forked from TrueCloudLab/frostfs-node
[#762] write-cache: Implement Head operation
Write cache should be able to execute HEAD operations according to spec. Add simple implementation of `Head` method through the `Get` one. Leave notes for future optimization. Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
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@ -49,3 +49,20 @@ func (c *cache) Get(addr *objectSDK.Address) (*object.Object, error) {
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c.flushed.Get(saddr)
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return obj, nil
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}
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// Head returns object header from write-cache.
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func (c *cache) Head(addr *objectSDK.Address) (*object.Object, error) {
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// TODO: easiest to implement solution is presented here, consider more efficient way, e.g.:
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// - provide header as common object.Object to Put, but marked to prevent correlation with full object
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// (all write-cache logic will automatically spread to headers, except flushing)
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// - cut header from in-memory objects directly and persist headers into particular bucket of DB
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// (explicit sync with full objects is needed)
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// - try to pull out binary header from binary full object (not sure if it is possible)
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obj, err := c.Get(addr)
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if err != nil {
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return nil, err
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}
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// NOTE: resetting the payload via the setter can lead to data corruption of in-memory objects, but ok for others
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return object.NewRawFromObject(obj).CutPayload().Object(), nil
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}
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