/
message.go
86 lines (68 loc) · 1.59 KB
/
message.go
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package storage
import (
"github.com/mylxsw/coll"
"github.com/siddontang/ledisdb/ledis"
)
const (
MessageErrorType = "errors"
)
type MessageFactory interface {
MessageStore(name string) MessageStore
}
type messageFactory struct {
db *ledis.DB
}
func NewMessageFactory(db *ledis.DB) MessageFactory {
return &messageFactory{db: db}
}
func (m messageFactory) MessageStore(name string) MessageStore {
return newMessageStore(m.db, name)
}
type MessageStore interface {
// Record 记录
Record(item string) error
// Recently 返回最近的 limit 条记录
Recently(limit int) ([]string, error)
// Truncate 清空历史纪录
Truncate() error
// Keep 只保留指定数量的最新记录
Keep(keepCount int64) error
}
type messageStore struct {
db *ledis.DB
name []byte
}
func newMessageStore(db *ledis.DB, name string) MessageStore {
return &messageStore{db: db, name: []byte(name),}
}
func (ms *messageStore) Record(item string) error {
if _, err := ms.db.LPush(ms.name, []byte(item)); err != nil {
return err
}
return nil
}
func (ms *messageStore) Recently(limit int) ([]string, error) {
vals, err := ms.db.LRange(ms.name, 0, int32(limit))
if err != nil {
return nil, err
}
var hiss []string
_ = coll.Map(vals, &hiss, func(val []byte) string {
return string(val)
})
return hiss, err
}
func (ms *messageStore) Truncate() error {
_, err := ms.db.Del(ms.name)
return err
}
func (ms *messageStore) Keep(keepCount int64) error {
curLen, err := ms.db.LLen(ms.name)
if err != nil {
return err
}
if curLen <= keepCount {
return nil
}
return ms.db.LTrim(ms.name, 0, keepCount)
}