forked from snail007/goproxy
/
pool.go
executable file
·145 lines (136 loc) · 2.53 KB
/
pool.go
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package utils
import (
"log"
"sync"
"time"
)
//ConnPool to use
type ConnPool interface {
Get() (conn interface{}, err error)
Put(conn interface{})
ReleaseAll()
Len() (length int)
}
type poolConfig struct {
Factory func() (interface{}, error)
IsActive func(interface{}) bool
Release func(interface{})
InitialCap int
MaxCap int
}
func NewConnPool(poolConfig poolConfig) (pool ConnPool, err error) {
p := netPool{
config: poolConfig,
conns: make(chan interface{}, poolConfig.MaxCap),
lock: &sync.Mutex{},
}
//log.Printf("pool MaxCap:%d", poolConfig.MaxCap)
if poolConfig.MaxCap > 0 {
err = p.initAutoFill(false)
if err == nil {
p.initAutoFill(true)
}
}
return &p, nil
}
type netPool struct {
conns chan interface{}
lock *sync.Mutex
config poolConfig
}
func (p *netPool) initAutoFill(async bool) (err error) {
var worker = func() (err error) {
for {
//log.Printf("pool fill: %v , len: %d", p.Len() <= p.config.InitialCap/2, p.Len())
if p.Len() <= p.config.InitialCap/2 {
p.lock.Lock()
errN := 0
for i := 0; i < p.config.InitialCap; i++ {
c, err := p.config.Factory()
if err != nil {
errN++
if async {
continue
} else {
p.lock.Unlock()
return err
}
}
select {
case p.conns <- c:
default:
p.config.Release(c)
break
}
if p.Len() >= p.config.InitialCap {
break
}
}
if errN > 0 {
log.Printf("fill conn pool fail , ERRN:%d", errN)
}
p.lock.Unlock()
}
if !async {
return
}
time.Sleep(time.Second * 2)
}
}
if async {
go worker()
} else {
err = worker()
}
return
}
func (p *netPool) Get() (conn interface{}, err error) {
// defer func() {
// log.Printf("pool len : %d", p.Len())
// }()
p.lock.Lock()
defer p.lock.Unlock()
// for {
select {
case conn = <-p.conns:
if p.config.IsActive(conn) {
return
}
p.config.Release(conn)
default:
conn, err = p.config.Factory()
if err != nil {
return nil, err
}
return conn, nil
}
// }
return
}
func (p *netPool) Put(conn interface{}) {
if conn == nil {
return
}
p.lock.Lock()
defer p.lock.Unlock()
if !p.config.IsActive(conn) {
p.config.Release(conn)
}
select {
case p.conns <- conn:
default:
p.config.Release(conn)
}
}
func (p *netPool) ReleaseAll() {
p.lock.Lock()
defer p.lock.Unlock()
close(p.conns)
for c := range p.conns {
p.config.Release(c)
}
p.conns = make(chan interface{}, p.config.InitialCap)
}
func (p *netPool) Len() (length int) {
return len(p.conns)
}