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errors.go
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errors.go
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/*
* Copyright (C) 2023 Intergral GmbH
*
* This program 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.
*
* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
package util
import (
"bytes"
"errors"
"fmt"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
var (
// ErrSnapshotNotFound can be used when we don't find a snapshot
ErrSnapshotNotFound = errors.New("snaplshot not found")
// ErrSearchKeyValueNotFound is used to indicate the requested key/value pair was not found.
ErrSearchKeyValueNotFound = errors.New("key/value not found")
ErrUnsupported = fmt.Errorf("unsupported")
)
// The MultiError type implements the error interface, and contains the
// Errors used to construct it.
type MultiError []error
// Returns a concatenated string of the contained errors
func (es MultiError) Error() string {
var buf bytes.Buffer
if len(es) > 1 {
_, _ = fmt.Fprintf(&buf, "%d errors: ", len(es))
}
for i, err := range es {
if i != 0 {
buf.WriteString("; ")
}
buf.WriteString(err.Error())
}
return buf.String()
}
// Add adds the error to the error list if it is not nil.
func (es *MultiError) Add(err error) {
if err == nil {
return
}
if merr, ok := err.(MultiError); ok {
*es = append(*es, merr...)
} else {
*es = append(*es, err)
}
}
// Err returns the error list as an error or nil if it is empty.
func (es MultiError) Err() error {
if len(es) == 0 {
return nil
}
return es
}
// IsConnCanceled returns true, if error is from a closed gRPC connection.
// copied from https://github.com/etcd-io/etcd/blob/7f47de84146bdc9225d2080ec8678ca8189a2d2b/clientv3/client.go#L646
func IsConnCanceled(err error) bool {
if err == nil {
return false
}
// >= gRPC v1.23.x
s, ok := status.FromError(err)
if ok {
// connection is canceled or server has already closed the connection
return s.Code() == codes.Canceled || s.Message() == "transport is closing"
}
return false
}