Droplet 是一个比较综合的类，它负责路由的注册、服务的启动和中间件的添加等等。

初始化

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编辑 main.swift

import Vapor

let drop = Droplet()

drop.serve()

使用默认参数配置的 Droplet 就被构造出来了。

同时，也可以自定义构造 Droplet

public init(
        // non-providable
        arguments: [String]? = nil,
        workDir workDirProvided: String? = nil,
        config configProvided: Config? = nil,
        localization localizationProvided: Localization? = nil,

        // providable
        server: ServerProtocol.Type? = nil,
        sessions: Sessions? = nil,
        hash: Hash? = nil,
        console: ConsoleProtocol? = nil,
        log: Log? = nil,
        client: ClientProtocol.Type? = nil,
        database: Database? = nil,

        // database preparations
        preparations: [Preparation.Type] = [],

        // providers
        providers providerTypes: [Provider.Type] = [],
        initializedProviders: [Provider] = []
    )

环境

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定义

Environment 是一个枚举类型，具体定义如下

/**
    Represents the current environment the
    droplet is running in. This information
    can be used to conditionally show debug or testing information.
*/
public enum Environment: Equatable {
    case production
    case test
    case development
    case custom(String)

    init(id string: String) {
        switch string.lowercased() {
        case "production", "prod":
            self = .production
        case "test":
            self = .test
        case "development", "dev":
            self = .development
        default:
            self = .custom(string)
        }
    }
}

分为 production 、 test 、development 和 custom 环境类型。

使用

let env = drop.config.environment
if .production == env {
    print("environment = production")
} else if .test == env {
    print("environment = test")
} else if .development == env {
    print("environment = development")
} else {
    print("environment = \(env)")
}

可通过执行如下命令来指定当前环境类型

• production

vapor run serve --env=production

或

vapor run serve --env=prod

输出

environment = production

• test

vapor run serve --env=test

输出

environment = test

• development

vapor run serve --env=development

或

vapor run serve --env=dev

输出

environment = development

• ** custom**

vapor run serve --env=myenv

输出

environment = myenv

其中， myenv 也可以是其它任意字符串。

注意：

1. 如果未明确指定环境的话，默认将以 development 环境执行。
2. production 环境下可以过滤 Debug 日志以提高性能，建议最终部署的时候选择 production 环境。

工作目录

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可通过 drop.workDir 获取当前工作目录。

print("workDir = \(drop.workDir)")

输出

workDir = /Users/Cary/Documents/Swift/Vapor/Project/vapor_test/

注意： 输出的路径由执行时所在路径决定。

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