103 lines
1.8 KiB
Go
103 lines
1.8 KiB
Go
package fasthttp
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import (
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"fmt"
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"net"
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"sync"
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)
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type perIPConnCounter struct {
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pool sync.Pool
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lock sync.Mutex
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m map[uint32]int
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}
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func (cc *perIPConnCounter) Register(ip uint32) int {
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cc.lock.Lock()
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if cc.m == nil {
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cc.m = make(map[uint32]int)
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}
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n := cc.m[ip] + 1
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cc.m[ip] = n
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cc.lock.Unlock()
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return n
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}
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func (cc *perIPConnCounter) Unregister(ip uint32) {
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cc.lock.Lock()
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if cc.m == nil {
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cc.lock.Unlock()
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panic("BUG: perIPConnCounter.Register() wasn't called")
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}
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n := cc.m[ip] - 1
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if n < 0 {
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cc.lock.Unlock()
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panic(fmt.Sprintf("BUG: negative per-ip counter=%d for ip=%d", n, ip))
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}
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cc.m[ip] = n
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cc.lock.Unlock()
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}
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type perIPConn struct {
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net.Conn
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ip uint32
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perIPConnCounter *perIPConnCounter
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}
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func acquirePerIPConn(conn net.Conn, ip uint32, counter *perIPConnCounter) *perIPConn {
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v := counter.pool.Get()
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if v == nil {
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return &perIPConn{
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perIPConnCounter: counter,
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Conn: conn,
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ip: ip,
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}
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}
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c := v.(*perIPConn)
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c.Conn = conn
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c.ip = ip
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return c
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}
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func releasePerIPConn(c *perIPConn) {
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c.Conn = nil
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c.perIPConnCounter.pool.Put(c)
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}
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func (c *perIPConn) Close() error {
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err := c.Conn.Close()
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c.perIPConnCounter.Unregister(c.ip)
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releasePerIPConn(c)
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return err
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}
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func getUint32IP(c net.Conn) uint32 {
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return ip2uint32(getConnIP4(c))
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}
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func getConnIP4(c net.Conn) net.IP {
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addr := c.RemoteAddr()
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ipAddr, ok := addr.(*net.TCPAddr)
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if !ok {
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return net.IPv4zero
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}
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return ipAddr.IP.To4()
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}
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func ip2uint32(ip net.IP) uint32 {
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if len(ip) != 4 {
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return 0
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}
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return uint32(ip[0])<<24 | uint32(ip[1])<<16 | uint32(ip[2])<<8 | uint32(ip[3])
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}
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func uint322ip(ip uint32) net.IP {
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b := make([]byte, 4)
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b[0] = byte(ip >> 24)
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b[1] = byte(ip >> 16)
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b[2] = byte(ip >> 8)
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b[3] = byte(ip)
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return b
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}
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