minio/cmd/disk-cache-config.go

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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 (
"encoding/json"
"path/filepath"
)
// CacheConfig represents cache config settings
type CacheConfig struct {
Drives []string `json:"drives"`
Expiry int `json:"expiry"`
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 _, 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) {
for _, d := range drives {
if !filepath.IsAbs(d) {
return nil, uiErrInvalidCacheDrivesValue(nil).Msg("cache dir should be absolute path: %s", d)
}
}
return drives, 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
}