cubefs

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// Copyright 2022 The CubeFS Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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//     http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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// implied. See the License for the specific language governing
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// permissions and limitations under the License.
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package bcache
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import (
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	"net"
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	"time"
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)
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const (
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	DefaultTimeOut    = 1 * time.Second
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	ConnectExpireTime = 20
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)
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type ConnObject struct {
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	c          *net.Conn
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	lastActive int64
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}
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type ConnPool struct {
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	conns  chan *ConnObject
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	mincap int
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	maxcap int
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	expire int64
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	target string
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}
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func NewConnPool(target string, mincap, maxcap int, expire int64) *ConnPool {
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	p := &ConnPool{
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		conns:  make(chan *ConnObject, maxcap),
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		mincap: mincap,
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		maxcap: maxcap,
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		expire: expire,
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		target: target,
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	}
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	return p
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}
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func (connPool *ConnPool) Get() (c *net.Conn, err error) {
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	var o *ConnObject
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	for {
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		select {
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		case o = <-connPool.conns:
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		default:
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			return connPool.NewConnect(connPool.target)
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		}
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		if time.Now().UnixNano()-o.lastActive > connPool.expire {
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			_ = (*o.c).Close()
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			o = nil
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			continue
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		}
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		return o.c, nil
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	}
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}
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func (connPool *ConnPool) NewConnect(target string) (*net.Conn, error) {
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	conn, err := net.DialTimeout("unix", target, DefaultTimeOut)
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	return &conn, err
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}
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func (connPool *ConnPool) Put(c *net.Conn) {
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	o := &ConnObject{
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		c:          c,
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		lastActive: time.Now().UnixNano(),
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	}
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	select {
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	case connPool.conns <- o:
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		return
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	default:
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		if o.c != nil {
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			(*o.c).Close()
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		}
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		return
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	}
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}
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