Upd/Generics have landed

[notimetoname]

Closes #2181. Blocked by #2342.

[codecov]

Codecov Report

Merging #2340 (a288668) into master (b282a8f) will increase coverage by 0.01%.
The diff coverage is 7.69%.

❗ Current head a288668 differs from pull request most recent head 3cdec55. Consider uploading reports for the commit 3cdec55 to get more accurate results

@@            Coverage Diff             @@
##           master    #2340      +/-   ##
==========================================
+ Coverage   29.87%   29.88%   +0.01%     
==========================================
  Files         398      398              
  Lines       29825    29806      -19     
==========================================
- Hits         8909     8907       -2     
+ Misses      20199    20182      -17     
  Partials      717      717              

Impacted Files	Coverage Δ
cmd/neofs-node/cache.go	0.00% <0.00%> (ø)
..._object_storage/blobstor/blobovniczatree/delete.go	65.07% <0.00%> (ø)
...cal_object_storage/blobstor/blobovniczatree/get.go	62.12% <0.00%> (ø)
pkg/morph/client/client.go	0.00% <ø> (ø)
pkg/morph/client/constructor.go	0.00% <0.00%> (ø)
pkg/morph/client/notary.go	0.00% <0.00%> (ø)
pkg/services/object_manager/placement/netmap.go	0.00% <0.00%> (ø)
pkg/services/policer/policer.go	0.00% <0.00%> (ø)
pkg/services/policer/process.go	0.00% <0.00%> (ø)
pkg/services/tree/cache.go	0.00% <0.00%> (ø)
... and 5 more

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[roman-khimov]

See #2319 for things to fix when dropping 1.17 support. There is #2181, but I'm not so immediately sure about that.

[roman-khimov]

Can we split it to #2319 and #2181 parts?

[notimetoname]

#2342 is done. Lets have generic fun.

[roman-khimov]

Can't say I'm impressed with the diffstat though (+137 −159), my expectations were somewhat higher. Something tells me we'll need to revise these caches anyway.

Please add #2181 fix/close somewhere.

[notimetoname]

Please add #2181 fix/close somewhere.

@roman-khimov, added to PR's description. It is 8 commits now, not sure which of them should have that link (or all?).

Can't say I'm impressed with the diffstat though (+137 −159), my expectations were somewhat higher.

In fact, mine was too. But i like that we do not have casts (ok, "assertions") in that code anymore, i find that parentheses dance (4+ in one expression) hard to read. Also, i would say that generics just do their work, and if it can be done with a small amount of code it should be done. In other words, i would say that our caches are too complex, so generics do not make them shorter where nothing relates to "generic code".

Anyway, i think, LRU caches will be updated to v2 somehow, so the issue says to update it, that PR updates it. Any other refactor should be considered in a separate way (can create an issue about that?).