Class: GraphQL::Subscriptions::Instrumentation::SubscriptionRegistrationResolve

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/subscriptions/instrumentation.rb

Instance Method Summary collapse

Constructor Details

#initialize(inner_proc) ⇒ SubscriptionRegistrationResolve

Returns a new instance of SubscriptionRegistrationResolve.



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# File 'lib/graphql/subscriptions/instrumentation.rb', line 40

def initialize(inner_proc)
  @inner_proc = inner_proc
end

Instance Method Details

#call(obj, args, ctx) ⇒ Object

Wrap the proc with subscription registration logic



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# File 'lib/graphql/subscriptions/instrumentation.rb', line 45

def call(obj, args, ctx)
  result = nil
  if @inner_proc && !@inner_proc.is_a?(GraphQL::Field::Resolve::BuiltInResolve)
    result = @inner_proc.call(obj, args, ctx)
  end

  events = ctx.namespace(:subscriptions)[:events]

  if events
    # This is the first execution, so gather an Event
    # for the backend to register:
    events << Subscriptions::Event.new(
      name: ctx.field.name,
      arguments: args,
      context: ctx,
    )
    result
  elsif ctx.irep_node.subscription_topic == ctx.query.subscription_topic
    if !result.nil?
      result
    elsif obj.is_a?(GraphQL::Schema::Object)
      # The root object is _already_ the subscription update:
      obj.object
    else
      obj
    end
  else
    # This is a subscription update, but this event wasn't triggered.
    ctx.skip
  end
end