Fix graphql concurrency issue with ContentPickerFiled

[sebastienros]

Fixes #15731

[sebastienros]

@lampersky Can you check this PR?

[lampersky]

@sebastienros I've just checked, and I'm still getting exception from time to time:

GraphQL.Execution.UnhandledError: Error trying to resolve field 'contentItems'.
 ---> System.InvalidOperationException: Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.
   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at YesSql.Session.Get[T](IList`1 documents, String collection)
   at YesSql.Services.DefaultQuery.Query`1.ListImpl()
   at YesSql.Services.DefaultQuery.Query`1.ListImpl()
   at OrchardCore.ContentManagement.GraphQL.DataLoaderExtensions.LoadPublishedContentItemsAsync(IEnumerable`1 contentItemIds, ISession session)
   at GraphQL.DataLoader.CollectionBatchDataLoader`2.FetchAsync(IEnumerable`1 list, CancellationToken cancellationToken)
   at GraphQL.DataLoader.DataLoaderPair`2.GetResultAsync(CancellationToken cancellationToken) in /_/src/GraphQL.DataLoader/DataLoaderPair.cs:line 81
   at OrchardCore.ContentFields.GraphQL.SebContentPickerFieldQueryObjectType.<>c.<<-ctor>b__0_1>d.MoveNext() in C:\\repo\\Project.Core\\SebFix.cs:line 34
--- End of stack trace from previous location ---
   at GraphQL.Resolvers.FuncFieldResolver`2.<>c__DisplayClass3_0.<<-ctor>b__1>d.MoveNext()
--- End of stack trace from previous location ---
   at GraphQL.Execution.ExecutionStrategy.ExecuteNodeAsync(ExecutionContext context, ExecutionNode node) in /_/src/GraphQL/Execution/ExecutionStrategy.cs:line 472
   --- End of inner exception stack trace ---

[Piedone]

@CodeRabbit review

[Piedone]

Ooops, wrong CodeRabbit. @coderabbitai review

[coderabbitai]

@Piedone, I've reviewed the changes in the ContentPickerFieldQueryObjectType.cs file. The approach uses asynchronous data loading which is generally effective for handling large volumes of data concurrently. However, the concurrency issue reported might stem from how collections are handled during the data loading process.

Here are a few suggestions:

1. Ensure Thread Safety: Verify that all collections used in the data loading process, especially those manipulated in the SelectMany operation, are thread-safe or properly synchronized.
2. Review DataLoader Implementation: Check the implementation of GetOrAddPublishedContentItemByIdDataLoader to ensure it manages instances of data loaders in a thread-safe manner.
3. Error Handling: Enhance error handling around data fetching operations to gracefully handle potential concurrency issues.

If these aspects are already handled, it might be beneficial to look into the specific scenarios under which the errors occur to further isolate the issue. If you need further analysis or specific code suggestions, feel free to let me know!

Analysis chain

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Scripts executed

The following scripts were executed for the analysis:

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Script:

#!/bin/bash
# Fetch the changes made in the PR
gh pr view 15734 --repo OrchardCMS/OrchardCore --json files --jq '.files[].path'

Length of output: 183

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Script:

#!/bin/bash
# Read the contents of the modified file in the PR
cat src/OrchardCore.Modules/OrchardCore.ContentFields/GraphQL/Types/ContentPickerFieldQueryObjectType.cs

Length of output: 1519

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Review triggered.

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[coderabbitai]

Walkthrough

Walkthrough

The update involves modifying the ContentPickerFieldQueryObjectType class in the OrchardCore ContentFields module. Specifically, the method responsible for resolving content has been renamed from ResolveAsync to ResolveLockedAsync and now incorporates the async/await syntax for more efficient content item loading. This change enhances the method's ability to handle asynchronous operations and locking mechanisms more effectively.

Changes

File Path	Change Summary
.../ContentFields/GraphQL/Types/ContentPickerFieldQueryObjectType.cs	Renamed ResolveAsync to ResolveLockedAsync and updated to use async/await syntax for loading content items.

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Recent Review Details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 112c0d4 and 81a9518.

Files selected for processing (1)

• src/OrchardCore.Modules/OrchardCore.ContentFields/GraphQL/Types/ContentPickerFieldQueryObjectType.cs (1 hunks)

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[coderabbitai]

Actionable comments posted: 1

[Piedone]

Requesting changes just to make it visible in the PR list too (#15734 (comment)).