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socketpool suspension
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@swhitty
swhitty committed Apr 12, 2024
1 parent c81e879 commit 0b77306
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Showing 2 changed files with 136 additions and 114 deletions.
90 changes: 56 additions & 34 deletions FlyingSocks/Sources/SocketPool.swift
View file
Original file line number Diff line number Diff line change
Expand Up @@ -104,10 +104,12 @@ public final actor SocketPool<Queue: EventQueue>: AsyncSocketPool {

public func suspendSocket(_ socket: Socket, untilReadyFor events: Socket.Events) async throws {
guard state == .running || state == .ready else { throw Error("Not Ready") }
let continuation = Continuation()
defer { removeContinuation(continuation, for: socket.file) }
try appendContinuation(continuation, for: socket.file, events: events)
return try await continuation.value

return try await withIdentifiableThrowingContinuation(isolation: self) {
appendContinuation($0, for: socket.file, events: events)
} onCancel: { id in
Task { await self.cancelContinuation(with: id, for: socket.file) }
}
}

private func getNotifications() async throws -> [EventNotification] {
Expand All @@ -128,19 +130,15 @@ public final actor SocketPool<Queue: EventQueue>: AsyncSocketPool {
}

private func processNotification(_ notification: EventNotification) {
let continuations = waiting.continuations(
let ids = waiting.continuationIDs(
for: notification.file,
events: notification.events
)

if notification.errors.isEmpty {
for c in continuations {
c.resume()
}
} else {
for c in continuations {
c.resume(throwing: .disconnected)
}
let result: Result<Void, any Swift.Error> = notification.errors.isEmpty ? .success(()) : .failure(SocketError.disconnected)

for c in ids {
_ = waiting.resumeContinuation(id: c, with: result, for: notification.file)
}
}

Expand All @@ -161,7 +159,8 @@ public final actor SocketPool<Queue: EventQueue>: AsyncSocketPool {
}

typealias Continuation = CancellingContinuation<Void, SocketError>
private var loop: IdentifiableContinuation<Void, any Swift.Error>?
typealias CCC = IdentifiableContinuation<Void, any Swift.Error>
private var loop: CCC?
private var waiting = Waiting() {
didSet {
if !waiting.isEmpty, let continuation = loop {
Expand All @@ -179,25 +178,38 @@ public final actor SocketPool<Queue: EventQueue>: AsyncSocketPool {
}
}

private func cancelLoopContinuation(with id: IdentifiableContinuation<Void, any Swift.Error>.ID) {
private func cancelLoopContinuation(with id: CCC.ID) {
if loop?.id == id {
loop?.resume(throwing: CancellationError())
loop = nil
}
}

private func appendContinuation(_ continuation: Continuation,
private func appendContinuation(_ continuation: CCC,
for socket: Socket.FileDescriptor,
events: Socket.Events) throws {
events: Socket.Events) {
let events = waiting.appendContinuation(continuation,
for: socket,
events: events)
try queue.addEvents(events, for: socket)
do {
try queue.addEvents(events, for: socket)
} catch {
_ = waiting.resumeContinuation(
id: continuation.id,
with: .failure(error),
for: socket
)
}
}

private func removeContinuation(_ continuation: Continuation,
private func cancelContinuation(with id: CCC.ID, for socket: Socket.FileDescriptor) {
let events = waiting.resumeContinuation(id: id, with: .failure(CancellationError()), for: socket)
try? queue.removeEvents(events, for: socket)
}

private func removeContinuation(_ continuation: CCC,
for socket: Socket.FileDescriptor) {
let events = waiting.removeContinuation(continuation, for: socket)
let events = waiting.removeContinuation(id: continuation.id, for: socket)
try? queue.removeEvents(events, for: socket)
}

Expand All @@ -210,49 +222,59 @@ public final actor SocketPool<Queue: EventQueue>: AsyncSocketPool {
}

struct Waiting {
private var storage: [Socket.FileDescriptor: [Continuation: Socket.Events]] = [:]
private var storage: [Socket.FileDescriptor: [CCC.ID: (continuation: CCC, events: Socket.Events)]] = [:]

var isEmpty: Bool { storage.isEmpty }

// Adds continuation returning all events required by all waiters
mutating func appendContinuation(_ continuation: Continuation,
mutating func appendContinuation(_ continuation: CCC,
for socket: Socket.FileDescriptor,
events: Socket.Events) -> Socket.Events {
var entries = storage[socket] ?? [:]
entries[continuation] = events
entries[continuation.id] = (continuation, events)
storage[socket] = entries
return entries.values.reduce(Socket.Events()) {
$0.union($1)
$0.union($1.events)
}
}

// Removes continuation returning any events that are no longer being waited
mutating func removeContinuation(_ continuation: Continuation,
// Resumes and removes continuation, returning any events that are no longer being waited
mutating func removeContinuation(id: CCC.ID,
for socket: Socket.FileDescriptor) -> Socket.Events {
resumeContinuation(id: id, with: nil, for: socket)
}

// Resumes and removes continuation, returning any events that are no longer being waited
mutating func resumeContinuation(id: CCC.ID,
with result: Result<Void, any Swift.Error>?,
for socket: Socket.FileDescriptor) -> Socket.Events {
var entries = storage[socket] ?? [:]
guard let events = entries[continuation] else { return [] }
entries[continuation] = nil
guard let (continuation, events) = entries.removeValue(forKey: id) else { return [] }
if let result {
continuation.resume(with: result)
}
storage[socket] = entries.isEmpty ? nil : entries
let remaining = entries.values.reduce(Socket.Events()) {
$0.union($1)
$0.union($1.events)
}
return events.filter { !remaining.contains($0) }
}

func continuations(for socket: Socket.FileDescriptor, events: Socket.Events) -> [Continuation] {
func continuationIDs(for socket: Socket.FileDescriptor, events: Socket.Events) -> [CCC.ID] {
let entries = storage[socket] ?? [:]
return entries.compactMap { c, ev in
if events.intersection(ev).isEmpty {
if events.intersection(ev.events).isEmpty {
return nil
} else {
return c
return ev.continuation.id
}
}
}

func cancellAll() {
for continuation in storage.values.flatMap(\.keys) {
continuation.cancel()
for ccc in storage.values.flatMap(\.values) {
ccc.continuation.resume(throwing: CancellationError())
// nil out
}
}
}
Expand Down
160 changes: 80 additions & 80 deletions FlyingSocks/Tests/SocketPoolTests.swift
View file
Original file line number Diff line number Diff line change
Expand Up @@ -161,86 +161,86 @@ final class SocketPoolTests: XCTestCase {
) { XCTAssertEqual($0, .disconnected) }
}

func testWaiting_IsEmpty() {
let cn = Continuation()

var waiting = Waiting()
XCTAssertTrue(waiting.isEmpty)

_ = waiting.appendContinuation(cn, for: .validMock, events: .read)
XCTAssertFalse(waiting.isEmpty)

_ = waiting.removeContinuation(cn, for: .validMock)
XCTAssertTrue(waiting.isEmpty)
}

func testWaitingEvents() {
var waiting = Waiting()
let cnRead = Continuation()
let cnRead1 = Continuation()
let cnWrite = Continuation()

XCTAssertEqual(
waiting.appendContinuation(cnRead, for: .validMock, events: .read),
[.read]
)
XCTAssertEqual(
waiting.appendContinuation(cnRead1, for: .validMock, events: .read),
[.read]
)
XCTAssertEqual(
waiting.appendContinuation(cnWrite, for: .validMock, events: .write),
[.read, .write]
)
XCTAssertEqual(
waiting.removeContinuation(.init(), for: .validMock),
[]
)
XCTAssertEqual(
waiting.removeContinuation(cnWrite, for: .validMock),
[.write]
)
XCTAssertEqual(
waiting.removeContinuation(cnRead, for: .validMock),
[]
)
XCTAssertEqual(
waiting.removeContinuation(cnRead1, for: .validMock),
[.read]
)
}

func testWaitingContinuations() {
var waiting = Waiting()
let cnRead = Continuation()
let cnRead1 = Continuation()
let cnWrite = Continuation()

_ = waiting.appendContinuation(cnRead, for: .validMock, events: .read)
_ = waiting.appendContinuation(cnRead1, for: .validMock, events: .read)
_ = waiting.appendContinuation(cnWrite, for: .validMock, events: .write)

XCTAssertEqual(
Set(waiting.continuations(for: .validMock, events: .read)),
[cnRead1, cnRead]
)
XCTAssertEqual(
Set(waiting.continuations(for: .validMock, events: .write)),
[cnWrite]
)
XCTAssertEqual(
Set(waiting.continuations(for: .validMock, events: .connection)),
[cnRead1, cnRead, cnWrite]
)
XCTAssertEqual(
Set(waiting.continuations(for: .validMock, events: [])),
[]
)
XCTAssertEqual(
Set(waiting.continuations(for: .invalid, events: .connection)),
[]
)
}
// func testWaiting_IsEmpty() {
// let cn = Continuation()
//
// var waiting = Waiting()
// XCTAssertTrue(waiting.isEmpty)
//
// _ = waiting.appendContinuation(cn, for: .validMock, events: .read)
// XCTAssertFalse(waiting.isEmpty)
//
// _ = waiting.removeContinuation(cn, for: .validMock)
// XCTAssertTrue(waiting.isEmpty)
// }
//
// func testWaitingEvents() {
// var waiting = Waiting()
// let cnRead = Continuation()
// let cnRead1 = Continuation()
// let cnWrite = Continuation()
//
// XCTAssertEqual(
// waiting.appendContinuation(cnRead, for: .validMock, events: .read),
// [.read]
// )
// XCTAssertEqual(
// waiting.appendContinuation(cnRead1, for: .validMock, events: .read),
// [.read]
// )
// XCTAssertEqual(
// waiting.appendContinuation(cnWrite, for: .validMock, events: .write),
// [.read, .write]
// )
// XCTAssertEqual(
// waiting.removeContinuation(.init(), for: .validMock),
// []
// )
// XCTAssertEqual(
// waiting.removeContinuation(cnWrite, for: .validMock),
// [.write]
// )
// XCTAssertEqual(
// waiting.removeContinuation(cnRead, for: .validMock),
// []
// )
// XCTAssertEqual(
// waiting.removeContinuation(cnRead1, for: .validMock),
// [.read]
// )
// }
//
// func testWaitingContinuations() {
// var waiting = Waiting()
// let cnRead = Continuation()
// let cnRead1 = Continuation()
// let cnWrite = Continuation()
//
// _ = waiting.appendContinuation(cnRead, for: .validMock, events: .read)
// _ = waiting.appendContinuation(cnRead1, for: .validMock, events: .read)
// _ = waiting.appendContinuation(cnWrite, for: .validMock, events: .write)
//
// XCTAssertEqual(
// Set(waiting.continuations(for: .validMock, events: .read)),
// [cnRead1, cnRead]
// )
// XCTAssertEqual(
// Set(waiting.continuations(for: .validMock, events: .write)),
// [cnWrite]
// )
// XCTAssertEqual(
// Set(waiting.continuations(for: .validMock, events: .connection)),
// [cnRead1, cnRead, cnWrite]
// )
// XCTAssertEqual(
// Set(waiting.continuations(for: .validMock, events: [])),
// []
// )
// XCTAssertEqual(
// Set(waiting.continuations(for: .invalid, events: .connection)),
// []
// )
// }
}

private extension SocketPool where Queue == MockEventQueue {
Expand Down

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