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Use single map and remove_all for EventTopics
#4566
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shawntabrizi
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shawntabrizi
commented
Jan 8, 2020
| /// no notification will be triggered thus the event might be lost. | ||
| EventTopics get(fn event_topics): double_map hasher(blake2_256) (), blake2_256(T::Hash) | ||
| => Vec<(T::BlockNumber, EventIndex)>; | ||
| EventTopics get(fn event_topics): map T::Hash => Vec<(T::BlockNumber, EventIndex)>; |
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We could reduce the complexity of the hasher used on the key here.
I don't quite understand if this is something worth changing.
bkchr
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Jan 8, 2020
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CC @jacogr |
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#2491 introduced light client friendly events.
It used a trick with the
double_mapapi where it was able to clear a single map by removing a single prefix of thedouble_map.See: paritytech/polkadot-sdk#371
Now that all storage items use
StoragePrefixedMap, we can now access theremove_allAPI directly from a single map.This updates the implementation of
EventTopicsto use a single map and theremove_allapi rather than thedouble_maphack.