direction):
"""Get packet count for given direction.
def add_if_stats(self, if_stats):
"""Add another ifstats to this instance."""
- self.tx += if_stats.tx
- self.rx += if_stats.rx
+ def added_counter(old_value, new_value_to_add):
+ if new_value_to_add:
+ if old_value is None:
+ return new_value_to_add
+ return old_value + new_value_to_add
+ return old_value
+
+ self.tx = added_counter(self.tx, if_stats.tx)
+ self.rx = added_counter(self.rx, if_stats.rx)
+ # Add special rx total value if set
+ self.rx = added_counter(self.rx, if_stats.rx_total)
def update_stats(self, tx, rx, diff):
"""Update stats for this interface.