emqx4.3/scripts/merge-config.escript

#!/usr/bin/env escript

%% This script reads up emqx.conf and split the sections
%% and dump sections to separate files.
%% Sections are grouped between CONFIG_SECTION_BGN and
%% CONFIG_SECTION_END pairs
%%
%% NOTE: this feature is so far not used in opensource
%% edition due to backward-compatibility reasons.

-mode(compile).
-define(APPS, ["emqx", "emqx_dashboard", "emqx_authz"]).

main(_) ->
    {ok, BaseConf} = file:read_file("apps/emqx_conf/etc/emqx_conf.conf"),

    Cfgs = get_all_cfgs("apps/"),
    Conf = [
        merge(BaseConf, Cfgs),
        io_lib:nl(),
        io_lib:nl(),
        "include emqx_enterprise.conf",
        io_lib:nl()
    ],
    ok = file:write_file("apps/emqx_conf/etc/emqx.conf.all", Conf),

    EnterpriseCfgs = get_all_cfgs("lib-ee/"),
    EnterpriseConf = merge("", EnterpriseCfgs),

    ok = file:write_file("apps/emqx_conf/etc/emqx_enterprise.conf.all", EnterpriseConf).

merge(BaseConf, Cfgs) ->
    lists:foldl(
        fun(CfgFile, Acc) ->
            case filelib:is_regular(CfgFile) of
                true ->
                    {ok, Bin1} = file:read_file(CfgFile),
                    case string:trim(Bin1, both) of
                        <<>> -> Acc;
                        Bin2 -> [Acc, io_lib:nl(), io_lib:nl(), Bin2]
                    end;
                false ->
                    Acc
            end
        end,
        BaseConf,
        Cfgs
    ).

get_all_cfgs(Root) ->
    Apps0 = filelib:wildcard("*", Root) -- ["emqx_machine", "emqx_conf"],
    Apps1 = (Apps0 -- ?APPS) ++ lists:reverse(?APPS),
    Dirs = [filename:join([Root, App]) || App <- Apps1],
    lists:foldl(fun get_cfgs/2, [], Dirs).

get_all_cfgs(Dir, Cfgs) ->
    Fun = fun(E, Acc) ->
        Path = filename:join([Dir, E]),
        get_cfgs(Path, Acc)
    end,
    lists:foldl(Fun, Cfgs, filelib:wildcard("*", Dir)).

get_cfgs(Dir, Cfgs) ->
    case filelib:is_dir(Dir) of
        false ->
            Cfgs;
        _ ->
            Files = filelib:wildcard("*", Dir),
            case lists:member("etc", Files) of
                false ->
                    try_enter_child(Dir, Files, Cfgs);
                true ->
                    EtcDir = filename:join([Dir, "etc"]),
                    %% the conf name must start with emqx
                    %% because there are some other conf, and these conf don't start with emqx
                    Confs = filelib:wildcard("emqx*.conf", EtcDir),
                    NewCfgs = [filename:join([EtcDir, Name]) || Name <- Confs],
                    try_enter_child(Dir, Files, NewCfgs ++ Cfgs)
            end
    end.

try_enter_child(Dir, Files, Cfgs) ->
    case lists:member("src", Files) of
        false ->
            Cfgs;
        true ->
            get_all_cfgs(filename:join([Dir, "src"]), Cfgs)
    end.