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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,58 +1,94 @@ | ||
| type DocumentStoreEntry = { | ||
| connections: Set<any>; | ||
| }; | ||
| import WebSocket from "ws"; | ||
| import { HasBroadcastAccessParams } from "../types"; | ||
|
|
||
| type ConnectionEntry = { websocketSessionKey: string; websocket: WebSocket }; | ||
|
|
||
| const documents: { [key: string]: DocumentStoreEntry } = {}; | ||
| const documents: { [key: string]: ConnectionEntry[] } = {}; | ||
| const messageQueues: { [key: string]: BroadcastMessageParams[] } = {}; | ||
|
|
||
| export type BroadcastMessageParams = { | ||
| documentId: string; | ||
| message: any; | ||
| currentClientConnection: any; | ||
| currentWebsocket: any; | ||
| hasBroadcastAccess: (params: HasBroadcastAccessParams) => Promise<boolean[]>; | ||
| }; | ||
|
|
||
| export const broadcastMessage = ({ | ||
| documentId, | ||
| message, | ||
| currentClientConnection, | ||
| }: BroadcastMessageParams) => { | ||
| documents[documentId]?.connections?.forEach((conn) => { | ||
| if (currentClientConnection !== conn) { | ||
| conn.send(JSON.stringify(message)); | ||
| } | ||
| // for debugging purposes | ||
| // conn.send(JSON.stringify(update)); | ||
| export const broadcastMessage = async (params: BroadcastMessageParams) => { | ||
| const { documentId } = params; | ||
|
|
||
| if (!messageQueues[documentId]) { | ||
| messageQueues[documentId] = []; | ||
| } | ||
|
|
||
| messageQueues[documentId].push(params); | ||
|
|
||
| // only start processing if this is the only message in the queue to avoid overlapping calls | ||
| if (messageQueues[documentId].length === 1) { | ||
| processMessageQueue(documentId); | ||
| } | ||
| }; | ||
|
|
||
| const processMessageQueue = async (documentId: string) => { | ||
| if (!documents[documentId] || messageQueues[documentId].length === 0) return; | ||
|
|
||
| const { hasBroadcastAccess } = messageQueues[documentId][0]; | ||
|
|
||
| const websocketSessionKeys = documents[documentId].map( | ||
| ({ websocketSessionKey }) => websocketSessionKey | ||
| ); | ||
|
|
||
| const accessResults = await hasBroadcastAccess({ | ||
| documentId, | ||
| websocketSessionKeys, | ||
| }); | ||
|
|
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| documents[documentId] = documents[documentId].filter( | ||
| (_, index) => accessResults[index] | ||
| ); | ||
|
|
||
| // Send all the messages in the queue to the allowed connections | ||
| messageQueues[documentId].forEach(({ message, currentWebsocket }) => { | ||
| documents[documentId].forEach(({ websocket }) => { | ||
| if (websocket !== currentWebsocket) { | ||
| websocket.send(JSON.stringify(message)); | ||
| } | ||
| }); | ||
| }); | ||
|
|
||
| // clear the message queue after it's broadcasted | ||
| messageQueues[documentId] = []; | ||
| }; | ||
|
|
||
| export type AddConnectionParams = { | ||
| documentId: string; | ||
| currentClientConnection: any; | ||
| websocket: WebSocket; | ||
| websocketSessionKey: string; | ||
| }; | ||
|
|
||
| export const addConnection = ({ | ||
| documentId, | ||
| currentClientConnection, | ||
| websocket, | ||
| websocketSessionKey, | ||
| }: AddConnectionParams) => { | ||
| if (documents[documentId]) { | ||
| documents[documentId].connections.add(currentClientConnection); | ||
| documents[documentId].push({ websocket, websocketSessionKey }); | ||
| } else { | ||
| documents[documentId] = { | ||
| connections: new Set<any>(), | ||
| }; | ||
| documents[documentId].connections.add(currentClientConnection); | ||
| documents[documentId] = [{ websocket, websocketSessionKey }]; | ||
| } | ||
| }; | ||
|
|
||
| export type RemoveConnectionParams = { | ||
| documentId: string; | ||
| currentClientConnection: any; | ||
| websocket: WebSocket; | ||
| }; | ||
|
|
||
| export const removeConnection = ({ | ||
| documentId, | ||
| currentClientConnection, | ||
| websocket: currentWebsocket, | ||
| }: RemoveConnectionParams) => { | ||
| if (documents[documentId]) { | ||
| documents[documentId].connections.delete(currentClientConnection); | ||
| documents[documentId] = documents[documentId].filter( | ||
| ({ websocket }) => websocket !== currentWebsocket | ||
| ); | ||
| } | ||
| }; |
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