Network

A really simple and straightforward network framework to fetch resources from remote in a safe way. Purpose on showing my approach of fetching resources from remote.

How to use

With the help of Generic Type in Swift, we can reduce many typos to avoid some stupid bugs, so the first target of this framework focus on supporting Generic Type.

Network uses Phantom type to let developer to create network request declaration easier.

private extension Request where ResponseType == NetworkTests.Response {
    
    static func list() -> Self {
        return Request(endpoint: Endpoint(path: "/live"), method: .get)
    }        
}

Then the request with a specific endpoint has been declared, you can use it as blow:

URLSession.shared.fetch(Request.list()) { result in
    // handle the result of request
    // ... 
}

How to describe a network request with Endpoint, Environment, etc

Endpoint

Endpoint is a structure to describe path and params in url.

struct Endpoint {
        
    let path: String
    let params: [String : String?]?
    
    init(path: String, params: [String : String?]? = nil) {
        self.path = path
        self.params = params
    }
}

We can define some requests with corresponding Endpoints.

EnvironmentProtocol

Environment has a higher level of view on networking, it's a protocol so that let developer to define their own network environment.

protocol EnvironmentProtocol {
    
    var scheme: String { get }
    var host: String { get }
    var commonHeaders: [String : String] { get }
    var commonQueries: [URLQueryItem]? { get }
    var timeout: TimeInterval { get }
}

As above, you can create an environment for your remote requests.

struct MyEnvironment: EnvironmentProtocol {

    var scheme: String = "https"
    var host: String = "mynetwork.com"
    var commonHeaders: [String : String] = Dictionary()
    var commonQueries: [URLQueryItem]? = nil
    var timeout: TimeInterval = 30
}

Notice that, scheme has default value https, timeout has default value 30.

You can assign an instance which conforms to EnvironmentProtocol to URLSession.environment, once you configure the URLSession like this, the network requests will use this environment as default. If you would like to use different environments for every single request, you can pass the environment as the second argument when calling URLSession.shared.fetch(_:,on:).

Encoding and Decoding

Currently this framework supports json, you can specify it when creating Request.