util: add structured logger

2023-08-02 17:07:55 -07:00
parent cdc4a7b7a4
commit b556257edd
2 changed files with 51 additions and 0 deletions
--- a/damus/Util/Log.swift
+++ b/damus/Util/Log.swift
@@ -0,0 +1,47 @@
+//
+//  Log.swift
+//  damus
+//
+//  Created by William Casarin on 2023-08-02.
+//
+
+import Foundation
+import os.log
+
+
+enum LogCategory: String {
+    case nav
+    case render
+}
+
+/// Damus structured logger
+class Log {
+    static private func logger(for logcat: LogCategory) -> OSLog {
+        return OSLog(subsystem: "com.jb55.damus", category: logcat.rawValue)
+    }
+
+    /// dumb workaround, swift can't forward C vararsg
+    static private func log(_ message: StaticString, for log: OSLog, type: OSLogType, _ args: [CVarArg]) {
+        switch args.count {
+            case 0:
+                os_log(message, log: log, type: type)
+            case 1:
+                os_log(message, log: log, type: type, args[0])
+            case 2:
+                os_log(message, log: log, type: type, args[0], args[1])
+            case 3:
+                os_log(message, log: log, type: type, args[0], args[1], args[2])
+            case 4:
+                os_log(message, log: log, type: type, args[0], args[1], args[2], args[3])
+            case 5:
+                os_log(message, log: log, type: type, args[0], args[1], args[2], args[3], args[4])
+            default:
+                os_log("Too many variadic params were sent to the logger so we tossed them!", log: log, type: .error)
+                os_log(message, log: log, type: type)
+        }
+    }
+
+    static func info(_ msg: StaticString, for logcat: LogCategory, _ args: CVarArg...) {
+        Log.log(msg, for: logger(for: logcat), type: OSLogType.info, args)
+    }
+}