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Diffstat (limited to '')
-rw-r--r-- | wsmsg_hello.go | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/wsmsg_hello.go b/wsmsg_hello.go new file mode 100644 index 0000000..b92dde9 --- /dev/null +++ b/wsmsg_hello.go @@ -0,0 +1,78 @@ +/* + * 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" + "fmt" + "strings" + "sync/atomic" + + "github.com/coder/websocket" + "github.com/jackc/pgx/v5" +) + +func messageHello( + ctx context.Context, + c *websocket.Conn, + reportError reportErrorT, + mar []string, + userID string, + session string, +) error { + _, _ = mar, session + + select { + case <-ctx.Done(): + return fmt.Errorf( + "%w: %w", + errContextCancelled, + ctx.Err(), + ) + default: + } + + rows, err := db.Query( + ctx, + "SELECT courseid FROM choices WHERE userid = $1", + userID, + ) + if err != nil { + return reportError("error fetching choices") + } + courseIDs, err := pgx.CollectRows(rows, pgx.RowTo[string]) + if err != nil { + return reportError("error collecting choices") + } + + if atomic.LoadUint32(&state) == 2 { + err = writeText(ctx, c, "START") + if err != nil { + return fmt.Errorf("%w: %w", errCannotSend, err) + } + } + err = writeText(ctx, c, "HI :"+strings.Join(courseIDs, ",")) + if err != nil { + return fmt.Errorf("%w: %w", errCannotSend, err) + } + + return nil +} |