Drop-in replacement for Data ivars that gets stored efficiently in MySQL by Vapor 3.

BinaryData.swift

import Foundation
import Vapor
import FluentMySQL

final class BinaryData {
    private let data: Data
    
    init(data: Data) {
        self.data = data
    }
    
    enum CodingKeys: String, CodingKey {
        case data
    }
}

extension BinaryData: ReflectionDecodable {
    static func reflectDecoded() throws -> (BinaryData, BinaryData) {
        return (BinaryData(data: Data(bytes: [UInt8(1)])), BinaryData(data: Data(bytes: [UInt8(2)])))
    }
    
    static func reflectDecodedIsLeft(_ item: BinaryData) throws -> Bool {
        return item.data[0] == UInt8(1)
    }
}

extension BinaryData: MySQLDataConvertible {
    func convertToMySQLData() -> MySQLData {
        return MySQLData(data: data)
    }
    
    static func convertFromMySQLData(_ mysqlData: MySQLData) throws -> BinaryData {
        return BinaryData(data: mysqlData.data() ?? Data())
    }
}

extension BinaryData: Content {
    convenience init(from decoder: Decoder) throws {
        self.init(data: try decoder.singleValueContainer().decode(Data.self))
    }
    
    func encode(to encoder: Encoder) throws {
        var container = encoder.singleValueContainer()
        try container.encode(self.data)
    }
}