Webmachine for Zotonic and Cowboy
This is an adaptation of https://github.com/webmachine/webmachine for the Cowboy web server.
Cowmachine is a request handler for Cowboy.
Main differences with Basho’s Webmachine are:
- Use cowboy instead of mochiweb for the http server
- Separate dispatching
- Simplified callbacks
- Single
process/4callback for all http methods - Caching of some callbacks (like
modified) - More streaming options for returned data
- Better support for range requests
Cowmachine is at Hex, in your rebar.config file use:
{deps, [
cowmachine
]}.You can also use the direct Git url and use the development version:
{deps, [
{cowmachine, {git, "https://github.com/zotonic/cowmachine.git", {branch, "master"}}}
]}.Cowmachine can be called from your Cowboy middleware:
-spec execute(Req, Env) -> {ok, Req, Env} | {stop, Req}
when Req::cowboy_req:req(), Env::cowboy_middleware:env().
execute(Req, Env) ->
% Replace below with your own controller module and optionally wrap
% the request in your own request-context record or map.
EnvController = Env#{
cowmachine_controller => mycontroller
},
RequestContext = cowmachine_req:init_context(Req, EnvController, #{}),
% Set options for the cowmachine
Options = #{
on_request =>
fun(Ctx) ->
% Perform anything after initialization of your request
% Examples are checking special cookies, changing headers, etc.
Ctx
end,
on_welformed =>
fun(Ctx) ->
% Perform anything after well-formedness check of your request
% Examples are parsing the query args, or authentication
Ctx
end,
on_handled =>
fun(Ctx) ->
% Perform anything after processing, before sending the result.
Ctx
end
},
% Handle the request, returns updated Req and Env for next Cowboy middleware
cowmachine:request(RequestContext, Options).Or just use the default Cowmachine middleware:
#{
middlewares => [
% ... add your dispatcher middlware
cowmachine
],
request_timeout => 60000,
env => #{
% If no dispatcher, default to `mycontroller` as the cowmachine
% controller.
cowmachine_controller => mycontroller
}
}.You can use the Zotonic Dispatch Compiler to match your controller paths against the request.
The controller provides the callbacks to handle the request.
The controller is an Erlang module implementing callback functions, only functions that return some non-default value need to be implemented.
For the controller callbacks and more documentation, check the wiki pages.
rebar3 edoc
rebar3 as edoc_private edoc
rebar3 ex_doc --logo doc/img/logo.png --output edoc -f html
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent