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package main
import (
"crypto/tls"
"fmt"
"net"
"net/http"
"os"
"time"
proxyproto "github.com/pires/go-proxyproto"
"gitlab.com/gitlab-org/gitlab-pages/internal/netutil"
)
type keepAliveListener struct {
net.Listener
}
type keepAliveSetter interface {
SetKeepAlive(bool) error
SetKeepAlivePeriod(time.Duration) error
}
type listenerConfig struct {
isProxyV2 bool
tlsConfig *tls.Config
limiter *netutil.Limiter
}
func (ln *keepAliveListener) Accept() (net.Conn, error) {
conn, err := ln.Listener.Accept()
if err != nil {
return nil, err
}
kc := conn.(keepAliveSetter)
kc.SetKeepAlive(true)
kc.SetKeepAlivePeriod(3 * time.Minute)
return conn, nil
}
func (a *theApp) listenAndServe(server *http.Server, fd uintptr, h http.Handler, opts ...option) error {
config := &listenerConfig{}
for _, opt := range opts {
opt(config)
}
// create server
server.Handler = h
server.TLSConfig = config.tlsConfig
// ensure http2 is enabled even if TLSConfig is not null
// See https://github.com/golang/go/blob/97cee43c93cfccded197cd281f0a5885cdb605b4/src/net/http/server.go#L2947-L2954
if server.TLSConfig != nil {
server.TLSConfig.NextProtos = append(server.TLSConfig.NextProtos, "h2")
}
l, err := net.FileListener(os.NewFile(fd, "[socket]"))
if err != nil {
return fmt.Errorf("failed to listen on FD %d: %w", fd, err)
}
if config.limiter != nil {
l = netutil.SharedLimitListener(l, config.limiter)
}
l = &keepAliveListener{l}
if config.isProxyV2 {
l = &proxyproto.Listener{
Listener: l,
Policy: func(upstream net.Addr) (proxyproto.Policy, error) {
return proxyproto.REQUIRE, nil
},
}
}
if config.tlsConfig != nil {
l = tls.NewListener(l, server.TLSConfig)
}
return server.Serve(l)
}
type option func(*listenerConfig)
func withProxyV2() option {
return func(conf *listenerConfig) {
conf.isProxyV2 = true
}
}
func withTLSConfig(c *tls.Config) option {
return func(conf *listenerConfig) {
conf.tlsConfig = c
}
}
func withLimiter(l *netutil.Limiter) option {
return func(conf *listenerConfig) {
conf.limiter = l
}
}
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