provider: schedule prefix length #1116
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gammazero
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gammazero
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* provider: adding provide and reprovide queue * provider: network operations * add some tests * schedule prefix len computations * addressed review * use go-test/random * satisfy linter * log errors during initial prefix len measurement * close avgPrefixLenReady to signal initialPrefixLen measurement is done
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* provider: adding provide and reprovide queue * provider: network operations * add some tests * schedule prefix len computations * addressed review * use go-test/random * satisfy linter * log errors during initial prefix len measurement * close avgPrefixLenReady to signal initialPrefixLen measurement is done
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* provider: adding provide and reprovide queue * provider: network operations * add some tests * schedule prefix len computations * addressed review * use go-test/random * satisfy linter * log errors during initial prefix len measurement * close avgPrefixLenReady to signal initialPrefixLen measurement is done
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* provider: adding provide and reprovide queue * provider: network operations * add some tests * schedule prefix len computations * addressed review * use go-test/random * satisfy linter * log errors during initial prefix len measurement * close avgPrefixLenReady to signal initialPrefixLen measurement is done
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Part of #1095
Depends on #1115
The provider schedule (introduced in follow up PR) stores a mapping
prefix -> timestamp, corresponding to the time at which a keyspace region represented by its prefix should be reprovided. When reproviding a region, all keys matching the region's prefix will be reprovided.Whenever users want to provide a key with
StartProviding, if no prefix of the key is in the schedule yet, we take a prefix of the key whose length is the average of the prefixes already in the schedule (assume the keyspace region has the same peers population density as the average population density in teh DHT swarm).When the schedule is empty, we make a couple
GetClosestPeersrequests in order to have an approximation of the network size, helping to determine the initial prefix length to be used in the schedule.Note that no network provide can happen before
measureInitialPrefixLenhas completed.measureInitialPrefixLenwill block untilGetClosestPeersreturn some peers, so it requires the node to have a connection, and therouter(DHT client) to be bootstrapped. Anyway, if the DHT client isn't bootstrapped, no provide operation can succeed.providerafter provider: network operations #1115 is merged