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timeout_reader.go
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timeout_reader.go
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/*
* Copyright (c) 2019-2021. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package brokerlog
import (
"bufio"
"errors"
"io"
"runtime"
"time"
)
const bufferSize = 4096
var ErrTimeout = errors.New("natslog: read timeout")
type timeoutReader struct {
b *bufio.Reader
t time.Time
ch <-chan error
closeFunc func() error
}
func newTimeoutReader(r io.ReadCloser) *timeoutReader {
return &timeoutReader{
b: bufio.NewReaderSize(r, bufferSize),
closeFunc: func() error { return r.Close() },
}
}
// SetDeadline sets the deadline for all future Read calls.
func (r *timeoutReader) SetDeadline(t time.Time) {
r.t = t
}
func (r *timeoutReader) Read(b []byte) (n int, err error) {
if r.ch == nil {
if r.t.IsZero() || r.b.Buffered() > 0 {
return r.b.Read(b)
}
ch := make(chan error, 1)
r.ch = ch
go func() {
_, err := r.b.Peek(1)
ch <- err
}()
runtime.Gosched()
}
if r.t.IsZero() {
err = <-r.ch // Block
} else {
select {
case err = <-r.ch: // Poll
default:
select {
case err = <-r.ch: // Timeout
case <-time.After(time.Until(r.t)):
return 0, ErrTimeout
}
}
}
r.ch = nil
if r.b.Buffered() > 0 {
n, _ = r.b.Read(b)
}
return
}
func (r *timeoutReader) Close() error {
return r.closeFunc()
}