Extract APNS code to own type

Sources/App/APNSInterface.swift

@@ -0,0 +1,85 @@
+import Foundation
+import APNSwift
+import NIO
+import Crypto
+
+struct APNSInterface {
+    
+    private struct Payload: Codable {}
+
+    private var apnsConfiguration: APNSClientConfiguration!
+    private var apnsNotification: APNSAlertNotification<Payload>!
+    private let apnsEventGroup = MultiThreadedEventLoopGroup(numberOfThreads: System.coreCount)
+    private let apnsRequestEncoder = JSONEncoder()
+    private let apnsResponseDecoder = JSONDecoder()
+    
+    init?(_ config: ServerConfiguration) {
+        guard let key = load(keyAtPath: config.privateKeyFilePath) else {
+            return nil
+        }
+        let authentication = APNSClientConfiguration.AuthenticationMethod.jwt(
+            privateKey: key,
+            keyIdentifier: config.keyIdentifier,
+            teamIdentifier: config.teamIdentifier)
+
+
+        apnsConfiguration = APNSClientConfiguration(
+            authenticationMethod: authentication,
+            environment: .sandbox)
+        
+        let alert = APNSAlertNotificationContent(
+            title: .raw(config.messageTitle),
+            body: .raw(config.messageBody))
+
+        apnsNotification = APNSAlertNotification(
+            alert: alert,
+            expiration: .none,
+            priority: .immediately,
+            topic: config.topic,
+            payload: Payload(),
+            sound: .default)
+    }
+    
+    func sendPush(to tokens: Set<String>) async {
+        let client = APNSClient(
+            configuration: apnsConfiguration,
+            eventLoopGroupProvider: .shared(apnsEventGroup),
+            responseDecoder: apnsResponseDecoder,
+            requestEncoder: apnsRequestEncoder)
+        log(info: "Client created")
+        do {
+            for token in tokenStorage.tokens {
+                log(info: "Sending push to \(token.prefix(6))...")
+                try await client.sendAlertNotification(
+                    apnsNotification,
+                    deviceToken: token,
+                    deadline: .now() + .seconds(10))
+                log(info: "Sent push to \(token.prefix(6))...")
+            }
+        } catch let error as APNSError {
+            print(error)
+        } catch {
+            log(error: error.localizedDescription)
+        }
+        do {
+            log("Closing client")
+            try client.syncShutdown()
+        } catch {
+            log(error: error.localizedDescription)
+        }
+    }
+}
+
+private func load(keyAtPath path: String) -> P256.Signing.PrivateKey? {
+    do {
+        guard let key = try P256.Signing.PrivateKey.loadFrom(filePath: path) else {
+            print("Failed to read key \(path)")
+            return nil
+        }
+        return key
+    } catch {
+        print("Failed to load key \(error)")
+        return nil
+    }
+}
+

Sources/App/configure.swift

@@ -1,17 +1,7 @@
 import Vapor
 import SwiftyGPIO
-import APNSwift
-import NIO
-import Crypto
-
-private struct Payload: Codable {}
-
-private var apnsConfiguration: APNSClientConfiguration!
-private var apnsNotification: APNSAlertNotification<Payload>!
-private let apnsEventGroup = MultiThreadedEventLoopGroup(numberOfThreads: System.coreCount)
-private let apnsRequestEncoder = JSONEncoder()
-private let apnsResponseDecoder = JSONDecoder()
 
+var apns: APNSInterface?
 var tokenStorage: TokenStorage!
 
 // configures your application
@@ -33,7 +23,8 @@ public func configure(_ app: Application) throws {
     
     app.http.server.configuration.port = config.port
     
-    guard configureAPNS(config) else {
+    apns = .init(config)
+    guard apns != nil else {
         serverStatus = .failedToStart
         return
     }
@@ -53,47 +44,6 @@ private extension JSONDecoder {
     }
 }
 
-private func load(keyAtPath path: String) -> P256.Signing.PrivateKey? {
-    do {
-        guard let key = try P256.Signing.PrivateKey.loadFrom(filePath: path) else {
-            print("Failed to read key \(path)")
-            return nil
-        }
-        return key
-    } catch {
-        print("Failed to load key \(error)")
-        return nil
-    }
-}
-
-private func configureAPNS(_ config: ServerConfiguration) -> Bool {
-    guard let key = load(keyAtPath: config.privateKeyFilePath) else {
-        return false
-    }
-    let authentication = APNSClientConfiguration.AuthenticationMethod.jwt(
-        privateKey: key,
-        keyIdentifier: config.keyIdentifier,
-        teamIdentifier: config.teamIdentifier)
-
-
-    apnsConfiguration = APNSClientConfiguration(
-        authenticationMethod: authentication,
-        environment: .sandbox)
-    
-    let alert = APNSAlertNotificationContent(
-        title: .raw(config.messageTitle),
-        body: .raw(config.messageBody))
-
-    apnsNotification = APNSAlertNotification(
-        alert: alert,
-        expiration: .none,
-        priority: .immediately,
-        topic: config.topic,
-        payload: Payload(),
-        sound: .default)
-    return true
-}
-
 private func configureGPIO(_ config: ServerConfiguration) {
     let gpio = RaspberryGPIO(
         name: "GPIO\(config.buttonPin)",
@@ -116,31 +66,6 @@ private func sendPush() {
         return
     }
     Task(priority: .userInitiated) {
-        let client = APNSClient(
+        await apns?.sendPush(to: tokenStorage.tokens)
-            configuration: apnsConfiguration,
-            eventLoopGroupProvider: .shared(apnsEventGroup),
-            responseDecoder: apnsResponseDecoder,
-            requestEncoder: apnsRequestEncoder)
-        log(info: "Client created")
-        do {
-            for token in tokenStorage.tokens {
-                log(info: "Sending push to \(token.prefix(6))...")
-                try await client.sendAlertNotification(
-                    apnsNotification,
-                    deviceToken: token,
-                    deadline: .now() + .seconds(10))
-                log(info: "Sent push to \(token.prefix(6))...")
-            }
-        } catch let error as APNSError {
-            print(error)
-        } catch {
-            log(error: error.localizedDescription)
-        }
-        do {
-            log("Closing client")
-            try client.syncShutdown()
-        } catch {
-            log(error: error.localizedDescription)
-        }
     }
 }