chadtmiller.com
+76
src/pds.js
+76
src/pds.js
···
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576
did, commitCidStr, evt
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)
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+
// Broadcast to subscribers
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+
const evtRows = this.sql.exec(
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+
`SELECT * FROM seq_events ORDER BY seq DESC LIMIT 1`
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+
).toArray()
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+
if (evtRows.length > 0) {
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this.broadcastEvent(evtRows[0])
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+
}
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+
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return { uri, cid: recordCidStr, commit: commitCidStr }
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+
}
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+
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+
formatEvent(evt) {
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// AT Protocol frame format: header + body
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const header = cborEncode({ op: 1, t: '#commit' })
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const body = cborEncode({
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seq: evt.seq,
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rebase: false,
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+
tooBig: false,
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+
repo: evt.did,
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commit: cidToBytes(evt.commit_cid),
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+
rev: createTid(),
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+
since: null,
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+
blocks: new Uint8Array(0), // Simplified - real impl includes CAR slice
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ops: cborDecode(new Uint8Array(evt.evt)).ops,
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+
blobs: [],
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+
time: new Date().toISOString()
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+
})
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+
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+
// Concatenate header + body
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const frame = new Uint8Array(header.length + body.length)
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frame.set(header)
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+
frame.set(body, header.length)
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+
return frame
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+
}
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+
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+
async webSocketMessage(ws, message) {
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// Handle ping
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+
if (message === 'ping') ws.send('pong')
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+
}
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+
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async webSocketClose(ws, code, reason) {
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// Durable Object will hibernate when no connections remain
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+
}
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+
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+
broadcastEvent(evt) {
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+
const frame = this.formatEvent(evt)
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+
for (const ws of this.state.getWebSockets()) {
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+
try {
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+
ws.send(frame)
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+
} catch (e) {
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// Client disconnected
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+
}
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+
}
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}
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async fetch(request) {
···
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return new Response(car, {
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headers: { 'content-type': 'application/vnd.ipld.car' }
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})
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+
}
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+
if (url.pathname === '/xrpc/com.atproto.sync.subscribeRepos') {
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const upgradeHeader = request.headers.get('Upgrade')
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+
if (upgradeHeader !== 'websocket') {
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return new Response('expected websocket', { status: 426 })
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+
}
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+
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const { 0: client, 1: server } = new WebSocketPair()
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+
this.state.acceptWebSocket(server)
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+
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+
// Send backlog if cursor provided
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const cursor = url.searchParams.get('cursor')
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+
if (cursor) {
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+
const events = this.sql.exec(
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+
`SELECT * FROM seq_events WHERE seq > ? ORDER BY seq`,
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+
parseInt(cursor)
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+
).toArray()
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+
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+
for (const evt of events) {
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+
server.send(this.formatEvent(evt))
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+
}
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+
}
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+
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+
return new Response(null, { status: 101, webSocket: client })
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}
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return new Response('pds running', { status: 200 })
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}