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absinthe
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Files
lib/absinthe/subscription/proxy.ex
defmodule Absinthe.Subscription.Proxy do
@moduledoc false
use GenServer
defstruct [
:pubsub,
:node
]
alias Absinthe.Subscription
def start_link(pubsub, shard) do
GenServer.start_link(__MODULE__, {pubsub, shard})
end
def topic(shard), do: "__absinthe__:proxy:#{shard}"
def init({pubsub, shard}) do
node_name = pubsub.node_name()
:ok = pubsub.subscribe(topic(shard))
{:ok, %__MODULE__{pubsub: pubsub, node: node_name}}
end
def handle_info(%{node: src_node}, %{node: node} = state) when src_node == node do
{:noreply, state}
end
def handle_info(payload, state) do
# There's no meaningful form of backpressure to have here, and we can't
# bottleneck execution inside each proxy process
# TODO: This should maybe be supervised? I feel like the linking here isn't
# what it should be.
Task.start_link(fn ->
Subscription.Local.publish_mutation(
state.pubsub,
payload.mutation_result,
payload.subscribed_fields
)
end)
{:noreply, state}
end
end