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Copy pathconfig-common.go
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151 lines (132 loc) · 4.89 KB
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/*
* Minio Cloud Storage, (C) 2018 Minio, Inc.
*
* 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 cmd
import (
"bytes"
"context"
"errors"
"fmt"
etcd "github.com/coreos/etcd/clientv3"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/hash"
)
var errConfigNotFound = errors.New("config file not found")
func readConfig(ctx context.Context, objAPI ObjectLayer, configFile string) ([]byte, error) {
var buffer bytes.Buffer
// Read entire content by setting size to -1
if err := objAPI.GetObject(ctx, minioMetaBucket, configFile, 0, -1, &buffer, "", ObjectOptions{}); err != nil {
// Treat object not found as config not found.
if isErrObjectNotFound(err) {
return nil, errConfigNotFound
}
logger.GetReqInfo(ctx).AppendTags("configFile", configFile)
logger.LogIf(ctx, err)
return nil, err
}
// Return config not found on empty content.
if buffer.Len() == 0 {
return nil, errConfigNotFound
}
return buffer.Bytes(), nil
}
func deleteConfigEtcd(ctx context.Context, client *etcd.Client, configFile string) error {
_, err := client.Delete(ctx, configFile)
return err
}
func deleteConfig(ctx context.Context, objAPI ObjectLayer, configFile string) error {
return objAPI.DeleteObject(ctx, minioMetaBucket, configFile)
}
func saveConfigEtcd(ctx context.Context, client *etcd.Client, configFile string, data []byte) error {
timeoutCtx, cancel := context.WithTimeout(ctx, defaultContextTimeout)
defer cancel()
_, err := client.Put(timeoutCtx, configFile, string(data))
if err == context.DeadlineExceeded {
return fmt.Errorf("etcd setup is unreachable, please check your endpoints %s", client.Endpoints())
} else if err != nil {
return fmt.Errorf("unexpected error %s returned by etcd setup, please check your endpoints %s", err, client.Endpoints())
}
return nil
}
func saveConfig(ctx context.Context, objAPI ObjectLayer, configFile string, data []byte) error {
hashReader, err := hash.NewReader(bytes.NewReader(data), int64(len(data)), "", getSHA256Hash(data), int64(len(data)))
if err != nil {
return err
}
_, err = objAPI.PutObject(ctx, minioMetaBucket, configFile, NewPutObjReader(hashReader, nil, nil), ObjectOptions{})
return err
}
func readConfigEtcd(ctx context.Context, client *etcd.Client, configFile string) ([]byte, error) {
timeoutCtx, cancel := context.WithTimeout(ctx, defaultContextTimeout)
defer cancel()
resp, err := client.Get(timeoutCtx, configFile)
if err != nil {
if err == context.DeadlineExceeded {
return nil, fmt.Errorf("etcd setup is unreachable, please check your endpoints %s", client.Endpoints())
}
return nil, fmt.Errorf("unexpected error %s returned by etcd setup, please check your endpoints %s", err, client.Endpoints())
}
if resp.Count == 0 {
return nil, errConfigNotFound
}
for _, ev := range resp.Kvs {
if string(ev.Key) == configFile {
return ev.Value, nil
}
}
return nil, errConfigNotFound
}
// watchConfigEtcd - watches for changes on `configFile` on etcd and loads them.
func watchConfigEtcd(objAPI ObjectLayer, configFile string, loadCfgFn func(ObjectLayer) error) {
ctx, cancel := context.WithTimeout(context.Background(), defaultContextTimeout)
defer cancel()
for watchResp := range globalEtcdClient.Watch(ctx, configFile) {
for _, event := range watchResp.Events {
if event.IsModify() || event.IsCreate() {
loadCfgFn(objAPI)
}
}
}
}
func checkConfigEtcd(ctx context.Context, client *etcd.Client, configFile string) error {
timeoutCtx, cancel := context.WithTimeout(ctx, defaultContextTimeout)
defer cancel()
resp, err := client.Get(timeoutCtx, configFile)
if err != nil {
if err == context.DeadlineExceeded {
return fmt.Errorf("etcd setup is unreachable, please check your endpoints %s", client.Endpoints())
}
return fmt.Errorf("unexpected error %s returned by etcd setup, please check your endpoints %s", err, client.Endpoints())
}
if resp.Count == 0 {
return errConfigNotFound
}
return nil
}
func checkConfig(ctx context.Context, objAPI ObjectLayer, configFile string) error {
if globalEtcdClient != nil {
return checkConfigEtcd(ctx, globalEtcdClient, configFile)
}
if _, err := objAPI.GetObjectInfo(ctx, minioMetaBucket, configFile, ObjectOptions{}); err != nil {
// Treat object not found as config not found.
if isErrObjectNotFound(err) {
return errConfigNotFound
}
logger.GetReqInfo(ctx).AppendTags("configFile", configFile)
logger.LogIf(ctx, err)
return err
}
return nil
}