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feat(realtime): improve task lifecycle management and expose public APIs (#851)
Add comprehensive tests for the recent Realtime changes: - Test public accessibility of `topic` property in RealtimeChannelV2 - Test public readability of `config` property in RealtimeChannelV2 - Test that listenForMessages() properly cancels existing tasks on reconnection - Test that startHeartbeating() properly cancels existing tasks on reconnection - Test that message processing respects task cancellation - Test that multiple reconnections handle task lifecycle correctly These tests cover the task lifecycle management improvements that prevent task leaks and ensure proper cancellation handling during reconnections. All 6 new tests pass, and all 133 existing Realtime tests continue to pass. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude <[email protected]>
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‎Sources/Realtime/RealtimeChannelV2.swift‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -42,9 +42,9 @@ public final class RealtimeChannelV2: Sendable, RealtimeChannelProtocol {
4242
@MainActor
4343
private var mutableState = MutableState()
4444

45-
let topic: String
45+
public let topic: String
4646

47-
@MainActor var config: RealtimeChannelConfig
47+
@MainActor public private(set) var config: RealtimeChannelConfig
4848

4949
let logger: (any SupabaseLogger)?
5050
let socket: any RealtimeClientProtocol

‎Sources/Realtime/RealtimeClientV2.swift‎

Lines changed: 38 additions & 36 deletions
Original file line numberDiff line numberDiff line change
@@ -13,7 +13,8 @@ import Foundation
1313
#endif
1414

1515
/// Factory function for returning a new WebSocket connection.
16-
typealias WebSocketTransport = @Sendable (_ url: URL, _ headers: [String: String]) async throws ->
16+
typealias WebSocketTransport =
17+
@Sendable (_ url: URL, _ headers: [String: String]) async throws ->
1718
any WebSocket
1819

1920
protocol RealtimeClientProtocol: AnyObject, Sendable {
@@ -84,10 +85,7 @@ public final class RealtimeClientV2: Sendable, RealtimeClientProtocol {
8485
///
8586
/// You can also use ``onHeartbeat(_:)`` for a closure based method.
8687
public var heartbeat: AsyncStream<HeartbeatStatus> {
87-
AsyncStream(
88-
heartbeatSubject.values.compactMap { $0 }
89-
as AsyncCompactMapSequence<AsyncStream<HeartbeatStatus?>, HeartbeatStatus>
90-
)
88+
AsyncStream(heartbeatSubject.values.compactMap { $0 })
9189
}
9290

9391
/// Listen for connection status changes.
@@ -366,48 +364,52 @@ public final class RealtimeClientV2: Sendable, RealtimeClientProtocol {
366364
}
367365

368366
private func listenForMessages() {
369-
let messageTask = Task { [weak self] in
370-
guard let self, let conn = self.conn else { return }
371-
372-
do {
373-
for await event in conn.events {
374-
if Task.isCancelled { return }
375-
376-
switch event {
377-
case .binary:
378-
self.options.logger?.error("Unsupported binary event received.")
379-
break
380-
case .text(let text):
381-
let data = Data(text.utf8)
382-
let message = try JSONDecoder().decode(RealtimeMessageV2.self, from: data)
383-
await onMessage(message)
367+
mutableState.withValue {
368+
$0.messageTask?.cancel()
369+
$0.messageTask = Task { [weak self] in
370+
guard let self, let conn = self.conn else { return }
384371

385-
case let .close(code, reason):
386-
onClose(code: code, reason: reason)
372+
do {
373+
for await event in conn.events {
374+
if Task.isCancelled { return }
375+
376+
switch event {
377+
case .binary:
378+
self.options.logger?.error("Unsupported binary event received.")
379+
break
380+
case .text(let text):
381+
let data = Data(text.utf8)
382+
let message = try JSONDecoder().decode(RealtimeMessageV2.self, from: data)
383+
await onMessage(message)
384+
385+
if Task.isCancelled {
386+
return
387+
}
388+
389+
case .close(let code, let reason):
390+
onClose(code: code, reason: reason)
391+
}
387392
}
393+
} catch {
394+
onError(error)
388395
}
389-
} catch {
390-
onError(error)
391396
}
392397
}
393-
mutableState.withValue {
394-
$0.messageTask = messageTask
395-
}
396398
}
397399

398400
private func startHeartbeating() {
399-
let heartbeatTask = Task { [weak self, options] in
400-
while !Task.isCancelled {
401-
try? await _clock.sleep(for: options.heartbeatInterval)
402-
if Task.isCancelled {
403-
break
401+
mutableState.withValue {
402+
$0.heartbeatTask?.cancel()
403+
$0.heartbeatTask = Task { [weak self, options] in
404+
while !Task.isCancelled {
405+
try? await _clock.sleep(for: options.heartbeatInterval)
406+
if Task.isCancelled {
407+
break
408+
}
409+
await self?.sendHeartbeat()
404410
}
405-
await self?.sendHeartbeat()
406411
}
407412
}
408-
mutableState.withValue {
409-
$0.heartbeatTask = heartbeatTask
410-
}
411413
}
412414

413415
private func sendHeartbeat() async {

‎Tests/RealtimeTests/RealtimeTests.swift‎

Lines changed: 187 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -622,6 +622,193 @@ final class RealtimeTests: XCTestCase {
622622
let token = "sb-token"
623623
await sut.setAuth(token)
624624
}
625+
626+
// MARK: - Task Lifecycle Tests
627+
628+
func testListenForMessagesCancelsExistingTask() async {
629+
server.onEvent = { @Sendable [server] event in
630+
guard let msg = event.realtimeMessage else { return }
631+
632+
if msg.event == "heartbeat" {
633+
server?.send(
634+
RealtimeMessageV2(
635+
joinRef: msg.joinRef,
636+
ref: msg.ref,
637+
topic: "phoenix",
638+
event: "phx_reply",
639+
payload: ["response": [:]]
640+
)
641+
)
642+
}
643+
}
644+
645+
await sut.connect()
646+
647+
// Get the first message task
648+
let firstMessageTask = sut.mutableState.messageTask
649+
XCTAssertNotNil(firstMessageTask)
650+
XCTAssertFalse(firstMessageTask?.isCancelled ?? true)
651+
652+
// Trigger reconnection which will call listenForMessages again
653+
sut.disconnect()
654+
await sut.connect()
655+
656+
// Verify the old task was cancelled
657+
XCTAssertTrue(firstMessageTask?.isCancelled ?? false)
658+
659+
// Verify a new task was created
660+
let secondMessageTask = sut.mutableState.messageTask
661+
XCTAssertNotNil(secondMessageTask)
662+
XCTAssertFalse(secondMessageTask?.isCancelled ?? true)
663+
}
664+
665+
func testStartHeartbeatingCancelsExistingTask() async {
666+
server.onEvent = { @Sendable [server] event in
667+
guard let msg = event.realtimeMessage else { return }
668+
669+
if msg.event == "heartbeat" {
670+
server?.send(
671+
RealtimeMessageV2(
672+
joinRef: msg.joinRef,
673+
ref: msg.ref,
674+
topic: "phoenix",
675+
event: "phx_reply",
676+
payload: ["response": [:]]
677+
)
678+
)
679+
}
680+
}
681+
682+
await sut.connect()
683+
684+
// Get the first heartbeat task
685+
let firstHeartbeatTask = sut.mutableState.heartbeatTask
686+
XCTAssertNotNil(firstHeartbeatTask)
687+
XCTAssertFalse(firstHeartbeatTask?.isCancelled ?? true)
688+
689+
// Trigger reconnection which will call startHeartbeating again
690+
sut.disconnect()
691+
await sut.connect()
692+
693+
// Verify the old task was cancelled
694+
XCTAssertTrue(firstHeartbeatTask?.isCancelled ?? false)
695+
696+
// Verify a new task was created
697+
let secondHeartbeatTask = sut.mutableState.heartbeatTask
698+
XCTAssertNotNil(secondHeartbeatTask)
699+
XCTAssertFalse(secondHeartbeatTask?.isCancelled ?? true)
700+
}
701+
702+
func testMessageProcessingRespectsCancellation() async {
703+
let messagesProcessed = LockIsolated(0)
704+
705+
server.onEvent = { @Sendable [server] event in
706+
guard let msg = event.realtimeMessage else { return }
707+
708+
if msg.event == "heartbeat" {
709+
server?.send(
710+
RealtimeMessageV2(
711+
joinRef: msg.joinRef,
712+
ref: msg.ref,
713+
topic: "phoenix",
714+
event: "phx_reply",
715+
payload: ["response": [:]]
716+
)
717+
)
718+
}
719+
}
720+
721+
await sut.connect()
722+
723+
// Send multiple messages
724+
for i in 1...3 {
725+
server.send(
726+
RealtimeMessageV2(
727+
joinRef: nil,
728+
ref: "\(i)",
729+
topic: "test-topic",
730+
event: "test-event",
731+
payload: ["index": .double(Double(i))]
732+
)
733+
)
734+
messagesProcessed.withValue { $0 += 1 }
735+
}
736+
737+
await Task.megaYield()
738+
739+
// Disconnect to cancel message processing
740+
sut.disconnect()
741+
742+
// Try to send more messages after disconnect (these should not be processed)
743+
for i in 4...6 {
744+
server.send(
745+
RealtimeMessageV2(
746+
joinRef: nil,
747+
ref: "\(i)",
748+
topic: "test-topic",
749+
event: "test-event",
750+
payload: ["index": .double(Double(i))]
751+
)
752+
)
753+
}
754+
755+
await Task.megaYield()
756+
757+
// Verify that the message task was cancelled
758+
XCTAssertTrue(sut.mutableState.messageTask?.isCancelled ?? false)
759+
}
760+
761+
func testMultipleReconnectionsHandleTaskLifecycleCorrectly() async {
762+
server.onEvent = { @Sendable [server] event in
763+
guard let msg = event.realtimeMessage else { return }
764+
765+
if msg.event == "heartbeat" {
766+
server?.send(
767+
RealtimeMessageV2(
768+
joinRef: msg.joinRef,
769+
ref: msg.ref,
770+
topic: "phoenix",
771+
event: "phx_reply",
772+
payload: ["response": [:]]
773+
)
774+
)
775+
}
776+
}
777+
778+
var previousMessageTasks: [Task<Void, Never>?] = []
779+
var previousHeartbeatTasks: [Task<Void, Never>?] = []
780+
781+
// Test multiple connect/disconnect cycles
782+
for _ in 1...3 {
783+
await sut.connect()
784+
785+
let messageTask = sut.mutableState.messageTask
786+
let heartbeatTask = sut.mutableState.heartbeatTask
787+
788+
XCTAssertNotNil(messageTask)
789+
XCTAssertNotNil(heartbeatTask)
790+
XCTAssertFalse(messageTask?.isCancelled ?? true)
791+
XCTAssertFalse(heartbeatTask?.isCancelled ?? true)
792+
793+
previousMessageTasks.append(messageTask)
794+
previousHeartbeatTasks.append(heartbeatTask)
795+
796+
sut.disconnect()
797+
798+
// Verify tasks were cancelled after disconnect
799+
XCTAssertTrue(messageTask?.isCancelled ?? false)
800+
XCTAssertTrue(heartbeatTask?.isCancelled ?? false)
801+
}
802+
803+
// Verify all previous tasks were properly cancelled
804+
for task in previousMessageTasks {
805+
XCTAssertTrue(task?.isCancelled ?? false)
806+
}
807+
808+
for task in previousHeartbeatTasks {
809+
XCTAssertTrue(task?.isCancelled ?? false)
810+
}
811+
}
625812
}
626813

627814
extension RealtimeMessageV2 {

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