C# extension continuosly errors while viewing/scrolling a diff of two csharp files.

[makzimus]

Type: Bug

Issue Description

When diffing a csharp file the extension will continuously spam 2 errors while scrolling:

Request textDocument/inlayHint failed
Request textDocument/semanticTokens/range failed.

Steps to Reproduce

• Diff 2 csharp files (I used the perforce SCM extension to show a diff in this case).
• Scroll the diff.

Expected Behavior

No errors.

Actual Behavior

Errors appear.

Logs

C# log

[Error - 2:21:04 PM] Request textDocument/inlayHint failed. Message: Invalid URI: The hostname could not be parsed. Code: -32000 [object Object] [Error - 2:21:04 PM] Request textDocument/semanticTokens/range failed. Message: Invalid URI: The hostname could not be parsed. Code: -32000 [object Object] [Error - 2:21:04 PM] Request textDocument/inlayHint failed. Message: Invalid URI: The hostname could not be parsed. Code: -32000 [object Object] [Error - 2:21:04 PM] Request textDocument/semanticTokens/range failed. Message: Invalid URI: The hostname could not be parsed. Code: -32000 [object Object] Using dotnet configured on PATH

Environment information

VSCode version: 1.81.1
C# Extension: 2.0.416
Using OmniSharp: false

Visual Studio Code Extensions

Extension	Author	Version	Folder Name
atlascode	atlassian	3.0.5	atlassian.atlascode-3.0.5
cmake	twxs	0.0.17	twxs.cmake-0.0.17
cmake-tools	ms-vscode	1.15.31	ms-vscode.cmake-tools-1.15.31
comment-styler	krembolabs	1.0.2	krembolabs.comment-styler-1.0.2
cpptools	ms-vscode	1.17.5	ms-vscode.cpptools-1.17.5-win32-x64
csdevkit	ms-dotnettools	0.3.21	ms-dotnettools.csdevkit-0.3.21-win32-x64
csharp	ms-dotnettools	2.0.416	ms-dotnettools.csharp-2.0.416-win32-x64
githistory	donjayamanne	0.6.20	donjayamanne.githistory-0.6.20
gitstash	arturock	5.2.0	arturock.gitstash-5.2.0
godot-tools	geequlim	1.3.1	geequlim.godot-tools-1.3.1
hexeditor	ms-vscode	1.9.12	ms-vscode.hexeditor-1.9.12
isort	ms-python	2023.10.1	ms-python.isort-2023.10.1
jgutility	jg	1.0.0	jg.jgutility-1.0.0
json-escaper	joshuapoehls	1.1.2	joshuapoehls.json-escaper-1.1.2
jsonpath-extract	davidmarek	1.2.3	davidmarek.jsonpath-extract-1.2.3
jupyter-keymap	ms-toolsai	1.1.2	ms-toolsai.jupyter-keymap-1.1.2
mono-debug	ms-vscode	0.16.3	ms-vscode.mono-debug-0.16.3
partial-diff	ryu1kn	1.4.3	ryu1kn.partial-diff-1.4.3
path-intellisense	christian-kohler	2.8.4	christian-kohler.path-intellisense-2.8.4
perforce	mjcrouch	4.15.7	mjcrouch.perforce-4.15.7
prettify-json	mohsen1	0.0.3	mohsen1.prettify-json-0.0.3
project-manager	alefragnani	12.7.0	alefragnani.project-manager-12.7.0
python	ms-python	2023.4.0	ms-python.python-2023.4.0
remote-containers	ms-vscode-remote	0.304.0	ms-vscode-remote.remote-containers-0.304.0
remote-explorer	ms-vscode	0.4.1	ms-vscode.remote-explorer-0.4.1
remote-ssh	ms-vscode-remote	0.102.0	ms-vscode-remote.remote-ssh-0.102.0
remote-ssh-edit	ms-vscode-remote	0.86.0	ms-vscode-remote.remote-ssh-edit-0.86.0
remote-wsl	ms-vscode-remote	0.81.0	ms-vscode-remote.remote-wsl-0.81.0
rest-client	humao	0.25.1	humao.rest-client-0.25.1
todo-tree	Gruntfuggly	0.0.226	gruntfuggly.todo-tree-0.0.226
vs-keybindings	ms-vscode	0.2.1	ms-vscode.vs-keybindings-0.2.1
vscode-dotnet-runtime	ms-dotnettools	1.7.1	ms-dotnettools.vscode-dotnet-runtime-1.7.1
vscode-gradle	vscjava	3.12.7	vscjava.vscode-gradle-3.12.7
vscode-pylance	ms-python	2023.8.40	ms-python.vscode-pylance-2023.8.40
vscode-yaml	redhat	1.14.0	redhat.vscode-yaml-1.14.0
vscodeintellicode-csharp	ms-dotnettools	0.1.26	ms-dotnettools.vscodeintellicode-csharp-0.1.26-win32-x64
vstuc	visualstudiotoolsforunity	0.9.0	visualstudiotoolsforunity.vstuc-0.9.0
xml	DotJoshJohnson	2.5.1	dotjoshjohnson.xml-2.5.1

Extension version: 2.0.416
VS Code version: Code 1.81.1 (6c3e3dba23e8fadc360aed75ce363ba185c49794, 2023-08-09T22:22:42.175Z)
OS version: Windows_NT x64 10.0.22621
Modes:

System Info

Item	Value
CPUs	13th Gen Intel(R) Core(TM) i9-13900KS (32 x 3187)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: disabled_off direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled
Load (avg)	undefined
Memory (System)	31.77GB (4.27GB free)
Process Argv	--crash-reporter-id 3813fa00-ad68-4b4c-be1e-46141697892d
Screen Reader	no
VM	0%

A/B Experiments

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pythonnosmt12:30797651
pythonidxpt:30805730
pythonnoceb:30805159
asynctok:30821568
dsvsc013:30795093
dsvsc014:30804076
diffeditorv2:30821572

[dibarbet]

Looks like we're erroring creating URIs.

@makzimus could you set the 'dotnet.server.trace' setting to 'Trace' and attach the contents of the C# LSP trace logs? That should tell us what URI its throwing on.

Thanks!

[makzimus]

Log file snippet:
csharp_lsp_trace.txt

[dibarbet]

Thanks, I think the logs have enough info to fix. I'll take a look.

[dibarbet]

System.URI is throwing on these URIs as it tries to parse the URI. Taking a look at the RFC spec (link), it looks like one of them should be valid, the other one is not

Taking a look at them one by one (minus the query parameters):
perforce://@=1454483/some/file/here/source.cs

Splitting it up into parts (using this ref) we have
perforce(scheme):(sep)//(begin hier-part)@=1454483(authority)/some/file/here/source.cs(path)

The authority is defined as [ userinfo "@" ] host [ ":" port ]. We have an empty userinfo followed by an @ followed by the host =1454483. Host is defined as IP-literal / IPv4address / reg-name. Our name is not an IP and fits neither an IP-Literal nor a IPv4address. The definition of reg-name is *( unreserved / pct-encoded / sub-delims ). = is a valid character in sub-delims and 1454483 are in unreserved so it appears this should be a valid URI. However, System.URI is throwing on this host name as it doesn't follow the URI RFC exactly. See dotnet/runtime#64707

Taking a look at perforce://%239/some/file/here/source.cs we can extract the host as before to be %239. This is pct-encoded (generally allowed in the host) followed by a 9. However I do not think this URI is valid as the spec states this:

URI producing applications must not use percent-encoding in host unless it is used to represent a UTF-8 character sequence.

Which '#' (what %23 represents) is not. Additionally, '#' is not part of 'sub-delims' and so wouldn't be valid to leave unencoded either.

[dibarbet]

Not sure there is much we can do here at the moment. For the first URI we need dotnet/runtime#64707, for the second I think you'd need to reach out to whichever extension is creating these URIs as I don't think it's valid.

[makzimus]

A better behaviour might be to not use showErrorMessage for these types of errors, and instead just rely on logging. It is quite the experience having no way to mute the error notifications.

[garrettlondon1]

Trying to create DocumentContext for textDocument/semanticTokens/range for (no project context) for file:///c%3A/Components/Deal/Other/CreateDeal.razor
[Warn  - 7:23:06 PM] Could not create a document context for textDocument/semanticTokens/range for file:///c%3A/Components/Deal/Other/CreateDeal.razor. Endpoint may crash later if it calls GetRequiredDocumentContext.
[Error - 7:23:06 PM] System.ArgumentNullException: Value cannot be null. (Parameter 'DocumentContext')
   at Microsoft.AspNetCore.Razor.LanguageServer.EndpointContracts.RazorRequestContext.GetRequiredDocumentContext() in /_/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/EndpointContracts/RazorRequestContext.cs:line 47
   at Microsoft.AspNetCore.Razor.LanguageServer.Semantic.SemanticTokensRangeEndpoint.HandleRequestAsync(SemanticTokensRangeParams request, RazorRequestContext requestContext, CancellationToken cancellationToken) in /_/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Semantic/SemanticTokensRangeEndpoint.cs:line 71
   at Microsoft.CommonLanguageServerProtocol.Framework.QueueItem`3.StartRequestAsync(TRequestContext context, CancellationToken cancellationToken)
[Error - 7:23:06 PM] Request textDocument/semanticTokens/range failed.
  Message: Value cannot be null. (Parameter 'DocumentContext')
  Code: -32000 
[object Object]

Getting the same, dozens of errors when scrolling a document

[dansoper]

I am experiencing this issue - using the GitLens extension - while scrolling in Diff view. I understand the comments above about the fix being required elsewhere, but please could you consider not alerting so many errors? It makes reviewing diffs very annoying!

Thanks.

[garrettlondon1]

At this point I don't care when the bugs get fixed I just want to be able to hide the error message from popping up.

@davidwengier any insight on this?

[davidwengier]

This has nothing to do with me, but personally speaking I also think the toasts for every failed LSP request are annoying and wish they could be turned off or just didn't happen. I don't even know if that is possible though. I also agree with @dibarbet that if an extension is not sending valid URIs they should fix that. LSP is a pretty objectively URI based protocol.

[dibarbet]

So two things -
@garrettlondon1 @davidwengier your issue is different from the one here - it looks like an error in the Razor language server not related to a URI parsing failure:

at Microsoft.AspNetCore.Razor.LanguageServer.EndpointContracts.RazorRequestContext.GetRequiredDocumentContext() in /_/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/EndpointContracts/RazorRequestContext.cs:line 47

Could you file a separate issue on dotnet/razor?

Second thing is that for the original issue here, its actually not the extension that is creating the pop-up boxes. We error the request (because we don't know the URI), but then vscode's LSP client is the one actually creating the pop-up. I do not know of a way to prevent that, other than not erroring the request. But I'll leave this open so we can take a look.

[garrettlondon1]

Created an issue for the second point above here: #6977

[dibarbet]

The latest prerelease of the C# extension should fix the issue where normal git diff windows throw errors (related to #6973).

I suspect the perforce diffs may still throw errors due to the issues with the URIs they are creating (see above). That likely needs a fix on their end.

Closing this issue. If you're still seeing these errors (outside of the perforce diff), please file a new issue.