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Step flow manager for Elixir applications
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lib/step_flow/amqp/worker_discovery_consumer.ex
defmodule StepFlow.Amqp.WorkerDiscoveryConsumer do
@moduledoc """
Consumer of Worker Descriptions.
"""
require Logger
alias StepFlow.Amqp.WorkerDiscoveryConsumer
alias StepFlow.Repo.Checker
alias StepFlow.WorkerDefinitions
use StepFlow.Amqp.CommonConsumer, %{
queue: "worker_discovery",
exchange: "worker_response",
prefetch_count: 1,
consumer: &WorkerDiscoveryConsumer.consume/4
}
@doc """
Consume messages, create Worker Definition if it's not already declared.
"""
def consume(channel, tag, _redelivered, payload) do
if Checker.repo_running?() do
if WorkerDefinitions.exists(payload) do
label = Map.get(payload, "label")
version = Map.get(payload, "version")
Logger.debug("don't re-register worker: #{label} #{version}")
Basic.ack(channel, tag)
else
case WorkerDefinitions.create_worker_definition(payload) do
{:ok, _} ->
Basic.ack(channel, tag)
{:error, reason} ->
Logger.error("unable to register new worker: #{inspect(reason)}")
Basic.nack(channel, tag)
end
end
else
Logger.warn(
"#{__MODULE__}: The database is not available, reject and requeue consumed message..."
)
Basic.reject(channel, tag, requeue: true)
end
end
end