in_winevtlog: Plug glitches of time offset for DST/STD switches #11291
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Signed-off-by: Hiroshi Hatake <hiroshi@chronosphere.io>
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Note Other AI code review bot(s) detectedCodeRabbit has detected other AI code review bot(s) in this pull request and will avoid duplicating their findings in the review comments. This may lead to a less comprehensive review. WalkthroughThe Changes
Sequence Diagram(s)sequenceDiagram
participant pack_filetime as pack_filetime()
participant WinAPI as Windows API
participant Encoder as log_encoder
pack_filetime->>WinAPI: FileTimeToSystemTime(&st_utc)
pack_filetime->>WinAPI: GetDynamicTimeZoneInformation(&dtzi)
pack_filetime->>WinAPI: SystemTimeToTzSpecificLocalTimeEx(&dtzi, &st_utc, &st_local)
pack_filetime->>pack_filetime: compute bias, offset sign, HHMM
pack_filetime->>pack_filetime: format "YYYY-MM-DD HH:MM:SS ±HHMM"
pack_filetime->>Encoder: append formatted timestamp
alt any API error
pack_filetime->>pack_filetime: return -1
end
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~20 minutes
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Actionable comments posted: 1
🧹 Nitpick comments (2)
plugins/in_winevtlog/pack.c (2)
26-26: Unused include.The
<stdlib.h>include appears to be unused in this file. Consider removing it if not needed.
297-312: Consider handlingTIME_ZONE_ID_INVALID.
GetDynamicTimeZoneInformationcan returnTIME_ZONE_ID_INVALID(0xFFFFFFFF) on failure. While rare, the current code would proceed with potentially uninitializeddtzivalues.tz_id = GetDynamicTimeZoneInformation(&dtzi); + if (tz_id == TIME_ZONE_ID_INVALID) { + return -1; + } if (!SystemTimeToTzSpecificLocalTimeEx(&dtzi, &st_utc, &st_local)) {
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📒 Files selected for processing (1)
plugins/in_winevtlog/pack.c(2 hunks)
🧰 Additional context used
🧠 Learnings (7)
📚 Learning: 2025-08-31T12:46:11.940Z
Learnt from: ThomasDevoogdt
Repo: fluent/fluent-bit PR: 9277
File: .github/workflows/pr-compile-check.yaml:147-151
Timestamp: 2025-08-31T12:46:11.940Z
Learning: In fluent-bit CMakeLists.txt, the system library preference flags are defined as FLB_PREFER_SYSTEM_LIB_ZSTD and FLB_PREFER_SYSTEM_LIB_KAFKA with the FLB_ prefix.
Applied to files:
plugins/in_winevtlog/pack.c
📚 Learning: 2025-08-29T06:25:02.561Z
Learnt from: shadowshot-x
Repo: fluent/fluent-bit PR: 10794
File: tests/internal/aws_compress.c:7-7
Timestamp: 2025-08-29T06:25:02.561Z
Learning: In Fluent Bit, ZSTD (zstandard) compression library is bundled directly in the source tree at `lib/zstd-1.5.7` and is built unconditionally as a static library. Unlike optional external dependencies, ZSTD does not use conditional compilation guards like `FLB_HAVE_ZSTD` and is always available. Headers like `<fluent-bit/flb_zstd.h>` can be included directly without guards.
Applied to files:
plugins/in_winevtlog/pack.c
📚 Learning: 2025-08-29T06:25:27.250Z
Learnt from: shadowshot-x
Repo: fluent/fluent-bit PR: 10794
File: tests/internal/aws_compress.c:93-107
Timestamp: 2025-08-29T06:25:27.250Z
Learning: In Fluent Bit, ZSTD compression is enabled by default and is treated as a core dependency, not requiring conditional compilation guards like `#ifdef FLB_HAVE_ZSTD`. Unlike some other optional components such as ARROW/PARQUET (which use `#ifdef FLB_HAVE_ARROW` guards), ZSTD support is always available and doesn't need build-time conditionals. ZSTD headers are included directly without guards across multiple plugins and core components.
Applied to files:
plugins/in_winevtlog/pack.c
📚 Learning: 2025-08-29T06:24:44.797Z
Learnt from: shadowshot-x
Repo: fluent/fluent-bit PR: 10794
File: src/aws/flb_aws_compress.c:26-26
Timestamp: 2025-08-29T06:24:44.797Z
Learning: In Fluent Bit, ZSTD support is always available and enabled by default. The build system automatically detects and uses either the system libzstd library or builds the bundled ZSTD version. Unlike other optional dependencies like Arrow which use conditional compilation guards (e.g., FLB_HAVE_ARROW), ZSTD does not require conditional includes or build flags.
Applied to files:
plugins/in_winevtlog/pack.c
📚 Learning: 2025-11-21T06:23:29.770Z
Learnt from: cosmo0920
Repo: fluent/fluent-bit PR: 11171
File: include/fluent-bit/flb_lib.h:52-53
Timestamp: 2025-11-21T06:23:29.770Z
Learning: In Fluent Bit core (fluent/fluent-bit repository), function descriptions/documentation are not required for newly added functions in header files.
Applied to files:
plugins/in_winevtlog/pack.c
📚 Learning: 2025-08-29T06:24:55.855Z
Learnt from: shadowshot-x
Repo: fluent/fluent-bit PR: 10794
File: src/aws/flb_aws_compress.c:52-56
Timestamp: 2025-08-29T06:24:55.855Z
Learning: ZSTD compression is always available in Fluent Bit and does not require conditional compilation guards. Unlike Arrow/Parquet which use #ifdef FLB_HAVE_ARROW guards, ZSTD is built unconditionally with flb_zstd.c included directly in src/CMakeLists.txt and a bundled ZSTD library at lib/zstd-1.5.7/.
Applied to files:
plugins/in_winevtlog/pack.c
📚 Learning: 2025-08-29T06:24:26.170Z
Learnt from: shadowshot-x
Repo: fluent/fluent-bit PR: 10794
File: tests/internal/aws_compress.c:39-42
Timestamp: 2025-08-29T06:24:26.170Z
Learning: In Fluent Bit, ZSTD compression support is enabled by default and does not require conditional compilation guards (like #ifdef FLB_HAVE_ZSTD) around ZSTD-related code declarations and implementations.
Applied to files:
plugins/in_winevtlog/pack.c
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- GitHub Check: pr-windows-build / call-build-windows-package (Windows 64bit, x64, x64-windows-static, 3.31.6)
- GitHub Check: pr-windows-build / call-build-windows-package (Windows 64bit (Arm64), amd64_arm64, -DCMAKE_SYSTEM_NAME=Windows -DCMA...
- GitHub Check: pr-windows-build / call-build-windows-package (Windows 32bit, x86, x86-windows-static, 3.31.6)
- GitHub Check: pr-compile-system-libs (-DFLB_PREFER_SYSTEM_LIBS=On, 3.31.6, gcc, g++, ubuntu-22.04, clang-12)
- GitHub Check: PR - fuzzing test
- GitHub Check: pr-compile-system-libs (-DFLB_PREFER_SYSTEM_LIBS=On, 3.31.6, clang, clang++, ubuntu-22.04, clang-12)
- GitHub Check: run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, 3.31.6, clang, clang++)
- GitHub Check: pr-compile-system-libs (-DFLB_PREFER_SYSTEM_LIBS=On, 3.31.6, clang, clang++, ubuntu-24.04, clang-14)
- GitHub Check: pr-compile-system-libs (-DFLB_PREFER_SYSTEM_LIBS=On, 3.31.6, gcc, g++, ubuntu-24.04, clang-14)
- GitHub Check: run-ubuntu-unit-tests (-DFLB_SIMD=On, 3.31.6, clang, clang++)
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- GitHub Check: run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, 3.31.6, clang, clang++)
- GitHub Check: run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, 3.31.6, clang, clang++)
- GitHub Check: pr-compile-without-cxx (3.31.6)
- GitHub Check: run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, 3.31.6, gcc, g++)
- GitHub Check: run-ubuntu-unit-tests (-DFLB_SIMD=Off, 3.31.6, gcc, g++)
- GitHub Check: run-ubuntu-unit-tests (-DFLB_COMPILER_STRICT_POINTER_TYPES=On, 3.31.6, gcc, g++)
- GitHub Check: run-ubuntu-unit-tests (-DFLB_SIMD=Off, 3.31.6, clang, clang++)
- GitHub Check: run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, 3.31.6, gcc, g++)
- GitHub Check: run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, 3.31.6, gcc, g++)
- GitHub Check: run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, 3.31.6, clang, clang++)
- GitHub Check: run-ubuntu-unit-tests (-DFLB_ARROW=On, 3.31.6, gcc, g++)
- GitHub Check: run-ubuntu-unit-tests (-DFLB_SMALL=On, 3.31.6, clang, clang++)
- GitHub Check: run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, 3.31.6, gcc, g++)
- GitHub Check: run-ubuntu-unit-tests (-DFLB_SMALL=On, 3.31.6, gcc, g++)
- GitHub Check: run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, 3.31.6, clang, clang++)
- GitHub Check: run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, 3.31.6, gcc, g++)
🔇 Additional comments (2)
plugins/in_winevtlog/pack.c (2)
304-325: Timezone offset calculation is correct.The sign inversion logic properly converts Windows bias (local→UTC) to ISO8601 offset (UTC→local). This should correctly produce
+0100for CET as required by the linked issue.
327-347: LGTM!The manual string formatting correctly produces the ISO8601-like timestamp with explicit timezone offset. The buffer size is adequate and error handling is present.
Signed-off-by: Hiroshi Hatake <hiroshi@chronosphere.io>
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With this patch, Fluent Bit can handle time zone offset changes at runtime across the different TimeZones: CET -> JST is also able to handle at runtime. |
This was referenced Dec 18, 2025
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Closes #11213.
There's DST/STD offset glitches under "TimeCreated" key's values.
This also should be handled with DynamicTimeZoneInformation related APIs.
This PR fixes this type of glitches.
Enter
[N/A]in the box, if an item is not applicable to your change.Testing
Before we can approve your change; please submit the following in a comment:
"TimeCreated"=>"2025-12-15 07:55:09 +0100"contains+0100offset now.If this is a change to packaging of containers or native binaries then please confirm it works for all targets.
ok-package-testlabel to test for all targets (requires maintainer to do).Documentation
Backporting
Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.
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