Apollo GraphQL iOS：未发送查询函数

Question

我正在探索 GraphQL（这对我来说是新的）。我想进行经过身份验证的呼叫，但由于某种原因，它似乎没有发送：Proxyman 没有显示任何内容，并且我没有收到错误。

我遵循了官方教程并复制/改编了大部分代码。

相关代码：

public final class Network {

    public static let shared = Network()

    public static func authenticatedApollo(_ authenticationData: GraphQLAuthenticationData) -> ApolloClient {
        let client = URLSessionClient()
        let cache = InMemoryNormalizedCache()
        let store = ApolloStore(cache: cache)
        let provider = NetworkAuthenticatedInterceptorProvider(client: client, store: store, authenticationData: authenticationData)
        let url = URL(string: "my instance url")!
        let transport = RequestChainNetworkTransport(interceptorProvider: provider, endpointURL: url)

        return ApolloClient(networkTransport: transport, store: store)
    }
}

private class AuthorizationInterceptor: ApolloInterceptor {
    public var id: String

    private let authenticationData: GraphQLAuthenticationData

    init(id: String = UUID().uuidString, authenticationData: GraphQLAuthenticationData) {
        self.id = id
        self.authenticationData = authenticationData
    }

    func interceptAsync<Operation>(chain: RequestChain,
                                   request: HTTPRequest<Operation>,
                                   response: HTTPResponse<Operation>?,
                                   completion: @escaping (Result<GraphQLResult<Operation.Data>, Error>) -> Void)
    where Operation: GraphQLOperation {
        request.addHeader(name: "Authorization", value: authenticationData.token)
        // adding other headers
        chain.proceedAsync(request: request, response: response, interceptor: self, completion: completion)
    }
}

private class NetworkAuthenticatedInterceptorProvider: DefaultInterceptorProvider {

    private let authenticationData: GraphQLAuthenticationData

    init(client: URLSessionClient = URLSessionClient(), shouldInvalidateClientOnDeinit: Bool = true, store: ApolloStore, authenticationData: GraphQLAuthenticationData) {
        self.authenticationData = authenticationData
        super.init(client: client, shouldInvalidateClientOnDeinit: shouldInvalidateClientOnDeinit, store: store)
    }

    override func interceptors<Operation>(for operation: Operation) -> [ApolloInterceptor] where Operation: GraphQLOperation {
        var interceptors = super.interceptors(for: operation)
        let interceptor = AuthorizationInterceptor(authenticationData: authenticationData)
        interceptors.insert(interceptor, at: 0)
        return interceptors
    }
}

执行查询时，我没有收到成功或失败消息：

Network.authenticatedApollo(authenticationData).fetch(query: DemoAuthenticatedCallQuery(), cachePolicy: .fetchIgnoringCacheData) {result in
    switch result {
    case .success(let data):
        print("🛸 authenticated data: <...>)")
    case .failure(let error):
        print("🛸 authenticated error: \(error.localizedDescription)")
    }
}

但是如果我添加断点，我会看到我的拦截器被添加到 NetworkChain 列表中。我还验证了代码生成似乎运行良好。

欢迎任何相关提示！

Answer 1

我想通了。上述方法的问题是内存管理之一......

仅从函数返回

ApolloClient

不足以充分保留客户端，它会在发送请求之前超出范围。需要明确的是，我的示例中 Apollo 客户端的范围是进行调用的函数。

在结构中创建属性（如

private var apollo: ApolloClient?

）可以纠正此问题，并且客户端在请求的整个持续时间内保留在内存中。

希望这对某人有帮助。