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pool.go
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pool.go
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package snell
import (
"context"
"net"
"time"
"github.com/DryPeng/clashT/component/pool"
"github.com/DryPeng/clashT/transport/shadowsocks/shadowaead"
)
type Pool struct {
pool *pool.Pool
}
func (p *Pool) Get() (net.Conn, error) {
return p.GetContext(context.Background())
}
func (p *Pool) GetContext(ctx context.Context) (net.Conn, error) {
elm, err := p.pool.GetContext(ctx)
if err != nil {
return nil, err
}
return &PoolConn{elm.(*Snell), p}, nil
}
func (p *Pool) Put(conn net.Conn) {
if err := HalfClose(conn); err != nil {
conn.Close()
return
}
p.pool.Put(conn)
}
type PoolConn struct {
*Snell
pool *Pool
}
func (pc *PoolConn) Read(b []byte) (int, error) {
// save old status of reply (it mutable by Read)
reply := pc.Snell.reply
n, err := pc.Snell.Read(b)
if err == shadowaead.ErrZeroChunk {
// if reply is false, it should be client halfclose.
// ignore error and read data again.
if !reply {
pc.Snell.reply = false
return pc.Snell.Read(b)
}
}
return n, err
}
func (pc *PoolConn) Write(b []byte) (int, error) {
return pc.Snell.Write(b)
}
func (pc *PoolConn) Close() error {
// clash use SetReadDeadline to break bidirectional copy between client and server.
// reset it before reuse connection to avoid io timeout error.
pc.Snell.Conn.SetReadDeadline(time.Time{})
pc.pool.Put(pc.Snell)
return nil
}
func NewPool(factory func(context.Context) (*Snell, error)) *Pool {
p := pool.New(
func(ctx context.Context) (any, error) {
return factory(ctx)
},
pool.WithAge(15000),
pool.WithSize(10),
pool.WithEvict(func(item any) {
item.(*Snell).Close()
}),
)
return &Pool{p}
}