如何使用Apollo iOS客户端实现graphql订阅 [英] How to implement graphql subscription using apollo ios client

问题描述

我正在尝试使用apollo ios客户端实现graphql订阅.但是由于缺乏文档示例，因此无法弄清楚.阿波罗文档中给出的示例是:

I am trying to implement graphql subscription using apollo ios client. But not able to figure it out as lack of documentation examples. Example given on apollo documentation is:

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指南:创建客户端

推荐答案

通过以下步骤在apollo ios graphql客户端中实现订阅.

Implement the subscription in apollo ios graphql client by following below steps.

1. 使用cocoapods:

1. Using cocoapods:

1. pod'Apollo'
2. pod'Apollo/WebSocket'
3. pod安装

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:

1. Websocket-我们必须使用 WebSocketTransport 和 URLRequest
2. 身份验证-我们必须将连接参数 connectingPayload 中的auth参数传递给服务器.对于http，我们正在问题片段中提到的标头中传递它.
3. SplitNetworkTransport -组合 http 和 websocket 来创建客户端.我们必须使用 httpNetworkTransport 和 webSocketNetworkTransport

1. Websocket - we have to use WebSocketTransport and URLRequest
2. Authentication - we have to pass auth parameters in connection params connectingPayload to server. And for http we are passing it in headers as mentioned in question snippet.
3. SplitNetworkTransport- To combine both http and websocket to create client. we have to use httpNetworkTransport and 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)

}()

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