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/*
* Handle the "HELLO" message
*
* Copyright (C) 2024 Runxi Yu <https://runxiyu.org>
* SPDX-License-Identifier: AGPL-3.0-or-later
*
* 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 main
import (
"context"
"strings"
"sync/atomic"
"github.com/coder/websocket"
"github.com/jackc/pgx/v5"
)
func messageHello(
ctx context.Context,
c *websocket.Conn,
mar []string,
userID string,
) error {
_ = mar
select {
case <-ctx.Done():
return wrapError(
errContextCanceled,
ctx.Err(),
)
default:
}
rows, err := db.Query(
ctx,
"SELECT courseid FROM choices WHERE userid = $1",
userID,
)
if err != nil {
return wrapError(errUnexpectedDBError, err)
}
courseIDs, err := pgx.CollectRows(rows, pgx.RowTo[string])
if err != nil {
return wrapError(errUnexpectedDBError, err)
}
if atomic.LoadUint32(&state) == 2 {
err = writeText(ctx, c, "START")
if err != nil {
return wrapError(errCannotSend, err)
}
}
confirmed, err := getConfirmedStatus(ctx, userID)
if err != nil {
return err
}
if !confirmed {
err = writeText(ctx, c, "NC")
if err != nil {
return wrapError(errCannotSend, err)
}
} else {
err = writeText(ctx, c, "YC")
if err != nil {
return wrapError(errCannotSend, err)
}
}
err = writeText(ctx, c, "HI :"+strings.Join(courseIDs, ","))
if err != nil {
return wrapError(errCannotSend, err)
}
return nil
}
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