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refactor: improve readability of the connection manager code

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This commit is contained in:
James Murdza 2024-10-25 19:23:11 -06:00
parent 90ea90f610
commit 6b2b870020
2 changed files with 38 additions and 31 deletions
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30
backend/server/src/ConnectionManager.ts
View File

@ -18,31 +18,39 @@ class Counter {
// Owner Connection Management
export class ConnectionManager {
// Counts how many times the owner is connected to a sandbox
private ownerConnections: Record<string, Counter> = {}
// Stores all sockets connected to a given sandbox
private sockets: Record<string, Set<Socket>> = {}
ownerConnected(sandboxId: string) {
this.ownerConnections[sandboxId] ??= new Counter()
this.ownerConnections[sandboxId].increment()
}
ownerDisconnected(sandboxId: string) {
this.ownerConnections[sandboxId]?.decrement()
}
// Checks if the owner of a sandbox is connected
ownerIsConnected(sandboxId: string): boolean {
return this.ownerConnections[sandboxId]?.getValue() > 0
}
addConnectionForSandbox(socket: Socket, sandboxId: string) {
// Adds a connection for a sandbox
addConnectionForSandbox(socket: Socket, sandboxId: string, isOwner: boolean) {
this.sockets[sandboxId] ??= new Set()
this.sockets[sandboxId].add(socket)
// If the connection is for the owner, increments the owner connection counter
if (isOwner) {
this.ownerConnections[sandboxId] ??= new Counter()
this.ownerConnections[sandboxId].increment()
}
}
removeConnectionForSandbox(socket: Socket, sandboxId: string) {
// Removes a connection for a sandbox
removeConnectionForSandbox(socket: Socket, sandboxId: string, isOwner: boolean) {
this.sockets[sandboxId]?.delete(socket)
// If the connection being removed is for the owner, decrements the owner connection counter
if (isOwner) {
this.ownerConnections[sandboxId]?.decrement()
}
}
// Returns the set of sockets connected to a given sandbox
connectionsForSandbox(sandboxId: string): Set<Socket> {
return this.sockets[sandboxId] ?? new Set();
}

21
backend/server/src/index.ts
View File

@ -98,16 +98,14 @@ io.on("connection", async (socket) => {
isOwner: boolean
}
// Register the connection
connections.addConnectionForSandbox(socket, data.sandboxId, data.isOwner)
// Disable access unless the sandbox owner is connected
if (data.isOwner) {
connections.ownerConnected(data.sandboxId)
} else {
if (!connections.ownerIsConnected(data.sandboxId)) {
if (!data.isOwner && !connections.ownerIsConnected(data.sandboxId)) {
socket.emit("disableAccess", "The sandbox owner is not connected.")
return
}
}
connections.addConnectionForSandbox(socket, data.sandboxId)
try {
// Create or retrieve the sandbox manager for the given sandbox ID
@ -119,6 +117,7 @@ io.on("connection", async (socket) => {
)
sandboxes[data.sandboxId] = sandboxManager
// This callback recieves an update when the file list changes, and notifies all relevant connections.
const sendFileNotifications = (files: (TFolder | TFile)[]) => {
connections.connectionsForSandbox(data.sandboxId).forEach((socket: Socket) => {
socket.emit("loaded", files);
@ -131,6 +130,8 @@ io.on("connection", async (socket) => {
socket.emit("loaded", sandboxManager.fileManager?.files)
// Register event handlers for the sandbox
// For each event handler, listen on the socket for that event
// Pass connection-specific information to the handlers
Object.entries(sandboxManager.handlers({
userId: data.userId,
isOwner: data.isOwner,
@ -149,20 +150,18 @@ io.on("connection", async (socket) => {
// Handle disconnection event
socket.on("disconnect", async () => {
try {
connections.removeConnectionForSandbox(socket, data.sandboxId)
// Deregister the connection
connections.removeConnectionForSandbox(socket, data.sandboxId, data.isOwner)
if (data.isOwner) {
connections.ownerDisconnected(data.sandboxId)
// If the owner has disconnected from all sockets, close open terminals and file watchers.o
// The sandbox itself will timeout after the heartbeat stops.
if (!connections.ownerIsConnected(data.sandboxId)) {
if (data.isOwner && !connections.ownerIsConnected(data.sandboxId)) {
await sandboxManager.disconnect()
socket.broadcast.emit(
"disableAccess",
"The sandbox owner has disconnected."
)
}
}
} catch (e: any) {
handleErrors("Error disconnecting:", e, socket);
}