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507 lines
25 KiB
Swift
507 lines
25 KiB
Swift
// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.
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import Foundation
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import Combine
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import GRDB
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import SessionSnodeKit
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import SessionUtilitiesKit
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extension OpenGroupAPI {
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public final class Poller {
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typealias PollResponse = [OpenGroupAPI.Endpoint: (info: OnionRequestResponseInfoType, data: Codable?)]
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private let server: String
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private var timer: Timer? = nil
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private var hasStarted: Bool = false
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private var isPolling: Bool = false
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// MARK: - Settings
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private static let minPollInterval: TimeInterval = 3
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private static let maxPollInterval: Double = (60 * 60)
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internal static let maxInactivityPeriod: Double = (14 * 24 * 60 * 60)
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// MARK: - Lifecycle
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public init(for server: String) {
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self.server = server
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}
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public func startIfNeeded(using dependencies: OpenGroupManager.OGMDependencies = OpenGroupManager.OGMDependencies()) {
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guard !hasStarted else { return }
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hasStarted = true
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pollRecursively(using: dependencies)
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}
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@objc public func stop() {
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timer?.invalidate()
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hasStarted = false
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}
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// MARK: - Polling
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private func pollRecursively(using dependencies: OpenGroupManager.OGMDependencies = OpenGroupManager.OGMDependencies()) {
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guard hasStarted else { return }
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let minPollFailureCount: TimeInterval = Storage.shared
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.read { db in
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try OpenGroup
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.filter(OpenGroup.Columns.server == server)
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.select(min(OpenGroup.Columns.pollFailureCount))
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.asRequest(of: TimeInterval.self)
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.fetchOne(db)
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}
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.defaulting(to: 0)
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let nextPollInterval: TimeInterval = getInterval(for: minPollFailureCount, minInterval: Poller.minPollInterval, maxInterval: Poller.maxPollInterval)
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poll(using: dependencies).sinkUntilComplete()
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timer = Timer.scheduledTimerOnMainThread(withTimeInterval: nextPollInterval, repeats: false) { [weak self] timer in
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timer.invalidate()
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Threading.pollerQueue.async {
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self?.pollRecursively(using: dependencies)
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}
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}
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}
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public func poll(
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using dependencies: OpenGroupManager.OGMDependencies = OpenGroupManager.OGMDependencies()
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) -> AnyPublisher<Void, Error> {
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return poll(
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calledFromBackgroundPoller: false,
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isPostCapabilitiesRetry: false,
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using: dependencies
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)
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}
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public func poll(
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calledFromBackgroundPoller: Bool,
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isBackgroundPollerValid: @escaping (() -> Bool) = { true },
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isPostCapabilitiesRetry: Bool,
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using dependencies: OpenGroupManager.OGMDependencies = OpenGroupManager.OGMDependencies()
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) -> AnyPublisher<Void, Error> {
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guard !self.isPolling else {
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return Just(())
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.setFailureType(to: Error.self)
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.eraseToAnyPublisher()
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}
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self.isPolling = true
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let server: String = self.server
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return dependencies.storage
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.readPublisherFlatMap { db -> AnyPublisher<(Int64, PollResponse), Error> in
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let failureCount: Int64 = (try? OpenGroup
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.select(max(OpenGroup.Columns.pollFailureCount))
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.asRequest(of: Int64.self)
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.fetchOne(db))
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.defaulting(to: 0)
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return OpenGroupAPI
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.poll(
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db,
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server: server,
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hasPerformedInitialPoll: dependencies.cache.hasPerformedInitialPoll[server] == true,
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timeSinceLastPoll: (
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dependencies.cache.timeSinceLastPoll[server] ??
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dependencies.cache.getTimeSinceLastOpen(using: dependencies)
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),
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using: dependencies
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)
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.map { response in (failureCount, response) }
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.eraseToAnyPublisher()
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}
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.subscribe(on: Threading.pollerQueue)
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.handleEvents(
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receiveOutput: { [weak self] failureCount, response in
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guard !calledFromBackgroundPoller || isBackgroundPollerValid() else {
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// If this was a background poll and the background poll is no longer valid
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// then just stop
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self?.isPolling = false
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return
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}
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self?.isPolling = false
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self?.handlePollResponse(
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response,
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failureCount: failureCount,
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using: dependencies
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)
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dependencies.mutableCache.mutate { cache in
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cache.hasPerformedInitialPoll[server] = true
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cache.timeSinceLastPoll[server] = Date().timeIntervalSince1970
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UserDefaults.standard[.lastOpen] = Date()
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}
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SNLog("Open group polling finished for \(server).")
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}
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)
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.map { _ in () }
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.catch { [weak self] error -> AnyPublisher<Void, Error> in
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guard
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let strongSelf = self,
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(!calledFromBackgroundPoller || isBackgroundPollerValid())
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else {
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// If this was a background poll and the background poll is no longer valid
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// then just stop
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self?.isPolling = false
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return Just(())
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.setFailureType(to: Error.self)
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.eraseToAnyPublisher()
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}
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// If we are retrying then the error is being handled so no need to continue (this
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// method will always resolve)
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return strongSelf
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.updateCapabilitiesAndRetryIfNeeded(
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server: server,
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calledFromBackgroundPoller: calledFromBackgroundPoller,
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isBackgroundPollerValid: isBackgroundPollerValid,
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isPostCapabilitiesRetry: isPostCapabilitiesRetry,
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error: error
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)
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.handleEvents(
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receiveOutput: { [weak self] didHandleError in
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if !didHandleError && isBackgroundPollerValid() {
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// Increase the failure count
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let pollFailureCount: Int64 = Storage.shared
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.read { db in
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try OpenGroup
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.filter(OpenGroup.Columns.server == server)
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.select(max(OpenGroup.Columns.pollFailureCount))
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.asRequest(of: Int64.self)
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.fetchOne(db)
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}
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.defaulting(to: 0)
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Storage.shared.writeAsync { db in
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try OpenGroup
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.filter(OpenGroup.Columns.server == server)
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.updateAll(
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db,
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OpenGroup.Columns.pollFailureCount.set(to: (pollFailureCount + 1))
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)
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}
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SNLog("Open group polling failed due to error: \(error). Setting failure count to \(pollFailureCount).")
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}
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self?.isPolling = false
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}
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)
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.map { _ in () }
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.eraseToAnyPublisher()
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}
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.eraseToAnyPublisher()
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}
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private func updateCapabilitiesAndRetryIfNeeded(
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server: String,
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calledFromBackgroundPoller: Bool,
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isBackgroundPollerValid: @escaping (() -> Bool) = { true },
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isPostCapabilitiesRetry: Bool,
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error: Error,
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using dependencies: OpenGroupManager.OGMDependencies = OpenGroupManager.OGMDependencies()
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) -> AnyPublisher<Bool, Error> {
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/// We want to custom handle a '400' error code due to not having blinded auth as it likely means that we join the
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/// OpenGroup before blinding was enabled and need to update it's capabilities
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///
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/// **Note:** To prevent an infinite loop caused by a server-side bug we want to prevent this capabilities request from
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/// happening multiple times in a row
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guard
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!isPostCapabilitiesRetry,
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let error: OnionRequestAPIError = error as? OnionRequestAPIError,
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case .httpRequestFailedAtDestination(let statusCode, let data, _) = error,
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statusCode == 400,
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let dataString: String = String(data: data, encoding: .utf8),
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dataString.contains("Invalid authentication: this server requires the use of blinded ids")
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else {
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return Just(false)
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.setFailureType(to: Error.self)
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.eraseToAnyPublisher()
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}
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return dependencies.storage
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.readPublisherFlatMap { db in
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OpenGroupAPI.capabilities(
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db,
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server: server,
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forceBlinded: true,
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using: dependencies
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)
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}
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.subscribe(on: OpenGroupAPI.workQueue)
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.flatMap { [weak self] _, responseBody -> AnyPublisher<Void, Error> in
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guard let strongSelf = self, isBackgroundPollerValid() else {
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return Just(())
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.setFailureType(to: Error.self)
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.eraseToAnyPublisher()
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}
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// Handle the updated capabilities and re-trigger the poll
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strongSelf.isPolling = false
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dependencies.storage.write { db in
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OpenGroupManager.handleCapabilities(
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db,
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capabilities: responseBody,
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on: server
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)
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}
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// Regardless of the outcome we can just resolve this
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// immediately as it'll handle it's own response
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return strongSelf.poll(
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calledFromBackgroundPoller: calledFromBackgroundPoller,
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isBackgroundPollerValid: isBackgroundPollerValid,
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isPostCapabilitiesRetry: true,
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using: dependencies
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)
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.map { _ in () }
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.eraseToAnyPublisher()
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}
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.map { _ in true }
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.catch { error -> AnyPublisher<Bool, Error> in
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SNLog("Open group updating capabilities failed due to error: \(error).")
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return Just(true)
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.setFailureType(to: Error.self)
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.eraseToAnyPublisher()
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}
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.eraseToAnyPublisher()
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}
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private func handlePollResponse(
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_ response: PollResponse,
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failureCount: Int64,
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using dependencies: OpenGroupManager.OGMDependencies = OpenGroupManager.OGMDependencies()
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) {
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let server: String = self.server
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let validResponses: PollResponse = response
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.filter { endpoint, endpointResponse in
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switch endpoint {
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case .capabilities:
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guard (endpointResponse.data as? BatchSubResponse<Capabilities>)?.body != nil else {
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SNLog("Open group polling failed due to invalid capability data.")
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return false
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}
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return true
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case .roomPollInfo(let roomToken, _):
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guard (endpointResponse.data as? BatchSubResponse<RoomPollInfo>)?.body != nil else {
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switch (endpointResponse.data as? BatchSubResponse<RoomPollInfo>)?.code {
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case 404: SNLog("Open group polling failed to retrieve info for unknown room '\(roomToken)'.")
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default: SNLog("Open group polling failed due to invalid room info data.")
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}
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return false
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}
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return true
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case .roomMessagesRecent(let roomToken), .roomMessagesBefore(let roomToken, _), .roomMessagesSince(let roomToken, _):
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guard
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let responseData: BatchSubResponse<[Failable<Message>]> = endpointResponse.data as? BatchSubResponse<[Failable<Message>]>,
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let responseBody: [Failable<Message>] = responseData.body
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else {
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switch (endpointResponse.data as? BatchSubResponse<[Failable<Message>]>)?.code {
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case 404: SNLog("Open group polling failed to retrieve messages for unknown room '\(roomToken)'.")
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default: SNLog("Open group polling failed due to invalid messages data.")
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}
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return false
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}
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let successfulMessages: [Message] = responseBody.compactMap { $0.value }
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if successfulMessages.count != responseBody.count {
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let droppedCount: Int = (responseBody.count - successfulMessages.count)
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SNLog("Dropped \(droppedCount) invalid open group message\(droppedCount == 1 ? "" : "s").")
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}
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return !successfulMessages.isEmpty
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case .inbox, .inboxSince, .outbox, .outboxSince:
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guard
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let responseData: BatchSubResponse<[DirectMessage]?> = endpointResponse.data as? BatchSubResponse<[DirectMessage]?>,
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!responseData.failedToParseBody
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else {
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SNLog("Open group polling failed due to invalid inbox/outbox data.")
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return false
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}
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// Double optional because the server can return a `304` with an empty body
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let messages: [OpenGroupAPI.DirectMessage] = ((responseData.body ?? []) ?? [])
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return !messages.isEmpty
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default: return false // No custom handling needed
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}
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}
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// If there are no remaining 'validResponses' and there hasn't been a failure then there is
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// no need to do anything else
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guard !validResponses.isEmpty || failureCount != 0 else { return }
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// Retrieve the current capability & group info to check if anything changed
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let rooms: [String] = validResponses
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.keys
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.compactMap { endpoint -> String? in
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switch endpoint {
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case .roomPollInfo(let roomToken, _): return roomToken
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default: return nil
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}
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}
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let currentInfo: (capabilities: Capabilities, groups: [OpenGroup])? = dependencies.storage.read { db in
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let allCapabilities: [Capability] = try Capability
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.filter(Capability.Columns.openGroupServer == server)
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.fetchAll(db)
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let capabilities: Capabilities = Capabilities(
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capabilities: allCapabilities
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.filter { !$0.isMissing }
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.map { $0.variant },
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missing: {
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let missingCapabilities: [Capability.Variant] = allCapabilities
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.filter { $0.isMissing }
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.map { $0.variant }
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return (missingCapabilities.isEmpty ? nil : missingCapabilities)
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}()
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)
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let openGroupIds: [String] = rooms
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.map { OpenGroup.idFor(roomToken: $0, server: server) }
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let groups: [OpenGroup] = try OpenGroup
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.filter(ids: openGroupIds)
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.fetchAll(db)
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return (capabilities, groups)
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}
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let changedResponses: PollResponse = validResponses
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.filter { endpoint, endpointResponse in
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switch endpoint {
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case .capabilities:
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guard
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let responseData: BatchSubResponse<Capabilities> = endpointResponse.data as? BatchSubResponse<Capabilities>,
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let responseBody: Capabilities = responseData.body
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else { return false }
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return (responseBody != currentInfo?.capabilities)
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case .roomPollInfo(let roomToken, _):
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guard
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let responseData: BatchSubResponse<RoomPollInfo> = endpointResponse.data as? BatchSubResponse<RoomPollInfo>,
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let responseBody: RoomPollInfo = responseData.body
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else { return false }
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guard let existingOpenGroup: OpenGroup = currentInfo?.groups.first(where: { $0.roomToken == roomToken }) else {
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return true
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}
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// Note: This might need to be updated in the future when we start tracking
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// user permissions if changes to permissions don't trigger a change to
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// the 'infoUpdates'
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return (
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responseBody.activeUsers != existingOpenGroup.userCount || (
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responseBody.details != nil &&
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responseBody.details?.infoUpdates != existingOpenGroup.infoUpdates
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)
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)
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default: return true
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}
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}
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// If there are no 'changedResponses' and there hasn't been a failure then there is
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// no need to do anything else
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guard !changedResponses.isEmpty || failureCount != 0 else { return }
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dependencies.storage.write { db in
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// Reset the failure count
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if failureCount > 0 {
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try OpenGroup
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.filter(OpenGroup.Columns.server == server)
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.updateAll(db, OpenGroup.Columns.pollFailureCount.set(to: 0))
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}
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try changedResponses.forEach { endpoint, endpointResponse in
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switch endpoint {
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case .capabilities:
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guard
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let responseData: BatchSubResponse<Capabilities> = endpointResponse.data as? BatchSubResponse<Capabilities>,
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let responseBody: Capabilities = responseData.body
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else { return }
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OpenGroupManager.handleCapabilities(
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db,
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capabilities: responseBody,
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on: server
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)
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case .roomPollInfo(let roomToken, _):
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guard
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let responseData: BatchSubResponse<RoomPollInfo> = endpointResponse.data as? BatchSubResponse<RoomPollInfo>,
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let responseBody: RoomPollInfo = responseData.body
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else { return }
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try OpenGroupManager.handlePollInfo(
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db,
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pollInfo: responseBody,
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publicKey: nil,
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for: roomToken,
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on: server,
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dependencies: dependencies
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)
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case .roomMessagesRecent(let roomToken), .roomMessagesBefore(let roomToken, _), .roomMessagesSince(let roomToken, _):
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guard
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let responseData: BatchSubResponse<[Failable<Message>]> = endpointResponse.data as? BatchSubResponse<[Failable<Message>]>,
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let responseBody: [Failable<Message>] = responseData.body
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else { return }
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OpenGroupManager.handleMessages(
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db,
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messages: responseBody.compactMap { $0.value },
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for: roomToken,
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on: server,
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dependencies: dependencies
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)
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case .inbox, .inboxSince, .outbox, .outboxSince:
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guard
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let responseData: BatchSubResponse<[DirectMessage]?> = endpointResponse.data as? BatchSubResponse<[DirectMessage]?>,
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!responseData.failedToParseBody
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else { return }
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// Double optional because the server can return a `304` with an empty body
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let messages: [OpenGroupAPI.DirectMessage] = ((responseData.body ?? []) ?? [])
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let fromOutbox: Bool = {
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switch endpoint {
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case .outbox, .outboxSince: return true
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default: return false
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}
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}()
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OpenGroupManager.handleDirectMessages(
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db,
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messages: messages,
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fromOutbox: fromOutbox,
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on: server,
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dependencies: dependencies
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)
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default: break // No custom handling needed
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}
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}
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}
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}
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}
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// MARK: - Convenience
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fileprivate static func getInterval(for failureCount: TimeInterval, minInterval: TimeInterval, maxInterval: TimeInterval) -> TimeInterval {
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// Arbitrary backoff factor...
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return min(maxInterval, minInterval + pow(2, failureCount))
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}
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}
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