minio/cmd/config.go
Harshavardhana 0e02328c98 Migrate config.json from config-dir to backend (#6195)
This PR is the first set of changes to move the config
to the backend, the changes use the existing `config.json`
allows it to be migrated such that we can save it in on
backend disks.

In future releases, we will slowly migrate out of the
current architecture.

Fixes #6182
2018-08-15 10:11:47 +05:30

262 lines
7.2 KiB
Go

/*
* 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"
"encoding/json"
"errors"
"io"
"io/ioutil"
"path"
"runtime"
"time"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/hash"
"github.com/minio/minio/pkg/quick"
)
const (
minioConfigPrefix = "config"
// Minio configuration file.
minioConfigFile = "config.json"
)
func saveServerConfig(objAPI ObjectLayer, config *serverConfig) error {
if err := quick.CheckData(config); err != nil {
return err
}
data, err := json.Marshal(config)
if err != nil {
return err
}
configFile := path.Join(minioConfigPrefix, minioConfigFile)
if globalEtcdClient != nil {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
_, err := globalEtcdClient.Put(ctx, configFile, string(data))
defer cancel()
return err
}
return saveConfig(objAPI, configFile, data)
}
func readConfigEtcd(configFile string) ([]byte, error) {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
resp, err := globalEtcdClient.Get(ctx, configFile)
defer cancel()
if err != nil {
return nil, err
}
if resp.Count == 0 {
return nil, errConfigNotFound
}
for _, ev := range resp.Kvs {
if string(ev.Key) == configFile {
return ev.Value, nil
}
}
return nil, errConfigNotFound
}
func readServerConfig(ctx context.Context, objAPI ObjectLayer) (*serverConfig, error) {
var configData []byte
var err error
configFile := path.Join(minioConfigPrefix, minioConfigFile)
if globalEtcdClient != nil {
configData, err = readConfigEtcd(configFile)
} else {
var reader io.Reader
reader, err = readConfig(ctx, objAPI, configFile)
if err != nil {
return nil, err
}
configData, err = ioutil.ReadAll(reader)
}
if err != nil {
return nil, err
}
if runtime.GOOS == "windows" {
configData = bytes.Replace(configData, []byte("\r\n"), []byte("\n"), -1)
}
if err = quick.CheckDuplicateKeys(string(configData)); err != nil {
return nil, err
}
var config = &serverConfig{}
if err := json.Unmarshal(configData, config); err != nil {
return nil, err
}
if err := quick.CheckData(config); err != nil {
return nil, err
}
return config, nil
}
func checkServerConfigEtcd(configFile string) error {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
resp, err := globalEtcdClient.Get(ctx, configFile)
defer cancel()
if err != nil {
return err
}
if resp.Count == 0 {
return errConfigNotFound
}
return nil
}
func checkServerConfig(ctx context.Context, objAPI ObjectLayer) error {
configFile := path.Join(minioConfigPrefix, minioConfigFile)
if globalEtcdClient != nil {
return checkServerConfigEtcd(configFile)
}
if _, err := objAPI.GetObjectInfo(ctx, minioMetaBucket, configFile); err != nil {
if isErrObjectNotFound(err) {
return errConfigNotFound
}
logger.GetReqInfo(ctx).AppendTags("configFile", configFile)
logger.LogIf(ctx, err)
return err
}
return nil
}
func saveConfig(objAPI ObjectLayer, configFile string, data []byte) error {
hashReader, err := hash.NewReader(bytes.NewReader(data), int64(len(data)), "", getSHA256Hash(data))
if err != nil {
return err
}
_, err = objAPI.PutObject(context.Background(), minioMetaBucket, configFile, hashReader, nil)
return err
}
var errConfigNotFound = errors.New("config file not found")
func readConfig(ctx context.Context, objAPI ObjectLayer, configFile string) (*bytes.Buffer, error) {
var buffer bytes.Buffer
// Read entire content by setting size to -1
if err := objAPI.GetObject(ctx, minioMetaBucket, configFile, 0, -1, &buffer, ""); err != nil {
// Ignore if err is ObjectNotFound or IncompleteBody when bucket is not configured with notification
if isErrObjectNotFound(err) || isErrIncompleteBody(err) || isInsufficientReadQuorum(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, nil
}
// ConfigSys - config system.
type ConfigSys struct{}
// Load - load config.json.
func (sys *ConfigSys) Load(objAPI ObjectLayer) error {
return sys.Init(objAPI)
}
// Init - initializes config system from config.json.
func (sys *ConfigSys) Init(objAPI ObjectLayer) error {
if objAPI == nil {
return errInvalidArgument
}
return loadConfig(objAPI)
}
// NewConfigSys - creates new config system object.
func NewConfigSys() *ConfigSys {
return &ConfigSys{}
}
// Migrates ${HOME}/.minio/config.json to '<export_path>/.minio.sys/config/minio.json'
func migrateConfigToMinioSys() error {
// Construct path to config.json for the given bucket.
configFile := path.Join(bucketConfigPrefix, minioConfigFile)
transactionConfigFile := configFile + ".transaction"
// As object layer's GetObject() and PutObject() take respective lock on minioMetaBucket
// and configFile, take a transaction lock to avoid race.
objLock := globalNSMutex.NewNSLock(minioMetaBucket, transactionConfigFile)
if err := objLock.GetLock(globalOperationTimeout); err != nil {
return err
}
defer objLock.Unlock()
// Verify if backend already has the file.
if err := checkServerConfig(context.Background(), newObjectLayerFn()); err != errConfigNotFound {
return err
} // if errConfigNotFound proceed to migrate..
var config = &serverConfig{}
if _, err := Load(getConfigFile(), config); err != nil {
return err
}
return saveServerConfig(newObjectLayerFn(), config)
}
// Initialize and load config from remote etcd or local config directory
func initConfig() {
if globalEtcdClient != nil {
ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
resp, err := globalEtcdClient.Get(ctx, getConfigFile())
cancel()
if err == nil && resp.Count > 0 {
logger.FatalIf(migrateConfig(), "Config migration failed")
}
} else {
if isFile(getConfigFile()) {
logger.FatalIf(migrateConfig(), "Config migration failed")
// Migrates ${HOME}/.minio/config.json to '<export_path>/.minio.sys/config/config.json'
if err := migrateConfigToMinioSys(); err != nil {
logger.Fatal(err, "Unable to migrate 'config.json' to '.minio.sys/config/config.json'")
}
}
}
if err := checkServerConfig(context.Background(), newObjectLayerFn()); err != nil {
if err == errConfigNotFound {
// Config file does not exist, we create it fresh and return upon success.
logger.FatalIf(newConfig(newObjectLayerFn()), "Unable to initialize minio config for the first time")
logger.Info("Created minio configuration file successfully at " + getConfigDir())
} else {
logger.FatalIf(err, "Unable to load the configuration file")
}
}
logger.FatalIf(loadConfig(newObjectLayerFn()), "Unable to load the configuration file")
}