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1.6 KiB
1.6 KiB
WebSocket API
Vollduplex-Streaming für Echtzeit-Datenfeeds und Push-Benachrichtigungen.
Verbindung
ws://localhost:9471/ws
Client-Beispiel
const ws = new WebSocket('ws://localhost:9471/ws');
ws.onopen = () => {
console.log('Connected');
ws.send(JSON.stringify({
type: 'query',
sql: 'SELECT * FROM users'
}));
};
ws.onmessage = (event) => {
const data = JSON.parse(event.data);
console.log('Received:', data);
};
Nachrichtenformat
{
"type": "query",
"id": "uuid",
"sql": "SELECT * FROM users"
}
Nachrichtentypen
Query-Anfrage
{
"type": "query",
"id": "123",
"sql": "SELECT * FROM users"
}
Query-Antwort
{
"type": "result",
"id": "123",
"data": [
{"id": 1, "name": "Alice"},
{"id": 2, "name": "Bob"}
]
}
Fehlerantwort
{
"type": "error",
"id": "123",
"error": {
"code": "INVALID_QUERY",
"message": "Syntax error"
}
}
Subscription
Änderungen abonnieren:
{
"type": "subscribe",
"id": "sub1",
"table": "users"
}
Push-Benachrichtigung
Server-Push:
{
"type": "push",
"table": "users",
"action": "insert",
"data": {"id": 3, "name": "Charlie"}
}
JavaScript-Client
class BaraDBClient {
constructor(url) {
this.ws = new WebSocket(url);
this.pending = new Map();
}
query(sql) {
return new Promise((resolve, reject) => {
const id = crypto.randomUUID();
this.pending.set(id, { resolve, reject });
this.ws.send(JSON.stringify({ type: 'query', id, sql }));
});
}
}