From 642b627d277cdb30b91682ba29b5c3a226d607d9 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Thu, 13 Dec 2018 15:26:04 +0100
Subject: Rewrite Logger

This reverts all of Roop's changes to the C code, and then rewrites the
logger logic to be cleaner.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
 WireGuard/Shared/Logging/Logger.swift | 88 +++++++++++++++++------------------
 1 file changed, 44 insertions(+), 44 deletions(-)

(limited to 'WireGuard/Shared/Logging/Logger.swift')

diff --git a/WireGuard/Shared/Logging/Logger.swift b/WireGuard/Shared/Logging/Logger.swift
index 7df162a..f8ef70a 100644
--- a/WireGuard/Shared/Logging/Logger.swift
+++ b/WireGuard/Shared/Logging/Logger.swift
@@ -4,65 +4,65 @@
 import Foundation
 import os.log
 
-class Logger {
-    static var logPtr: UnsafeMutablePointer<log>?
+public class Logger {
+    static var global: Logger?
 
-    static func configure(withFilePath filePath: String) -> Bool {
-        let logPtr = filePath.withCString { filePathCStr -> UnsafeMutablePointer<log>? in
-            return open_log(filePathCStr)
+    var log: OpaquePointer?
+    var tag: String
+
+    init(withFilePath filePath: String, withTag tag: String) {
+        self.tag = tag
+        self.log = filePath.withCString { fileC -> OpaquePointer? in
+            open_log(fileC)
+        }
+        if self.log == nil {
+            os_log("Cannot open log file for writing. Log will not be saved to file.", log: OSLog.default, type: .error)
         }
-        Logger.logPtr = logPtr
-        return (logPtr != nil)
     }
 
-    static func writeLog(mergedWith otherLogFile: String, tag: String, otherTag: String, to targetFile: String) -> Bool {
-        let otherlogPtr = otherLogFile.withCString { otherLogFileCStr -> UnsafeMutablePointer<log>? in
-            return open_log(otherLogFileCStr)
+    func log(message: String) {
+        guard let log = log else { return }
+        String(format: "[%@] %@", tag, message.trimmingCharacters(in: .newlines)).withCString { messageC in
+            write_msg_to_log(log, messageC)
         }
-        if let thisLogPtr = Logger.logPtr, let otherlogPtr = otherlogPtr {
-            return targetFile.withCString { targetFileCStr -> Bool in
-                return tag.withCString { tagCStr -> Bool in
-                    return otherTag.withCString { otherTagCStr -> Bool in
-                        let returnValue = write_logs_to_file(targetFileCStr, tagCStr, thisLogPtr, otherTagCStr, otherlogPtr)
-                        return (returnValue == 0)
-                    }
-                }
-            }
+    }
+
+    func writeLog(mergedWith otherLogFile: String, to targetFile: String) -> Bool {
+        guard let log = log else { return false }
+        guard let other = otherLogFile.withCString({ otherC -> OpaquePointer? in
+            return open_log(otherC)
+        }) else { return false }
+        defer { close_log(other) }
+        return targetFile.withCString { fileC -> Bool in
+            return write_logs_to_file(fileC, log, other) == 0
         }
-        return false
     }
-}
 
-func wg_log_versions_to_file() {
-    var appVersion = Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String ?? "Unknown version"
-    if let appBuild = Bundle.main.infoDictionary?["CFBundleVersion"] as? String {
-        appVersion += " (\(appBuild))"
+    static func configureGlobal(withFilePath filePath: String?, withTag tag: String) {
+        if Logger.global != nil {
+            return
+        }
+        guard let filePath = filePath else {
+            os_log("Unable to determine log destination path. Log will not be saved to file.", log: OSLog.default, type: .error)
+            return
+        }
+        Logger.global = Logger(withFilePath: filePath, withTag: tag)
+        var appVersion = Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String ?? "Unknown version"
+        if let appBuild = Bundle.main.infoDictionary?["CFBundleVersion"] as? String {
+            appVersion += " (\(appBuild))"
+        }
+        let goBackendVersion = WIREGUARD_GO_VERSION
+        Logger.global?.log(message: "App version: \(appVersion); Go backend version: \(goBackendVersion)")
+
     }
-    let goBackendVersion = WIREGUARD_GO_VERSION
-    file_log(message: "App version: \(appVersion); Go backend version: \(goBackendVersion)")
 }
 
 func wg_log(_ type: OSLogType, staticMessage msg: StaticString) {
-    // Write to os log
     os_log(msg, log: OSLog.default, type: type)
-    // Write to file log
-    let msgString: String = msg.withUTF8Buffer { (ptr: UnsafeBufferPointer<UInt8>) -> String in
-        return String(decoding: ptr, as: UTF8.self)
-    }
-    file_log(message: msgString)
+    Logger.global?.log(message: "\(msg)")
 }
 
 func wg_log(_ type: OSLogType, message msg: String) {
-    // Write to os log
     os_log("%{public}s", log: OSLog.default, type: type, msg)
-    // Write to file log
-    file_log(message: msg)
-}
-
-private func file_log(message: String) {
-    message.withCString { messageCStr in
-        if let logPtr = Logger.logPtr {
-            write_msg_to_log(logPtr, messageCStr)
-        }
-    }
+    Logger.global?.log(message: msg)
 }
-- 
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