mirror of https://github.com/minio/minio.git
87 lines
2.6 KiB
Go
87 lines
2.6 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"context"
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"errors"
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"fmt"
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etcd "go.etcd.io/etcd/v3/clientv3"
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)
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var errEtcdUnreachable = errors.New("etcd is unreachable, please check your endpoints")
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func etcdErrToErr(err error, etcdEndpoints []string) error {
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if err == nil {
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return nil
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}
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switch err {
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case context.DeadlineExceeded:
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return fmt.Errorf("%w %s", errEtcdUnreachable, etcdEndpoints)
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default:
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return fmt.Errorf("unexpected error %w from etcd, please check your endpoints %s", err, etcdEndpoints)
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}
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}
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func saveKeyEtcdWithTTL(ctx context.Context, client *etcd.Client, key string, data []byte, ttl int64) error {
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timeoutCtx, cancel := context.WithTimeout(ctx, defaultContextTimeout)
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defer cancel()
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lease, err := client.Grant(timeoutCtx, ttl)
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if err != nil {
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return etcdErrToErr(err, client.Endpoints())
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}
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_, err = client.Put(timeoutCtx, key, string(data), etcd.WithLease(lease.ID))
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return etcdErrToErr(err, client.Endpoints())
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}
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func saveKeyEtcd(ctx context.Context, client *etcd.Client, key string, data []byte, opts ...options) error {
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timeoutCtx, cancel := context.WithTimeout(ctx, defaultContextTimeout)
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defer cancel()
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if len(opts) > 0 {
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return saveKeyEtcdWithTTL(ctx, client, key, data, opts[0].ttl)
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}
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_, err := client.Put(timeoutCtx, key, string(data))
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return etcdErrToErr(err, client.Endpoints())
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}
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func deleteKeyEtcd(ctx context.Context, client *etcd.Client, key string) error {
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timeoutCtx, cancel := context.WithTimeout(ctx, defaultContextTimeout)
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defer cancel()
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_, err := client.Delete(timeoutCtx, key)
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return etcdErrToErr(err, client.Endpoints())
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}
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func readKeyEtcd(ctx context.Context, client *etcd.Client, key string) ([]byte, error) {
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timeoutCtx, cancel := context.WithTimeout(ctx, defaultContextTimeout)
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defer cancel()
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resp, err := client.Get(timeoutCtx, key)
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if err != nil {
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return nil, etcdErrToErr(err, client.Endpoints())
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}
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if resp.Count == 0 {
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return nil, errConfigNotFound
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}
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for _, ev := range resp.Kvs {
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if string(ev.Key) == key {
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return ev.Value, nil
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}
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}
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return nil, errConfigNotFound
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}
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