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retryableerror.go
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/
retryableerror.go
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// Copyright Project Contour Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package retryableerror
import (
"time"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
)
// Error represents an error for an operation that should be retried after the
// specified duration.
type Error interface {
error
// After is the time period after which the operation that caused the
// error should be retried.
After() time.Duration
}
// New returns a new RetryableError with the given error and time period.
func New(err error, after time.Duration) Error {
return retryableError{err, after}
}
type retryableError struct {
error
after time.Duration
}
// After returns the time period after which the operation that caused the error
// should be retried.
func (r retryableError) After() time.Duration {
return r.after
}
// NewMaybeRetryableAggregate converts a slice of errors into a single error
// value. Nil values will be filtered from the slice. If the filtered slice is
// empty, the return value will be nil. Else, if any values are non-retryable
// errors, the result will be an Aggregate interface. Else, if all errors are
// retryable, the result will be a retryable Error interface, with After() equal
// to the minimum of all the errors' After() values.
func NewMaybeRetryableAggregate(errs []error) error {
aggregate := utilerrors.NewAggregate(errs)
if aggregate == nil {
return nil
}
afterHasInitialValue := false
var after time.Duration
for _, err := range aggregate.Errors() {
switch e := err.(type) {
case Error:
if !afterHasInitialValue || e.After() < after {
after = e.After()
}
afterHasInitialValue = true
default:
return aggregate
}
}
return New(aggregate, after)
}