// Copyright 2021 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 util

import (
	"sync"
)

// WaitGroupWrapper is a wrapper for sync.WaitGroup
type WaitGroupWrapper struct {
	sync.WaitGroup
}

// Run runs a function in a goroutine, adds 1 to WaitGroup
// and calls done when function returns. Please DO NOT use panic
// in the cb function.
func (w *WaitGroupWrapper) Run(exec func()) {
	w.Add(1)
	go func() {
		defer w.Done()
		exec()
	}()
}

// RunWithRecover wraps goroutine startup call with force recovery, add 1 to WaitGroup
// and call done when function return. it will dump current goroutine stack into log if catch any recover result.
// exec is that execute logic function. recoverFn is that handler will be called after recover and before dump stack,
// passing `nil` means noop.
func (w *WaitGroupWrapper) RunWithRecover(exec func(), recoverFn func(r interface{})) {
	w.Add(1)
	go func() {
		defer func() {
			r := recover()
			if r != nil && recoverFn != nil {
				recoverFn(r)
			}
			w.Done()
		}()
		exec()
	}()
}