Cowboy的使用

1. 使用rebar3创建erlang项目

   rebar3 new app test_cowboy
   

2. 修改rebar.config

   {plugins, [
       {rebar3_run, {git, "git://github.com/tsloughter/rebar3_run.git", {branch, "master"}}}
   ]}.
   {erl_opts, [debug_info]}.
   {deps, [
           {cowboy, {git, "git://github.com/extend/cowboy.git",{tag, "1.0.0"}}}
   ]}.
   {relx, [{release, {test_cowboy, "1.0.0"}, [test_cowboy]},
           {dev_mode, false},
           {include_erts, true},
           {system_libs, true},
           {include_src, false},
           {sys_config, "conf/sys.config"},
           {vm_args, "conf/vm.args"},
           {extended_start_script, true}
   ]}.
   

3. 创建conf文件夹

   mkdir conf && cd conf
   

4. 在conf下创建vm.args和sys.config文件

   • vm.args

     ## Name of the node
     -name test_cowboy@127.0.0.1
     ## Cookie for distributed erlang
     -setcookie shadowolf
     

   • sys.config

     [].
     

5. 修改src/test_cowboy.app.src

   {application, test_cowboy,
   [{description, "Hello Erlang"},
       {vsn, "0.1.0"},
       {registered, []},
       {mod, { test_cowboy_app, []}},
       {applications,
           [   kernel,
               stdlib,
               cowboy
           ]},
       {env,[]},
       {modules, []}
   ]}.
   

6. 修改src/test_cowboy_sup.erl

   -module(test_cowboy_sup).
   -behaviour(supervisor).
   -export([start_link/0]).
   -export([init/1]).
   -define(CHILD(I, Type), {I, {I, start_link, []}, permanent, 5000, Type, [I]}).
   -define(SERVER, ?MODULE).
   start_link() ->
           supervisor:start_link({local, ?SERVER}, ?MODULE, []).
   init([]) ->
           {ok, { {one_for_all, 0, 1}, [?CHILD(test_cowboy_web_svr, worker)]} }.
   

7. 新建src/test_cowboy_web_svr.erl文件

   -module(test_cowboy_web_svr).
   -author("zhangpeng"). -behaviour(gen_server).
   -export([start_link/0]).
   -export([init/1,
       handle_call/3,
       handle_cast/2,
       handle_info/2,
       terminate/2,
       code_change/3]).
   -define(SERVER, ?MODULE).
   -record(state, {}).
   start_link() ->
       gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
   init([]) ->
       Dispatch = cowboy_router:compile(
           [
               {'_',
                   [
                       {"/test_cowboy_1", test_cowboy_1, []}
                   ]
               }
           ]
       ),
       NbAcceptorts = 100,
       MaxConn = 1024 ,
       Port = 8003,
       {ok, _} = cowboy:start_http(test_cowboy_http, NbAcceptorts,
       [{port, Port},
       {max_connections, MaxConn}],
       [{env, [{dispatch, Dispatch}]}]),
       {ok, #state{}}.
   handle_call(_Request, _From, State) ->
       {reply, ok, State}.
   handle_cast(_Request, State) ->
       {noreply, State}.
   handle_info(_Info, State) ->
       {noreply, State}.
   terminate(_Reason, _State) ->
       ok.
   code_change(_OldVsn, State, _Extra) ->
       {ok, State}.
   

8. 新建src/test_cowboy_1.erl

   -module(test_cowboy_1).
   -author("zhangpeng").
   -behaviour(cowboy_http_handler).
   -export([init/3]).
   -export([handle/2]).
   -export([terminate/3]).
   init(_, Req, _Opts) ->
       {ok, Req, undefined}.
   handle(Req, State) ->
       {Param1,Req1} = cowboy_req:qs_val(<<"param1">>,Req),
       {Param2,Req2} = cowboy_req:qs_val(<<"param2">>,Req1),
       {ok, ReqReturn} = cowboy_req:reply(200, [{<<"content-type">>, <<"text/plain">>}], <<"Hello Erlang!">>, Req2),
       {ok, ReqReturn, State}.
   terminate(_Reason, _Req, _State) ->
       ok.
   

来源：oschina

链接：https://my.oschina.net/u/3142084/blog/1593767