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140 lines
2.7 KiB
Go
140 lines
2.7 KiB
Go
package server
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import (
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"context"
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"fmt"
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"net"
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"net/http"
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"os"
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"strconv"
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"sync"
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"time"
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"github.com/gorilla/websocket"
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"github.com/jordanorelli/astro-domu/internal/errors"
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"github.com/jordanorelli/astro-domu/internal/wire"
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"github.com/jordanorelli/blammo"
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)
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type Server struct {
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sync.Mutex
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*blammo.Log
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Host string
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Port int
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http *http.Server
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lastSessionID int
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sessions map[int]*session
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}
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func (s *Server) Start() error {
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if s.Host == "" {
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s.Host = "127.0.0.1"
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}
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if s.Port == 0 {
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s.Port = 12805
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}
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if s.Log == nil {
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stdout := blammo.NewLineWriter(os.Stdout)
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stderr := blammo.NewLineWriter(os.Stderr)
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options := []blammo.Option{
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blammo.DebugWriter(stdout),
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blammo.InfoWriter(stdout),
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blammo.ErrorWriter(stderr),
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}
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s.Log = blammo.NewLog("astro", options...).Child("server")
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}
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addr := fmt.Sprintf("%s:%d", s.Host, s.Port)
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lis, err := net.Listen("tcp", addr)
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if err != nil {
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return fmt.Errorf("server failed to start a listener: %w", err)
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}
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s.Log.Info("listening for TCP traffic on %q", addr)
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go s.runHTTPServer(lis)
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return nil
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}
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func (s *Server) runHTTPServer(lis net.Listener) {
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srv := http.Server{
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Handler: s,
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}
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s.http = &srv
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err := srv.Serve(lis)
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if err != nil && !errors.Is(err, http.ErrServerClosed) {
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s.Error("error in http.Serve: %v", err)
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}
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}
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func (s *Server) createSession(conn *websocket.Conn) *session {
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s.Lock()
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defer s.Unlock()
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s.lastSessionID++
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sn := &session{
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Log: s.Log.Child("sessions").Child(strconv.Itoa(s.lastSessionID)),
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id: s.lastSessionID,
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conn: conn,
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outbox: make(chan wire.Response),
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done: make(chan chan struct{}, 1),
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}
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if s.sessions == nil {
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s.sessions = make(map[int]*session)
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}
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s.sessions[sn.id] = sn
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return sn
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}
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func (s *Server) dropSession(sn *session) {
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s.Lock()
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defer s.Unlock()
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close(sn.done)
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delete(s.sessions, sn.id)
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}
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func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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upgrader := websocket.Upgrader{}
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conn, err := upgrader.Upgrade(w, r, nil)
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if err != nil {
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s.Error("upgrade error: %v", err)
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return
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}
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defer func() {
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s.Info("closing connection")
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if err := conn.Close(); err != nil {
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s.Error("error closing connection: %v", err)
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}
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}()
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sn := s.createSession(conn)
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defer s.dropSession(sn)
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go sn.run()
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sn.read()
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}
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func (s *Server) Shutdown() {
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s.Info("shutting down")
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s.http.Shutdown(context.Background())
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s.Lock()
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zzz := make([]chan struct{}, 0, len(s.sessions))
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for id, sn := range s.sessions {
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s.Info("sending done signal to session: %d", id)
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c := make(chan struct{})
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zzz = append(zzz, c)
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sn.done <- c
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}
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s.Unlock()
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for _, c := range zzz {
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<-c
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}
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time.Sleep(time.Second)
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}
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