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fix: correctly close iterator in 07-tendermint #3022

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merged 3 commits into from
Jan 18, 2023
Merged

fix: correctly close iterator in 07-tendermint #3022

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140b79e
fix closing iterator in 07-tendermint
damiannolan Jan 17, 2023
7fd91fd
maintain defer pattern but use new variable to avoiid reassignment is…
damiannolan Jan 18, 2023
4aeada1
Merge branch 'main' into damian/fix-closing-iterator
damiannolan Jan 18, 2023
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3 changes: 2 additions & 1 deletion modules/light-clients/07-tendermint/store.go
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Original file line number Diff line number Diff line change
Expand Up @@ -80,7 +80,6 @@ func IterateConsensusMetadata(store sdk.KVStore, cb func(key, val []byte) bool)
iterator := sdk.KVStorePrefixIterator(store, []byte(host.KeyConsensusStatePrefix))

// iterate over processed time and processed height
defer iterator.Close()
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I think the defer pattern is still better to use, I worry that calling iterator.Close() could later be accidentally re-converted to a defer statement as it is typically more idiomatic. We can make defer version work in a few ways, either create a new variable to defer

e.g.

iter := iterator
defer iter.Close()

or use a new variable name below rather than re-assign. (I don't see any reason why we would need to re-assign below.)

WDYT?

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Nice suggestion, I agree sticking to the defer pattern is probably best. I've pushed an update using a new variable instead of reassignment.

for ; iterator.Valid(); iterator.Next() {
keySplit := strings.Split(string(iterator.Key()), "/")
// processed time key in prefix store has format: "consensusState/<height>/processedTime"
Expand All @@ -99,6 +98,8 @@ func IterateConsensusMetadata(store sdk.KVStore, cb func(key, val []byte) bool)
}
}

iterator.Close()

// iterate over iteration keys
iterator = sdk.KVStorePrefixIterator(store, []byte(KeyIterateConsensusStatePrefix))

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