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Only fetch channels and create contributors for enabled features
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Resolves #105.

[1] ably/specification#237
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@lawrence-forooghian
lawrence-forooghian committed Nov 21, 2024
1 parent eb32620 commit c695feb
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Showing 2 changed files with 112 additions and 66 deletions.
125 changes: 87 additions & 38 deletions Sources/AblyChat/Room.swift
View file
Original file line number Diff line number Diff line change
Expand Up @@ -73,6 +73,51 @@ internal actor DefaultRoom<LifecycleManagerFactory: RoomLifecycleManagerFactory>

private let logger: InternalLogger

private enum RoomFeatureWithOptions {
case messages
case presence(PresenceOptions)
case typing(TypingOptions)
case reactions(RoomReactionsOptions)
case occupancy(OccupancyOptions)

var toRoomFeature: RoomFeature {
switch self {
case .messages:
.messages
case .presence:
.presence
case .typing:
.typing
case .reactions:
.reactions
case .occupancy:
.occupancy
}
}

static func fromRoomOptions(_ roomOptions: RoomOptions) -> [Self] {
var result: [Self] = [.messages]

if let presenceOptions = roomOptions.presence {
result.append(.presence(presenceOptions))
}

if let typingOptions = roomOptions.typing {
result.append(.typing(typingOptions))
}

if let reactionsOptions = roomOptions.reactions {
result.append(.reactions(reactionsOptions))
}

if let occupancyOptions = roomOptions.occupancy {
result.append(.occupancy(occupancyOptions))
}

return result
}
}

internal init(realtime: RealtimeClient, chatAPI: ChatAPI, roomID: String, options: RoomOptions, logger: InternalLogger, lifecycleManagerFactory: LifecycleManagerFactory) async throws {
self.realtime = realtime
self.roomID = roomID
Expand All @@ -84,7 +129,9 @@ internal actor DefaultRoom<LifecycleManagerFactory: RoomLifecycleManagerFactory>
throw ARTErrorInfo.create(withCode: 40000, message: "Ensure your Realtime instance is initialized with a clientId.")
}

let featureChannelPartialDependencies = Self.createFeatureChannelPartialDependencies(roomID: roomID, roomOptions: options, realtime: realtime)
let featuresWithOptions = RoomFeatureWithOptions.fromRoomOptions(options)

let featureChannelPartialDependencies = Self.createFeatureChannelPartialDependencies(roomID: roomID, featuresWithOptions: featuresWithOptions, realtime: realtime)
channels = featureChannelPartialDependencies.mapValues(\.channel)
let contributors = featureChannelPartialDependencies.values.map(\.contributor)

Expand All @@ -95,8 +142,6 @@ internal actor DefaultRoom<LifecycleManagerFactory: RoomLifecycleManagerFactory>

let featureChannels = Self.createFeatureChannels(partialDependencies: featureChannelPartialDependencies, lifecycleManager: lifecycleManager)

// TODO: Address force unwrapping of `channels` within feature initialisation below: https://github.com/ably-labs/ably-chat-swift/issues/105

messages = await DefaultMessages(
featureChannel: featureChannels[.messages]!,
chatAPI: chatAPI,
Expand All @@ -105,26 +150,38 @@ internal actor DefaultRoom<LifecycleManagerFactory: RoomLifecycleManagerFactory>
logger: logger
)

_reactions = options.reactions != nil ? await DefaultRoomReactions(
featureChannel: featureChannels[.reactions]!,
clientID: clientId,
roomID: roomID,
logger: logger
) : nil
_reactions = if let featureChannel = featureChannels[.reactions] {
await DefaultRoomReactions(
featureChannel: featureChannel,
clientID: clientId,
roomID: roomID,
logger: logger
)
} else {
nil
}

_presence = options.presence != nil ? await DefaultPresence(
featureChannel: featureChannels[.presence]!,
roomID: roomID,
clientID: clientId,
logger: logger
) : nil
_presence = if let featureChannel = featureChannels[.presence] {
await DefaultPresence(
featureChannel: featureChannel,
roomID: roomID,
clientID: clientId,
logger: logger
)
} else {
nil
}

_occupancy = options.occupancy != nil ? DefaultOccupancy(
featureChannel: featureChannels[.occupancy]!,
chatAPI: chatAPI,
roomID: roomID,
logger: logger
) : nil
_occupancy = if let featureChannel = featureChannels[.occupancy] {
DefaultOccupancy(
featureChannel: featureChannel,
chatAPI: chatAPI,
roomID: roomID,
logger: logger
)
} else {
nil
}
}

private struct FeatureChannelPartialDependencies {
Expand All @@ -133,53 +190,45 @@ internal actor DefaultRoom<LifecycleManagerFactory: RoomLifecycleManagerFactory>
}

/// The returned dictionary is guaranteed to have an entry for each element of `features`.
private static func createChannelsForFeatures(_ features: [RoomFeature], roomID: String, roomOptions _: RoomOptions, realtime: RealtimeClient) -> [RoomFeature: RealtimeChannelProtocol] {
private static func createChannelsForFeaturesWithOptions(_ featuresWithOptions: [RoomFeatureWithOptions], roomID: String, realtime: RealtimeClient) -> [RoomFeature: RealtimeChannelProtocol] {
// CHA-RC3a

// Multiple features can share a realtime channel. We fetch each realtime channel exactly once, merging the channel options for the various features that use this channel.

let featuresGroupedByChannelName = Dictionary(grouping: features) { $0.channelNameForRoomID(roomID) }
let featuresGroupedByChannelName = Dictionary(grouping: featuresWithOptions) { $0.toRoomFeature.channelNameForRoomID(roomID) }

let pairsOfFeatureAndChannel = featuresGroupedByChannelName.flatMap { channelName, features in
var channelOptions = RealtimeChannelOptions()

// channel setup for presence and occupancy
for feature in features {
if feature == .presence {
if case /* let */ .presence /* (presenceOptions) */ = feature {
// TODO: Restore this code once we understand weird Realtime behaviour and spec points (https://github.com/ably-labs/ably-chat-swift/issues/133)
/*
let presenceOptions = roomOptions.presence

if presenceOptions?.enter ?? false {
if presenceOptions.enter {
channelOptions.modes.insert(.presence)
}

if presenceOptions?.subscribe ?? false {
if presenceOptions.subscribe {
channelOptions.modes.insert(.presenceSubscribe)
}
*/
} else if feature == .occupancy {
} else if case .occupancy = feature {
var params: [String: String] = channelOptions.params ?? [:]
params["occupancy"] = "metrics"
channelOptions.params = params
}
}

let channel = realtime.getChannel(channelName, opts: channelOptions)
return features.map { ($0, channel) }
return features.map { ($0.toRoomFeature, channel) }
}

return Dictionary(uniqueKeysWithValues: pairsOfFeatureAndChannel)
}

private static func createFeatureChannelPartialDependencies(roomID: String, roomOptions: RoomOptions, realtime: RealtimeClient) -> [RoomFeature: FeatureChannelPartialDependencies] {
let features: [RoomFeature] = [
.messages,
.reactions,
.presence,
.occupancy,
]
let channelsByFeature = createChannelsForFeatures(features, roomID: roomID, roomOptions: roomOptions, realtime: realtime)
private static func createFeatureChannelPartialDependencies(roomID: String, featuresWithOptions: [RoomFeatureWithOptions], realtime: RealtimeClient) -> [RoomFeature: FeatureChannelPartialDependencies] {
let channelsByFeature = createChannelsForFeaturesWithOptions(featuresWithOptions, roomID: roomID, realtime: realtime)

return .init(uniqueKeysWithValues: channelsByFeature.map { feature, channel in
let contributor = DefaultRoomLifecycleContributor(channel: .init(underlyingChannel: channel), feature: feature)
Expand Down
53 changes: 25 additions & 28 deletions Tests/AblyChatTests/DefaultRoomTests.swift
View file
Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,6 @@ struct DefaultRoomTests {
// Given: A DefaultRoom instance
let channelsList = [
MockRealtimeChannel(name: "basketball::$chat::$chatMessages"),
MockRealtimeChannel(name: "basketball::$chat::$reactions"),
]
let channels = MockChannels(channels: channelsList)
let realtime = MockRealtime.create(channels: channels)
Expand All @@ -29,7 +28,6 @@ struct DefaultRoomTests {
// Given: A DefaultRoom instance, configured to use presence and occupancy
let channelsList = [
MockRealtimeChannel(name: "basketball::$chat::$chatMessages"),
MockRealtimeChannel(name: "basketball::$chat::$reactions"),
]
let channels = MockChannels(channels: channelsList)
let realtime = MockRealtime.create(channels: channels)
Expand All @@ -38,7 +36,7 @@ struct DefaultRoomTests {

// Then: It fetches the …$chatMessages channel (which is used by messages, presence, and occupancy) only once, and the options with which it does so are the result of merging the options used by the presence feature and those used by the occupancy feature
let channelsGetArguments = channels.getArguments
#expect(channelsGetArguments.map(\.name).sorted() == ["basketball::$chat::$chatMessages", "basketball::$chat::$reactions"])
#expect(channelsGetArguments.map(\.name).sorted() == ["basketball::$chat::$chatMessages"])

let chatMessagesChannelGetOptions = try #require(channelsGetArguments.first { $0.name == "basketball::$chat::$chatMessages" }?.options)
#expect(chatMessagesChannelGetOptions.params?["occupancy"] == "metrics")
Expand All @@ -54,7 +52,6 @@ struct DefaultRoomTests {
// Given: a DefaultRoom instance
let channelsList = [
MockRealtimeChannel(name: "basketball::$chat::$chatMessages"),
MockRealtimeChannel(name: "basketball::$chat::$reactions"), // required as DefaultRoom attaches reactions implicitly for now
]
let channels = MockChannels(channels: channelsList)
let realtime = MockRealtime.create(channels: channels)
Expand All @@ -64,32 +61,35 @@ struct DefaultRoomTests {
#expect(room.messages.channel.name == "basketball::$chat::$chatMessages")
}

// TODO: Only create contributors for features user has enabled (https://github.com/ably-labs/ably-chat-swift/issues/105)
// TODO: Only fetch channel for features user has enabled (https://github.com/ably-labs/ably-chat-swift/issues/105)
// @spec CHA-RC2c
// @spec CHA-RC2d
// @spec CHA-RC2f
@Test
func fetchesChannelAndCreatesLifecycleContributorForEachFeature() async throws {
// Given: a DefaultRoom instance
func fetchesChannelAndCreatesLifecycleContributorForEnabledFeatures() async throws {
// Given: a DefaultRoom instance, initialized with options that request that the room use a strict subset of the possible features
let channelsList = [
MockRealtimeChannel(name: "basketball::$chat::$chatMessages"),
MockRealtimeChannel(name: "basketball::$chat::$reactions"),
]
let channels = MockChannels(channels: channelsList)
let realtime = MockRealtime.create(channels: channels)
let roomOptions = RoomOptions(
presence: .init()
)
let lifecycleManagerFactory = MockRoomLifecycleManagerFactory()
_ = try await DefaultRoom(realtime: realtime, chatAPI: ChatAPI(realtime: realtime), roomID: "basketball", options: .init(), logger: TestLogger(), lifecycleManagerFactory: lifecycleManagerFactory)
_ = try await DefaultRoom(realtime: realtime, chatAPI: ChatAPI(realtime: realtime), roomID: "basketball", options: roomOptions, logger: TestLogger(), lifecycleManagerFactory: lifecycleManagerFactory)

// Then: It:
// - fetches the channel that corresponds to each feature (well, each one that we’ve currently implemented)
// - initializes the RoomLifecycleManager with a contributor for each feature (well, each one that we’ve currently implemented)
// - fetches the channel that corresponds to each feature requested by the room options, plus the messages feature
// - initializes the RoomLifecycleManager with a contributor for each feature requested by the room options, plus the messages feature
let lifecycleManagerCreationArguments = try #require(await lifecycleManagerFactory.createManagerArguments.first)
let expectedFeatures: [RoomFeature] = [.messages, .occupancy, .reactions, .presence]
let expectedFeatures: [RoomFeature] = [.messages, .presence] // messages is implicitly always turned on
#expect(lifecycleManagerCreationArguments.contributors.count == expectedFeatures.count)
#expect(Set(lifecycleManagerCreationArguments.contributors.map(\.feature)) == Set(expectedFeatures))

let channelsGetArguments = channels.getArguments
// This is the channel used by the messages and presence features
let expectedFetchedChannelNames = [
"basketball::$chat::$chatMessages",
"basketball::$chat::$reactions",
]
#expect(channelsGetArguments.count == expectedFetchedChannelNames.count)
#expect(Set(channelsGetArguments.map(\.name)) == Set(expectedFetchedChannelNames))
Expand All @@ -101,24 +101,26 @@ struct DefaultRoomTests {
@Test(arguments: [.messages, .presence, .reactions, .occupancy] as[RoomFeature])
func whenFeatureEnabled_propertyGetterReturns(feature: RoomFeature) async throws {
// Given: A RoomOptions with the (test argument `feature`) feature enabled in the room options
let roomOptions: RoomOptions = switch feature {
let roomOptions: RoomOptions
var namesOfChannelsToMock = ["basketball::$chat::$chatMessages"]
switch feature {
case .messages:
// Messages should always be enabled without needing any special options
.init()
roomOptions = .init()
case .presence:
.init(presence: .init())
roomOptions = .init(presence: .init())
case .reactions:
.init(reactions: .init())
roomOptions = .init(reactions: .init())
namesOfChannelsToMock.append("basketball::$chat::$reactions")
case .occupancy:
.init(occupancy: .init())
roomOptions = .init(occupancy: .init())
default:
fatalError("Unexpected feature \(feature)")
}

let channelsList = [
MockRealtimeChannel(name: "basketball::$chat::$chatMessages"),
MockRealtimeChannel(name: "basketball::$chat::$reactions"),
]
let channelsList = namesOfChannelsToMock.map { name in
MockRealtimeChannel(name: name)
}
let channels = MockChannels(channels: channelsList)
let realtime = MockRealtime.create(channels: channels)
let room = try await DefaultRoom(realtime: realtime, chatAPI: ChatAPI(realtime: realtime), roomID: "basketball", options: roomOptions, logger: TestLogger(), lifecycleManagerFactory: MockRoomLifecycleManagerFactory())
Expand Down Expand Up @@ -151,7 +153,6 @@ struct DefaultRoomTests {
// Given: a DefaultRoom instance
let channelsList = [
MockRealtimeChannel(name: "basketball::$chat::$chatMessages"),
MockRealtimeChannel(name: "basketball::$chat::$reactions"), // required as DefaultRoom attaches reactions implicitly for now
]
let channels = MockChannels(channels: channelsList)
let realtime = MockRealtime.create(channels: channels)
Expand Down Expand Up @@ -188,7 +189,6 @@ struct DefaultRoomTests {
// Given: a DefaultRoom instance
let channelsList = [
MockRealtimeChannel(name: "basketball::$chat::$chatMessages"),
MockRealtimeChannel(name: "basketball::$chat::$reactions"), // required as DefaultRoom attaches reactions implicitly for now
]
let channels = MockChannels(channels: channelsList)
let realtime = MockRealtime.create(channels: channels)
Expand Down Expand Up @@ -221,7 +221,6 @@ struct DefaultRoomTests {
// Given: a DefaultRoom instance
let channelsList = [
MockRealtimeChannel(name: "basketball::$chat::$chatMessages"),
MockRealtimeChannel(name: "basketball::$chat::$reactions"), // required as DefaultRoom attaches reactions implicitly for now
]
let channels = MockChannels(channels: channelsList)
let realtime = MockRealtime.create(channels: channels)
Expand All @@ -248,7 +247,6 @@ struct DefaultRoomTests {
// Given: a DefaultRoom instance
let channelsList = [
MockRealtimeChannel(name: "basketball::$chat::$chatMessages"),
MockRealtimeChannel(name: "basketball::$chat::$reactions"), // required as DefaultRoom attaches reactions implicitly for now
]
let channels = MockChannels(channels: channelsList)
let realtime = MockRealtime.create(channels: channels)
Expand All @@ -269,7 +267,6 @@ struct DefaultRoomTests {
// Given: a DefaultRoom instance
let channelsList = [
MockRealtimeChannel(name: "basketball::$chat::$chatMessages"),
MockRealtimeChannel(name: "basketball::$chat::$reactions"), // required as DefaultRoom attaches reactions implicitly for now
]
let channels = MockChannels(channels: channelsList)
let realtime = MockRealtime.create(channels: channels)
Expand Down

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