[Copilot]

When a caller cancels the context, client methods return a raw gRPC status error (rpc error: code = Canceled ...). errors.Is(err, context.Canceled) doesn't match it, so callers have to string-match the message.

_, err := c.ObjectSearchV2(ctx, cnr, nil, nil, signer, opts)
errors.Is(err, context.Canceled) // now true after cancel(); previously false

• wrapCtxErr (client/grpc.go)
  • Wraps an error as fmt.Errorf("%w: %w", ctx.Err(), err) when the caller's ctx is done and the error is a gRPC Canceled or DeadlineExceeded status.
  • The original gRPC error stays in the chain, so status.Code(err) still works.
  • Server-originated Canceled/DeadlineExceeded is deliberately left untouched when the local ctx is still live, so a server-side cancellation is never reported as a caller cancellation.
• Where it's applied
  • Stream opening, send and close-send in client/grpc.go, plus callUnary's RecvMsg.
  • Per-message stream reads and writes in PayloadReader and DefaultObjectWriter, via dowithTimeout.
  • dowithTimeout now takes a ctx as its first (unexported) parameter. Both stream types store the context they were opened with. The stored context is the derived one, so Close()-initiated cancels surface as context.Canceled too.
• Test: TestWrapCtxErr covers the live ctx, cancelled ctx, nil error and deadline cases.

Review note: the in-stream wrapping is exercised only by the helper's unit test. There's no end-to-end test that cancels mid-stream.

• Fixes Properly wrap context-related NeoFS Client errors #624

[roman-khimov]

@copilot, fix linter. default case in switch should be sufficient for the purpose

[Copilot]

@copilot, fix linter. default case in switch should be sufficient for the purpose

Added a default case that returns err to the switch in wrapCtxErr (client/grpc.go), replacing the trailing return err. go vet and TestWrapCtxErr pass. I haven't run the linter itself, so please check that the lint job is green.

[codecov]

Codecov Report

❌ Patch coverage is 86.36364% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.42%. Comparing base (7f44025) to head (3a34950).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
client/grpc.go	75.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #902      +/-   ##
==========================================
+ Coverage   61.38%   61.42%   +0.03%     
==========================================
  Files         177      177              
  Lines       17233    17243      +10     
==========================================
+ Hits        10579    10591      +12     
+ Misses       6654     6652       -2     

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