Basic Setup of Classes and First Load/ Store Methods

RippleChat/Body.swift

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+//
+//  Body.swift
+//  RippleChat
+//
+//  Created by Severin Memmishofer on 08.07.23.
+//
+
+import Foundation
+
+struct Body: Codable {
+    
+    let tag: String
+    let value: String
+    
+    init(tag: String, value: String) {
+        self.tag = tag
+        self.value = value
+    }
+}

RippleChat/Feed.swift

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+//
+//  Feed.swift
+//  RippleChat
+//
+//  Created by Severin Memmishofer on 08.07.23.
+//
+
+import Foundation
+
+struct Feed: Codable {
+    
+    let feed: [LogEntry]
+    
+}
+
+extension Feed {
+    
+    static let sampleData: [LogEntry] =
+    [
+        LogEntry(feedid: "BOB", sequenceNumber: 1, body: Body(tag: "nam", value: "Bob")),
+        LogEntry(feedid: "BOB", sequenceNumber: 2, body: Body(tag: "txt", value: "My first post!")),
+        LogEntry(feedid: "BOB", sequenceNumber: 3, body: Body(tag: "txt", value: "Welcome Alice"))
+    ]
+    
+}

RippleChat/FeedStore.swift

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+//
+//  FeedStore.swift
+//  RippleChat
+//
+//  Created by Severin Memmishofer on 08.07.23.
+//
+
+import SwiftUI
+
+@MainActor
+class FeedStore: ObservableObject {
+    
+    @Published var feed: [LogEntry] = []
+    
+    private static func fileURL() throws -> URL {
+        try FileManager.default.url(for: .documentDirectory,
+                                    in: .userDomainMask,
+                                    appropriateFor: nil,
+                                    create: false)
+        .appendingPathComponent("feed.data")
+    }
+    
+    func load() async throws {
+        let task = Task<[LogEntry], Error> {
+            let fileURL = try Self.fileURL()
+            guard let data = try? Data(contentsOf: fileURL) else {
+                return []
+            }
+            let logEntries = try JSONDecoder().decode([LogEntry].self, from: data)
+            return logEntries
+        }
+        let feed = try await task.value
+        self.feed = feed
+    }
+    
+    func save(feed: [LogEntry]) async throws {
+        let task = Task {
+            let data = try JSONEncoder().encode(feed)
+            let outfile = try Self.fileURL()
+            try data.write(to: outfile)
+        }
+        _ = try await task.value
+    }
+}

RippleChat/LogEntry.swift

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+//
+//  LogEntry.swift
+//  RippleChat
+//
+//  Created by Severin Memmishofer on 08.07.23.
+//
+
+import Foundation
+
+struct LogEntry: Codable {
+    
+    let feedid: String
+    let sequenceNumber: Int
+    let body: Body
+    
+    init(feedid: String, sequenceNumber: Int, body: Body) {
+        self.feedid = feedid
+        self.sequenceNumber = sequenceNumber
+        self.body = body
+    }
+    
+}