mirror of
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93 lines
2.9 KiB
Go
93 lines
2.9 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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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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"github.com/minio/minio/internal/logger"
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etcd "go.etcd.io/etcd/client/v3"
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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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logger.LogIf(ctx, err)
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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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logger.LogIf(ctx, err)
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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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logger.LogIf(ctx, err)
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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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logger.LogOnceIf(ctx, err, "etcd-retrieve-keys")
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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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