NLog.Targets.GZipFile for writing GZip Log Files #5783
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Caution Review failedThe pull request is closed. WalkthroughThis update introduces a new logging target, Changes
Sequence Diagram(s)sequenceDiagram
participant App as Application
participant Logger as Logger
participant GZipFileTarget as GZipFileTarget
participant FileSystem as File System
App->>Logger: Log message
Logger->>GZipFileTarget: Write(logEvent)
GZipFileTarget->>FileSystem: Open gzip file stream
GZipFileTarget->>FileSystem: Write compressed log message
GZipFileTarget->>FileSystem: Close stream (on shutdown)
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Actionable comments posted: 1
🧹 Nitpick comments (1)
tests/NLog.Targets.GZipFile.Tests/GZipFileTests.cs (1)
34-40: Consider adding test for CompressionLevel configurationThe tests cover most aspects of the GZipFileTarget, but there's no test for the
CompressionLevelproperty. Consider adding a test that verifies different compression levels work correctly.
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build.ps1(1 hunks)run-tests.ps1(2 hunks)src/NLog.Targets.AtomicFile/NLog.Targets.AtomicFile.csproj(1 hunks)src/NLog.Targets.GZipFile/GZipFIleTarget.cs(1 hunks)src/NLog.Targets.GZipFile/NLog.Targets.GZipFile.csproj(1 hunks)src/NLog.sln(3 hunks)src/NLog/Targets/FileTarget.cs(1 hunks)tests/NLog.Targets.GZipFile.Tests/GZipFileTests.cs(1 hunks)tests/NLog.Targets.GZipFile.Tests/NLog.Targets.GZipFile.Tests.csproj(1 hunks)
🔇 Additional comments (20)
src/NLog.Targets.AtomicFile/NLog.Targets.AtomicFile.csproj (1)
56-56: Title property updated for .NET 8 target.The updated title correctly reflects that this is the .NET 8 version of the target rather than NetStandard 2.0, which improves clarity in package metadata.
src/NLog/Targets/FileTarget.cs (1)
51-51: Documentation update aligns with new GZip capability.The summary now uses "log-files" instead of "text files," making the description more accurate and inclusive of the new compressed log file capabilities being added through the GZipFileTarget.
src/NLog.Targets.GZipFile/NLog.Targets.GZipFile.csproj (1)
1-81: Well-structured project file for new GZip target.The project file is properly configured with all the necessary settings including target frameworks, metadata, assembly signing, and packaging information. It follows the same patterns as other NLog target projects.
I noticed the project includes a property group for .NET 4.5 (lines 45-48) even though it's not listed in the TargetFrameworks property. This seems intentional for potential future expansion, but you might want to verify.
build.ps1 (1)
43-43: Build script updated to include the new GZip target.The new target is correctly integrated into the build process, following the same pattern as other targets.
Note that the build script includes
net45in the target frameworks list, but the .csproj file only explicitly listsnetstandard2.0andnet46. While this appears intentional (the .csproj does include a property group for net45), ensure this alignment is deliberate.run-tests.ps1 (2)
51-54: Windows test configuration added for GZipFile target.The test configuration follows the same pattern as other targets, ensuring the new GZipFile target tests are executed in the Windows environment.
110-113: Non-Windows test configuration added for GZipFile target.The test configuration properly specifies .NET 6.0 framework for non-Windows environments, consistent with the approach used for other targets.
src/NLog.sln (3)
80-83: New projects added correctly to the solutionThe GZipFile target and its test project have been properly integrated into the solution file with unique GUIDs.
194-201: Build configurations correctly set upBoth Debug and Release configurations are properly configured for the new projects.
231-232: Correct solution folder structureBoth projects are correctly placed under the "Packages" solution folder, maintaining consistency with the existing project organization.
tests/NLog.Targets.GZipFile.Tests/NLog.Targets.GZipFile.Tests.csproj (4)
4-6: Appropriate multi-target framework configurationThe project correctly uses conditional targeting based on Visual Studio version, supporting both .NET Framework 4.6.2 and .NET 8.0 when appropriate.
8-13: Test project configuration properly set upThe project is correctly configured as non-packable with full debug information on .NET Framework, excludes SonarQube analysis, and copies local lock file assemblies - all consistent with other NLog test projects.
16-25: Test dependencies are up-to-date and completeAll necessary testing packages are included with current versions, including Microsoft.NET.Test.Sdk, xunit, and supporting libraries.
27-29: Correct project referenceProperly references the main GZipFile target project for testing.
src/NLog.Targets.GZipFile/GZipFIleTarget.cs (4)
44-59: Constructors implemented properlyBoth default and named constructors are correctly implemented, with the base configuration set in the default constructor and properly called from the named constructor.
61-70: Well-defined configuration propertiesThe compression enablement and compression level properties have appropriate defaults (enabled with fastest compression), allowing users to adjust behavior as needed.
71-81: Important configuration requirements enforcedThe target correctly enforces requirements (KeepFileOpen and ArchiveOldFileOnStartup) that are necessary for proper GZip compression functionality, with clear error messages explaining the constraints.
83-96: CreateFileStream implementation handles all casesThe method correctly:
- Checks preconditions before applying compression
- Falls back to base implementation when compression is disabled
- Wraps the base stream with GZipStream with proper compression settings
- Handles buffering appropriately based on AutoFlush setting
The implementation is robust and covers all necessary scenarios.
tests/NLog.Targets.GZipFile.Tests/GZipFileTests.cs (3)
43-72: Basic GZip compression functionality verifiedThe test properly verifies that log messages are correctly written and compressed, and that the decompressed content matches the expected output. The test also cleans up temporary files appropriately.
74-103: AutoFlush behavior correctly testedTest verifies that disabling AutoFlush does not affect the correctness of the compressed output, an important behavior to validate given the multiple stream wrapping.
105-146: Archive behavior properly testedThe test thoroughly verifies the archiving functionality by:
- Creating an initial log file
- Shutting down and reinitializing the logger
- Verifying that the original content is preserved
- Confirming that the new content is written to the archived file with the expected naming pattern
The test provides good coverage of this critical feature.
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Actionable comments posted: 0
🧹 Nitpick comments (5)
src/NLog.Targets.GZipFile/GZipFileTarget.cs (5)
42-43: Consider consistent casing between target name and class name.The target name is "GzipFile" but the class name is "GZipFileTarget". For consistency, consider changing the target name to "GZipFile" (with uppercase Z).
-[Target("GzipFile")] +[Target("GZipFile")]
50-50: Consider also setting KeepFileOpen in the constructor.While you enforce
KeepFileOpen = truein theInitializeTargetmethod, it would be more consistent to set it directly in the constructor alongsideArchiveOldFileOnStartup.public GZipFileTarget() { ArchiveOldFileOnStartup = true; // Not possible to append to existing file using GZip, must read the entire file into memory and rewrite everything again + KeepFileOpen = true; // GZip compression requires the file to be kept open }
74-80: Fix typo in error message.There's a typo in the error message "GZipFIleTarget" where "FI" should be "Fi".
if (!KeepFileOpen) - throw new NLogConfigurationException("GZipFIleTarget requires KeepFileOpen = true"); + throw new NLogConfigurationException("GZipFileTarget requires KeepFileOpen = true"); if (!ArchiveOldFileOnStartup) - throw new NLogConfigurationException("GZipFIleTarget requires ArchiveOldFileOnStartup = true"); + throw new NLogConfigurationException("GZipFileTarget requires ArchiveOldFileOnStartup = true");
86-87: Consider simplifying condition checks.The checks for
!ArchiveOldFileOnStartup || !KeepFileOpenare redundant since they're already enforced inInitializeTarget. You could simplify this condition.-if (!EnableArchiveFileCompression || CompressionLevel == CompressionLevel.NoCompression || !ArchiveOldFileOnStartup || !KeepFileOpen) +if (!EnableArchiveFileCompression || CompressionLevel == CompressionLevel.NoCompression) return base.CreateFileStream(filePath, bufferSize);
89-96: Consider documenting stream disposal responsibility.The method creates new streams but doesn't explicitly handle their disposal. Consider adding documentation to clarify that the caller is responsible for disposing the returned stream.
Add XML documentation to the
CreateFileStreammethod:/// <inheritdoc /> /// <remarks> /// The caller is responsible for disposing the returned stream. /// </remarks> protected override Stream CreateFileStream(string filePath, int bufferSize)
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📒 Files selected for processing (9)
build.ps1(1 hunks)run-tests.ps1(2 hunks)src/NLog.Targets.AtomicFile/NLog.Targets.AtomicFile.csproj(1 hunks)src/NLog.Targets.GZipFile/GZipFileTarget.cs(1 hunks)src/NLog.Targets.GZipFile/NLog.Targets.GZipFile.csproj(1 hunks)src/NLog.sln(3 hunks)src/NLog/Targets/FileTarget.cs(1 hunks)tests/NLog.Targets.GZipFile.Tests/GZipFileTests.cs(1 hunks)tests/NLog.Targets.GZipFile.Tests/NLog.Targets.GZipFile.Tests.csproj(1 hunks)
✅ Files skipped from review due to trivial changes (3)
- build.ps1
- src/NLog.sln
- tests/NLog.Targets.GZipFile.Tests/GZipFileTests.cs
🚧 Files skipped from review as they are similar to previous changes (5)
- src/NLog.Targets.AtomicFile/NLog.Targets.AtomicFile.csproj
- src/NLog/Targets/FileTarget.cs
- run-tests.ps1
- tests/NLog.Targets.GZipFile.Tests/NLog.Targets.GZipFile.Tests.csproj
- src/NLog.Targets.GZipFile/NLog.Targets.GZipFile.csproj
🔇 Additional comments (4)
src/NLog.Targets.GZipFile/GZipFileTarget.cs (4)
48-51: LGTM! Good comment explaining the constraint.The constructor properly sets
ArchiveOldFileOnStartup = truewith a clear explanation of why this is necessary for GZip files.
64-64: LGTM! Good default configuration.Setting the default value to
trueforEnableArchiveFileCompressionmakes sense for a GZip file target.
69-69: LGTM! Sensible default compression level.Choosing
CompressionLevel.Fastestas the default is a good balance between compression and performance.
92-95: LGTM! Good handling of buffering configuration.The code properly respects the
AutoFlushandBufferSizesettings to determine whether additional buffering is needed.
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Created wiki: https://github.com/NLog/NLog/wiki/GZip-File-Target |
Using dotnet
GZipStreamfor writing directly to GZip File. Alternative to the old EnableArchiveFileCompression = true.The
EnableArchiveFileCompressionhad the side-effect that it would stall other file-logging, until file-compression of old file had completed (slow when large log-file)