Unified swift logging.

redactable.swift

import os.log
import Foundation

@propertyWrapper
struct Redactable<Value: Codable & Hashable>: Codable, Hashable, CustomLeafReflectable,
                                              CustomStringConvertible, CustomDebugStringConvertible, CustomPlaygroundDisplayConvertible {
    
    private let value: Value
    var isRedactionEnabled = true
    
    var projectedValue: Self {
        get {
            return self
        } set {}
    }
    
    var wrappedValue: Value {
        get {
            return value
        } set {}
    }
    
    var playgroundDescription: Any {
        return "<redacted>"
    }               
           
    var description: String {
        return isRedactionEnabled ? "<redacted>" : String(describing: value)
    }
                                         
    var debugDescription: String {
        return isRedactionEnabled ? "<redacted>" : String(describing: value)
    }
    
    var customMirror: Mirror {
        return isRedactionEnabled ? Mirror(reflecting: "<redacted>") : Mirror(reflecting: value)
    }
    
    init(wrappedValue: Value) {
        self.value = wrappedValue
    }
}

/* Usage */

struct Person: Codable, Hashable {
  
    let name: String
    
    @Redactable
    private(set) var creditCardNumber: String
}

let person = Person(name: "Manas", creditCardNumber: "1234-1234-1255-2114")

print(person) // prints Person(name: "Manas", _creditCardNumber: <redacted>)
print(person.$creditCardNumber) // prints <redacted>

dump(person) 

/*
prints
Person
  - name: "Manas"
  - _creditCardNumber: <redacted>
*/

debugPrint(person) // prints Person(name: "Manas", _creditCardNumber: <redacted>)

os_log("%@", String(describing: person)) // prints Person(name: "Manas", _creditCardNumber: <redacted>)

/*
 * If you print print(person.creditCardNumber), the string will not be redacted. 
*/