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Enum ( * [( stat . upper (), stat ) for stat in dir_stats ]) # relay descriptors must have exactly one of the following REQUIRED_FIELDS = ( 'extra-info' , 'published' , 'router-signature' , ) # optional entries that can appear at most once SINGLE_FIELDS = ( 'read-history' , 'write-history' , 'geoip-db-digest' , 'geoip6-db-digest' , 'bridge-stats-end' , 'bridge-ips' , 'dirreq-stats-end' , 'dirreq-v2-ips' , 'dirreq-v3-ips' , 'dirreq-v2-reqs' ,...