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action_transformer.ex
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action_transformer.ex
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defmodule Ash.Reactor.Dsl.ActionTransformer do
@moduledoc """
Responsible for transforming actions.
"""
alias Ash.{Domain, Resource}
alias Reactor.Utils
alias Spark.{Dsl, Dsl.Transformer, Error.DslError}
use Transformer
@doc false
@impl true
@spec before?(module) :: boolean
def before?(Reactor.Dsl.Transformer), do: true
def before?(_), do: false
@doc false
@impl true
@spec transform(Dsl.t()) :: {:ok, Dsl.t()} | {:error, DslError.t()}
def transform(dsl_state) do
dsl_state
|> Transformer.get_entities([:reactor])
|> Utils.reduce_while_ok(dsl_state, fn entity, dsl_state ->
case transform_step(entity, dsl_state) do
{:ok, entity, dsl_state} ->
{:ok, Transformer.replace_entity(dsl_state, [:reactor], entity)}
{:error, reason} ->
{:error, reason}
:ignore ->
{:ok, dsl_state}
end
end)
end
defp transform_step(entity, dsl_state) when entity.action_step? do
with {:ok, entity} <- transform_entity_domain(entity, dsl_state),
:ok <- validate_entity_domain(entity, dsl_state),
:ok <- validate_entity_resource(entity, dsl_state),
{:ok, action} <- get_entity_resource_action(entity, dsl_state),
entity <- %{entity | action: action.name},
:ok <- validate_entity_input_names(entity, action, dsl_state),
:ok <- validate_entity_input_dupes(entity, dsl_state),
:ok <- validate_entity_input_empty(entity, dsl_state),
:ok <- maybe_validate_upsert_identity(entity, dsl_state) do
transform_nested_steps(entity, dsl_state)
end
end
defp transform_step(entity, dsl_state) when entity.type == :transaction do
with :ok <- validate_entity_resources(entity, dsl_state) do
transform_nested_steps(entity, dsl_state)
end
end
defp transform_step(_entity, _dsl_state), do: :ignore
defp transform_nested_steps(entity, dsl_state) when is_list(entity.steps) do
entity.steps
|> Enum.reduce_while({:ok, %{entity | steps: []}, dsl_state}, fn
step, {:ok, entity, dsl_state} ->
case transform_step(step, dsl_state) do
{:ok, step, dsl_state} ->
{:cont, {:ok, %{entity | steps: [step | entity.steps]}, dsl_state}}
:ignore ->
{:cont, {:ok, %{entity | steps: [step | entity.steps]}, dsl_state}}
{:error, reason} ->
{:halt, {:error, reason}}
end
end)
|> case do
{:ok, entity, dsl_state} -> {:ok, %{entity | steps: Enum.reverse(entity.steps)}, dsl_state}
other -> other
end
end
defp transform_nested_steps(entity, dsl_state),
do: {:ok, entity, dsl_state}
defp transform_entity_domain(entity, dsl_state) do
resource_domain = Resource.Info.domain(entity.resource)
default_domain = Transformer.get_option(dsl_state, [:ash], :default_domain)
{:ok, %{entity | domain: entity.domain || resource_domain || default_domain}}
end
defp validate_entity_domain(entity, dsl_state) do
if entity.domain.spark_is() == Domain do
:ok
else
{:error,
DslError.exception(
module: Transformer.get_entities(dsl_state, :module),
path: [:reactor, entity.type, entity.name],
message:
"The #{entity.type} step `#{inspect(entity.name)}` has its domain set to `#{inspect(entity.domain)}` but it is not a valid `Ash.Domain`."
)}
end
end
defp validate_entity_resource(entity, dsl_state) do
if entity.resource.spark_is() == Resource do
:ok
else
{:error,
DslError.exception(
module: Transformer.get_persisted(dsl_state, :module),
path: [:reactor, entity.type, entity.name],
message:
"The #{entity.type} step `#{inspect(entity.name)}` has its resource set to `#{inspect(entity.resource)}` but it is not a valid Ash resource."
)}
end
end
defp validate_entity_resources(entity, dsl_state) do
entity.resources
|> Enum.reject(&(&1.spark_is() == Resource))
|> case do
[] ->
:ok
[resource] ->
{:error,
DslError.exception(
module: Transformer.get_persisted(dsl_state, :module),
path: [:reactor, entity.type, entity.name],
message:
"The #{entity.type} step `#{inspect(entity.name)}` has its resources set to `#{inspect(resource)}` but it is not a valid Ash resource."
)}
resources ->
resources = Enum.map_join(resources, ", ", &"`#{inspect(&1)}`")
{:error,
DslError.exception(
module: Transformer.get_persisted(dsl_state, :module),
path: [:reactor, entity.type, entity.name],
message:
"The #{entity.type} step `#{inspect(entity.name)}` has its resources set to #{resources} but they are not valid Ash resources."
)}
end
end
defp validate_entity_input_dupes(%{inputs: [_]} = _entity, _dsl_state), do: :ok
defp validate_entity_input_dupes(%{inputs: [_ | _]} = entity, dsl_state) do
entity.inputs
|> Enum.map(&MapSet.new(Map.keys(&1.template)))
|> Enum.reduce(&MapSet.intersection/2)
|> Enum.to_list()
|> case do
[] ->
:ok
[key] ->
message = """
The #{entity.type} step `#{inspect(entity.name)}` defines multiple inputs for `#{key}`.
"""
{:error,
DslError.exception(
module: Transformer.get_persisted(dsl_state, :module),
path: [:reactor, entity.type, entity.name],
message: message
)}
keys ->
keys_sentence =
keys
|> Enum.map(&"`#{&1}`")
|> to_sentence(final_sep: " and ")
message = """
The #{entity.type} step `#{inspect(entity.name)}` defines multiple inputs for the keys #{keys_sentence}.
"""
{:error,
DslError.exception(
module: Transformer.get_persisted(dsl_state, :module),
path: [:reactor, entity.type, entity.name],
message: message
)}
end
end
defp validate_entity_input_dupes(_entity, _dsl_state), do: :ok
defp validate_entity_input_empty(entity, dsl_state) do
entity.inputs
|> Enum.filter(&Enum.empty?(&1.template))
|> case do
[] ->
:ok
[_] ->
message = """
The #{entity.type} step `#{inspect(entity.name)}` defines an empty input template.
"""
{:error,
DslError.exception(
module: Transformer.get_persisted(dsl_state, :module),
path: [:reactor, entity.type, entity.name],
message: message
)}
_ ->
message = """
The #{entity.type} step `#{inspect(entity.name)}` defines empty input templates.
"""
{:error,
DslError.exception(
module: Transformer.get_persisted(dsl_state, :module),
path: [:reactor, entity.type, entity.name],
message: message
)}
end
end
defp validate_entity_input_names(entity, action, dsl_state) do
argument_names = Enum.map(action.arguments, & &1.name)
allowed_input_names =
entity.resource
|> Resource.Info.attributes()
|> Enum.map(& &1.name)
|> maybe_accept_inputs(action)
|> maybe_reject_inputs(action)
|> Enum.concat(argument_names)
|> MapSet.new()
provided_input_names =
entity.inputs
|> Enum.flat_map(&Map.keys(&1.template))
|> MapSet.new()
provided_input_names
|> MapSet.difference(allowed_input_names)
|> Enum.to_list()
|> case do
[] ->
:ok
[extra] ->
suggestions =
allowed_input_names
|> Enum.map(&to_string/1)
|> sorted_suggestions(extra)
message = """
The #{entity.type} step `#{inspect(entity.name)} refers to an input named `#{extra}` which doesn't exist.
#{suggestions}
"""
{:error,
DslError.exception(
module: Transformer.get_persisted(dsl_state, :module),
path: [:reactor, entity.type, entity.name],
message: message
)}
extras ->
suggestions =
allowed_input_names
|> Enum.map(&to_string/1)
|> sorted_suggestions(hd(extras))
extras_sentence =
extras
|> Enum.map(&"`#{&1}`")
|> to_sentence(final_sep: " and ")
message = """
The #{entity.type} step `#{inspect(entity.name)} refers to an inputs named #{extras_sentence} which don't exist.
#{suggestions}
"""
{:error,
DslError.exception(
module: Transformer.get_persisted(dsl_state, :module),
path: [:reactor, entity.type, entity.name],
message: message
)}
end
end
defp maybe_accept_inputs(input_names, action) when length(action.accepts) > 0,
do: Enum.filter(input_names, &(&1 in action.accepts))
defp maybe_accept_inputs(input_names, _), do: input_names
defp maybe_reject_inputs(input_names, action) when length(action.rejects) > 0,
do: Enum.filter(input_names, &(&1 in action.rejects))
defp maybe_reject_inputs(input_names, _), do: input_names
defp get_entity_resource_action(entity, dsl_state) when is_nil(entity.action) do
entity.resource
|> Resource.Info.actions()
|> Enum.find(&(&1.type == entity.type && &1.primary?))
|> case do
nil ->
suggestions =
entity.resource
|> Resource.Info.actions()
|> Enum.filter(&(&1.type == entity.type))
|> Enum.map(&to_string(&1.name))
|> sorted_suggestions(entity.action,
prefix: "Available #{entity.type} actions are ",
suffix: ".",
final_sep: " and "
)
{:error,
DslError.exception(
module: Transformer.get_persisted(dsl_state, :module),
path: [:reactor, entity.type, entity.name],
message:
"The step `#{inspect(entity.name)}` has no action name specified and no primary #{entity.type} action." <>
suggestions
)}
action ->
{:ok, action}
end
end
defp get_entity_resource_action(entity, dsl_state) do
case Resource.Info.action(entity.resource, entity.action, entity.type) do
nil ->
suggestions =
entity.resource
|> Resource.Info.actions()
|> Enum.filter(&(&1.type == entity.type))
|> Enum.map(&to_string(&1.name))
|> sorted_suggestions(entity.action)
{:error,
DslError.exception(
module: Transformer.get_persisted(dsl_state, :module),
path: [:reactor, entity.type, entity.name],
message:
"The #{entity.type} step `#{inspect(entity.name)}` refers to an action named `#{entity.action}` which doesn't exist." <>
suggestions
)}
action ->
{:ok, action}
end
end
defp maybe_validate_upsert_identity(entity, dsl_state)
when entity.upsert? and entity.upsert_identity do
if Resource.Info.identity(entity.resource, entity.upsert_identity) do
:ok
else
suggestions =
entity.resource
|> Resource.Info.identities()
|> Enum.map(& &1.name)
|> sorted_suggestions(entity.upsert_identity)
{:error,
DslError.exception(
module: Transformer.get_persisted(dsl_state, :module),
path: [:reactor, entity.type, entity.name],
message:
"The #{entity.type} step `#{inspect(entity.name)}` refers to an identity named `#{entity.upsert_identity}` but it does not exist." <>
suggestions
)}
end
end
defp maybe_validate_upsert_identity(_entity, _dsl_state), do: :ok
defp sorted_suggestions(suggestions, tried, options \\ [])
defp sorted_suggestions([], _, _), do: ""
defp sorted_suggestions(suggestions, tried, options) do
tried = to_string(tried)
prefix = Keyword.get(options, :prefix, "Did you mean ")
suffix = Keyword.get(options, :suffix, "?")
suggestions
|> Enum.map(&to_string/1)
|> Enum.sort_by(&String.jaro_distance(&1, tried))
|> Enum.map(&"`#{&1}`")
|> to_sentence(options)
|> then(&"\n\n#{prefix}#{&1}#{suffix}")
end
defp to_sentence([value], _opts), do: to_string(value)
defp to_sentence([_ | _] = values, opts) do
[last | rest] = Enum.reverse(values)
sep = Keyword.get(opts, :sep, ", ")
final_sep = Keyword.get(opts, :final_sep, " or ")
rest =
rest
|> Enum.reverse()
|> Enum.join(sep)
"#{rest}#{final_sep}#{last}"
end
end