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udpclient.go
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udpclient.go
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// Copyright (c) 2019-present Cloud <cloud@txthinking.com>
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 3 of the GNU General Public
// License as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package zoro
import (
"errors"
"log"
"net"
"time"
"github.com/gogo/protobuf/proto"
cache "github.com/patrickmn/go-cache"
)
// UDPClient .
type UDPClient struct {
Client *Client
UDPConn *net.UDPConn
Cache *cache.Cache
Done chan byte
Data chan []byte
Error chan error
}
// NewUDPClient .
func NewUDPClient(c *Client) (*UDPClient, error) {
tmp, err := Dial.Dial("udp", c.Server)
if err != nil {
return nil, err
}
conn := tmp.(*net.UDPConn)
tmp1, err := c.Ckv.Encrypt("Mr.2", "UDPPacket")
if err != nil {
conn.Close()
return nil, err
}
p := &UDPPacket{
Port: c.ServerPort,
Key: tmp1,
}
bb, err := proto.Marshal(p)
if err != nil {
conn.Close()
return nil, err
}
if _, err := conn.Write(bb); err != nil {
conn.Close()
return nil, err
}
var b [65536]byte
i, err := conn.Read(b[:])
if err != nil {
conn.Close()
return nil, err
}
p = &UDPPacket{}
if err := proto.Unmarshal(b[0:i], p); err != nil {
conn.Close()
return nil, err
}
if p.Address != "0" {
conn.Close()
return nil, errors.New(p.Address)
}
uc := &UDPClient{
Client: c,
UDPConn: conn,
Cache: cache.New(cache.NoExpiration, cache.NoExpiration),
Done: make(chan byte),
Data: make(chan []byte),
Error: make(chan error),
}
return uc, nil
}
// Run .
func (c *UDPClient) Run() error {
defer close(c.Done)
defer c.UDPConn.Close()
go c.Ping()
go c.Read()
for {
select {
case b := <-c.Data:
if _, err := c.UDPConn.Write(b); err != nil {
return err
}
case err := <-c.Error:
return err
}
}
return nil
}
// Stop .
func (c *UDPClient) Stop() {
select {
case <-c.Done:
return
case c.Error <- nil:
}
}
// Ping server .
func (c *UDPClient) Ping() {
for {
time.Sleep(5 * time.Second)
p := &UDPPacket{
Port: c.Client.ServerPort,
Address: "0",
}
bb, err := proto.Marshal(p)
if err != nil {
select {
case <-c.Done:
return
case c.Error <- err:
}
return
}
select {
case <-c.Done:
return
case c.Data <- bb:
}
}
}
// Read data from server.
func (c *UDPClient) Read() {
var b [65536]byte
for {
i, err := c.UDPConn.Read(b[:])
if err != nil {
select {
case <-c.Done:
return
case c.Error <- err:
}
return
}
p := &UDPPacket{}
if err := proto.Unmarshal(b[0:i], p); err != nil {
continue
}
it, ok := c.Cache.Get(p.Address)
if ok {
c1 := it.(*net.UDPConn)
if c.Client.UDPDeadline != 0 {
if err := c1.SetDeadline(time.Now().Add(time.Duration(c.Client.UDPDeadline) * time.Second)); err != nil {
continue
}
}
if _, err := c1.Write(p.Data); err != nil {
continue
}
continue
}
tmp, err := Dial.Dial("udp", c.Client.ClientServer)
if err != nil {
log.Println(err)
continue
}
c1 := tmp.(*net.UDPConn)
if c.Client.UDPDeadline != 0 {
if err := c1.SetDeadline(time.Now().Add(time.Duration(c.Client.UDPDeadline) * time.Second)); err != nil {
log.Println(err)
c1.Close()
continue
}
}
if _, err := c1.Write(p.Data); err != nil {
log.Println(err)
c1.Close()
return
}
c.Cache.Set(p.Address, c1, cache.DefaultExpiration)
go func(p *UDPPacket, c1 *net.UDPConn) {
defer c1.Close()
defer c.Cache.Delete(p.Address)
var b [65536]byte
for {
if c.Client.UDPDeadline != 0 {
if err := c1.SetDeadline(time.Now().Add(time.Duration(c.Client.UDPDeadline) * time.Second)); err != nil {
return
}
}
i, err := c1.Read(b[:])
if err != nil {
return
}
p := &UDPPacket{
Port: c.Client.ServerPort,
Address: p.Address,
Data: b[0:i],
}
b, err := proto.Marshal(p)
if err != nil {
select {
case <-c.Done:
return
case c.Error <- err:
}
return
}
select {
case <-c.Done:
return
case c.Data <- b:
}
}
}(p, c1)
}
}