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Diffstat (limited to '')
-rw-r--r-- | wsx.go | 59 |
1 files changed, 59 insertions, 0 deletions
@@ -0,0 +1,59 @@ +/* + * Generic WebSocket auxiliary functions + * + * 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/>. + */ + +/* + * The message format is a WebSocket message separated with spaces. + * The contents of each field could contain anything other than spaces, + * The first character of each argument cannot be a colon. As an exception, the + * last argument may contain spaces and the first character thereof may be a + * colon, if the argument is prefixed with a colon. The colon used for the + * prefix is not considered part of the content of the message. For example, in + * + * SQUISH POP :cat purr!! + * + * the first field is "SQUISH", the second field is "POP", and the third + * field is "cat purr!!". + * + * It is essentially an RFC 1459 IRC message without trailing CR-LF and + * without prefixes. See section 2.3.1 of RFC 1459 for an approximate + * BNF representation. + * + * The reason this was chosen instead of using protobuf etc. is that it + * is simple to parse without external libraries, and it also happens to + * be a format I'm very familiar with, having extensively worked with the + * IRC protocol. + */ + +package main + +import ( + "context" + "fmt" + + "github.com/coder/websocket" +) + +func writeText(ctx context.Context, c *websocket.Conn, msg string) error { + err := c.Write(ctx, websocket.MessageText, []byte(msg)) + if err != nil { + return fmt.Errorf("error writing to connection: %w", err) + } + return nil +} |