Question

我有一个由两部分组成的应用程序：一个使用graphql-subscriptions的React前端和一个带an MQTT broker的Node.js应用程序（及其Web套接字处理程序）和a subscription server。 As stated here，我没有使用默认的PubSub实现（正在运行），而是尝试实现外部PubSub引擎，为此，我选择了graphql-redis-subscriptions。每当邮件到达服务器时，我都会收到以下错误：

2018-03-27 14:52:03: assert.js:42
throw new errors.AssertionError({
   ^
 AssertionError [ERR_ASSERTION]: undefined == true
   at MQEmitterRedis.emit (node_modules/mqemitter/mqemitter.js:98:3)
   at handler (node_modules/mqemitter-redis/mqemitter-redis.js:36:12)
   at Redis.<anonymous> (node_modules/mqemitter-redis/mqemitter-redis.js:46:5)
   at emitThree (events.js:136:13)
   at Redis.emit (events.js:217:7)
   at Redis.exports.returnReply ( node_modules/ioredis/lib/redis/parser.js:119:14)
   at JavascriptRedisParser.returnReply ( node_modules/ioredis/lib/redis/parser.js:27:13)
   at JavascriptRedisParser.execute ( node_modules/redis-parser/lib/parser.js:574:12)
   at Socket.<anonymous> ( node_modules/ioredis/lib/redis/event_handler.js:107:22)
   at emitOne (events.js:116:13)
   at Socket.emit (events.js:211:7)
   at addChunk (_stream_readable.js:263:12)
   at readableAddChunk (_stream_readable.js:250:11)
   at Socket.Readable.push (_stream_readable.js:208:10)
   at TCP.onread (net.js:594:20)

我无法理解这里发生了什么。 By looking at the code, it seems that this assert is failing because the argument is undefined。以下是PubSub.js文件的配置，在发布内容时需要导入该文件：

import { RedisPubSub } from 'graphql-redis-subscriptions';
import config from '../config/getConfig';

const { port, host } = config.redisConf;

// Options listed here: https://github.com/luin/ioredis/blob/master/API.md#new_Redis_new
const pubsub = new RedisPubSub({
    connection: {
        host,
        port,
        retry_strategy: options => Math.max(options.attempt * 100, 3000),
    },
});

export default pubsub;

然后，在另一个文件中，我只导入import pubSub from '../../helpers/PubSub';并使用以下代码发布主题：

pubSub.publish(topic, { operation: { ... }});

你能否建议我做错了什么？感谢

Graphql订阅因Redis实现而失败

0 个答案: