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A declarative, extensible framework for building Elixir applications.

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ash lib ash api api.ex
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lib/ash/api/api.ex

defmodule Ash.Api do
@using_schema Ashton.schema(
opts: [
interface?: :boolean,
max_page_size: :integer,
default_page_size: :integer
],
defaults: [
interface?: true,
max_page_size: 100,
default_page_size: 25
],
describe: [
interface?:
"If set to false, no code interface is defined for this resource e.g `MyApi.create(...)` is not defined.",
max_page_size:
"The maximum page size for any read action. Any request for a higher page size will simply use this number. Uses the smaller of the Api's or Resource's value.",
default_page_size:
"The default page size for any read action. If no page size is specified, this value is used. Uses the smaller of the Api's or Resource's value."
],
constraints: [
max_page_size:
{&Ash.Constraints.greater_than_zero?/1, "must be greater than zero"},
default_page_size:
{&Ash.Constraints.greater_than_zero?/1, "must be greater than zero"}
]
)
@moduledoc """
An Api allows you to interact with your resources, anc holds non-resource-specific configuration.
Your Api can also house config that is not resource specific.
Defining a resource won't do much for you. Once you have some resources defined,
you include them in an Api like so:
```elixir
defmodule MyApp.Api do
use Ash.Api
resources [OneResource, SecondResource]
end
```
Then you can interact through that Api with the actions that those resources expose.
For example: `MyApp.Api.create(OneResource, %{attributes: %{name: "thing"}})`, or
`MyApp.Api.read(OneResource, %{filter: %{name: "thing"}})`. Corresponding actions must
be defined in your resources in order to call them through the Api.
"""
defmacro __using__(opts) do
quote bind_quoted: [opts: opts] do
@before_compile Ash.Api
opts =
case Ashton.validate(opts, Ash.Api.using_schema()) do
{:ok, opts} ->
opts
{:error, [{key, message} | _]} ->
raise Ash.Error.ApiDslError,
using: __MODULE__,
option: key,
message: message
end
@default_page_size nil
@max_page_size nil
@interface? opts[:interface?]
@side_load_type :simple
@side_load_config []
Module.register_attribute(__MODULE__, :mix_ins, accumulate: true)
Module.register_attribute(__MODULE__, :resources, accumulate: true)
Module.register_attribute(__MODULE__, :named_resources, accumulate: true)
import Ash.Api,
only: [
resources: 1,
parallel_side_load: 1
]
end
end
@doc false
def using_schema(), do: @using_schema
defmacro resources(resources) do
quote do
Enum.map(unquote(resources), fn resource ->
case resource do
{name, resource} ->
@resources resource
@named_resources {name, resource}
resource ->
@resources resource
end
end)
end
end
@parallel_side_load_schema Ashton.schema(
opts: [
supervisor: :atom,
max_concurrency: :integer,
timeout: :integer,
shutdown: :integer
],
required: [:supervisor],
defaults: [
timeout: 5000,
shutdown: 5000
],
describe: [
supervisor:
"The name of the task supervisor that will supervise the parallel side loading tasks.",
max_concurrency:
"The total number of side loads (per side load nesting level, per ongoing side load) that can be running. Uses `System.schedulers_online/0` if unset.",
timeout:
"the maximum amount of time to wait (in milliseconds) without receiving a task reply. see `task.supervisor.async_stream/6`",
shutdown:
"an integer indicating the timeout value. Defaults to 5000 milliseconds"
],
constraints: [
max_concurrency:
{&Ash.Constraints.greater_than_zero?/1,
"must be greater than zero"},
timeout: {&Ash.Constraints.positive?/1, "must be positive"},
shutdown: {&Ash.Constraints.positive?/1, "must be positive"}
]
)
@doc false
def parallel_side_load_schema(), do: @parallel_side_load_schema
@doc """
By default, side loading data happens synchronously. In order to
side load in parallel, you must start a task supervisor in your application
and provide the name of that task supervisor to your `Api`. Other concurrency
options for parallel side loading can happen here.
You can add a task supervisor to your application, by adding:
`{Task.Supervisor, name: MyApp.MyName}` to the list of children. Then, you'd configure
`supervisor: MyApp.MyName`.
#{Ashton.document(@parallel_side_load_schema, header_depth: 2)}
"""
defmacro parallel_side_load(opts \\ []) do
quote bind_quoted: [opts: opts] do
case Ashton.validate(opts, Ash.Api.parallel_side_load_schema()) do
{:ok, opts} ->
@side_load_type :parallel
@side_load_config [
supervisor: opts[:supervisor],
max_concurrency: opts[:max_concurrency],
timeout: opts[:timeout],
shutdown: opts[:shutdown]
]
{:error, [{key, message} | _]} ->
raise Ash.Error.ApiDslError,
path: [:parallel_side_load],
option: key,
message: message
end
end
end
defmacro __before_compile__(env) do
quote generated: true do
def default_page_size(), do: @default_page_size
def max_page_size(), do: @max_page_size
def mix_ins(), do: @mix_ins
def resources(), do: @resources
def side_load_config(), do: {@side_load_type, @side_load_config}
def get_resource(mod) when mod in @resources, do: {:ok, mod}
def get_resource(name) do
Keyword.fetch(@named_resources, name)
end
if @interface? do
use Ash.Api.Interface
end
Enum.map(@mix_ins, fn hook_module ->
code = hook_module.before_compile_hook(unquote(Macro.escape(env)))
Module.eval_quoted(__MODULE__, code)
end)
end
end
end