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package internal
import (
"context"
"net"
"strings"
"sync"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"tildegit.org/tjp/sliderule/logging"
)
type Server struct {
Ctx context.Context
Cancel context.CancelFunc
Wg *sync.WaitGroup
Listener net.Listener
HandleConn connHandler
ErrorLog logging.Logger
Host string
NetworkAddr net.Addr
}
type connHandler func(net.Conn)
func NewServer(
ctx context.Context,
hostname string,
network string,
address string,
baseLog logging.Logger,
handleConn connHandler,
) (Server, error) {
listener, err := net.Listen(network, address)
if err != nil {
return Server{}, err
}
networkAddr := listener.Addr()
ctx, cancel := context.WithCancel(ctx)
if baseLog == nil {
baseLog = log.NewNopLogger()
}
errlog := level.Error(baseLog)
ctx = context.WithValue(ctx, "debuglog", level.Debug(baseLog))
ctx = context.WithValue(ctx, "infolog", level.Info(baseLog))
ctx = context.WithValue(ctx, "warnlog", level.Warn(baseLog))
ctx = context.WithValue(ctx, "errlog", errlog)
return Server{
Ctx: ctx,
Cancel: cancel,
Wg: &sync.WaitGroup{},
Listener: listener,
HandleConn: handleConn,
ErrorLog: errlog,
Host: hostname,
NetworkAddr: networkAddr,
}, nil
}
func (s *Server) Serve() error {
s.Wg.Add(1)
defer s.Wg.Done()
s.propagateClose()
for {
conn, err := s.Listener.Accept()
if err != nil {
if s.Closed() {
err = nil
} else {
_ = s.ErrorLog.Log("msg", "accept error", "error", err)
}
return err
}
s.Wg.Add(1)
go func() {
defer s.Wg.Done()
defer func() { _ = conn.Close() }()
s.HandleConn(conn)
}()
}
}
func (s *Server) Hostname() string {
host, _, _ := net.SplitHostPort(s.Host)
return host
}
func (s *Server) Port() string {
_, port, _ := net.SplitHostPort(s.Host)
return port
}
func (s *Server) Network() string {
return s.NetworkAddr.Network()
}
func (s *Server) Address() string {
return s.NetworkAddr.String()
}
func (s *Server) Close() {
s.Cancel()
s.Wg.Wait()
}
func (s *Server) LogError(keyvals ...any) error {
return s.ErrorLog.Log(keyvals...)
}
func (s *Server) Closed() bool {
select {
case <-s.Ctx.Done():
return true
default:
return false
}
}
func (s *Server) propagateClose() {
s.Wg.Add(1)
go func() {
defer s.Wg.Done()
<-s.Ctx.Done()
_ = s.Listener.Close()
}()
}
// JoinDefaultPort appends ":<port>" iff the address does not already contain a port.
func JoinDefaultPort(address string, port string) string {
if len(address) > 0 && address[0] == '[' {
hend := strings.LastIndexByte(address, ']')
if len(address) > hend+1 && address[hend+1] == ':' {
return address
}
return net.JoinHostPort(address[1:hend], port)
}
if strings.Contains(address, ":") {
return address
}
return net.JoinHostPort(address, port)
}
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