1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
import { DurableObject } from "cloudflare:workers"
import { randomUUID } from "node:crypto"
import { Resource } from "sst"
type Bindings = {
SYNC_SERVER: DurableObjectNamespace
}
export class SyncServer extends DurableObject {
private files: Map<string, string> = new Map()
private shareID?: string
constructor(ctx: DurableObjectState, env: Bindings) {
super(ctx, env)
this.ctx.blockConcurrencyWhile(async () => {
this.files = await this.ctx.storage.list()
})
}
async fetch(req: Request) {
console.log("SyncServer subscribe")
const webSocketPair = new WebSocketPair()
const [client, server] = Object.values(webSocketPair)
this.ctx.acceptWebSocket(server)
setTimeout(() => {
this.files.forEach((content, key) =>
server.send(JSON.stringify({ key, 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) {
this.files.set(key, content)
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) {
this.shareID = shareID
}
async getShareID() {
return this.shareID
}
async clear() {
await this.ctx.storage.deleteAll()
this.files.clear()
}
}
export default {
async fetch(request: Request, env: Bindings, ctx: ExecutionContext) {
const url = new URL(request.url)
if (request.method === "GET" && url.pathname === "/") {
return new Response("Hello, world!", {
headers: { "Content-Type": "text/plain" },
})
}
if (request.method === "POST" && url.pathname.endsWith("/share_create")) {
const body = await request.json()
const sessionID = body.sessionID
// Get existing shareID
const id = env.SYNC_SERVER.idFromName(sessionID)
const stub = env.SYNC_SERVER.get(id)
let shareID = await stub.getShareID()
if (!shareID) {
shareID = randomUUID()
await stub.setShareID(shareID)
}
// Store session ID
await Resource.Bucket.put(`${shareID}/session/id`, sessionID)
return new Response(JSON.stringify({ shareID }), {
headers: { "Content-Type": "application/json" },
})
}
if (request.method === "POST" && url.pathname.endsWith("/share_delete")) {
const body = await request.json()
const sessionID = body.sessionID
const shareID = body.shareID
// Delete from bucket
await Resource.Bucket.delete(`${shareID}/session/id`)
// Delete from durable object
const id = env.SYNC_SERVER.idFromName(sessionID)
const stub = env.SYNC_SERVER.get(id)
await stub.clear()
return new Response(JSON.stringify({}), {
headers: { "Content-Type": "application/json" },
})
}
if (request.method === "POST" && url.pathname.endsWith("/share_sync")) {
const body = await request.json()
const sessionID = body.sessionID
const shareID = body.shareID
const key = body.key
const content = body.content
// validate key
if (
!key.startsWith(`session/info/${sessionID}`) &&
!key.startsWith(`session/message/${sessionID}/`)
)
return new Response("Error: Invalid key", { status: 400 })
const ret = await Resource.Bucket.get(`${shareID}/session/id`)
if (!ret)
return new Response("Error: Session not shared", { status: 400 })
// send message to server
const id = env.SYNC_SERVER.idFromName(sessionID)
const stub = env.SYNC_SERVER.get(id)
await stub.publish(key, content)
// store message
await Resource.Bucket.put(`${shareID}/${key}.json`, content)
return new Response(JSON.stringify({}), {
headers: { "Content-Type": "application/json" },
})
}
if (request.method === "GET" && url.pathname.endsWith("/share_poll")) {
// Expect to receive a WebSocket Upgrade request.
// If there is one, accept the request and return a WebSocket Response.
const upgradeHeader = request.headers.get("Upgrade")
if (!upgradeHeader || upgradeHeader !== "websocket") {
return new Response("Error: Upgrade header is required", {
status: 426,
})
}
// get query parameters
const shareID = url.searchParams.get("shareID")
if (!shareID)
return new Response("Error: Share ID is required", { status: 400 })
// Get session ID
const sessionID = await Resource.Bucket.get(`${shareID}/session/id`).then(
(res) => res?.text(),
)
console.log("sessionID", sessionID)
if (!sessionID)
return new Response("Error: Session not shared", { status: 400 })
// subscribe to server
const id = env.SYNC_SERVER.idFromName(sessionID)
const stub = env.SYNC_SERVER.get(id)
return stub.fetch(request)
}
},
}
|
