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import { DurableObject } from "cloudflare:workers"
import { randomUUID } from "node:crypto"
import { Resource } from "sst"
type Bindings = {
SYNC_SERVER: DurableObjectNamespace<SyncServer>
}
export class SyncServer extends DurableObject {
async fetch(req: Request) {
console.log("SyncServer subscribe")
const webSocketPair = new WebSocketPair()
const [client, server] = Object.values(webSocketPair)
this.ctx.acceptWebSocket(server)
setTimeout(async () => {
const data = await this.ctx.storage.list()
data.forEach((content: any, key) => {
if (key === "shareID") return
server.send(JSON.stringify({ key, content: JSON.parse(content) }))
})
}, 0)
return new Response(null, {
status: 101,
webSocket: client,
})
}
async webSocketMessage(ws, message) {}
async webSocketClose(ws, code, reason, wasClean) {
ws.close(code, "Durable Object is closing WebSocket")
}
async publish(key: string, content: string) {
await this.ctx.storage.put(key, content)
const clients = this.ctx.getWebSockets()
console.log("SyncServer publish", key, "to", clients.length, "subscribers")
clients.forEach((client) => client.send(JSON.stringify({ key, content })))
}
async setShareID(shareID: string) {
await this.ctx.storage.put("shareID", shareID)
}
async getShareID() {
return this.ctx.storage.get<string>("shareID")
}
async clear() {
await this.ctx.storage.deleteAll()
}
}
export default {
async fetch(request: Request, env: Bindings, ctx: ExecutionContext) {
const url = new URL(request.url)
const splits = url.pathname.split("/")
const method = splits[1]
if (request.method === "GET" && method === "") {
return new Response("Hello, world!", {
headers: { "Content-Type": "text/plain" },
})
}
if (request.method === "POST" && method === "share_create") {
const body = await request.json<any>()
const sessionID = body.sessionID
// Get existing shareID
const id = env.SYNC_SERVER.idFromName(sessionID)
const stub = env.SYNC_SERVER.get(id)
if (await stub.getShareID())
return new Response("Error: Session already shared", { status: 400 })
const shareID = randomUUID()
await stub.setShareID(shareID)
return new Response(JSON.stringify({ shareID }), {
headers: { "Content-Type": "application/json" },
})
}
if (request.method === "POST" && method === "share_delete") {
const body = await request.json<any>()
const sessionID = body.sessionID
const shareID = body.shareID
// validate shareID
if (!shareID)
return new Response("Error: Share ID is required", { status: 400 })
// Delete from durable object
const id = env.SYNC_SERVER.idFromName(sessionID)
const stub = env.SYNC_SERVER.get(id)
if ((await stub.getShareID()) !== shareID)
return new Response("Error: Share ID does not match", { status: 400 })
await stub.clear()
return new Response(JSON.stringify({}), {
headers: { "Content-Type": "application/json" },
})
}
if (request.method === "POST" && method === "share_sync") {
const body = await request.json<any>()
const sessionID = body.sessionID
const shareID = body.shareID
const key = body.key
const content = body.content
console.log("share_sync", sessionID, shareID, key, content)
// validate key
if (
!key.startsWith(`session/info/${sessionID}`) &&
!key.startsWith(`session/message/${sessionID}/`)
)
return new Response("Error: Invalid key", { status: 400 })
// validate shareID
if (!shareID)
return new Response("Error: Share ID is required", { status: 400 })
// send message to server
const id = env.SYNC_SERVER.idFromName(sessionID)
const stub = env.SYNC_SERVER.get(id)
if ((await stub.getShareID()) !== shareID)
return new Response("Error: Share ID does not match", { status: 400 })
await stub.publish(key, content)
// store message
await Resource.Bucket.put(
`${shareID}/${key}.json`,
JSON.stringify(content),
)
return new Response(JSON.stringify({}), {
headers: { "Content-Type": "application/json" },
})
}
if (request.method === "GET" && method === "share_poll") {
// Expect to receive a WebSocket Upgrade request.
// If there is one, accept the request and return a WebSocket Response.
const upgradeHeader = request.headers.get("Upgrade")
if (!upgradeHeader || upgradeHeader !== "websocket") {
return new Response("Error: Upgrade header is required", {
status: 426,
})
}
// get query parameters
const sessionID = url.searchParams.get("id")
if (!sessionID)
return new Response("Error: Share ID is required", { status: 400 })
// subscribe to server
const id = env.SYNC_SERVER.idFromName(sessionID)
const stub = env.SYNC_SERVER.get(id)
if (!(await stub.getShareID()))
return new Response("Error: Session not shared", { status: 400 })
return stub.fetch(request)
}
},
}
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