0

2017 年 6 月Apollo Subscription Resolver Never Activates?の私からの投稿を含め、SO に関する多くの投稿が で検索されます。それ以来、私は何ヶ月もの間、サブスクリプションをうまく機能させてきました. しかし、それは Apollo 1.x でした。現在の Apollo 2.x では、同様の異常が発生しています。

古い SO の投稿では、この異常が解決されていないようです。過去数日間、それらすべてを調べて、ドキュメントや記事に記載されていることをすべて実行していることを確認しようとしましたが、まだ完全には機能していません.

完全を期すために、関連するすべてのコードを提供しています。

サーバーのセットアップ

import { createApolloServer } from "meteor/apollo";
import { makeExecutableSchema } from "graphql-tools";
import merge from "lodash/merge";
import cors from 'cors';

import GoalsSchema from "../../api/goals/Goal.graphql";
import GoalsResolvers from "../../api/goals/resolvers";
import ResolutionsSchema from "../../api/resolutions/Resolutions.graphql";
import ResolutionsResolvers from "../../api/resolutions/resolvers";
import UsersSchema from "../../api/users/User.graphql";
import UsersResolvers from "../../api/users/resolvers";
import { createServer } from 'http';
import { SubscriptionServer } from 'subscriptions-transport-ws';
import { execute, subscribe } from 'graphql';

const typeDefs = [GoalsSchema, ResolutionsSchema, UsersSchema];

//must change this line to get changes in .graphql files recognized. afdkk

const resolvers = merge(GoalsResolvers, ResolutionsResolvers, UsersResolvers);

const schema = makeExecutableSchema({
    typeDefs,
    resolvers
});

createApolloServer({ schema });

const WS_PORT = 3200;

// Create WebSocket listener server
// https://www.apollographql.com/docs/graphql-subscriptions/express.html
const websocketServer = createServer((request, response) => {
    response.writeHead(404);
    response.end();
});

// Bind it to port and start listening
websocketServer.listen(WS_PORT, () => console.log(
    `Websocket Server is now running on ws://localhost:${WS_PORT}`
));

const subscriptionServer = SubscriptionServer.create(
    {
        schema,
        execute,
        subscribe,
    },
    {
        server: websocketServer,
        path: '/subscriptions',
    },
);

クライアント設定

import React from "react";
import {Meteor} from "meteor/meteor";
import {render} from "react-dom";
import {ApolloProvider} from "react-apollo";
import {ApolloLink, from} from "apollo-link";
import {ApolloClient} from "apollo-client";
import {HttpLink} from "apollo-link-http";
import {InMemoryCache} from "apollo-cache-inmemory";
import {onError} from 'apollo-link-error';
import {split} from 'apollo-link';
import {WebSocketLink} from 'apollo-link-ws';
import {getMainDefinition} from 'apollo-utilities';
import {toIdValue} from 'apollo-utilities';

import App from "../../ui/App";

// Create an http link:
const httpLink = new HttpLink({
    uri: Meteor.absoluteUrl("graphql"),
    credentials: 'same-origin'
})

// Create a WebSocket link:
const wsLink = new WebSocketLink({
    uri: `ws://localhost:3200/subscriptions`,
    options: {
        reconnect: true
    }
});

// using the ability to split links, you can send data to each link
// depending on what kind of operation is being sent
const splitLink = split(
    // split based on operation type
    ({query}) => {
        const {kind, operation} = getMainDefinition(query);
        return kind === 'OperationDefinition' && operation === 'subscription';
    },
    wsLink,
    httpLink,
);

const authLink = new ApolloLink((operation, forward) => {
    const token = Accounts._storedLoginToken();
    operation.setContext(() => ({
        headers: {
            "meteor-login-token": token
        }
    }));
    return forward(operation);
});


const client = new ApolloClient({
    link: ApolloLink.from([
        onError(({graphQLErrors, networkError}) => {
            if (graphQLErrors)
                graphQLErrors.map(({message, locations, path}) =>
                    console.log(
                        `[GraphQL error]: Message: ${message}, Location: ${locations}, Path: ${path}`,
                    ),
                );
            if (networkError) console.log(`[Network error]: ${networkError}`);
        }),
        authLink,
        splitLink,
     ]),
    cache: new InMemoryCache({})
});

const ApolloApp = () => (
    <ApolloProvider client={client}>
        <App/>
    </ApolloProvider>
);

Meteor.startup(() => {
    render(<ApolloApp/>, document.getElementById("app"));
});

種類

type Resolution {
  _id: String!
  name: String!
  goals: [Goal]
  completed: Boolean
}

type Query {
  resolutions: [Resolution]
  getResolutionViaId(resolutionId: String!): Resolution
}

type Mutation {
  createResolution(name: String!): Resolution
}

type Subscription {
  resolutionWasAdded(userId: String!): Resolution
}

クエリ

let CREATE_RESOLUTION = gql`
    mutation createResolution($name: String!) {
      createResolution(name: $name) {
        __typename
        _id
        name
        ...resolutionGoals
        completed
      }
    }
    ${resolutionQueryFragments.resolutionGoals}
`;


const RESOLUTION_SUBSCRIBE = gql`
          subscription resolutionWasAdded($userId: String!){
              resolutionWasAdded(userId: $userId){
                __typename
                _id
                name
                ...resolutionGoals
                completed
              }
            } 
            ${resolutionQueryFragments.resolutionGoals}
    `;

リゾルバ

    Mutation: {
        createResolution(obj, args, {userId}) {
            let name = args.name;
            if (userId) {
                return Promise.resolve()
                    .then(() => {
                        const resolutionId = Resolutions.insert({
                            name,
                            userId
                        });
                        return resolutionId;
                    })
                    .then(resolutionId => {
                        const resAdded = Resolutions.findOne(resolutionId);
                        return resAdded;
                    })
                    .then(resolutionWasAdded => {
                        pubsub.publish('resolutionWasAdded', {resolutionWasAdded: args})

                        return resolutionWasAdded;
                    })
                    .catch((err) => {
                        console.log(err);
                    });
            }
            throw new Error("Unauthorized");
        }
    },

    Subscription: {
        resolutionWasAdded: {
            subscribe: withFilter(
                () => pubsub.asyncIterator("resolutionWasAdded"),
                (payload, variables) => {
                    debugger;
                    return true;
                })
        }
    }
}

Mutation リゾルバーの行pubsub.publish...は実行されますが、Subscription リゾルバーはアクティブになりません。

私は何が欠けていますか？

アップデート

クライアント クエリ コンポーネントでのサブスクリプションの設定方法を変更する必要があります。もっと発見したら、後でこの記事を更新します。

4

1 に答える 1