134 lines
3.8 KiB
Go
134 lines
3.8 KiB
Go
/*
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* Minio Cloud Storage, (C) 2018 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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"bytes"
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"context"
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"errors"
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etcd "github.com/coreos/etcd/clientv3"
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"github.com/minio/minio/cmd/logger"
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"github.com/minio/minio/pkg/hash"
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)
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var errConfigNotFound = errors.New("config file not found")
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func readConfig(ctx context.Context, objAPI ObjectLayer, configFile string) ([]byte, error) {
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var buffer bytes.Buffer
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// Read entire content by setting size to -1
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if err := objAPI.GetObject(ctx, minioMetaBucket, configFile, 0, -1, &buffer, "", ObjectOptions{}); err != nil {
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// Treat object not found as config not found.
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if isErrObjectNotFound(err) {
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return nil, errConfigNotFound
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}
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logger.GetReqInfo(ctx).AppendTags("configFile", configFile)
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logger.LogIf(ctx, err)
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return nil, err
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}
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// Return config not found on empty content.
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if buffer.Len() == 0 {
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return nil, errConfigNotFound
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}
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return buffer.Bytes(), nil
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}
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func deleteConfigEtcd(ctx context.Context, client *etcd.Client, configFile string) error {
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_, err := client.Delete(ctx, configFile)
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return err
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}
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func deleteConfig(ctx context.Context, objAPI ObjectLayer, configFile string) error {
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return objAPI.DeleteObject(ctx, minioMetaBucket, configFile)
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}
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func saveConfigEtcd(ctx context.Context, client *etcd.Client, configFile string, data []byte) error {
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_, err := client.Put(ctx, configFile, string(data))
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return err
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}
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func saveConfig(ctx context.Context, objAPI ObjectLayer, configFile string, data []byte) error {
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hashReader, err := hash.NewReader(bytes.NewReader(data), int64(len(data)), "", getSHA256Hash(data), int64(len(data)))
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if err != nil {
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return err
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}
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_, err = objAPI.PutObject(ctx, minioMetaBucket, configFile, hashReader, nil, ObjectOptions{})
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return err
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}
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func readConfigEtcd(ctx context.Context, client *etcd.Client, configFile string) ([]byte, error) {
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resp, err := client.Get(ctx, configFile)
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if err != nil {
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return nil, err
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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) == configFile {
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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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// watchConfig - watches for changes on `configFile` on etcd and loads them.
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func watchConfig(objAPI ObjectLayer, configFile string, loadCfgFn func(ObjectLayer) error) {
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if globalEtcdClient != nil {
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for watchResp := range globalEtcdClient.Watch(context.Background(), configFile) {
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for _, event := range watchResp.Events {
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if event.IsModify() || event.IsCreate() {
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loadCfgFn(objAPI)
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}
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}
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}
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}
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}
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func checkConfigEtcd(ctx context.Context, client *etcd.Client, configFile string) error {
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resp, err := globalEtcdClient.Get(ctx, configFile)
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if err != nil {
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return err
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}
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if resp.Count == 0 {
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return errConfigNotFound
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}
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return nil
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}
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func checkConfig(ctx context.Context, objAPI ObjectLayer, configFile string) error {
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if globalEtcdClient != nil {
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return checkConfigEtcd(ctx, globalEtcdClient, configFile)
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}
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if _, err := objAPI.GetObjectInfo(ctx, minioMetaBucket, configFile, ObjectOptions{}); err != nil {
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// Treat object not found as config not found.
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if isErrObjectNotFound(err) {
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return errConfigNotFound
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}
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logger.GetReqInfo(ctx).AppendTags("configFile", configFile)
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logger.LogIf(ctx, err)
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return err
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}
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return nil
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}
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