Use json database

Sources/App/Cap.swift

@@ -0,0 +1,30 @@
+import Foundation
+
+struct Cap: Codable {
+
+    let id: Int
+
+    var name: String
+
+    var count: Int
+
+    var mainImage: Int
+
+    /// The version of the first classifier trained on this cap
+    var classifierVersion: Int
+
+    enum CodingKeys: String, CodingKey {
+        case id = "i"
+        case name = "n"
+        case count = "c"
+        case mainImage = "m"
+        case classifierVersion = "v"
+    }
+}
+
+extension Cap: Comparable {
+    
+    static func < (lhs: Cap, rhs: Cap) -> Bool {
+        lhs.id < rhs.id
+    }
+}

Sources/App/CapServer.swift

@@ -7,39 +7,55 @@ final class CapServer {
     
     private let imageFolder: URL
 
-    private let nameFile: URL
+    /// The file where the database of caps is stored
-
+    private let dbFile: URL
-    private let tempImageFile: URL
     
     private let fm = FileManager.default
     
     // MARK: Caps
 
-    private var caps = [String]()
+    private var saveImmediatelly = true
 
-    init(in folder: URL) throws {
+    private var caps = [Int: Cap]() {
-        self.imageFolder = folder.appendingPathComponent("images")
+        didSet {
-        self.nameFile = folder.appendingPathComponent("names.txt")
+            guard saveImmediatelly else {
-        self.tempImageFile = folder.appendingPathComponent("temp.jpg")
+                return
-        
+            }
-        var isDirectory: ObjCBool = false
+            try? saveCaps()
-        guard fm.fileExists(atPath: folder.path, isDirectory: &isDirectory),
-        isDirectory.boolValue else {
-            log("Public directory \(folder.path) is not a folder, or doesn't exist")
-            throw CapError.invalidConfiguration
         }
     }
 
-    // MARK: SQLite
+    var nextClassifierVersion: Int {
+        caps.values.map { $0.classifierVersion }.max() ?? 1
+    }
     
-    func loadCapNames() throws {
+    init(in folder: URL) throws {
-        let s = try String(contentsOf: nameFile)
+        self.imageFolder = folder.appendingPathComponent("images")
-        caps = s
+        self.dbFile = folder.appendingPathComponent("caps.json")
-            .trimmingCharacters(in: .whitespacesAndNewlines)
+        
-            .components(separatedBy: "\n")
+        var isDirectory: ObjCBool = false
+        guard fm.fileExists(atPath: folder.path, isDirectory: &isDirectory),
+              isDirectory.boolValue else {
+            log("Public directory \(folder.path) is not a folder, or doesn't exist")
+            throw CapError.invalidConfiguration
+        }
+
+        try loadCaps()
+        try updateCounts()
+    }
+
+    private func loadCaps() throws {
+        let data = try Data(contentsOf: dbFile)
+        caps = try JSONDecoder().decode([Cap].self, from: data)
+            .reduce(into: [:]) { $0[$1.id] = $1 }
         log("\(caps.count) caps loaded")
     }
 
+    private func saveCaps() throws {
+        let data = try JSONEncoder().encode(caps.values.sorted())
+        try data.write(to: dbFile)
+    }
+
     // MARK: Paths
 
     func folder(of cap: Int) -> URL {
@@ -52,10 +68,25 @@ final class CapServer {
     
     // MARK: Counts
 
-    func countImages(in folder: URL) throws -> Int {
+    private func updateCounts() throws {
-        try fm.contentsOfDirectory(at: folder, includingPropertiesForKeys: nil).filter({ $0.pathExtension == "jpg" }).count
+        saveImmediatelly = false
+        caps = try caps.mapValues {
+            var cap = $0
+            cap.count = try count(of: $0.id)
+            return cap
+        }
+        saveImmediatelly = true
+        try? saveCaps()
     }
 
+    func countImages(in folder: URL) throws -> Int {
+        try fm.contentsOfDirectory(at: folder, includingPropertiesForKeys: nil)
+            .filter({ $0.pathExtension == "jpg" }).count
+    }
+
+    /**
+     Get the image count of a cap.
+     */
     func count(of cap: Int) throws -> Int {
         let f = folder(of: cap)
         guard fm.fileExists(atPath: f.path) else {
@@ -66,40 +97,19 @@ final class CapServer {
     
     // MARK: Names
 
-    func name(for cap: Int) throws -> Data {
+    func set(name: String, for capId: Int) throws {
-        let index = cap - 1
+        guard var cap = caps[capId] else {
-        guard index >= 0, index < caps.count else {
+            let url = server.folder(of: capId)
-            log("Trying to get name for invalid cap \(cap) (\(caps.count) caps loaded)")
-            throw CapError.unknownId
-        }
-        return caps[index].data(using: .utf8)!
-    }
-    
-    func set(name: String, for cap: Int) throws {
-        let index = cap - 1
-        guard index <= caps.count else {
-            log("Trying to set name for cap \(cap), but only \(caps.count) caps exist")
-            throw CapError.unknownId
-        }
-        
-        if index == caps.count {
-            caps.append(name)
-            // Create image folder
-            let url = server.folder(of: cap)
             if !fm.fileExists(atPath: url.path) {
                 try fm.createDirectory(at: url, withIntermediateDirectories: false)
             }
-            log("Added cap \(cap)")
+            caps[capId] = Cap(id: capId, name: name, count: 0, mainImage: 0, classifierVersion: nextClassifierVersion)
-        } else {
+            log("Added cap \(capId)")
-            caps[index] = name
+            return
-            log("Set name for cap \(cap)")
         }
-        try caps.joined(separator: "\n").data(using: .utf8)!.write(to: server.nameFile)
+        cap.name = name
-    }
+        caps[capId] = cap
-    
+        log("Set name for cap \(capId)")
-    func getCountData() throws -> Data {
-        #warning("Counts are encoded as UInt8, works only while count < 256")
-        return Data(try (1...caps.count).map({ UInt8(try server.count(of: $0)) }))
     }
 
     // MARK: Images
@@ -111,37 +121,32 @@ final class CapServer {
      - Parameter data: The image data
      - Parameter cap: The id of the cap.
      - Returns: The new image count for the cap
-     - Throws: `CapError.dataInconsistency` if an image already exists for the current count.
+     - Throws: `CapError.unknownId`, if the cap doesn't exist. `CapError.dataInconsistency` if an image already exists for the current count.
      */
     func save(image data: Data, for cap: Int) throws -> Int {
-        let c = try count(of: cap)
+        guard var count = caps[cap]?.count else {
-        let f = file(of: cap, version: c)
+            throw CapError.unknownId
-        guard !fm.fileExists(atPath: f.path) else {
+        }
-            log("Image \(c) for cap \(cap) already exists on disk")
+        var id = 0
-            throw CapError.dataInconsistency
+        var f = file(of: cap, version: id)
+        while fm.fileExists(atPath: f.path) {
+            id += 1
+            f = file(of: cap, version: id)
         }
         try data.write(to: f)
-        return c
+        count += 1
+        caps[cap]!.count = count
+        log("Added image \(id) for cap \(cap)")
+        return count
     }
     
     func switchMainImage(to version: Int, for cap: Int) throws {
-        guard version > 0 else {
-            log("Not switching cap \(cap) to image \(version)")
-            return
-        }
-        let file1 = file(of: cap, version: 0)
-        guard fm.fileExists(atPath: file1.path) else {
-            log("No image 0 for cap \(cap)")
-            throw CapError.invalidFile
-        }
         let file2 = file(of: cap, version: version)
         guard fm.fileExists(atPath: file2.path) else {
             log("No image \(version) for cap \(cap)")
             throw CapError.invalidFile
         }
-        try fm.moveItem(at: file1, to: tempImageFile)
+        caps[cap]?.mainImage = version
-        try fm.moveItem(at: file2, to: file1)
-        try fm.moveItem(at: tempImageFile, to: file2)
         log("Switched cap \(cap) to version \(version)")
     }
 }

Sources/App/configure.swift

@@ -31,7 +31,6 @@ public func configure(_ app: Application) throws {
     }
 
     server = try CapServer(in: URL(fileURLWithPath: publicDirectory))
-    try server.loadCapNames()
     
     // Register routes to the router
     try routes(app)

Sources/App/routes.swift

@@ -5,15 +5,6 @@ import Vapor
 /// [Learn More →](https://docs.vapor.codes/3.0/getting-started/structure/#routesswift)
 func routes(_ app: Application) throws {
     
-    // Get the name of a cap
-    app.getCatching("name", ":n") { request -> Data in
-        guard let cap = request.parameters.get("n", as: Int.self) else {
-            log("Invalid body data")
-            throw Abort(.badRequest)
-        }
-        return try server.name(for: cap)
-    }
-    
     // Set the name of a cap
     app.postCatching("name", ":n") { request in
         guard let cap = request.parameters.get("n", as: Int.self) else {
@@ -42,28 +33,13 @@ func routes(_ app: Application) throws {
         return "\(newCount)".data(using: .utf8)!
     }
     
-    // Get count of a cap
-    app.getCatching("count", ":c") { request -> Data in
-        guard let cap = request.parameters.get("c", as: Int.self) else {
-            log("Invalid parameter for cap")
-            throw Abort(.badRequest)
-        }
-        let c = try server.count(of: cap)
-        return "\(c)".data(using: .utf8)!
-    }
-    
-    // Get the count of all caps
-    app.getCatching("counts") { request -> Data in
-        try server.getCountData()
-    }
-    
     // Set a different version as the main image
     app.getCatching("switch", ":n", ":v") { request in
-        guard let cap = request.parameters.get("n", as: Int.self) else {
+        guard let cap = request.parameters.get("n", as: Int.self), cap >= 0 else {
             log("Invalid parameter for cap")
             throw Abort(.badRequest)
         }
-        guard let version = request.parameters.get("v", as: Int.self) else {
+        guard let version = request.parameters.get("v", as: Int.self), version >= 0 else {
             log("Invalid parameter for cap version")
             throw Abort(.badRequest)
         }