Swift3 ZeroMQ消息编译器的快速方便初始化器

我在Docker容器中使用Swift 3和ZeroMQ，我想通过扩展向ZeroMQ.Message添加几个方便的初始化器。我目前遇到的问题是使编译器崩溃：

import Foundation
import ZeroMQ
import SwiftProtobuf

extension ZeroMQ.Message {
    convenience init?(string: String, encoding: String.Encoding = .utf8) {
        var asData = string.data(using:encoding)!

        asData.withUnsafeBytes { (bytes: UnsafePointer<UInt8>) in
            let unsafe = UnsafeMutableRawPointer.allocate(bytes: asData.count, alignedTo: 8)
            unsafe.copyBytes(from: bytes, count: asData.count)
            try? self.init(data: unsafe, size: asData.count)
        }
    }

    convenience init?(protobuf: SwiftProtobuf.Message) {
        guard let data = try? protobuf.serializedData() else {
            return nil
        }

        data.withUnsafeBytes { (bytes: UnsafePointer<UInt8>) in
            let unsafe = UnsafeMutableRawPointer.allocate(bytes: data.count, alignedTo: 8)
            unsafe.copyBytes(from: bytes, count: data.count)
            try? self.init(data: unsafe, size: data.count)
        }
    }
}

上述情况产生了一个我不理解的错误：

extensions.swift:41:17: error: 'self' used inside 'catch' block reachable from self.init call
    convenience init?(string: String, encoding: String.Encoding = .utf8) {

将

do{…}catch{…}

替换为一行程序可以满足编译器的要求，但在初始化器抛出时会泄漏缓冲区（在成功的情况下，ZeroMQ会获得内存的所有权）：

---

事实证明，我对ZeroMQ API不熟悉，这意味着我走错了路，不必要地把事情复杂化了。ZeroMQ已经有一个方法封装

UnsafemtableBytes

特性：

public func send(_ data: Data, mode: SendMode = []) throws -> Bool

。。。因此，为了实现增加发送Protobufs的便利性的目标，我所需要做的就是向ZeroMQ的

套接字

添加一个简单的扩展方法：

extension Socket {
    func send(_ proto: SwiftProtobuf.Message, mode: SendMode = []) throws -> Bool {
        let data = try proto.serializedData()
        return try self.send(data, mode: mode)
    }
}

try? self.init(data: unsafe, size: data.count)

public func send(_ data: Data, mode: SendMode = []) throws -> Bool

extension Socket {
    func send(_ proto: SwiftProtobuf.Message, mode: SendMode = []) throws -> Bool {
        let data = try proto.serializedData()
        return try self.send(data, mode: mode)
    }
}