graphql - 如何使用apollo ios客户端实现graphql订阅

Question

我正在尝试使用 apollo ios 客户端实现 graphql 订阅。但由于缺乏文档示例而无法弄清楚。
阿波罗文档中给出的示例是:

let apollo: ApolloClient = {
  let configuration = URLSessionConfiguration.default
  // Add additional headers as needed
  configuration.httpAdditionalHeaders = ["Authorization": "Bearer <token>"] // Replace `<token>`

  let url = URL(string: "http://localhost:8080/graphql")!

  return ApolloClient(networkTransport: HTTPNetworkTransport(url: url, configuration: configuration))
}()

APOLLO IOS GUIDE: Creating a client

Answer 1

按照以下步骤在 apollo ios graphql 客户端中实现订阅。

使用 cocoa bean :

pod 'Apollo'

pod 'Apollo/WebSocket'

pod install

创建客户端以支持订阅和身份验证。在 AppDelegate.swift 中添加以下代码:

Websocket - 我们必须使用 WebSocketTransport和 URLRequest

身份验证 - 我们必须在连接参数中传递身份验证参数 connectingPayload到服务器。对于 http，我们将其传递到问题片段中提到的 header 中。

SplitNetworkTransport - 将两者结合起来 http和 websocket创建客户端。我们必须使用 httpNetworkTransport和 webSocketNetworkTransport

lazy var apollo: ApolloClient = {
    let authPayloads = [
        "Authorization": "Bearer "
    ]
    let configuration = URLSessionConfiguration.default
    configuration.httpAdditionalHeaders = authPayloads


let map: GraphQLMap = authPayloads 
let wsEndpointURL = URL(string: "ws://localhost:8080/subscriptions")!
let endpointURL = URL(string: "http://localhost:8080/api")!
let websocket = WebSocketTransport(request: URLRequest(url: wsEndpointURL), connectingPayload: map)
let splitNetworkTransport = SplitNetworkTransport(
    httpNetworkTransport: HTTPNetworkTransport(
        url: endpointURL,
        configuration: configuration
    ), 
    webSocketNetworkTransport: websocket
)
return ApolloClient(networkTransport: splitNetworkTransport)

}()