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x/tools/gopls: eliminate dependence on "seen files" #57558

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findleyr opened this issue Jan 3, 2023 · 1 comment
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x/tools/gopls: eliminate dependence on "seen files" #57558

findleyr opened this issue Jan 3, 2023 · 1 comment
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gopls Issues related to the Go language server, gopls. Tools This label describes issues relating to any tools in the x/tools repository.
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gopls/v0.12.0

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findleyr commented Jan 3, 2023

Caveat: this is an abstract issue, but sufficiently fundamental to warrant independent tracking.

In two places inside gopls, there is a notion of "previously seen" files that affects gopls behavior:

  • cache.View.knownFile, which is used to determine if a file is relevant to a given view
  • cache.snapshot.FindFile (and anything that walks the snapshot.files set), which is used to filter to relevant or active files

These notions have no intrinsic definition: by construction they are path dependent. As such, they have been a source of historical and current bugs (for example, changing configuration can invalidate the set of known files, which leads to undefined behavior). They are also a source of test flakes, which is really just a manifestation of underlying bugginess.

We should replace these with well-defined notions, on a case by case basis. For example "is a file in the workspace directory", or "is this file in a loaded package, after loading completes".

CC @adonovan @pjweinb
@findleyr findleyr added this to the gopls/v0.12.0 milestone Jan 3, 2023
@findleyr findleyr self-assigned this Jan 3, 2023
@gopherbot gopherbot added Tools This label describes issues relating to any tools in the x/tools repository. gopls Issues related to the Go language server, gopls. labels Jan 3, 2023
@findleyr findleyr mentioned this issue Jan 3, 2023
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Change https://go.dev/cl/459560 mentions this issue: gopls/internal/regtest: avoid race in TestSwitchFromGOPATHToModuleMode

gopherbot pushed a commit to golang/tools that referenced this issue Jan 3, 2023
@findleyr
gopls/internal/regtest: avoid race in TestSwitchFromGOPATHToModuleMode
1e0dff2 
Fix two bugs in TestSwitchFromGOPATHToModuleMode:
- `go mod init` was run in the wrong directory.
- on-disk change notifications raced with the main.go edit, causing us
  to only encounter the problem of the previous bullet in rare cases
  where the on-disk notification won the race

I've filed golang/go#57558 to track fixing the fundamental raciness of
view changes.

Fixes golang/go#57512

Change-Id: I2b21f944377e0ba45ee7be019a28f18a334f3516
Reviewed-on: https://go-review.googlesource.com/c/tools/+/459560
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Robert Findley <rfindley@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
This was referenced Jan 20, 2023
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