Moving session code into its own file

core/session.go

@@ -0,0 +1,66 @@
+package core
+
+import (
+	"bufio"
+	"context"
+	"fmt"
+	"log/slog"
+	"net"
+
+	"github.com/google/uuid"
+)
+
+type Session struct {
+	c   net.Conn
+	ctx context.Context
+	p   Printer
+	l   *slog.Logger
+
+	userID uint64
+}
+
+func NewSession(ctx context.Context, c net.Conn, p Printer, l *slog.Logger) *Session {
+	sid := uuid.New()
+	return &Session{
+		ctx: ctx,
+		l:   l.With(slog.String("sid", sid.String())),
+		c:   c,
+	}
+}
+
+func (s *Session) bufferInput(commands chan string) {
+	scanner := bufio.NewScanner(s.c)
+	defer close(commands)
+
+	for scanner.Scan() {
+		err := scanner.Err()
+		switch err {
+		case nil:
+			commands <- scanner.Text()
+		default:
+			s.l.With(slog.Any("error", scanner.Err())).Error("error scanning input")
+			return
+		}
+	}
+
+	s.l.Debug("session terminated")
+}
+
+func (s *Session) Start() {
+	s.l.Debug("starting telnet session")
+	fmt.Fprint(s.c, "Welcome to Bing Bong.\n")
+
+	commands := make(chan string)
+	go s.bufferInput(commands)
+
+	for command := range commands {
+		s.l.With(slog.String("command", command)).Debug("command recieved")
+		_, err := fmt.Fprintf(s.c, "> %q\n", command)
+		if err != nil {
+			s.l.With(
+				slog.Any("error", err),
+			).Error("connection closed on write")
+			return
+		}
+	}
+}