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# frozen_string_literal: true
class GraphqlChannel < ActionCable::Channel::Base
class QueryType < GraphQL::Schema::Object
field :value, Integer, null: false
def value
3
end
end
class PayloadType < GraphQL::Schema::Object
field :value, Integer, null: false
end
class CounterIncremented < GraphQL::Schema::Subscription
def self.reset_call_count
@@call_count = 0
end
reset_call_count
field :new_value, Integer, null: false
def update
if object
if object.value == "server-unsubscribe"
unsubscribe
elsif object.value == "server-unsubscribe-with-message"
unsubscribe({ new_value: 9999 })
end
end
result = {
new_value: @@call_count += 1
}
puts " -> CounterIncremented#update: #{result}"
result
end
end
class SubscriptionType < GraphQL::Schema::Object
field :payload, PayloadType, null: false do
argument :id, ID
end
field :counter_incremented, subscription: CounterIncremented
end
# Wacky behavior around the number 4
# so we can confirm it's used by the UI
module CustomSerializer
def self.load(value)
if value == "4x"
ExamplePayload.new(400)
else
GraphQL::Subscriptions::Serialize.load(value)
end
end
def self.dump(obj)
if obj.is_a?(ExamplePayload) && obj.value == 4
"4x"
else
GraphQL::Subscriptions::Serialize.dump(obj)
end
end
end
class GraphQLSchema < GraphQL::Schema
query(QueryType)
subscription(SubscriptionType)
use GraphQL::Subscriptions::ActionCableSubscriptions,
serializer: CustomSerializer,
broadcast: true,
default_broadcastable: true
end
def subscribed
@subscription_ids = []
end
def execute(data)
query = data["query"]
variables = data["variables"] || {}
operation_name = data["operationName"]
context = {
# Make sure the channel is in the context
channel: self,
}
puts "[GraphQLSchema.execute] #{query} || #{variables}"
result = GraphQLSchema.execute(
query: query,
context: context,
variables: variables,
operation_name: operation_name
)
payload = {
result: result.to_h,
more: result.subscription?,
}
# Track the subscription here so we can remove it
# on unsubscribe.
if result.context[:subscription_id]
@subscription_ids << result.context[:subscription_id]
end
puts " -> [transmit(#{result.context[:subscription_id]})] #{payload.inspect}"
transmit(payload)
end
def make_trigger(data)
field = data["field"]
args = data["arguments"]
value = data["value"]
value = value && ExamplePayload.new(value)
puts "[make_trigger] #{[field, args, value]}"
GraphQLSchema.subscriptions.trigger(field, args, value)
end
def unsubscribed
@subscription_ids.each { |sid|
puts "[delete_subscription] #{sid}"
GraphQLSchema.subscriptions.delete_subscription(sid)
}
end
# This is to make sure that GlobalID is used to load and dump this object
class ExamplePayload
include GlobalID::Identification
def initialize(value)
@value = value
end
def self.find(value)
self.new(value)
end
attr_reader :value
alias :id :value
end
end
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