go get github.com/Mexican-Man/log-manager

There are lots of good log rotators out there, but I couldn't find one that gave me the granularity/number of features that I needed. So, I've compiled features from other log rotating packages into this one. If you think it's missing a feature, please open an issue or PR.

import (
    lm "github.com/Mexican-Man/log-manager"
)

manager := lm.NewLogManager(lm.LogManagerOptions{
    Dir:              "/path/to/logs",
    RotationInterval: time.Hour * 24,
})

log.SetOutput(manager)

• *Dir — Directory to store logs in
• *RotationInterval — How often to rotate logs (0 disables it)
• FilenameFormat — Template string using text/template (more info below)
• MaxFileSize — How large a file can get before its rotated (0 for no limit)
• GZIP — GZIP old logs
• LatestDotLog — Keeps a symlink called latest that points to the latest log

Here's the templated struct format:

type LogTemplate struct {
	Time      time.Time
	Iteration uint
}

When rotating, Interation will increase if another log with the same name already exists. If increasing the iteration does not solve the issue, it will throw an error, and continue writing to the old log.

Here's the default, if not defined in LogManagerOptions{}:

{{ .Time.Format "2006-01-02" }}_{{ .Iteration }}.log

This will print create logs like this:

• 2022-05-17_0.log
• 2022-05-17_1.log
• 2022-05-18_0.log

Here's another example:

{{ .Time.Format "2006-01-02" }}{{ if .Iteration }}_{{ .Iteration }}{{ end }}.log

This will print create logs like this:

• 2022-05-17.log
• 2022-05-17_1.log
• 2022-05-18.log

Note that the date format is the Go's standard date formatting.

You can set RotationInterval to indicate when your logs should rotate. For example, a RotationInterval of

time.Hour * 24

would ensure that logs are rotated everyday, at midnight. A RotationInterval of

time.Hour * 12

would ensure that logs are rotated everyday, at midnight and noon.