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cowboy-trails

Cowboy routes on steroids!

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For questions or general comments regarding the use of this library, please use our public hipchat room.

If you find any bugs or have a problem while using this library, please open an issue in this repo (or a pull request :)).

And you can check all of our open-source projects at inaka.github.io.

Why Cowboy Trails?

Cowboy-Trails enables you to:

  • Add information to cowboy routes, which can be used later to interact with the server in a higher abstraction level.

  • Define the server routes directly within the module that implements them.

How to Use it?

The first use case for cowboy_trails is to compile cowboy routes.

Normally with cowboy you compile routes in the following way:

Routes = [{'_',
           [ {"/resource1", resource1_handler, []}
           , {"/resource2/[:id]", resource2_handler, []}
           ]
          }
         ],
cowboy_router:compile(Routes),

Trails is also fully compatible with cowboy routes, so you can pass the same routes in order to be processed by trails:

trails:compile(Routes),

So far it seems like there is not any difference, right? But the most common case with cowboy is that you usually work with a single host, even though you're required to keep defining the host parameter within the routes ([{'_', [...]}]).

Well, with trails you have another useful function to compile single host routes:

%% You only define the routes/paths
Routes = [ {"/resource1", resource1_handler, []}
         , {"/resource2/[:id]", resource2_handler, []}
         ],
trails:single_host_compile(Routes),

Now, let's suppose that you want to add additional information (metadata) to cowboy routes related with the semantics of each HTTP method.

Metadata = #{put => #{description => "PUT method"},
             post => #{ description => "POST method"},
             get => #{ description => "GET method"}},
Trail = trails:trail("/",
                     cowboy_static,
                     {private_file, "index2.html"},
                     Metadata,
                     []),
%% You can later retrieve the metadata:
Metadata = trails:metadata(Trail),

This can be used later to generate documentation related to each endpoint.

Normally, when you work with cowboy you have to define all routes in one place:

Routes =
  [{'_',
    [ {"/", cowboy_static, {file, "www/index.html"}}
    , {"/favicon.ico", cowboy_static, {file, "www/assets/favicon.ico"}}
    , {"/assets/[...]", cowboy_static, {dir, "www/assets"}}
    , {"/game/:game_id", cowboy_static, {file, "www/game.html"}}
    , {"/api/status", spts_status_handler,  []}
    , {"/api/games", spts_games_handler, []}
    , {"/api/games/:game_id", spts_single_game_handler, []}
    , {"/api/games/:game_id/serpents", spts_serpents_handler, []}
    , { "/api/games/:game_id/serpents/:token"
      , spts_single_serpent_handler, []
      }
    , {"/api/games/:game_id/news", lasse_handler, [spts_news_handler]}
    ]
   }
  ],
Dispatch = cowboy_router:compile(Routes),

But now with trails you're able to define the routes on each resource handler. The handler must implement the callback trails/0 and return the specific routes for that handler. For a better understanding, you can check out the examples in the test folder (trails_test_handler).

Once you have implemented the trails/0 callback on your handlers, you can do something like this:

Handlers =
  [ spts_status_handler
  , spts_games_handler
  , spts_single_game_handler
  , spts_serpents_handler
  , spts_single_serpent_handler
  , spts_news_handler
  ],
Trails =
  [ {"/", cowboy_static, {file, "www/index.html"}}
  , {"/favicon.ico", cowboy_static, {file, "www/assets/favicon.ico"}}
  , {"/assets/[...]", cowboy_static, {dir, "www/assets"}}
  , {"/game/:game_id", cowboy_static, {file, "www/game.html"}}
  | trails:trails(Handlers)
  ],
trails:single_host_compile(Trails),

This way each handler keeps their own routes, as it should be, and you can merge them easily.

Example

For more information about cowboy_trails, how to use it and the different functions that it exposes, please check this Example.

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