connector: share session construction logic

So we can't forget to set up the logging handler.

pkg/connector/session.go

@@ -0,0 +1,44 @@
+// mautrix-discord - A Matrix-Discord puppeting bridge.
+// Copyright (C) 2024 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package connector
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/bwmarrin/discordgo"
+	"github.com/rs/zerolog"
+)
+
+func NewDiscordSession(ctx context.Context, token string) (*discordgo.Session, error) {
+	log := zerolog.Ctx(ctx)
+
+	session, err := discordgo.New(token)
+	if err != nil {
+		return nil, fmt.Errorf("couldn't create discord session: %w", err)
+	}
+
+	// Set up logging.
+	session.LogLevel = discordgo.LogInformational
+	session.Logger = func(msgL, caller int, format string, a ...any) {
+		// FIXME(skip): Hook up zerolog properly.
+		log.Debug().Str("component", "discordgo").Msgf(strings.TrimSpace(format), a...) // zerolog-allow-msgf
+	}
+
+	return session, nil
+}