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Reduce AOT file-size by changing LoggingConfiguration CheckUnusedTargets to use HashSet instead of Linq - #6195
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WalkthroughThis PR changes GetAllTargetsThreadSafe() to return a Target[] snapshot, adds an ICollection.Select extension that yields results lazily with an early-empty fast path, and refactors CheckUnusedTargets() to detect unused targets using a wrapping-target lookup for wrapper/compound relationships. ChangesUnused Target Detection Refactoring
Estimated code review effort🎯 4 (Complex) | ⏱️ ~45 minutes Poem
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✅ Passed checks (3 passed)
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Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@src/NLog/Config/LoggingConfiguration.cs`:
- Around line 912-915: The loop building targetNamesAtRules incorrectly
enumerates rule.Targets directly; change it to use the thread-safe enumerator
rule.GetTargetsThreadSafe() (consistent with GetAllTargetsToFlush) so concurrent
modifications won't throw or produce inconsistent results—update the foreach
that currently reads "foreach (var t in rule.Targets)" to "foreach (var t in
rule.GetTargetsThreadSafe())" and keep adding t.Name to targetNamesAtRules.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
⚙️ Run configuration
Configuration used: Repository UI
Review profile: CHILL
Plan: Pro
Run ID: b9020103-e65f-4bd4-86a4-086f7df342a9
📒 Files selected for processing (2)
src/NLog/Config/LoggingConfiguration.cssrc/NLog/Internal/CollectionExtensions.cs
| var targetNamesAtRules = new HashSet<string>(); | ||
| foreach (var rule in GetLoggingRulesThreadSafe()) | ||
| foreach (var t in rule.Targets) | ||
| targetNamesAtRules.Add(t.Name); |
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Use thread-safe access for rule targets.
This iterates rule.Targets directly, but other methods in this file (e.g., GetAllTargetsToFlush at line 713-720) use rule.GetTargetsThreadSafe() for thread-safe enumeration. If the rule's target list is modified concurrently, this could throw during enumeration or yield inconsistent results.
Proposed fix
var targetNamesAtRules = new HashSet<string>();
foreach (var rule in GetLoggingRulesThreadSafe())
- foreach (var t in rule.Targets)
+ foreach (var t in rule.GetTargetsThreadSafe())
targetNamesAtRules.Add(t.Name);📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| var targetNamesAtRules = new HashSet<string>(); | |
| foreach (var rule in GetLoggingRulesThreadSafe()) | |
| foreach (var t in rule.Targets) | |
| targetNamesAtRules.Add(t.Name); | |
| var targetNamesAtRules = new HashSet<string>(); | |
| foreach (var rule in GetLoggingRulesThreadSafe()) | |
| foreach (var t in rule.GetTargetsThreadSafe()) | |
| targetNamesAtRules.Add(t.Name); |
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@src/NLog/Config/LoggingConfiguration.cs` around lines 912 - 915, The loop
building targetNamesAtRules incorrectly enumerates rule.Targets directly; change
it to use the thread-safe enumerator rule.GetTargetsThreadSafe() (consistent
with GetAllTargetsToFlush) so concurrent modifications won't throw or produce
inconsistent results—update the foreach that currently reads "foreach (var t in
rule.Targets)" to "foreach (var t in rule.GetTargetsThreadSafe())" and keep
adding t.Name to targetNamesAtRules.
There was a problem hiding this comment.
Actionable comments posted: 1
♻️ Duplicate comments (1)
src/NLog/Config/LoggingConfiguration.cs (1)
912-913:⚠️ Potential issue | 🟠 Major | ⚡ Quick winUse thread-safe target enumeration in rule scan.
CheckUnusedTargets()still enumeratesrule.Targetsdirectly. This can race with concurrent mutations and produce inconsistent/throwing traversal; userule.GetTargetsThreadSafe()here.🔧 Proposed fix
- var targetNamesAtRules = new HashSet<string>(GetLoggingRulesThreadSafe().SelectMany(r => r.Targets).Select(t => t.Name)); + var targetNamesAtRules = new HashSet<string>(); + foreach (var rule in GetLoggingRulesThreadSafe()) + { + foreach (var target in rule.GetTargetsThreadSafe()) + { + targetNamesAtRules.Add(target.Name); + } + }🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@src/NLog/Config/LoggingConfiguration.cs` around lines 912 - 913, CheckUnusedTargets() currently enumerates rule.Targets which can race with concurrent mutations; change the enumeration to use the thread-safe accessor by calling rule.GetTargetsThreadSafe() (and keep using GetLoggingRulesThreadSafe()) so the HashSet construction uses GetLoggingRulesThreadSafe().SelectMany(r => r.GetTargetsThreadSafe()).Select(t => t.Name) instead of r.Targets to avoid inconsistent/throwing traversal.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@src/NLog/Config/LoggingConfiguration.cs`:
- Around line 916-927: The current IsUnusedInList logic treats a wrapperTarget
as used as soon as it has any parent wrapper
(targets.ContainsKey(wrapperTarget)), which falsely marks whole chains as used;
change this to traverse the wrapper chain (follow targets[wrapperTarget]) and
only treat a wrapperTarget as used if its Name is in targetNamesAtRules or any
ancestor in the wrapper chain is referenced, using a visited/HashSet to avoid
cycles; update the same pattern where targets.ContainsKey(wrapperTarget) is used
(also at the later check around the 939-940 area) so inner targets are only
considered used when an actual referenced ancestor exists.
---
Duplicate comments:
In `@src/NLog/Config/LoggingConfiguration.cs`:
- Around line 912-913: CheckUnusedTargets() currently enumerates rule.Targets
which can race with concurrent mutations; change the enumeration to use the
thread-safe accessor by calling rule.GetTargetsThreadSafe() (and keep using
GetLoggingRulesThreadSafe()) so the HashSet construction uses
GetLoggingRulesThreadSafe().SelectMany(r => r.GetTargetsThreadSafe()).Select(t
=> t.Name) instead of r.Targets to avoid inconsistent/throwing traversal.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
⚙️ Run configuration
Configuration used: Repository UI
Review profile: CHILL
Plan: Pro
Run ID: 73c74090-b01b-40f6-bb12-d3664a354513
📒 Files selected for processing (2)
src/NLog/Config/LoggingConfiguration.cssrc/NLog/Internal/CollectionExtensions.cs
| bool IsUnusedInList(Target target1, Dictionary<Target, List<Target>> targets) | ||
| { | ||
| if (targets.Contains(target1)) | ||
| if (targets.TryGetValue(target1, out var wrappers)) | ||
| { | ||
| foreach (var wrapperTarget in targets[target1]) | ||
| foreach (var wrapperTarget in wrappers) | ||
| { | ||
| if (targetNamesAtRules.Contains(wrapperTarget.Name)) | ||
| return false; | ||
|
|
||
| if (wrappedTargets.Contains(wrapperTarget)) | ||
| return false; | ||
|
|
||
| if (compoundTargets.Contains(wrapperTarget)) | ||
| if (targets.ContainsKey(wrapperTarget)) | ||
| return false; | ||
| } |
There was a problem hiding this comment.
Traverse wrapper chains before deciding “used”.
The targets.ContainsKey(wrapperTarget) early return marks inner targets as used just because they have a parent wrapper, even when no ancestor wrapper is referenced by any rule. This misses genuinely unused chains.
🔧 Proposed fix
- bool IsUnusedInList(Target target1, Dictionary<Target, List<Target>> targets)
+ bool IsUsedByRuleOrWrapperChain(Target target1, Dictionary<Target, List<Target>> targets)
{
- if (targets.TryGetValue(target1, out var wrappers))
+ var pendingTargets = new Stack<Target>();
+ var visited = new HashSet<Target>(SingleItemOptimizedHashSet<Target>.ReferenceEqualityComparer.Default);
+ pendingTargets.Push(target1);
+
+ while (pendingTargets.Count > 0)
{
+ var current = pendingTargets.Pop();
+ if (!targets.TryGetValue(current, out var wrappers))
+ continue;
+
foreach (var wrapperTarget in wrappers)
{
if (targetNamesAtRules.Contains(wrapperTarget.Name))
- return false;
+ return true;
- if (targets.ContainsKey(wrapperTarget))
- return false;
+ if (visited.Add(wrapperTarget))
+ pendingTargets.Push(wrapperTarget);
}
}
- return true;
+ return false;
}
@@
- if (!IsUnusedInList(target, wrappingTargets))
+ if (IsUsedByRuleOrWrapperChain(target, wrappingTargets))
continue;Also applies to: 939-940
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@src/NLog/Config/LoggingConfiguration.cs` around lines 916 - 927, The current
IsUnusedInList logic treats a wrapperTarget as used as soon as it has any parent
wrapper (targets.ContainsKey(wrapperTarget)), which falsely marks whole chains
as used; change this to traverse the wrapper chain (follow
targets[wrapperTarget]) and only treat a wrapperTarget as used if its Name is in
targetNamesAtRules or any ancestor in the wrapper chain is referenced, using a
visited/HashSet to avoid cycles; update the same pattern where
targets.ContainsKey(wrapperTarget) is used (also at the later check around the
939-940 area) so inner targets are only considered used when an actual
referenced ancestor exists.
|
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After:
ProcessPath: 'C:\projects\nlog\Tests\TestTrimPublish\bin\release\net8.0\win-X64\publish\TestTrimPublish.exe' with FileSize: 4774912Before:
ProcessPath: 'C:\projects\nlog\Tests\TestTrimPublish\bin\release\net8.0\win-X64\publish\TestTrimPublish.exe' with FileSize: 4850688NLog v6.1.3
ProcessPath: 'C:\projects\nlog\tests\TestTrimPublish\bin\release\net8.0\win-x64\publish\TestTrimPublish.exe' with FileSize: 5486592