* glog: add JSON structured logging mode
Add opt-in JSON output format for glog, enabling integration with
log aggregation systems like ELK, Loki, and Datadog.
- Add --log_json flag to enable JSON output at startup
- Add SetJSONMode()/IsJSONMode() for runtime toggle
- Add JSON branches in println, printDepth, printf, printWithFileLine
- Use manual JSON construction (no encoding/json) for performance
- Add jsonEscapeString() for safe string escaping
- Include 8 unit tests and 1 benchmark
Enabled via --log_json flag. Default behavior unchanged.
* glog: prevent lazy flag init from overriding SetJSONMode
If --log_json=true and SetJSONMode(false) was called at runtime,
a subsequent IsJSONMode() call would re-enable JSON mode via the
sync.Once lazy initialization. Mark jsonFlagOnce as done inside
SetJSONMode so the runtime API always takes precedence.
* glog: fix RuneError check to not misclassify valid U+FFFD
The condition r == utf8.RuneError matches both invalid UTF-8
sequences (size=1) and a valid U+FFFD replacement character
(size=3). Without checking size == 1, a valid U+FFFD input
would be incorrectly escaped and only advance by 1 byte,
corrupting the output.
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Co-authored-by: Chris Lu <chris.lu@gmail.com>
* glog: add gzip compression for rotated log files
Add opt-in gzip compression that automatically compresses log files
after rotation, reducing disk usage in long-running deployments.
- Add --log_compress flag to enable compression at startup
- Add SetCompressRotated()/IsCompressRotated() for runtime toggle
- Compress rotated files in background goroutine (non-blocking)
- Use gzip.BestSpeed for minimal CPU overhead
- Fix .gz file cleanup: TrimSuffix approach correctly counts
compressed files toward MaxFileCount limit
- Include 6 unit tests covering normal, empty, large, and edge cases
Enabled via --log_compress flag. Default behavior unchanged.
* glog: fix compressFile to check gz/dst close errors and use atomic rename
Write to a temp file (.gz.tmp) and rename atomically to prevent
exposing partial archives. Check gz.Close() and dst.Close() errors
to avoid deleting the original log when flush fails (e.g. ENOSPC).
Use defer for robust resource cleanup.
* glog: deduplicate .log/.log.gz pairs in rotation cleanup
During concurrent compression, both foo.log and foo.log.gz can exist
simultaneously. Count them as one entry against MaxFileCount to prevent
premature eviction of rotated logs.
* glog: use portable temp path in TestCompressFile_NonExistent
Replace hardcoded /nonexistent/path with t.TempDir() for portability.
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Co-authored-by: Copilot <copilot@github.com>
* glog: add --log_rotate_hours flag for time-based log rotation
SeaweedFS previously only rotated log files when they reached MaxSize
(1.8 GB). Long-running deployments with low log volume could accumulate
log files indefinitely with no way to force rotation on a schedule.
This change adds the --log_rotate_hours flag. When set to a non-zero
value, the current log file is rotated once it has been open for the
specified number of hours, regardless of its size.
Implementation details:
- New flag --log_rotate_hours (int, default 0 = disabled) in glog_file.go
- Added createdAt time.Time field to syncBuffer to track file open time
- rotateFile() sets createdAt to the time the new file is opened
- Write() checks elapsed time and triggers rotation when the threshold
is exceeded, consistent with the existing size-based check
This resolves the long-standing request for time-based rotation and
helps prevent unbounded log accumulation in /tmp on production systems.
Related: #3455, #5763, #8336
* glog: default log_rotate_hours to 168 (7 days)
Enable time-based rotation by default so log files don't accumulate
indefinitely in long-running deployments. Set to 0 to disable.
* glog: simplify rotation logic by combining size and time conditions
Merge the two separate rotation checks into a single block to
eliminate duplicated rotateFile error handling.
* glog: use timeNow() in syncBuffer.Write and add time-based rotation test
Use the existing testable timeNow variable instead of time.Now() in
syncBuffer.Write so that time-based rotation can be tested with a
mocked clock.
Add TestTimeBasedRollover that verifies:
- no rotation occurs before the interval elapses
- rotation triggers after the configured hours
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Co-authored-by: Copilot <copilot@github.com>
