barrel

barrel provides a rolling writer which can be used as an io.Writer when the underlying writer may change.

Usage

barrel can be used at any place where some changing io.Writer is needed.

Files

barrel can be used with package barrel/barrelfile to write rolling files, where the underlying file vary according to some trigger.

file, _ := os.OpenFile("/path/to/file", os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)

rollingWriter := barrel.RollingWriter{
    Writer: file,
    Trigger: barrelfile.TriggerAdapter{
        FileTrigger: barrelfile.SizeBasedTrigger{Size: 1 * 1e3 * 1e3}, // 1 MB
    },
    Rotator: barrelfile.RotatorAdapter{
        FileRotator: barrelfile.TransformRotator{
            Transformers: []barrelfile.Transformer{
                barrelfile.RenameTransformer{
                    Namer: barrelfile.TimestampSequenceNamer{},
                },
                barrelfile.GzipTransformer{
                    GzipLevel: gzip.DefaultCompression,
                },
            },
            Rotator: barrelfile.IdentityRotator{},
        },
        OpenFlag: os.O_WRONLY | os.O_CREATE | os.O_APPEND,
    },
}

_, _ = rollingWriter.Write([]byte("hello world"))
defer func() { _ = rollingWriter.Close() }()