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diff --git a/lib/tesla/middleware/decode_rels.ex b/lib/tesla/middleware/decode_rels.ex
index ad55cc3..1385fc5 100644
--- a/lib/tesla/middleware/decode_rels.ex
+++ b/lib/tesla/middleware/decode_rels.ex
@@ -1,49 +1,51 @@
defmodule Tesla.Middleware.DecodeRels do
@behaviour Tesla.Middleware
@moduledoc """
Decode `Link` Hypermedia HTTP header into `opts[:rels]` field in response.
### Example usage
```
defmodule MyClient do
use Tesla
plug Tesla.Middleware.DecodeRels
end
env = MyClient.get("/...")
env.opts[:rels] # => %{"Next" => "http://...", "Prev" => "..."}
```
"""
def call(env, next, _opts) do
env
|> Tesla.run(next)
|> parse_rels
end
+ defp parse_rels({:ok, env}), do: {:ok, parse_rels(env)}
+ defp parse_rels({:error, reason}), do: {:error, reason}
defp parse_rels(env) do
if link = Tesla.get_header(env, "link") do
Tesla.put_opt(env, :rels, rels(link))
else
env
end
end
defp rels(link) do
link
|> String.split(",")
|> Enum.map(&String.trim/1)
|> Enum.map(&rel/1)
|> Enum.into(%{})
end
defp rel(item) do
Regex.run(~r/\A<(.+)>; rel="(.+)"\z/, item, capture: :all_but_first)
|> Enum.reverse()
|> List.to_tuple()
end
end
diff --git a/test/tesla/middleware/decode_rels_test.exs b/test/tesla/middleware/decode_rels_test.exs
index 7e9c17d..603a38c 100644
--- a/test/tesla/middleware/decode_rels_test.exs
+++ b/test/tesla/middleware/decode_rels_test.exs
@@ -1,37 +1,37 @@
defmodule Tesla.Middleware.DecodeRelsTest do
use ExUnit.Case
defmodule Client do
use Tesla
plug Tesla.Middleware.DecodeRels
adapter fn env ->
- case env.url do
+ {:ok, case env.url do
"/rels" ->
Tesla.put_headers(env, [
{"link", ~s(<https://api.github.com/resource?page=2>; rel="next",
<https://api.github.com/resource?page=5>; rel="last")}
])
_ ->
env
- end
+ end}
end
end
test "deocde rels" do
- env = Client.get("/rels")
+ assert {:ok, env} = Client.get("/rels")
assert env.opts[:rels] == %{
"next" => "https://api.github.com/resource?page=2",
"last" => "https://api.github.com/resource?page=5"
}
end
test "skip if no Link header" do
- env = Client.get("/")
+ assert {:ok, env} = Client.get("/")
assert env.opts[:rels] == nil
end
end

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