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SwiftRex Reachability Middleware to keep track on network's availability
.package(url: "https://github.com/SwiftRex/ReachabilityMiddleware.git", from: "v0.1.4")



Control the Middleware: Dispatch these actions to the Store in order to start or stop the middleware:

ReachabilityEvent.startMonitoring      // Start the NWPathMonitor and the Middleware actions
ReachabilityEvent.stopMonitoring       // Stop the NWPathMonitor and cease the actions

Middleware events: these actions will be triggered by the middleware whenever NWPath is notified and differs from current state:

  • Related to the network interface
ReachabilityEvent.connectedToWifi      // The connection is now routed through the wi-fi
ReachabilityEvent.connectedToWired     // The connection is now routed through the wired ethernet
ReachabilityEvent.connectedToCellular  // The connection is now routed through the cellular network
ReachabilityEvent.gotOffline           // The connection was lost and device seems to be offline
  • Related to the network cost
ReachabilityEvent.becameExpensive      // The path uses an interface that is considered expensive, such as Cellular or a Personal Hotspot.
ReachabilityEvent.becameCheap          // The path uses an interface that is considered cheap, such as home Wi-fi or Ethernet.
ReachabilityEvent.becameConstrained    // The path uses an interface in Low Data Mode.
ReachabilityEvent.becameUnconstrained  // The path uses an interface in High Data Mode.


public struct ReachabilityState: Equatable, Codable {
    public let isMonitoring: Bool                // The Middleware is active, so the NWPathMonitor is observing changes
    public let connectivity: ConnectedInterface  // What's the latest known interface used to connect, or if it's disconnected
    public let isExpensive: Bool                 // The path uses an interface that is considered expensive or not
    public let isConstrained: Bool               // The path uses an interface in Low (constrained) or High (unconstrained) Data Mode.

public enum ConnectedInterface: String, Equatable, Codable {
    case cellular   // cellular (3G, LTE, 5G networks)
    case wifi       // Wi-fi, including Personal Hotpots
    case wired      // Wired Ethernet
    case none       // Disconnected

Combine Publisher

NWPathMonitorPublisher: Publisher for NWPathMonitor, emitting NWPath for every pathUpdateHandler event. It never fails. Important: it doesn't respect the demand, it's used only in this middleware that asks for unlimited demand, any use in other contexts should consider that the back-pressure will be ignored, with the exception of the first demand different than .none which will kickstart the side-effect, but regardless of how much the demand is sent by the subscriber, the publisher will make it unlimited.

let cancellable = NWPathMonitor().publisher.sink { path in 
    let isEthernet = path.usesInterfaceType(.wiredEthernet)
    // ...

Effect Middleware

This effect middleware has dependency on ReachabilityMiddlewareDependencies, which simply wraps a constructor for a NWPathMonitorPublisher.

Some examples of how this dependency should be created:

let dep1 = ReachabilityMiddlewareDependencies.production()
let dep2 = ReachabilityMiddlewareDependencies.production(requiredInterfaceType: .wifi)
let dep3 = ReachabilityMiddlewareDependencies.production(prohibitedInterfaceTypes: [.wifi])
let mock = PassthroughSubject<NWPath, Never>()
let dep4 = ReachabilityMiddlewareDependencies.forTests(subject: mock)
let dep5 = ReachabilityMiddlewareDependencies(pathMonitor: { publisherOfNWPath.eraseToAnyPublisher() })

Regardless of how you created it, you can inject it into the MiddlewareReader. Internally, the middleware will use dep1.pathMonitor().sink.

let middleware = EffectMiddleware<ReachabilityEvent, ReachabilityEvent, ReachabilityState, ReachabilityMiddlewareDependencies>

let store = ... // lift and use the middleware


The reducer will update your AppState according to the actions received by the middleware.

let reducer = Reducer<ReachabilityEvent, ReachabilityState>.reachability

let store = ... // lift and use the reducer


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Last commit: 6 days ago

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iOS Software Engineer @ Perry Street Software
Perry Street Software is Jack’d and SCRUFF. We are two of the world’s largest gay, bi, trans and queer social dating apps on iOS and Android. Our brands reach more than 20 million members worldwide so members can connect, meet and express themselves on a platform that prioritizes privacy and security. We invest heavily into SwiftUI and using Swift Packages to modularize the codebase.


Release Notes

Update SwiftRex to 0.8.4
6 days ago

Swiftpack is being maintained by Petr Pavlik | @ptrpavlik | @swiftpackco | API