Split off from https://trac.torproject.org/projects/tor/ticket/23094#comment:9 Replying to [legacy/trac#23094:comment:3 asn]: > After our legacy/trac#23387 refactoring of hsdir index logic Nick suggested that we don't need to keep all 3 around in memory, since two of them are always identical: > https://oniongit.eu/asn/tor/merge_requests/6#note_1201 We need to: * analyse the state machine of fetch, store_first, and store_second to make sure that fetch is always equal to store_first or store_second * work out the condition that we can use to select betweeen store_first or store_second when we want fetch * write a function that produces fetch from a hsdir_index_t, and use it instead of fetch