152 lines
3.0 KiB
Go
152 lines
3.0 KiB
Go
package gemini
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import (
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"context"
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"crypto/tls"
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"io"
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"net"
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"sync"
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)
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// Server listens on a network and serves the gemini protocol.
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type Server struct {
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ctx context.Context
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network string
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address string
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cancel context.CancelFunc
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wg *sync.WaitGroup
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listener net.Listener
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handler Handler
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}
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// NewServer builds a server.
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func NewServer(
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ctx context.Context,
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tlsConfig *tls.Config,
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network string,
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address string,
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handler Handler,
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) (*Server, error) {
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listener, err := net.Listen(network, address)
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if err != nil {
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return nil, err
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}
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addr := listener.Addr()
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s := &Server{
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ctx: ctx,
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network: addr.Network(),
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address: addr.String(),
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wg: &sync.WaitGroup{},
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listener: tls.NewListener(listener, tlsConfig),
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handler: handler,
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}
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return s, nil
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}
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// Serve starts the server and blocks until it is closed.
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//
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// This function will allocate resources which are not cleaned up until
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// Close() is called.
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//
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// It will respect cancellation of the context the server was created with,
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// but be aware that Close() must still be called in that case to avoid
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// dangling goroutines.
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func (s *Server) Serve() error {
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s.wg.Add(1)
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defer s.wg.Done()
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s.ctx, s.cancel = context.WithCancel(s.ctx)
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s.wg.Add(1)
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s.propagateCancel()
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for {
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conn, err := s.listener.Accept()
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if err != nil {
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if s.closed() {
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err = nil
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}
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return err
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}
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s.wg.Add(1)
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go s.handleConn(conn)
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}
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}
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// Close begins a graceful shutdown of the server.
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//
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// It cancels the server's context which interrupts all concurrently running
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// request handlers, if they support it. It then blocks until all resources
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// have been cleaned up and all request handlers have completed.
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func (s *Server) Close() {
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s.cancel()
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s.wg.Wait()
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}
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// Network returns the network type on which the server is running.
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func (s *Server) Network() string {
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return s.network
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}
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// Address returns the address on which the server is listening.
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func (s *Server) Address() string {
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return s.address
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}
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// Hostname returns just the hostname portion of the listen address.
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func (s *Server) Hostname() string {
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host, _, _ := net.SplitHostPort(s.address)
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return host
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}
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// Port returns the port on which the server is listening.
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func (s *Server) Port() string {
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_, portStr, _ := net.SplitHostPort(s.address)
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return portStr
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}
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func (s *Server) handleConn(conn net.Conn) {
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defer s.wg.Done()
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defer conn.Close()
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req, err := ParseRequest(conn)
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if err != nil {
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_, _ = io.Copy(conn, BadRequest(err.Error()))
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return
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}
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req.Server = s
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req.RemoteAddr = conn.RemoteAddr()
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if tlsconn, ok := conn.(*tls.Conn); req != nil && ok {
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state := tlsconn.ConnectionState()
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req.TLSState = &state
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}
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resp := s.handler(s.ctx, req)
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defer resp.Close()
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_, _ = io.Copy(conn, resp)
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}
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func (s *Server) propagateCancel() {
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go func() {
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defer s.wg.Done()
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<-s.ctx.Done()
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_ = s.listener.Close()
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}()
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}
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func (s *Server) closed() bool {
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select {
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case <-s.ctx.Done():
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return true
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default:
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return false
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}
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}
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