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diff --git a/lib/tesla/middleware/fuse.ex b/lib/tesla/middleware/fuse.ex
index e2ca954..7eae8f8 100644
--- a/lib/tesla/middleware/fuse.ex
+++ b/lib/tesla/middleware/fuse.ex
@@ -1,52 +1,54 @@
-defmodule Tesla.Middleware.Fuse do
- @moduledoc """
- Fuse (https://github.com/jlouis/fuse) middleware
+if Code.ensure_loaded?(:fuse) do
+ defmodule Tesla.Middleware.Fuse do
+ @moduledoc """
+ Fuse (https://github.com/jlouis/fuse) middleware
- Remember to add `{:fuse, "~> 2.4"}` to dependencies
- and `:fuse` to applications in `mix.exs`
+ Remember to add `{:fuse, "~> 2.4"}` to dependencies
+ and `:fuse` to applications in `mix.exs`
- Example
- defmodule Myclient do
- use Tesla
+ Example
+ defmodule Myclient do
+ use Tesla
- plug Tesla.Middleware.Fuse, opts: {{:standard, 2, 10_000}, {:reset, 60_000}}
- end
+ plug Tesla.Middleware.Fuse, opts: {{:standard, 2, 10_000}, {:reset, 60_000}}
+ end
- Options:
- - `:name` - fuse name (defaults to module name)
- - `:opts` - fuse options (see fuse docs for reference)
- """
+ Options:
+ - `:name` - fuse name (defaults to module name)
+ - `:opts` - fuse options (see fuse docs for reference)
+ """
- # options borrowed from http://blog.rokkincat.com/circuit-breakers-in-elixir/
- # most probably not valid for your use case
- @defaults {{:standard, 2, 10_000}, {:reset, 60_000}}
+ # options borrowed from http://blog.rokkincat.com/circuit-breakers-in-elixir/
+ # most probably not valid for your use case
+ @defaults {{:standard, 2, 10_000}, {:reset, 60_000}}
- def call(env, next, opts) do
- opts = opts || []
- name = Keyword.get(opts, :name, env.__module__)
+ def call(env, next, opts) do
+ opts = opts || []
+ name = Keyword.get(opts, :name, env.__module__)
- case :fuse.ask(name, :sync) do
- :ok ->
- run(env, next, name)
+ case :fuse.ask(name, :sync) do
+ :ok ->
+ run(env, next, name)
- :blown ->
- {:error, :unavailable}
+ :blown ->
+ {:error, :unavailable}
- {:error, :not_found} ->
- :fuse.install(name, Keyword.get(opts, :opts, @defaults))
- run(env, next, name)
+ {:error, :not_found} ->
+ :fuse.install(name, Keyword.get(opts, :opts, @defaults))
+ run(env, next, name)
+ end
end
- end
- defp run(env, next, name) do
- try do
- Tesla.run(env, next)
- rescue
- _error ->
- :fuse.melt(name)
- {:error, :unavailable}
+ defp run(env, next, name) do
+ try do
+ Tesla.run(env, next)
+ rescue
+ _error ->
+ :fuse.melt(name)
+ {:error, :unavailable}
+ end
end
end
end

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