我有一个准系统设置,用于通过 Action Cable 使用 graphql-ruby 更新广播。
- 客户端在订阅时收到初始有效负载。
- 客户端没有收到任何更新,并且
update
没有调用订阅类型的方法。后端没有错误。触发调用似乎被默默地忽略了。这就是我试图解决/正确理解它应该如何工作的问题。
我正在查看的文档:
- https://graphql-ruby.org/subscriptions/subscription_classes.html
- https://graphql-ruby.org/subscriptions/triggers
订阅类型:
module Types
class SubscriptionType < Types::BaseObject
field :server_info, subscription: Subscriptions::ServerInfoSubscription, null: false
end
end
module Subscriptions
class ServerInfoSubscription < Subscriptions::BaseSubscription
field :date_time, GraphQL::Types::ISO8601DateTime, null: false
def subscribe
{ date_time: DateTime.now }
end
def update
puts 'UPDATE CALLED' # Nope, it's not being called
super
end
end
end
我试图触发更新的方式:
MySchema.subscriptions.trigger(:server_info, {}, { date_time: DateTime.now })
架构定义为:
class MySchema < GraphQL::Schema
use GraphQL::Execution::Interpreter
use GraphQL::Subscriptions::ActionCableSubscriptions
subscription(Types::SubscriptionType)
end
我在 config/cable.yml 中为开发环境使用了 redis 适配器:
development:
adapter: redis
url: <%= ENV.fetch("REDIS_URL") { "redis://localhost:6379/1" } %>
channel_prefix: test-app_development
我错过了什么?任何故障排除提示?
更新:
一些诊断:
初始(和成功)订阅调用的 Rails 日志:
GraphqlChannel#execute({"query"=>"subscription ServerInfoSubscription {\n serverInfo {\n dateTime\n __typename\n }\n}\n", "variables"=>{}, "operationName"=>"ServerInfoSubscription"})
GraphqlChannel transmitting {"data"=>{"serverInfo"=>{"dateTime"=>"2020-10-08T10:47:08-04:00", "__typename"=>"ServerInfoSubscriptionPayload"}}}
GraphqlChannel is streaming from graphql-subscription:9087735b-9b99-4d66-8b77-ff3622c8efe7
GraphqlChannel is streaming from graphql-event::dateTime:
Started POST "/graphql" for 192.168.64.210 at 2020-10-08 10:47:08 -0400
检查活动的 Redis PubSub 频道:
$ redis-cli -h 192.168.64.210 -p 6379 pubsub channels
1) "test-app_development:graphql-subscription:9087735b-9b99-4d66-8b77-ff3622c8efe7"
2) "test-app_development:graphql-event::dateTime:"
3) "_action_cable_internal"
在 Rails 控制台中运行触发器调用的结果:
irb(main):001:0> MySchema.subscriptions.trigger(:server_info, {}, { date_time: DateTime.now })
[ActionCable] Broadcasting to graphql-event::serverInfo:: "{\"date_time\":\"2020-10-08T10:54:18-04:00\",\"__sym_keys__\":[\"date_time\"]}"
显而易见的是,Redis PubSub 频道称为“graphql-event::dateTime:”,而触发器调用通过不存在的“graphql-event::serverInfo:”频道进行广播。我不明白为什么实际的 Redis 频道被称为“graphql-event::dateTime”,而订阅查询位于顶级“ServerInfo”类型。