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3.27.0
3.26.0
3.25.2
3.25.1
3.25.0
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3.24.7
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3.14.1
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3.13.2
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3.7.1
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3.6.3
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2.19.14
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2.19.6
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2.19.1
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2.19.0
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2.18.2
2.18.1
2.18.0
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2.15.20
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2.15.16
2.15.15
2.15.14
2.15.13
2.15.12
2.15.11
2.15.10
2.15.9
2.15.8
2.15.7
2.15.6
2.15.5
2.15.4
2.15.2
2.15.1
2.15.0
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2.14.19
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2.14.3
2.14.2
2.14.1
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2.13.4
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2.13.3
2.13.2
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2.11.11
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2.11.8
2.11.7
2.11.6
2.11.5
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2.9.23
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2.9.19
2.9.18
2.9.17
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2.9.15
2.9.14
2.9.13
2.9.12
2.9.11
2.9.10
2.9.9
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2.9.7
2.9.6
2.9.5
2.9.4
2.9.3
2.9.2
2.9.1
2.9.0
2.8.1
2.8.0
2.7.1
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2.6.31
2.6.30
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1.43.10
1.43.9
1.43.8
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1.43.6
1.43.5
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1.36.22
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1.36.12
1.36.11
1.36.10
1.36.9
1.36.8
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1.31.1
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1.30.2
1.30.1
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1.27.1
1.27.0
1.26.13
1.26.12
1.26.11
1.26.10
1.26.9
1.26.8
1.26.7
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1.25.6
1.25.5
1.25.4
1.25.3
1.25.2
1.25.1
1.25.0
1.24.2
1.24.1
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1.23.3
1.23.2
1.23.1
1.23.0
1.22.1
1.22.0
1.20.1
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1.19.1
1.19.0
1.18.1
1.18.0
1.17.1
1.17.0
1.16.2
1.15.1
1.15.0
1.14.0
1.13.4
1.13.3
1.13.2
1.13.1
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A declarative, extensible framework for building Elixir applications.
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lib/ash/behaviour_helpers.ex
# SPDX-FileCopyrightText: 2019 ash contributors <https://github.com/ash-project/ash/graphs/contributors>
#
# SPDX-License-Identifier: MIT
defmodule Ash.BehaviourHelpers do
@moduledoc """
Helpers for Ash behaviour modules: return-type validation and documentation of the wrapper pattern.
## Behaviour invocation pattern
Implementation modules (e.g. a module that `@behaviour Ash.Resource.Change`) should be invoked
**only through the behaviour module's public wrapper callbacks**. Call sites must call
`SomeBehaviour.callback(implementation_module, ...)` rather than
`implementation_module.callback(...)`.
Those wrappers:
* Give **Dialyzer** a single place to see the callback’s return type via `@spec`, improving static checks.
* **Enforce the return shape at runtime**: if the implementation returns a value that doesn’t match the
behaviour’s callback return type, the wrapper raises `Ash.Error.Framework.InvalidReturnType` with a
message that identifies the behaviour, callback (e.g. `module.function/arity`), and the allowed
return shapes.
Use `call_and_validate_return/5` (or the `check_type!/3` macro where appropriate) inside the
behaviour’s wrapper to perform the validation.
## Dialyzer
Wrapper `@spec`s were added so that Dialyzer can check return types at call sites. Any remaining
Dialyzer warnings in the codebase (e.g. in `lib/ash/actions/action.ex`, `lib/ash/can.ex`,
`lib/ash/actions/read/read.ex`, `lib/ash/actions/read/relationships.ex`, `lib/ash/actions/update/update.ex`,
`lib/ash/actions/create/create.ex`, `lib/ash/policy/chart/mermaid.ex`) are pre-existing and not
caused by the behaviour wrapper specs.
"""
@doc """
Calls a callback and validates its return value against allowed patterns.
Takes the same pattern format as `check_type!/3`: atoms (exact match),
tuples (use `:_` for "any" in a position), or structs (match by struct type).
Returns the result if it matches any pattern; otherwise raises
`Ash.Error.Framework.InvalidReturnType` with a message including the
behaviour name, callback name, and allowed shapes.
## Options
* `:behaviour` - Module name of the behaviour (for error message).
* `:callback_name` or `:function` - Human-readable callback name, e.g. `"change/3"` (for error message).
## Examples
# With valid return
call_and_validate_return(MyMod, :change, [cs, opts, ctx], [%Ash.Changeset{}], behaviour: Ash.Resource.Change, callback_name: "change/3")
# => %Ash.Changeset{...}
# With invalid return (raises)
call_and_validate_return(MyMod, :run, [], [:ok], [])
# => raises Ash.Error.Framework.InvalidReturnType
"""
@spec call_and_validate_return(module(), atom(), [term()], [term()], keyword()) :: term()
def call_and_validate_return(module, callback_atom, args_list, allowed_patterns, opts \\ []) do
result = apply(module, callback_atom, args_list)
if Enum.any?(allowed_patterns, &matches_pattern?(result, &1)) do
result
else
behaviour_name = opts[:behaviour] && inspect(opts[:behaviour])
callback_name = resolve_callback_name(opts, callback_atom, args_list)
pattern_list = Enum.map_join(allowed_patterns, "\n ", &pattern_to_string/1)
message =
[
"Invalid value returned from #{inspect(module)}.#{callback_name}.",
if(behaviour_name,
do:
"The callback #{behaviour_name}.#{callback_name} expects one of the following return types:",
else: "Expected one of the following return types:"
),
"",
" " <> pattern_list
]
|> Enum.join("\n")
raise Ash.Error.Framework.InvalidReturnType, message: message
end
end
defp resolve_callback_name(opts, callback_atom, args_list) do
arity = length(args_list)
case {opts[:callback_name], opts[:function]} do
{name, _} when is_binary(name) -> name
{_, fun} when is_atom(fun) -> "#{fun}/#{arity}"
_ -> "#{callback_atom}/#{arity}"
end
end
defp matches_pattern?(value, pattern) when is_atom(pattern) do
value === pattern
end
defp matches_pattern?(value, pattern) when is_tuple(pattern) do
is_tuple(value) and tuple_size(value) == tuple_size(pattern) and
pattern
|> Tuple.to_list()
|> Enum.with_index()
|> Enum.all?(fn {elem_pattern, i} ->
elem_value = elem(value, i)
elem_pattern == :_ or matches_pattern?(elem_value, elem_pattern)
end)
end
defp matches_pattern?(value, pattern) when is_struct(pattern) do
is_struct(value) and value.__struct__ == pattern.__struct__
end
defp matches_pattern?(value, pattern) do
value == pattern
end
defp pattern_to_string(atom) when is_atom(atom) do
inspect(atom)
end
defp pattern_to_string(tuple) when is_tuple(tuple) do
parts =
tuple
|> Tuple.to_list()
|> Enum.map(fn
:_ -> "_"
other -> inspect(other)
end)
"{" <> Enum.join(parts, ", ") <> "}"
end
defp pattern_to_string(struct) when is_struct(struct) do
"%#{inspect(struct.__struct__)}{}"
end
defp pattern_to_string(other) do
inspect(other)
end
defmacro check_type!(module, result, patterns) do
{function, arity} = __CALLER__.function
raise =
if Enum.count_until(patterns, 2) == 2 do
pattern_string =
Enum.map_join(patterns, "\n", fn pattern ->
"* " <> Macro.to_string(pattern)
end)
quote do
raise Ash.Error.Framework.InvalidReturnType,
message: """
Invalid value returned from `#{inspect(unquote(module))}.#{unquote(function)}/#{unquote(arity - 1)}`.
The callback `#{inspect(unquote(__CALLER__.module))}.#{unquote(function)}/#{unquote(arity - 1)}` expects one of the following return types:
#{unquote(pattern_string)}
"""
end
else
quote do
raise Ash.Error.Framework.InvalidReturnType,
message: """
Invalid value returned from `#{inspect(unquote(module))}.#{unquote(function)}/#{unquote(arity - 1)}`.
The callback `#{inspect(unquote(__CALLER__.module))}.#{unquote(function)}/#{unquote(arity - 1)}` expects the following return:
#{unquote(Macro.to_string(Enum.at(patterns, 0)))}
"""
end
end
result_var = Macro.var(:result, __MODULE__)
matches =
Enum.map(patterns, fn pattern ->
{:->, [generated: true], [[pattern], result_var]}
end)
|> Enum.concat([
{:->, [generated: true], [[{:_, [generated: true], Elixir}], raise]}
])
case =
{:case, [generated: true], [result_var, [do: matches]]}
|> Macro.prewalk(fn
{x, meta, y} ->
{x, Keyword.put(meta, :generated, true), y}
other ->
other
end)
quote generated: true do
unquote(result_var) = unquote(result)
unquote(case)
end
end
end