forked from ProtonMail/proton-bridge
/
rotator.go
75 lines (60 loc) · 1.51 KB
/
rotator.go
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// Copyright (c) 2021 Proton Technologies AG
//
// This file is part of ProtonMail Bridge.
//
// ProtonMail Bridge is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// ProtonMail Bridge is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>.
package logging
import "io"
type Rotator struct {
getFile FileProvider
wc io.WriteCloser
size int
maxSize int
}
type FileProvider func() (io.WriteCloser, error)
func NewRotator(maxSize int, getFile FileProvider) (*Rotator, error) {
r := &Rotator{
getFile: getFile,
maxSize: maxSize,
}
if err := r.rotate(); err != nil {
return nil, err
}
return r, nil
}
func (r *Rotator) Write(p []byte) (int, error) {
if r.size+len(p) > r.maxSize {
if err := r.rotate(); err != nil {
return 0, err
}
}
n, err := r.wc.Write(p)
if err != nil {
return n, err
}
r.size += n
return n, nil
}
func (r *Rotator) rotate() error {
if r.wc != nil {
_ = r.wc.Close()
}
wc, err := r.getFile()
if err != nil {
return err
}
r.wc = wc
r.size = 0
return nil
}