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[#1996] engine: Always select proper shard for a tree

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Currently there is a possibility for modifying operations to fail
because of I/O errors and a new tree to be created on another shard.
This commit adds existence check for modifying operations.
Read operations remain as they are, not to slow things.
`TreeDrop` is an exception, because this is a tree removal and trying
multiple shards is not an unwanted behaviour.

Signed-off-by: Evgenii Stratonikov <evgeniy@morphbits.ru>
This commit is contained in:
Evgenii Stratonikov 2022-10-06 19:06:19 +03:00 • committed by fyrchik
parent 08efe6eb11
commit d8d3588e1b
7 changed files with 128 additions and 38 deletions
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8
pkg/local_object_storage/shard/tree.go
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@ -91,3 +91,11 @@ func (s *Shard) TreeList(cid cidSDK.ID) ([]string, error) {
}
return s.pilorama.TreeList(cid)
}
// TreeExists implements the pilorama.Forest interface.
func (s *Shard) TreeExists(cid cidSDK.ID, treeID string) (bool, error) {
if s.pilorama == nil {
return false, ErrPiloramaDisabled
}
return s.pilorama.TreeExists(cid, treeID)
}