Erlang依賴未啓動錯誤

Question

我想運行一個啓動腳本，但最終出現以下錯誤。

{"init terminating in do_boot",{{case_clause,{error,{not_started,ranch}}},[{egs,ensure_started,1,[{file,"src/egs.erl"},{line,84}]},{egs,start,0,[{file,"src/egs.erl"},{line,49}]},{init,start_it,1,[]},{init,start_em,1,[]}]}} 

我可以編譯具有多個依賴項的整個文件夾，這是唯一一個有錯誤的文件夾。我使用'make'進行編譯，它應該是'make run'來運行，但這不起作用。這是爲什麼我得到這個錯誤？任何想法如何解決它將不勝感激。

我得到錯誤的文件位於下方。

-module(egs). 
-export([start/0, stop/0, global/1, warp/4, warp/5]). %% API. 

%% Player and account-related types. 

-type gid() :: 0..16#ffffffff. 
-type lid() :: 0..1023 | 16#ffff. 
-type character_slot() :: 0..3. 
-export_type([gid/0, lid/0, character_slot/0]). 

%% Location related types. 

-type uniid() :: 21 | 26..254 | 16#ffffffff. 
-type questid() :: 0..16#ffffffff. %% @todo What's the real max? 
-type zoneid() :: 0..16#ffff. %% @todo What's the real max? 
-type mapid() :: 0..9999. 
-type entryid() :: 0..16#ffff. %% @todo What's the real max? 
-type area() :: {questid(), zoneid(), mapid()}. %% @todo Probably remove later. 
-type position() :: {X::float(), Y::float(), Z::float(), Dir::float()}. 
-export_type([uniid/0, questid/0, zoneid/0, mapid/0, entryid/0, 
area/0, position/0]). 

%% API. 

-spec start() -> ok. 
start() -> 
ensure_started(crypto), 
ensure_started(public_key), 
ensure_started(ssl), 
ensure_started(cowboy), 
ensure_started(ranch), 
application:start(egs). 

-spec stop() -> ok. 
stop() -> 
Res = application:stop(egs), 
ok = application:stop(cowboy), 
ok = application:stop(ranch), 
ok = application:stop(ssl), 
ok = application:stop(public_key), 
ok = application:stop(crypto), 
Res. 

%% @doc Send a global message. 
-spec global(string()) -> ok. 
global(Message) when length(Message) > 511 -> 
io:format("global: message too long~n"); 
global(Message) -> 
egs_users:broadcast_all({egs, notice, top, Message}). 

%% @doc Warp all players to a new map. 
-spec warp(questid(), zoneid(), mapid(), entryid()) -> ok. 
warp(QuestID, ZoneID, MapID, EntryID) -> 
egs_users:broadcast_all({egs, warp, QuestID, ZoneID, MapID, EntryID}). 

%% @doc Warp one player to a new map. 
-spec warp(gid(), questid(), zoneid(), mapid(), entryid()) -> ok. 
warp(GID, QuestID, ZoneID, MapID, EntryID) -> 
egs_users:broadcast({egs, warp, QuestID, ZoneID, MapID, EntryID}, [GID]). 

%% Internal. 

-spec ensure_started(module()) -> ok. 
ensure_started(App) -> 
case application:start(App) of 
ok -> ok; 
{error, {already_started, App}} -> ok 
end. 

Answer 1

應用程序啓動順序很重要。特別是，cowboy取決於ranch和crypto。另外，public_key取決於crypto，必須在ssl之前啓動。正確的啓動順序是：

ok = application:start(crypto), 
ok = application:start(public_key), 
ok = application:start(ssl), 
ok = application:start(ranch), 
ok = application:start(cowboy), 
ok = application:start(egs). 

對於鋼筋構建的應用程序，啓動依賴性在[app]/src/[app].app.src上市。請參閱LYSE chapter。

它沒有開箱即用的原因可能是EGS依賴於Cowboy的主分支，它最近引入了Ranch作爲依賴。