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75 lines
1.5 KiB
75 lines
1.5 KiB
// Copyright (c) 2022 Proton Technologies AG |
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// |
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// This file is part of ProtonMail Bridge. |
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// |
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// ProtonMail Bridge is free software: you can redistribute it and/or modify |
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// it under the terms of the GNU General Public License as published by |
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// the Free Software Foundation, either version 3 of the License, or |
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// (at your option) any later version. |
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// |
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// ProtonMail Bridge is distributed in the hope that it will be useful, |
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// but WITHOUT ANY WARRANTY; without even the implied warranty of |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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// GNU General Public License for more details. |
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// |
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// You should have received a copy of the GNU General Public License |
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// along with ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>. |
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package logging |
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import "io" |
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type Rotator struct { |
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getFile FileProvider |
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wc io.WriteCloser |
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size int |
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maxSize int |
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} |
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type FileProvider func() (io.WriteCloser, error) |
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func NewRotator(maxSize int, getFile FileProvider) (*Rotator, error) { |
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r := &Rotator{ |
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getFile: getFile, |
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maxSize: maxSize, |
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} |
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if err := r.rotate(); err != nil { |
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return nil, err |
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} |
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return r, nil |
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} |
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func (r *Rotator) Write(p []byte) (int, error) { |
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if r.size+len(p) > r.maxSize { |
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if err := r.rotate(); err != nil { |
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return 0, err |
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} |
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} |
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n, err := r.wc.Write(p) |
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if err != nil { |
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return n, err |
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} |
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r.size += n |
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return n, nil |
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} |
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func (r *Rotator) rotate() error { |
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if r.wc != nil { |
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_ = r.wc.Close() |
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} |
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wc, err := r.getFile() |
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if err != nil { |
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return err |
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} |
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r.wc = wc |
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r.size = 0 |
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return nil |
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}
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