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proxy.go
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proxy.go
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package kite
import (
"context"
"errors"
"fmt"
"log"
"net"
"github.com/mworzala/kite/pkg/proto"
"github.com/mworzala/kite/pkg/proto/packet"
)
type Logger func(format string, v ...interface{})
type Proxy struct {
ListenAddr string
InitHandler proto.ConnHandlerFunc
Log Logger // Defaults to log.Printf
ErrorLog Logger // Defaults to log.Printf
listener net.Listener
ctx context.Context
}
// Start starts the proxy server on the given ListenAddr.
//
// Start will not block after creating the listener, Stop should be used to stop the proxy.
func (p *Proxy) Start() (err error) {
if err = p.validateParamsAndSetDefaults(); err != nil {
return err
}
p.listener, err = net.Listen("tcp", p.ListenAddr)
if err != nil {
return fmt.Errorf("failed to start listener: %w", err)
}
go p.clientListenLoop()
p.Log("started listening on %s", p.ListenAddr)
return nil
}
func (p *Proxy) Stop() error {
if err := p.listener.Close(); err != nil {
return err
}
return nil
}
func (p *Proxy) clientListenLoop() {
for {
cc, err := p.listener.Accept()
if errors.Is(err, net.ErrClosed) {
break
} else if err != nil {
log.Printf("Failed to accept connection: %s\n", err)
continue
}
conn, readLoop := proto.NewConn(packet.Serverbound, cc)
conn.SetState(packet.Handshake, p.InitHandler(conn))
go readLoop()
}
}
func (p *Proxy) validateParamsAndSetDefaults() error {
if p.ListenAddr == "" {
return errors.New("listen address is required")
}
if p.Log == nil {
p.Log = log.Printf
}
if p.ErrorLog == nil {
p.ErrorLog = log.Printf
}
return nil
}