带有cowboy 2.0.0的Erlang简单版本不起作用
我使用的是Erlang/OTP20.0和rebar3。当我启动使用cowboy 2.0.0的新版本时,该版本无法启动 以下是我构建项目的步骤。怎么了带有cowboy 2.0.0的Erlang简单版本不起作用,erlang,cowboy,rebar3,Erlang,Cowboy,Rebar3,我使用的是Erlang/OTP20.0和rebar3。当我启动使用cowboy 2.0.0的新版本时,该版本无法启动 以下是我构建项目的步骤。怎么了 创建发布项目 $ rebar3 new release cowboy2 添加牛仔套装 {deps, [{cowboy, {git, "https://github.com/ninenines/cowboy.git", {tag, "2.0.0"}}}]}. 添加一个基本的调度器 start(_StartType, _StartArgs) -
$ rebar3 new release cowboy2
{deps, [{cowboy, {git, "https://github.com/ninenines/cowboy.git", {tag, "2.0.0"}}}]}.
start(_StartType, _StartArgs) ->
Dispatch = cowboy_router:compile([
{'_', [
{"/", toppage_handler, []}
]}
]),
{ok, _} = cowboy:start_clear(http, [{port, 8080}], #{
env => #{dispatch => Dispatch}
}),
cowboy2_sup:start_link().
$ rebar3 compile && rebar3 release
$ ./_build/default/rel/cowboy2/bin/cowboy2-0.1.0 console
正如@maze le指出的,问题在于cowboy应用程序没有启动。解决方案是将牛仔添加到文件
apps/cowboy2/src/cowboy2.app.src
,该文件也是由命令$rebar3 new release cowboy2
生成的。为了完整起见,我添加了这个文件
apps/cowboy2/src/cowboy2.app.src
我不完全确定《牛仔2》的情况如何,但在《牛仔1》中,为了使用牛仔例程、路由器、调度程序等,您必须在主进程内手动启动牛仔应用程序。我刚才举了一个牛仔的小例子来提醒我类似的事情。这基本上没有记录在案。看一看,这就是错误的原因。我没有将牛仔应用程序放在cowboy2.app.src中。
$ ./_build/default/rel/cowboy2/bin/cowboy2-0.1.0 console
Exec: /home/deimos/.asdf/installs/erlang/20.0/lib/erlang/erts-9.0/bin/erlexec
-boot /home/deimos/Dev/personal/cowboy2/_build/default/rel/cowboy2/releases/0.1.0/cowboy2
-mode embedded -boot_var ERTS_LIB_DIR /home/deimos/.asdf/installs/erlang/20.0/lib/erlang/lib
-config /home/deimos/Dev/personal/cowboy2/_build/default/rel/cowboy2/releases/0.1.0/sys.config
-args_file /home/deimos/Dev/personal/cowboy2/_build/default/rel/cowboy2/releases/0.1.0/vm.args
-pa -- console
Root: /home/deimos/Dev/personal/cowboy2/_build/default/rel/cowboy2
/home/deimos/Dev/personal/cowboy2/_build/default/rel/cowboy2
Erlang/OTP 20 [erts-9.0] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:30] [hipe] [kernel-poll:true]
=INFO REPORT==== 11-Oct-2017::21:00:52 ===
application: cowboy2
exited: {bad_return,
{{cowboy2_app,start,[normal,[]]},
{'EXIT',
{undef,
[{cowboy_router,compile,
[[{'_',[{"/",toppage_handler,[]}]}]],
[]},
{cowboy2_app,start,2,
[{file,
"/home/deimos/Dev/personal/cowboy2/_build/default/lib/cowboy2/src/cowboy2_app.erl"},
{line,18}]},
{application_master,start_it_old,4,
[{file,"application_master.erl"},
{line,273}]}]}}}}
type: permanent
(...)
Kernel pid terminated (application_controller)
({application_start_failure,cowboy2,{bad_return,{{cowboy2_app,start,[normal,[]]},{'EXIT',{undef,[{cowboy_router,compile,[[{'_',[{"/",toppage_handler,[]}]
Crash dump is being written to: erl_crash.dump...done
{application, cowboy2,
[{description, "An OTP application"},
{vsn, "0.1.0"},
{registered, []},
{mod, { cowboy2_app, []}},
{applications,
[kernel,
stdlib,
cowboy
]},
{env,[]},
{modules, []},
{maintainers, []},
{licenses, ["Apache 2.0"]},
{links, []}
]}.