45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
|
package engine
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"os"
|
||
|
|
"path/filepath"
|
||
|
|
|
||
|
|
"github.com/rogpeppe/go-internal/lockedfile"
|
||
|
|
)
|
||
|
|
|
||
|
|
// KVStore is a simple, atomic key-value store. The user of
|
||
|
|
// probe-engine should supply an implementation of this interface,
|
||
|
|
// which will be used by probe-engine to store specific data.
|
||
|
|
type KVStore interface {
|
||
|
|
Get(key string) (value []byte, err error)
|
||
|
|
Set(key string, value []byte) (err error)
|
||
|
|
}
|
||
|
|
|
||
|
|
// FileSystemKVStore is a directory based KVStore
|
||
|
|
type FileSystemKVStore struct {
|
||
|
|
basedir string
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewFileSystemKVStore creates a new FileSystemKVStore.
|
||
|
|
func NewFileSystemKVStore(basedir string) (kvs *FileSystemKVStore, err error) {
|
||
|
|
if err = os.MkdirAll(basedir, 0700); err == nil {
|
||
|
|
kvs = &FileSystemKVStore{basedir: basedir}
|
||
|
|
}
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (kvs *FileSystemKVStore) filename(key string) string {
|
||
|
|
return filepath.Join(kvs.basedir, key)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Get returns the specified key's value
|
||
|
|
func (kvs *FileSystemKVStore) Get(key string) ([]byte, error) {
|
||
|
|
return lockedfile.Read(kvs.filename(key))
|
||
|
|
}
|
||
|
|
|
||
|
|
// Set sets the value of a specific key
|
||
|
|
func (kvs *FileSystemKVStore) Set(key string, value []byte) error {
|
||
|
|
return lockedfile.Write(kvs.filename(key), bytes.NewReader(value), 0600)
|
||
|
|
}
|