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rambla
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Easy publishing to many different targets. Supported back-ends: - Rabbit [Amqp](https://hexdocs.pm/amqp/) - Redis [Redix](https://hexdocs.pm/redix) - Http [:httpc](http://erlang.org/doc/man/httpc.html) - Smtp [:gen_smtp](https://hexdocs.pm/gen_smtp) - Slack [Envío](https://hexdocs.pm/envio)
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lib/rambla/exception.ex
defmodule Rambla.Exception do
@moduledoc """
Base type for all the `Rambla` exceptions.
"""
@typedoc """
`Rambla` exception contains:
- `reason` the string describing the error in human-readable form
- `source` usually the type/action this error is originated from
- `info` free-style map containig additional information (not displayed by default)
"""
@type t :: %{
reason: any(),
source: atom(),
cause: Rambla.Exception.t() | nil
}
defmacro __using__(_opts \\ []) do
quote location: :keep do
@moduledoc false
defexception [:reason, :source, :info, :expected]
@impl true
def message(%__MODULE__{reason: reason, source: source, expected: expected}),
do: "✗ " <> inspect(source) <> ": " <> reason <> " (expected: #{expected})"
@impl true
def exception(opts) do
source = Keyword.get(opts, :source, "🤷")
reason = Keyword.get(opts, :reason, "Unexpected error (blame AM)")
info = Keyword.get(opts, :info, %{})
%__MODULE__{reason: reason, source: source, info: info}
end
defimpl Inspect do
def inspect(%type{} = data, opts), do: type.message(data)
end
end
end
@doc false
@spec reduce(exs :: [Rambla.Exception.t()]) :: binary()
def reduce(exs) do
exs
|> Enum.reverse()
|> Enum.map_join("\n", & &1.message)
end
end
defmodule Rambla.Exceptions.Connection do
@moduledoc """
The instance of generic `Rambla.Exception`, to be raised/created
when some connection issues happen.
"""
use Rambla.Exception
end
defmodule Rambla.Exceptions.Unknown do
@moduledoc """
The instance of generic `Rambla.Exception`, has no specific behaviour.
This module is introduced to simplify pattern matching / distinguishing between
different types of exceptions.
Basically, `Rambla.Exception.Unknown` is raised during compile-time,
`Rambla.Exception.Connection` is an exception caused by connection issues, etc.
"""
use Rambla.Exception
end