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Use Commanded to build your own Elixir applications following the CQRS/ES pattern.
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Files
test/process_managers/process_manager_error_handling_test.exs
defmodule Commanded.ProcessManager.ProcessManagerErrorHandlingTest do
use Commanded.StorageCase
alias Commanded.Helpers.ProcessHelper
alias Commanded.ProcessManagers.{
ErrorHandlingProcessManager,
ErrorRouter,
}
alias Commanded.ProcessManagers.ErrorAggregate.Commands.StartProcess
setup do
reply_to = self()
{:ok, agent} = Agent.start_link(fn -> reply_to end, name: {:global, ErrorHandlingProcessManager})
on_exit fn ->
ProcessHelper.shutdown(agent)
end
end
test "should retry the event until process manager requests stop" do
process_uuid = UUID.uuid4()
command = %StartProcess{
process_uuid: process_uuid,
strategy: "retry",
reply_to: reply_to(),
}
{:ok, process_router} = ErrorHandlingProcessManager.start_link()
Process.unlink(process_router)
ref = Process.monitor(process_router)
assert :ok = ErrorRouter.dispatch(command)
assert_receive {:error, :failed, %{attempts: 1}}
assert_receive {:error, :failed, %{attempts: 2}}
assert_receive {:error, :too_many_attempts, %{attempts: 3}}
# should shutdown process router
assert_receive {:DOWN, ^ref, _, _, _}
end
test "should retry event with specified delay between attempts" do
process_uuid = UUID.uuid4()
command = %StartProcess{
process_uuid: process_uuid,
strategy: "retry",
delay: 10,
reply_to: reply_to(),
}
{:ok, process_router} = ErrorHandlingProcessManager.start_link()
Process.unlink(process_router)
ref = Process.monitor(process_router)
assert :ok = ErrorRouter.dispatch(command)
assert_receive {:error, :failed, %{attempts: 1, delay: 10}}
assert_receive {:error, :failed, %{attempts: 2, delay: 10}}
assert_receive {:error, :too_many_attempts, %{attempts: 3}}
# should shutdown process router
assert_receive {:DOWN, ^ref, _, _, _}
end
test "should skip the event when error reply is `{:skip, :continue_pending}`" do
process_uuid = UUID.uuid4()
command = %StartProcess{
process_uuid: process_uuid,
strategy: "skip",
reply_to: reply_to(),
}
{:ok, process_router} = ErrorHandlingProcessManager.start_link()
assert :ok = ErrorRouter.dispatch(command)
assert_receive {:error, :failed, %{attempts: 1}}
refute_receive {:error, :failed, %{attempts: 2}}
# should not shutdown process router
assert Process.alive?(process_router)
end
test "should continue with modified command" do
process_uuid = UUID.uuid4()
command = %StartProcess{
process_uuid: process_uuid,
strategy: "continue",
reply_to: reply_to(),
}
{:ok, process_router} = ErrorHandlingProcessManager.start_link()
assert :ok = ErrorRouter.dispatch(command)
assert_receive {:error, :failed, %{attempts: 1}}
assert_receive :process_continued
# should not shutdown process router
assert Process.alive?(process_router)
end
test "should stop process manager on error by default" do
process_uuid = UUID.uuid4()
command = %StartProcess{process_uuid: process_uuid}
{:ok, process_router} = ErrorHandlingProcessManager.start_link()
Process.unlink(process_router)
ref = Process.monitor(process_router)
assert :ok = ErrorRouter.dispatch(command)
# should shutdown process router
assert_receive {:DOWN, ^ref, _, _, _}
refute Process.alive?(process_router)
end
defp reply_to, do: self() |> :erlang.pid_to_list()
end