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Provider

The Provider protocol creates a simple and predictable way for adding functionality and third party packages to your Vapor project.

Adding a Provider

Adding a provider to your application takes 2-3 steps.

Add Package

All of Vapor's providers end with the -provider syntax. You can see a list of available providers by searching on our GitHub.

To add the provider to your package, add it as a dependency in your Package.swift file.

let package = Package(
    name: "MyApp",
    dependencies: [
        .Package(url: "https://github.com/vapor/vapor.git", majorVersion: 2),
        .Package(url: "https://github.com/vapor/mysql-provider.git", majorVersion: 2)
    ]
)

Warning

Always run vapor update or vapor clean after editing your Package.swift file.

Import

Once the provider has been added, you can import it using import VaporFoo where Foo is the name of the provider.

Here is what importing the MySQL provider looks like:

import Vapor
import MySQLProvider

Add to Droplet

Every provider comes with a class named Provider. Add this class to your Droplet using the addProvider method.

let config = try Config()
try config.addProvider(MySQLProvider.Provider.self)

let drop = try Droplet(config)

// ...

drop.run()

Configuration

Some drivers may require a configuration file. For example, MySQLProvider requires a Config/mysql.json file like the following:

{
    "hostname": "localhost",
    "user": "root",
    "password": "",
    "database": "vapor"
}

You will receive an error during the Droplet's initialization if a configuration file is required.

Tip

Storing sensitive configuration files (ones that contain passwords) in the Config/secrets folder will prevent them from being tracked by git.

Manual

Some providers can be configured manually by using the Provider's init method. This method can be used instead of configuration files.

let mysqlProvider = VaporMySQL.Provider(host: "localhost", user: "root", password: "", database: "vapor")
try config.addProvider(mysqlProvider)

Create a Provider

Creating a provider is easy, you just need to create a package with a class Provider that conforms to Vapor.Provider.

Example

Here is what a provider for an example Foo package would look like. All the provider does is take a message, then print the message when the Droplet starts.

import Vapor

public final class Provider: Vapor.Provider {
    public let message: String

    public convenience init(config: Config) throws {
        guard let message = config["foo", "message"].string else {
            throw ConfigError.missing(key: ["message"], file: "foo", desiredType: String.self)
        }

        self.init(message: message)
    }

    public init(message: String) {
        self.message = message
    }

    public func boot(_ drop: Droplet) { }

    public func beforeRun(_ drop: Droplet) {
        drop.console.info(message)
    }
}

This provider wil require a Config/foo.json file that looks like:

{
    "message": "The message to output"
}

The provider can also be initialized manually with the init(message: String) init.