Zvex.Error (zvex v0.4.0)

Splode error hierarchy for Zvex.

Maps zvec C error codes to structured Elixir errors. Every error is a standard Elixir exception and belongs to one of six classes:

Class	Errors	Meaning
`:invalid`	`Argument`, `FailedPrecondition`	Bad input or unmet precondition
`:not_found`	`NotFound`	Requested resource does not exist
`:conflict`	`AlreadyExists`	Resource already exists
`:unavailable`	`PermissionDenied`, `ResourceExhausted`, `Unavailable`, `NotSupported`	Temporary or permanent inability to perform the operation
`:internal`	`InternalError`	Unexpected error in the native layer
`:unknown`	`Unknown`	Unclassified error

All errors carry a human-readable :message field.

Summary

Types

class()

class_module()

error_class()

t()

Functions

from_native(arg1)

Translates a NIF return value into a Splode error or passthrough.

splode_error?(arg1, splode)

traverse_errors(error_or_errors, fun)

Traverses errors, calling fun for each leaf error, and returns a nested map of results grouped by each error's path.

unwrap!(result, opts \\ nil)

Raises an error if the result is an error, otherwise returns the result

Types

class()

@type class() :: %{
  :__struct__ => class_module(),
  :__exception__ => true,
  :errors => [t()],
  :class => error_class(),
  :bread_crumbs => [String.t()],
  :vars => Keyword.t(),
  :stacktrace => Splode.Stacktrace.t() | nil,
  :context => map(),
  optional(atom()) => any()
}

class_module()

@type class_module() ::
  Zvex.Error.Unknown
  | Zvex.Error.Internal
  | Zvex.Error.Unavailable
  | Zvex.Error.Conflict
  | Zvex.Error.NotFound
  | Zvex.Error.Invalid

error_class()

@type error_class() ::
  :unknown | :internal | :unavailable | :conflict | :not_found | :invalid

t()

@type t() :: %{
  :__struct__ => module(),
  :__exception__ => true,
  :class => error_class(),
  :bread_crumbs => [String.t()],
  :vars => Keyword.t(),
  :stacktrace => Splode.Stacktrace.t() | nil,
  :context => map(),
  optional(atom()) => any()
}

Functions

from_native(arg1)

Translates a NIF return value into a Splode error or passthrough.

Accepts:

:ok -> :ok
{:ok, value} -> {:ok, value}
{:error, {code_atom, message_binary}} -> {:error, %SplodeError{}}

splode_error?(arg1, splode)

traverse_errors(error_or_errors, fun)

Traverses errors, calling fun for each leaf error, and returns a nested map of results grouped by each error's path.

See Splode.traverse_errors/2 for full documentation.

Example

iex> Elixir.Zvex.Error.traverse_errors(error, fn error ->
...>   Exception.message(error)
...> end)
%{name: ["name is required"]}

unwrap!(result, opts \\ nil)

Raises an error if the result is an error, otherwise returns the result

Alternatively, you can use the defsplode macro, which does this automatically.

Options

:error_opts - Options to pass to to_error/2 when converting the returned error
:unknown_error_opts - Options to pass to the unknown error if the function returns only :error. not necessary if your function always returns {:error, error}.

Examples

def function(arg) do

case do_something(arg) do
  :success -> :ok
  {:success, result} -> {:ok, result}
  {:error, error} -> {:error, error}
end

end

def function!(arg) do

YourErrors.unwrap!(function(arg))

end