vapor smtp发送邮件provider

最经几天一直在拜读Vapor中service的源码，连续几天上班途中和下班之后都是在翻看源码，从刚开始感觉云山雾绕到逐渐清晰

server内部介绍

而最终内部的所有被注册的server都会通过下面来进行实例化注册到系统中来使用

被注册service最终实例化

看了这么久我们根据最新发送邮件的需求自己写个service，在此我们通过Provider来实现IBM swift SMTP
在此我们分为SKSmtpProvider和SKSmtpConfig两部分，其中SKSmtpConfig为SMTP的信息配置项而SKSmtpProvider为真实的Server实现部分
先上Provider的代码

class SKSmtpProvider: Provider {
    func register(_ services: inout Services) throws {
        services.register { (container) -> SKSmtp in
            let config = try container.make(SKSmtpConfig.self)
           assert(config != nil, "选注册SKSmtpConfig实例，才能使用SKSmtp")
            return SKSmtp.init(config: config)
        }
    }
    func didBoot(_ container: Container) throws -> EventLoopFuture<Void> {
        let result = container.eventLoop.newPromise(Void.self)
        result.succeed()
        return result.futureResult
    }
}

对于使用Provider来实现service则必须实现Provider 协议

Provider官方注释
然后是我们SMTP的server实现,对于service协议，就只是一个类型声明:public protocol Service {}

class SKSmtp : Service {
   fileprivate var smtp: SMTP?
    init(config: SKSmtpConfig) {
        self.smtp = SMTP.init(hostname: config.hostname, email: config.email, password: config.password, port: config.port, useTLS: config.useTLS, tlsConfiguration: config.tlsConfiguration, authMethods:config.authMethods, domainName: config.domainName, timeout: config.timeout)
    }
    
    /// Send an email.
    ///
    /// - Parameters:
    ///     - mail: `Mail` object to send.
    ///     - completion: Callback when sending finishes. `Error` is nil on success. (optional)
    public func send(_ mail: Mail, completion: ((Error?) -> Void)? = nil) {
        smtp?.send(mail, completion: completion)
    }
    public func send(_ mails: [Mail],
                     progress: Progress = nil,
                     completion: Completion = nil) {
        smtp?.send(mails, progress: progress, completion: completion)
    }
}

最后是Config，很简单Config其实就是SMTP的配置信息

public struct SKSmtpConfig : Service{
    var hostname: String
    var email: String
    var password: String
    var port: Int32 = 465
    var useTLS: Bool = false
    var tlsConfiguration: SwiftSMTP.TLSConfiguration?
    var authMethods:[ AuthMethod] = []
    var domainName: String  = "localhost"
    var timeout: UInt = 10
    init(hostname: String, email: String, password: String, port: Int32 = 465, useTLS:Bool = false,tlsConfiguration:SwiftSMTP.TLSConfiguration? = nil, authMethods:[ AuthMethod] = [], domainName: String  = "localhost", timeout: UInt = 10) {
        self.hostname = hostname
        self.email = email
        self.password = password
        self.port = port
        self.useTLS = useTLS
        self.tlsConfiguration = tlsConfiguration
        self.domainName = domainName
        self.timeout = timeout
    }
}

所有的都已经实现了，接下来就是使用了
1 系统的configure中注册对应的Provider

let smtpConfig =  SKSmtpConfig.init(hostname: "", email: "", password: "")
    
    services.register(smtpConfig)
    try services.register(SKSmtpProvider())

2 在网络请求中实现

 public func regist(req: Request)throws-> EventLoopFuture<String>{
        
        let smtp: SKSmtp =  try req.make(SKSmtp.self)
        smtp.send(<#T##mail: Mail##Mail#>, completion: <#T##((Error?) -> Void)?##((Error?) -> Void)?##(Error?) -> Void#>)

Vapor集成使用

.package(url: "https://github.com/skeyboy/SKSmtp.git", from:"0.0.1")