Add logging and configuration file

Resources/paths.conf

@@ -0,0 +1,3 @@
+/data/logs/festival/server.log
+/data/public/festival/lists
+

Sources/App/Errors.swift

@@ -0,0 +1,6 @@
+import Foundation
+
+enum FestivalError: Error {
+
+    case invalidConfiguration
+}

Sources/App/Log.swift

@@ -0,0 +1,43 @@
+import Foundation
+
+private let df: DateFormatter = {
+    let df = DateFormatter()
+    df.dateStyle = .short
+    df.timeStyle = .short
+    df.locale = Locale(identifier: "de")
+    return df
+}()
+
+func log(_ message: String, file: String = #file, line: Int = #line) {
+    let date = df.string(from: Date())
+    let m = "[\(date)][\(file.components(separatedBy: "/").last ?? file):\(line)] \(message)"
+    print(m)
+    Log.write(m + "\n")
+}
+
+enum Log {
+
+    static func set(logFile: String) throws {
+        let url = URL(fileURLWithPath: logFile)
+        let date = df.string(from: Date())
+        if !FileManager.default.fileExists(atPath: logFile) {
+            try "[\(date)] New log created.\n".write(to: url, atomically: false, encoding: .utf8)
+        }
+        guard let f = FileHandle(forWritingAtPath: logFile) else {
+            try "[\(date)] Failed to start log.\n".write(to: url, atomically: false, encoding: .utf8)
+            return
+        }
+        f.seekToEndOfFile()
+        f.write("[\(date)] Logging started.\n".data(using: .utf8)!)
+        file = f
+    }
+
+    static func write(_ message: String) {
+        guard let f = file else {
+            return
+        }
+        f.write(message.data(using: .utf8)!)
+    }
+
+    private static var file: FileHandle?
+}

Sources/App/configure.swift

@@ -38,14 +38,14 @@ private func saveLists() {
 
 private func saveList(_ set: Set<String>, named name: String, to url: URL) {
     guard let list = set.sorted().joined(separator: "\n").data(using: .utf8) else {
-        print("Failed to save \(name) list, no data")
+        log("Failed to save \(name) list, no data")
         return
     }
     do {
         try list.write(to: url)
-        print("Saved \(name) list with \(set.count) entries")
+        log("Saved \(name) list with \(set.count) entries")
     } catch {
-        print("Failed to write \(name) list: \(error)")
+        log("Failed to write \(name) list: \(error)")
     }
 }
 
@@ -54,7 +54,7 @@ private func loadList(from url: URL) throws -> Set<String> {
         .split(separator: "\n")
         .map { $0.trimmingCharacters(in: .whitespacesAndNewlines) }
         .filter { !$0.isEmpty }
-    print("Loaded list \(url.path) (\(users.count) entries)")
+    log("Loaded list \(url.path) (\(users.count) entries)")
     return .init(users)
 }
 
@@ -93,25 +93,32 @@ public func configure(_ app: Application) throws {
     // uncomment to serve files from /Public folder
     // app.middleware.use(FileMiddleware(publicDirectory: app.directory.publicDirectory))
     app.http.server.configuration.port = 9001
-    
-    // let eventLog = app.directory.publicDirectory + "events.txt"
-    // let guestList = app.directory.publicDirectory + "registered.txt"
-    // let declinedList = app.directory.publicDirectory + "declined.txt"
-    let eventLog = "/blog/site/lists/events.txt"
-    let guestList = "/blog/site/lists/registered.txt"  
-    let declinedList = "/blog/site/lists/declined.txt"
 
-    let eventLogPath = URL(fileURLWithPath: eventLog)
-    guestListPath = URL(fileURLWithPath: guestList)
-    declinedListPath = URL(fileURLWithPath: declinedList)
+    let configFile = URL(fileURLWithPath: app.directory.resourcesDirectory)
+        .appendingPathComponent("paths.conf")
+    let configData = try String(contentsOf: configFile)
+        .components(separatedBy: "\n")
+        .map { $0.trimmingCharacters(in: .whitespaces) }
+        .filter { !$0.isEmpty }
+    guard configData.count == 2 else {
+        throw FestivalError.invalidConfiguration
+    }
+    let logFile = URL(fileURLWithPath: configData[0])
+    let listDirectory = URL(fileURLWithPath: configData[1])
+
+    try Log.set(logFile: logFile.path)
+
+    let eventLog = listDirectory.appendingPathComponent("events.txt")
+    guestListPath = listDirectory.appendingPathComponent("registered.txt")
+    declinedListPath = listDirectory.appendingPathComponent("declined.txt")
     
     // Create the files
-    try createFileIfNeeded(at: eventLogPath)
+    try createFileIfNeeded(at: eventLog)
     try createFileIfNeeded(at: guestListPath)
     try createFileIfNeeded(at: declinedListPath)
     
     // Create handle to write events
-    eventLogHandle = FileHandle(forWritingAtPath: eventLog)
+    eventLogHandle = try FileHandle(forWritingTo: eventLog)
     if #available(macOS 10.15.4, *) {
         try eventLogHandle?.seekToEnd()
     } else {
@@ -127,6 +134,6 @@ public func configure(_ app: Application) throws {
     
     let date = Date()
     let dateString = df.string(from: date)
-    print("[\(dateString)] Server started: \(registeredGuests.count) registered, \(declinedGuests.count) declined, event log open: \(eventLogHandle != nil)")
+    log("[\(dateString)] Server started: \(registeredGuests.count) registered, \(declinedGuests.count) declined, event log open: \(eventLogHandle != nil)")
 
 }