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minio/cmd/disk-cache-config.go
Anis Elleuch e8a008f5b5 Better validation of all config file fields ()
Add Validate() to serverConfig to call it at server
startup and in Admin SetConfig handler to minimize
errors scenario after server restart.
2018-07-18 11:22:29 -07:00

118 lines
3.1 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 (
"encoding/json"
"errors"
"path/filepath"
"strings"
"github.com/minio/minio/pkg/ellipses"
)
// CacheConfig represents cache config settings
type CacheConfig struct {
Drives []string `json:"drives"`
Expiry int `json:"expiry"`
MaxUse int `json:"maxuse"`
Exclude []string `json:"exclude"`
}
// UnmarshalJSON - implements JSON unmarshal interface for unmarshalling
// json entries for CacheConfig.
func (cfg *CacheConfig) UnmarshalJSON(data []byte) (err error) {
type Alias CacheConfig
var _cfg = &struct {
*Alias
}{
Alias: (*Alias)(cfg),
}
if err = json.Unmarshal(data, _cfg); err != nil {
return err
}
if _cfg.Expiry < 0 {
return errors.New("config expiry value should not be negative")
}
if _cfg.MaxUse < 0 {
return errors.New("config max use value should not be null or negative")
}
if _, err = parseCacheDrives(_cfg.Drives); err != nil {
return err
}
if _, err = parseCacheExcludes(_cfg.Exclude); err != nil {
return err
}
return nil
}
// Parses given cacheDrivesEnv and returns a list of cache drives.
func parseCacheDrives(drives []string) ([]string, error) {
if len(drives) == 0 {
return drives, nil
}
var endpoints []string
for _, d := range drives {
if ellipses.HasEllipses(d) {
s, err := parseCacheDrivePaths(d)
if err != nil {
return nil, err
}
endpoints = append(endpoints, s...)
} else {
endpoints = append(endpoints, d)
}
}
for _, d := range endpoints {
if !filepath.IsAbs(d) {
return nil, uiErrInvalidCacheDrivesValue(nil).Msg("cache dir should be absolute path: %s", d)
}
}
return endpoints, nil
}
// Parses all arguments and returns a slice of drive paths following the ellipses pattern.
func parseCacheDrivePaths(arg string) (ep []string, err error) {
patterns, perr := ellipses.FindEllipsesPatterns(arg)
if perr != nil {
return []string{}, uiErrInvalidCacheDrivesValue(nil).Msg(perr.Error())
}
for _, lbls := range patterns.Expand() {
ep = append(ep, strings.Join(lbls, ""))
}
return ep, nil
}
// Parses given cacheExcludesEnv and returns a list of cache exclude patterns.
func parseCacheExcludes(excludes []string) ([]string, error) {
for _, e := range excludes {
if len(e) == 0 {
return nil, uiErrInvalidCacheExcludesValue(nil).Msg("cache exclude path (%s) cannot be empty", e)
}
if hasPrefix(e, slashSeparator) {
return nil, uiErrInvalidCacheExcludesValue(nil).Msg("cache exclude pattern (%s) cannot start with / as prefix", e)
}
}
return excludes, nil
}