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[fix]: eliminate race condition in SocketController (#769)

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* [fix]: eliminate race condition in SocketController

* [refactor]: use sequence- rather than iterator-based iteration

* [fix]: remove now-superfluous await

---------

Co-authored-by: Max Goedjen <max.goedjen@gmail.com>
This commit is contained in:
Jamie 2025-12-06 17:27:45 -06:00 committed by GitHub
parent a3bfcb316c
commit d82f404166
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GPG Key ID: B5690EEEBB952194
2 changed files with 19 additions and 11 deletions
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28
Sources/Packages/Sources/SecretAgentKit/SocketController.swift
View File

@ -37,7 +37,13 @@ public struct SocketController {
port = SocketPort(path: path)
fileHandle = FileHandle(fileDescriptor: port.socket, closeOnDealloc: true)
Task { @MainActor [fileHandle, sessionsContinuation, logger] in
for await notification in NotificationCenter.default.notifications(named: .NSFileHandleConnectionAccepted) {
// Create the sequence before triggering the notification to
// ensure it will not be missed.
let connectionAcceptedNotifications = NotificationCenter.default.notifications(named: .NSFileHandleConnectionAccepted)
fileHandle.acceptConnectionInBackgroundAndNotify()
for await notification in connectionAcceptedNotifications {
logger.debug("Socket controller accepted connection")
guard let new = notification.userInfo?[NSFileHandleNotificationFileHandleItem] as? FileHandle else { continue }
let session = Session(fileHandle: new)
@ -45,7 +51,6 @@ public struct SocketController {
fileHandle.acceptConnectionInBackgroundAndNotify()
}
}
fileHandle.acceptConnectionInBackgroundAndNotify()
logger.debug("Socket listening at \(path)")
}
@ -77,8 +82,14 @@ extension SocketController {
self.fileHandle = fileHandle
provenance = SigningRequestTracer().provenance(from: fileHandle)
(messages, messagesContinuation) = AsyncStream.makeStream()
Task { [messagesContinuation, logger] in
for await _ in NotificationCenter.default.notifications(named: .NSFileHandleDataAvailable, object: fileHandle) {
Task { @MainActor [messagesContinuation, logger] in
// Create the sequence before triggering the notification to
// ensure it will not be missed.
let dataAvailableNotifications = NotificationCenter.default.notifications(named: .NSFileHandleDataAvailable, object: fileHandle)
fileHandle.waitForDataInBackgroundAndNotify()
for await _ in dataAvailableNotifications {
let data = fileHandle.availableData
guard !data.isEmpty else {
logger.debug("Socket controller received empty data, ending continuation.")
@ -90,16 +101,13 @@ extension SocketController {
logger.debug("Socket controller yielded data.")
}
}
fileHandle.waitForDataInBackgroundAndNotify()
}
/// Writes new data to the socket.
/// - Parameter data: The data to write.
public func write(_ data: Data) async throws {
try fileHandle.write(contentsOf: data)
await MainActor.run {
fileHandle.waitForDataInBackgroundAndNotify()
}
@MainActor public func write(_ data: Data) throws {
try fileHandle.write(contentsOf: data)
fileHandle.waitForDataInBackgroundAndNotify()
}
/// Closes the socket and cleans up resources.

2
Sources/SecretAgent/AppDelegate.swift
View File

@ -42,7 +42,7 @@ class AppDelegate: NSObject, NSApplicationDelegate {
for await message in session.messages {
let request = try await inputParser.parse(data: message)
let agentResponse = await agent.handle(request: request, provenance: session.provenance)
try await session.write(agentResponse)
try session.write(agentResponse)
}
} catch {
try session.close()