tidb event 源码
tidb event 代码
文件路径：/util/watcher/event.go
// Copyright 2022 PingCAP, 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 watcher
import (
"bytes"
"os"
)
// Op represents file operation type
type Op uint32
// Operations type current supported
const (
Create Op = 1 << iota
Remove
Modify
Rename
Chmod
Move
)
func (op Op) String() string {
var buffer bytes.Buffer
// now, only one Op will used in polling, but it can combine multi Ops if needed
if op&Create == Create {
buffer.WriteString("|CREATE")
}
if op&Remove == Remove {
buffer.WriteString("|REMOVE")
}
if op&Modify == Modify {
buffer.WriteString("|MODIFY")
}
if op&Rename == Rename {
buffer.WriteString("|RENAME")
}
if op&Chmod == Chmod {
buffer.WriteString("|CHMOD")
}
if op&Move == Move {
buffer.WriteString("|MOVE")
}
if buffer.Len() == 0 {
return ""
}
return buffer.String()[1:] // Strip leading pipe
}
// Event represents a single file operation event
type Event struct {
FileInfo os.FileInfo
Path string
Op Op
}
// IsDirEvent returns whether is a event for a directory
func (e *Event) IsDirEvent() bool {
if e == nil {
return false
}
return e.FileInfo.IsDir()
}
// HasOps checks whether has any specified operation types
func (e *Event) HasOps(ops ...Op) bool {
if e == nil {
return false
}
for _, op := range ops {
if e.Op&op != 0 {
return true
}
}
return false
}
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