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ash

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A declarative, extensible framework for building Elixir applications.

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ash lib ash flow dsl.ex
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lib/ash/flow/dsl.ex

defmodule Ash.Flow.Dsl do
@debug %Spark.Dsl.Entity{
name: :debug,
describe: """
Declares a step that will inspect its input and provide
additional debug information.
""",
links: [],
examples: [
"""
debug :show_some_information do
input %{post: result(:create_post)}
end
"""
],
target: Ash.Flow.Step.Debug,
args: [:name],
schema: Ash.Flow.Step.Debug.schema()
}
@create %Spark.Dsl.Entity{
name: :create,
describe: """
Declares a step that will call a create action on a resource.
""",
examples: [
"""
create :create_post, MyApp.Post, :create
"""
],
links: [],
no_depend_modules: [:resource, :touches_resources],
modules: [:manual],
target: Ash.Flow.Step.Create,
args: [:name, :resource, :action],
schema: Ash.Flow.Step.Create.schema()
}
@update %Spark.Dsl.Entity{
name: :update,
describe: """
Declares a step that will call a update action on a resource.
""",
links: [],
examples: [
"""
update :update_post, MyApp.Post, :update do
record result(:get_post)
end
"""
],
no_depend_modules: [:resource, :touches_resources],
modules: [:manual],
target: Ash.Flow.Step.Update,
args: [:name, :resource, :action],
schema: Ash.Flow.Step.Update.schema()
}
@validate %Spark.Dsl.Entity{
name: :validate,
describe: """
Validates some input against an action.
""",
links: [],
examples: [
"""
validate :update_post, MyApp.Post, :update do
record result(:get_post)
only_keys [:name]
end
"""
],
no_depend_modules: [:resource, :touches_resources],
target: Ash.Flow.Step.Update,
args: [:name, :resource, :action],
schema: Ash.Flow.Step.Validate.schema()
}
@destroy %Spark.Dsl.Entity{
name: :destroy,
describe: """
Declares a step that will call a destroy action on a resource.
""",
links: [],
examples: [
"""
destroy :destroy_post, MyApp.Post, :destroy
"""
],
modules: [:manual],
no_depend_modules: [:resource, :touches_resources],
target: Ash.Flow.Step.Destroy,
args: [:name, :resource, :action],
schema: Ash.Flow.Step.Destroy.schema()
}
@read %Spark.Dsl.Entity{
name: :read,
describe: """
Declares a step that will call a read action on a resource.
""",
examples: [
"""
read :destroy_post, MyApp.Post, :destroy
"""
],
links: [],
no_depend_modules: [:resource, :touches_resources],
modules: [:manual],
target: Ash.Flow.Step.Read,
args: [:name, :resource, :action],
schema: Ash.Flow.Step.Read.schema()
}
@run_flow %Spark.Dsl.Entity{
name: :run_flow,
describe: """
Runs another flow as part of the current flow.
The return value of the step is the return value of the flow.
""",
links: [],
examples: [
"""
run_flow :get_org, GetOrgByName do
input %{
name: arg(:org_name)
}
"""
],
no_depend_modules: [:resource, :touches_resources],
target: Ash.Flow.Step.RunFlow,
args: [:name, :flow],
schema: Ash.Flow.Step.RunFlow.schema()
}
@custom %Spark.Dsl.Entity{
name: :custom,
describe: """
Runs a custom step module.
See `Ash.Flow.Step` for the necessary callbacks and more information.
""",
links: [],
examples: [
"""
custom :do_custom_thing, MyApp.DoCustomThing do
input %{...}
end
""",
"""
custom :do_custom_thing, {MyApp.DoCustomThing, opt1: :foo, opt2: :bar} do
input %{...}
end
"""
],
no_depend_modules: [:custom, :touches_resources],
target: Ash.Flow.Step.Custom,
args: [:name, :custom],
schema: Ash.Flow.Step.Custom.schema()
}
@argument %Spark.Dsl.Entity{
name: :argument,
describe: """
An argument to be passed into the flow
""",
examples: [
"""
argument :params, :map do
default %{}
end
""",
"""
argument :retries, :integer do
allow_nil? false
end
"""
],
links: [],
no_depend_modules: [:type],
target: Ash.Flow.Argument,
args: [:name, :type],
transform: {Ash.Type, :set_type_transformation, []},
schema: Ash.Flow.Argument.schema()
}
@flow %Spark.Dsl.Section{
name: :flow,
describe: """
Details about the flow itself, like description and the successful return type.
""",
entities: [
@argument
],
links: [],
schema: [
api: [
type: {:behaviour, Ash.Api},
doc: "An api to use by default when calling actions",
links: []
],
description: [
type: :string,
doc: "A description of the flow"
],
trace_name: [
type: :string,
doc: "The name to use when creating traces. Defaults to the short name."
],
short_name: [
type: :atom,
doc:
"A short name to use for the flow. Defaults to the last to parts of the module name, underscored."
],
returns: [
type: :any,
doc: """
The step or step that should constitute the return value.
""",
links: []
]
]
}
@step_entities [@create, @debug, @update, @destroy, @validate, @read, @run_flow, @custom]
@transaction %Spark.Dsl.Entity{
name: :transaction,
describe: """
Runs a set of steps in a transaction.
""",
schema: Ash.Flow.Step.Transaction.schema(),
target: Ash.Flow.Step.Transaction,
args: [:name, :resource],
recursive_as: :steps,
links: [],
entities: [
steps: @step_entities
],
no_depend_modules: [:touches_resources],
examples: [
"""
transaction :create_users do
create :create_user, User, :create do
input %{
first_name: {Faker.Person, :first_name, []},
last_name: {Faker.Person, :last_name, []}
}
end
create :create_user, Org, :create do
input %{
first_name: {Faker.Person, :first_name, []},
last_name: {Faker.Person, :last_name, []}
}
end
end
"""
]
}
@map %Spark.Dsl.Entity{
name: :map,
describe: """
Runs a set of steps for each item in a provided list.
""",
schema: Ash.Flow.Step.Map.schema(),
target: Ash.Flow.Step.Map,
args: [:name, :over],
recursive_as: :steps,
no_depend_modules: [:touches_resources],
links: [],
entities: [
steps: @step_entities
],
examples: [
"""
map :create_users, range(1, arg(:count)) do
output :create_user
create :create_user, Org, :create do
input %{
first_name: {Faker.Person, :first_name, []},
last_name: {Faker.Person, :last_name, []}
}
end
end
"""
]
}
@branch %Spark.Dsl.Entity{
name: :branch,
describe: """
Runs a set of steps based on a given value.
""",
schema: Ash.Flow.Step.Branch.schema(),
target: Ash.Flow.Step.Branch,
args: [:name, :condition],
recursive_as: :steps,
no_depend_modules: [:touches_resources],
links: [],
entities: [
steps: @step_entities
],
examples: [
"""
branch :create_users, result(:create_users?) do
output :create_user
create :create_user, Org, :create do
input %{
first_name: {Faker.Person, :first_name, []},
last_name: {Faker.Person, :last_name, []}
}
end
end
"""
]
}
transaction = %{@transaction | entities: [steps: [@branch | [@map | @step_entities]]]}
map = %{@map | entities: [steps: [@branch | [@transaction | @step_entities]]]}
branch = %{@branch | entities: [steps: [@map | [@transaction | @step_entities]]]}
@transaction transaction
@map map
@branch branch
@steps %Spark.Dsl.Section{
name: :steps,
describe: """
The steps to run.
""",
examples: [
"""
steps do
# invokes a create action
create :create_post, MyApp.Post, :create
end
"""
],
links: [],
imports: [Ash.Flow.StepHelpers],
entities: [@map, @transaction, @branch] ++ @step_entities
}
@transformers [
Ash.Flow.Transformers.SetApi,
Ash.Flow.Transformers.ValidateUniqueNames,
Ash.Flow.Transformers.ValidateNoEmptySteps
]
@sections [@flow, @steps]
@moduledoc """
The built in flow DSL.
<!--- ash-hq-hide-start--> <!--- -->
## DSL Documentation
### Index
#{Spark.Dsl.Extension.doc_index(@sections)}
### Docs
#{Spark.Dsl.Extension.doc(@sections)}
<!--- ash-hq-hide-stop--> <!--- -->
"""
use Spark.Dsl.Extension,
sections: @sections,
transformers: @transformers
end