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accept.go
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accept.go
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package proxy
import (
log "github.com/Sirupsen/logrus"
ctx "context"
"crypto/tls"
"net"
)
// config holds network type, address, and tls info
type config struct {
network string
addr string
tlscfg *tls.Config
}
func newListener(c ctx.Context, cfg *config) (net.Listener, error) {
var (
logger = log.WithFields(log.Fields{"net": cfg.network, "from": cfg.addr, "tls": cfg.tlscfg != nil})
retry = &Backoff{}
)
for {
select {
default:
ln, err := net.Listen(cfg.network, cfg.addr)
if err != nil {
logger.WithFields(log.Fields{"err": err}).Warning("listen")
retry.Delay()
} else {
// Upgrade connection to TLS if config available
if cfg.tlscfg != nil {
ln = tls.NewListener(ln, cfg.tlscfg)
}
logger.Debug("listen")
return ln, nil
}
case <-c.Done():
return nil, ErrProxyEnd
}
}
}
func accept(ln net.Listener) (conn <-chan net.Conn) {
connChan := make(chan net.Conn)
go func() {
conn, err := ln.Accept()
if err != nil {
log.WithFields(log.Fields{"err": err}).Debug("accept")
} else {
connChan <- conn
}
}()
return connChan
}
// acceptWorker takes a net.Listener and starts Accept
// In place spawn goroutine
// Accepted connections are reported to newConn
// expect stop channel to close when acceptWorker terminates
func acceptWorker(c ctx.Context, cfg *config) (newConn <-chan net.Conn, stop <-chan struct{}, err error) {
ln, err := newListener(c, cfg)
if err != nil {
return
}
nc, s := make(chan net.Conn, 8), make(chan struct{})
go func() {
defer close(s)
defer ln.Close()
for yay := true; yay; {
v := accept(ln)
select {
case <-c.Done():
yay = false
case conn, ok := <-v:
if ok {
nc <- conn
}
yay = ok
}
}
}()
newConn, stop, err = nc, s, nil
return
}