services/object: use stream API for Get operation

[End-rey]

Closes #3439.

[codecov]

Codecov Report

❌ Patch coverage is 44.93671% with 87 lines in your changes missing coverage. Please review.
✅ Project coverage is 25.70%. Comparing base (adf5444) to head (16adc2d).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/services/object/get/util.go	14.58%	41 Missing ⚠️
pkg/services/object/get/assembly_v2.go	0.00%	30 Missing ⚠️
pkg/services/object/get/exec.go	73.68%	6 Missing and 4 partials ⚠️
pkg/services/object/get/assemble.go	83.78%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3466      +/-   ##
==========================================
+ Coverage   25.66%   25.70%   +0.03%     
==========================================
  Files         659      659              
  Lines       49373    49399      +26     
==========================================
+ Hits        12673    12698      +25     
+ Misses      35694    35691       -3     
- Partials     1006     1010       +4     

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[cthulhu-rider]

viewed partially, lets discuss these ones first

[cthulhu-rider]

looks good overall

pls try to make more ergonomic diff in initFromChild, currently it has many unrelated changes

[cthulhu-rider]

@End-rey good!

lets cmp performance of 64K and 256K buffers. If there is no growth or it is insignificant, it makes sense to leave 64

and conflicts ofc

[End-rey]

@cthulhu-rider I think the last changes is assemble V1 split, which almost does not change the logic. And resolve conflicts in util.go.

[cthulhu-rider]

tests fail

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xecbba3]

goroutine 302 [running]:
github.com/nspcc-dev/neofs-node/pkg/services/object/get.(*execCtx).writeObjectPayload(0xc000f9a360, 0x8?, {0x14d2490?, 0xc000046cb0})
	github.com/nspcc-dev/neofs-node/pkg/services/object/get/exec.go:334 +0xa3
github.com/nspcc-dev/neofs-node/pkg/services/object/get.(*execCtx).writeCollectedObject(0xc000f9a360)
	github.com/nspcc-dev/neofs-node/pkg/services/object/get/exec.go:377 +0x3b
github.com/nspcc-dev/neofs-node/pkg/services/object/get.(*execCtx).executeLocal(0xc000f9a360)
	github.com/nspcc-dev/neofs-node/pkg/services/object/get/local.go:29 +0xfb
github.com/nspcc-dev/neofs-node/pkg/services/object/get.(*execCtx).execute(0xc000f9a360)
	github.com/nspcc-dev/neofs-node/pkg/services/object/get/get.go:101 +0x3f
github.com/nspcc-dev/neofs-node/pkg/services/object/get.(*Service).get(0xc000282588, {0x14d9ed0, 0xc0004fa7b0}, {{0x14d10e8, 0xc00051cd50}, 0xc0004ba300, {{0xe8, 0x60, 0xda, 0xd3, ...}, ...}, ...}, ...)
	github.com/nspcc-dev/neofs-node/pkg/services/object/get/get.go:92 +0x165
github.com/nspcc-dev/neofs-node/pkg/services/object/get.(*Service).getRange(0xc000282588, {0x14d9ed0, 0xc0004fa7b0}, {{{0x14d10e8, 0xc00051cd50}, 0xc0004ba300, {{0xe8, 0x60, 0xda, 0xd3, ...}, ...}, ...}, ...}, ...)
	github.com/nspcc-dev/neofs-node/pkg/services/object/get/get.go:23 +0x159
github.com/nspcc-dev/neofs-node/pkg/services/object/get.(*Service).GetRange(...)
	github.com/nspcc-dev/neofs-node/pkg/services/object/get/get.go:19
main.(*objectSvc).GetRange(0x14dea30?, {0x14d9ed0?, 0xc0004fa7b0?}, {{{0x14d10e8, 0xc00051cd50}, 0xc0004ba300, {{0xe8, 0x60, 0xda, 0xd3, ...}, ...}, ...}, ...})
	github.com/nspcc-dev/neofs-node/cmd/neofs-node/object.go:94 +0x5f
github.com/nspcc-dev/neofs-node/pkg/services/object.(*Server).GetRange(0xc0002b5290, 0xc00053c280, {0x14e26f0, 0xc000046c10})
	github.com/nspcc-dev/neofs-node/pkg/services/object/server.go:1314 +0x44a
github.com/nspcc-dev/neofs-sdk-go/proto/object._ObjectService_GetRange_Handler({0x1250900, 0xc0002b5290}, {0x14debe0, 0xc000162000})
	github.com/nspcc-dev/[email protected]/proto/object/service_grpc.pb.go:779 +0x107
google.golang.org/grpc.(*Server).processStreamingRPC(0xc0002b3c00, {0x14d9ed0, 0xc0004fa660}, 0xc0004f4120, 0xc001509620, 0x1ee9ec0, 0x0)
	google.golang.org/[email protected]/server.go:1690 +0x126b
google.golang.org/grpc.(*Server).handleStream(0xc0002b3c00, {0x14dac80, 0xc00018f380}, 0xc0004f4120)
	google.golang.org/[email protected]/server.go:1814 +0xb69
google.golang.org/grpc.(*Server).serveStreams.func2.1()
	google.golang.org/[email protected]/server.go:1030 +0x7f
created by google.golang.org/grpc.(*Server).serveStreams.func2 in goroutine 321
	google.golang.org/[email protected]/server.go:1041 +0x125

[roman-khimov]

Please add some high-level statistics to 256K commit message (maybe to the first one as well), we need this to be kept in git log.

[roman-khimov]

Hmm, some problem with UTs after rebase.