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retry.go
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retry.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 model
import (
"context"
"fmt"
"time"
)
// Retry tries to apply an operation as many time as required
func Retry(f func() error, seconds ...time.Duration) error {
if e := f(); e == nil {
return nil
}
tickerTime := 1 * time.Second
timeout := time.After(30 * time.Second)
if len(seconds) == 2 {
tickerTime = seconds[0]
timeout = time.After(seconds[1])
} else if len(seconds) == 1 {
tickerTime = seconds[0]
}
ticker := time.NewTicker(tickerTime)
defer ticker.Stop()
var lastErr error
for {
select {
case <-ticker.C:
if lastErr = f(); lastErr == nil {
return nil
}
case <-timeout:
if lastErr != nil {
return lastErr
} else {
return fmt.Errorf("timeout")
}
}
}
}
// RetryWithCtx does like Retry with an additionnal cancellable context
func RetryWithCtx(ctx context.Context, f func(retry int) error, seconds ...time.Duration) error {
i := 0
if e := f(i); e == nil {
return nil
}
timeout := time.After(30 * time.Second)
tickerTime := 1 * time.Second
if len(seconds) == 2 {
tickerTime = seconds[0]
timeout = time.After(seconds[1])
} else if len(seconds) == 1 {
tickerTime = seconds[0]
}
ticker := time.NewTicker(tickerTime)
defer ticker.Stop()
var lastErr error
for {
select {
case <-ticker.C:
if lastErr = f(i); lastErr == nil {
return nil
}
i++
case <-timeout:
if lastErr != nil {
return lastErr
} else {
return fmt.Errorf("timeout")
}
case <-ctx.Done():
if lastErr != nil {
return lastErr
} else {
return ctx.Err()
}
}
}
}