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diff --git a/lib/tesla/middleware/fuse.ex b/lib/tesla/middleware/fuse.ex
index 7f053f7..4128d14 100644
--- a/lib/tesla/middleware/fuse.ex
+++ b/lib/tesla/middleware/fuse.ex
@@ -1,61 +1,61 @@
if Code.ensure_loaded?(:fuse) do
defmodule Tesla.Middleware.Fuse do
@behaviour Tesla.Middleware
@moduledoc """
Circuit Breaker middleware using [fuse](https://github.com/jlouis/fuse)
Remember to add `{:fuse, "~> 2.4"}` to dependencies (and `:fuse` to applications in `mix.exs`)
Also, you need to recompile tesla after adding `:fuse` dependency:
```
mix deps.clean tesla
mix deps.compile tesla
```
### Example usage
```
defmodule MyClient do
use Tesla
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 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__)
case :fuse.ask(name, :sync) do
:ok ->
run(env, next, name)
:blown ->
{:error, :unavailable}
{:error, :not_found} ->
:fuse.install(name, Keyword.get(opts, :opts, @defaults))
run(env, next, name)
end
end
defp run(env, next, name) do
- try do
- Tesla.run(env, next)
- rescue
- _error ->
+ case Tesla.run(env, next) do
+ {:ok, env} ->
+ {:ok, env}
+ {:error, reason} ->
:fuse.melt(name)
{:error, :unavailable}
end
end
end
end
diff --git a/test/tesla/middleware/fuse_test.exs b/test/tesla/middleware/fuse_test.exs
index 54dc45d..4816e4e 100644
--- a/test/tesla/middleware/fuse_test.exs
+++ b/test/tesla/middleware/fuse_test.exs
@@ -1,50 +1,50 @@
defmodule Tesla.Middleware.FuseTest do
use ExUnit.Case, async: false
defmodule Client do
use Tesla
plug Tesla.Middleware.Fuse
plug :report
def report(env, next) do
send(self(), :request_made)
Tesla.run(env, next)
end
adapter fn env ->
case env.url do
"/ok" ->
- env
+ {:ok, env}
"/unavailable" ->
- raise %Tesla.Error{message: "adapter error: :econnrefused}", reason: :econnrefused}
+ {:error, :econnrefused}
end
end
end
setup do
Application.ensure_all_started(:fuse)
:fuse.reset(Client)
:ok
end
test "regular endpoint" do
- assert %Tesla.Env{url: "/ok"} = Client.get("/ok")
+ assert {:ok, %Tesla.Env{url: "/ok"}} = Client.get("/ok")
end
test "unavailable endpoint" do
assert {:error, :unavailable} = Client.get("/unavailable")
assert_receive :request_made
assert {:error, :unavailable} = Client.get("/unavailable")
assert_receive :request_made
assert {:error, :unavailable} = Client.get("/unavailable")
assert_receive :request_made
assert {:error, :unavailable} = Client.get("/unavailable")
refute_receive :request_made
assert {:error, :unavailable} = Client.get("/unavailable")
refute_receive :request_made
end
end

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