67cca5d3a1
Surprisingly enough, by doing small cirurgical changes in the existing EMQX control scripts, we are able to get it running with Elixir and with existing functionalities (`console`, `remote_console`, `start`, `stop`, `ctl`, `foreground`, `eval`).
352 lines
13 KiB
Erlang
Executable File
352 lines
13 KiB
Erlang
Executable File
#!/usr/bin/env escript
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%% -*- mode: erlang;erlang-indent-level: 4;indent-tabs-mode: nil -*-
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%% ex: ft=erlang ts=4 sw=4 et
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%% -------------------------------------------------------------------
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%%
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%% nodetool: Helper Script for interacting with live nodes
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%%
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%% -------------------------------------------------------------------
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-mode(compile).
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main(Args) ->
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case os:type() of
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{win32, nt} -> ok;
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_nix ->
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case init:get_argument(start_epmd) of
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{ok, [["true"]]} ->
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ok = start_epmd();
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_ ->
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ok
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end
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end,
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ok = add_libs_dir(),
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case Args of
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["hocon" | Rest] ->
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%% forward the call to hocon_cli
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hocon_cli:main(Rest);
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_ ->
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do(Args)
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end.
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do(Args) ->
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ok = do_with_halt(Args, "mnesia_dir", fun create_mnesia_dir/2),
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ok = do_with_halt(Args, "chkconfig", fun("-config", X) -> chkconfig(X) end),
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ok = do_with_halt(Args, "chkconfig", fun chkconfig/1),
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Args1 = do_with_ret(Args, "-name",
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fun(TargetName) ->
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ThisNode = this_node_name(longnames, TargetName),
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{ok, _} = net_kernel:start([ThisNode, longnames]),
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put(target_node, nodename(TargetName))
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end),
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Args2 = do_with_ret(Args1, "-sname",
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fun(TargetName) ->
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ThisNode = this_node_name(shortnames, TargetName),
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{ok, _} = net_kernel:start([ThisNode, shortnames]),
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put(target_node, nodename(TargetName))
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end),
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RestArgs = do_with_ret(Args2, "-setcookie",
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fun(Cookie) ->
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erlang:set_cookie(node(), list_to_atom(Cookie))
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end),
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[application:start(App) || App <- [crypto, public_key, ssl]],
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TargetNode = get(target_node),
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%% See if the node is currently running -- if it's not, we'll bail
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case {net_kernel:hidden_connect_node(TargetNode), net_adm:ping(TargetNode)} of
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{true, pong} ->
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ok;
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{false, pong} ->
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io:format(standard_error, "Failed to connect to node ~p\n", [TargetNode]),
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halt(1);
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{_, pang} ->
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io:format(standard_error, "Node ~p not responding to pings.\n", [TargetNode]),
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halt(1)
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end,
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case RestArgs of
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["getpid"] ->
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io:format("~p\n", [list_to_integer(rpc:call(TargetNode, os, getpid, []))]);
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["ping"] ->
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%% If we got this far, the node already responsed to a ping, so just dump
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%% a "pong"
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io:format("pong\n");
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["stop"] ->
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case rpc:call(TargetNode, emqx_machine, graceful_shutdown, [], 60000) of
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ok ->
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ok;
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{badrpc, nodedown} ->
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%% nodetool commands are always executed after a ping
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%% which if the code gets here, it's because the target node
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%% has shutdown before RPC returns.
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ok
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end;
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["rpc", Module, Function | RpcArgs] ->
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case rpc:call(TargetNode, list_to_atom(Module), list_to_atom(Function),
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[RpcArgs], 60000) of
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ok ->
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ok;
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{error, cmd_not_found} ->
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halt(1);
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{error, Reason} ->
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io:format("RPC to ~s error: ~p\n", [TargetNode, Reason]),
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halt(1);
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{badrpc, Reason} ->
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io:format("RPC to ~s failed: ~p\n", [TargetNode, Reason]),
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halt(1);
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_ ->
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halt(1)
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end;
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["rpc_infinity", Module, Function | RpcArgs] ->
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case rpc:call(TargetNode, list_to_atom(Module), list_to_atom(Function), [RpcArgs], infinity) of
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ok ->
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ok;
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{badrpc, Reason} ->
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io:format("RPC to ~p failed: ~p\n", [TargetNode, Reason]),
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halt(1);
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_ ->
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halt(1)
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end;
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["rpcterms", Module, Function | ArgsAsString] ->
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case rpc:call(TargetNode, list_to_atom(Module), list_to_atom(Function),
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consult(lists:flatten(ArgsAsString)), 60000) of
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{badrpc, Reason} ->
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io:format("RPC to ~p failed: ~p\n", [TargetNode, Reason]),
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halt(1);
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Other ->
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io:format("~p\n", [Other])
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end;
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["eval" | ListOfArgs] ->
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Parsed = parse_eval_args(ListOfArgs),
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% and evaluate it on the remote node
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case rpc:call(TargetNode, erl_eval, exprs, [Parsed, [] ]) of
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{value, Value, _} ->
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io:format ("~p~n",[Value]);
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{badrpc, Reason} ->
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io:format("RPC to ~p failed: ~p~n", [TargetNode, Reason]),
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halt(1)
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end;
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["eval-elixir" | ListOfArgs] ->
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JoinedArgs = string:join(ListOfArgs, " "),
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case rpc:call(TargetNode, 'Elixir.Code', eval_string, [JoinedArgs]) of
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{Value, []} ->
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%% Since we are in Erlang land, we ask Elixir to
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%% format the result as well:
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case rpc:call(TargetNode, 'Elixir.Kernel', inspect, [Value, [{pretty, true}]]) of
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{badrpc, Reason} ->
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io:format("RPC to ~p failed: ~p~n", [TargetNode, Reason]),
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halt(1);
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PrettyStr ->
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io:format("~s~n", [PrettyStr])
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end;
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{badrpc, Reason} ->
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io:format("RPC to ~p failed: ~p~n", [TargetNode, Reason]),
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halt(1)
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end;
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Other ->
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io:format("Other: ~p~n", [Other]),
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io:format("Usage: nodetool chkconfig|getpid|ping|stop|rpc|rpc_infinity|rpcterms|eval|cold_eval [Terms] [RPC]\n")
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end,
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net_kernel:stop().
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parse_eval_args(Args) ->
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% shells may process args into more than one, and end up stripping
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% spaces, so this converts all of that to a single string to parse
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String = binary_to_list(
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list_to_binary(
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join(Args," ")
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)
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),
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% then just as a convenience to users, if they forgot a trailing
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% '.' add it for them.
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Normalized =
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case lists:reverse(String) of
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[$. | _] -> String;
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R -> lists:reverse([$. | R])
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end,
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% then scan and parse the string
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{ok, Scanned, _} = erl_scan:string(Normalized),
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{ok, Parsed } = erl_parse:parse_exprs(Scanned),
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Parsed.
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do_with_ret(Args, Name, Handler) ->
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{arity, Arity} = erlang:fun_info(Handler, arity),
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case take_args(Args, Name, Arity) of
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false ->
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Args;
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{Args1, Rest} ->
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_ = erlang:apply(Handler, Args1),
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Rest
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end.
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do_with_halt(Args, Name, Handler) ->
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{arity, Arity} = erlang:fun_info(Handler, arity),
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case take_args(Args, Name, Arity) of
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false ->
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ok;
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{Args1, _Rest} ->
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erlang:apply(Handler, Args1), %% should halt
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io:format(standard_error, "~s handler did not halt", [Name]),
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halt(?LINE)
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end.
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%% Return option args list if found, otherwise 'false'.
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take_args(Args, OptName, 0) ->
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lists:member(OptName, Args) andalso [];
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take_args(Args, OptName, OptArity) ->
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take_args(Args, OptName, OptArity, _Scanned = []).
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take_args([], _, _, _) -> false; %% no such option
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take_args([Name | Rest], Name, Arity, Scanned) ->
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length(Rest) >= Arity orelse error({not_enough_args_for, Name}),
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{Result, Tail} = lists:split(Arity, Rest),
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{Result, lists:reverse(Scanned) ++ Tail};
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take_args([Other | Rest], Name, Arity, Scanned) ->
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take_args(Rest, Name, Arity, [Other | Scanned]).
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start_epmd() ->
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[] = os:cmd("\"" ++ epmd_path() ++ "\" -daemon"),
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ok.
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epmd_path() ->
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ErtsBinDir = filename:dirname(escript:script_name()),
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Name = "epmd",
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case os:find_executable(Name, ErtsBinDir) of
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false ->
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case os:find_executable(Name) of
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false ->
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io:format("Could not find epmd.~n"),
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halt(1);
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GlobalEpmd ->
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GlobalEpmd
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end;
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Epmd ->
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Epmd
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end.
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nodename(Name) ->
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case re:split(Name, "@", [{return, list}, unicode]) of
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[_Node, _Host] ->
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list_to_atom(Name);
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[Node] ->
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[_, Host] = re:split(atom_to_list(node()), "@", [{return, list}, unicode]),
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list_to_atom(lists:concat([Node, "@", Host]))
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end.
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this_node_name(longnames, Name) ->
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[Node, Host] = re:split(Name, "@", [{return, list}, unicode]),
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list_to_atom(lists:concat(["remsh_maint_", Node, os:getpid(), "@", Host]));
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this_node_name(shortnames, Name) ->
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list_to_atom(lists:concat(["remsh_maint_", Name, os:getpid()])).
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%% For windows???
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create_mnesia_dir(DataDir, NodeName) ->
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MnesiaDir = filename:join(DataDir, NodeName),
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file:make_dir(MnesiaDir),
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io:format("~s", [MnesiaDir]),
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halt(0).
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chkconfig(File) ->
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case file:consult(File) of
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{ok, Terms} ->
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case validate(Terms) of
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ok ->
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halt(0);
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{error, Problems} ->
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lists:foreach(fun print_issue/1, Problems),
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%% halt(1) if any problems were errors
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halt(case [x || {error, _} <- Problems] of
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[] -> 0;
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_ -> 1
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end)
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end;
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{error, {Line, Mod, Term}} ->
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io:format(standard_error, ["Error on line ", file:format_error({Line, Mod, Term}), "\n"], []),
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halt(1);
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{error, Error} ->
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io:format(standard_error, ["Error reading config file: ", File, " ", file:format_error(Error), "\n"], []),
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halt(1)
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end.
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%%
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%% Given a string or binary, parse it into a list of terms, ala file:consult/0
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%%
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consult(Str) when is_list(Str) ->
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consult([], Str, []);
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consult(Bin) when is_binary(Bin)->
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consult([], binary_to_list(Bin), []).
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consult(Cont, Str, Acc) ->
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case erl_scan:tokens(Cont, Str, 0) of
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{done, Result, Remaining} ->
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case Result of
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{ok, Tokens, _} ->
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{ok, Term} = erl_parse:parse_term(Tokens),
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consult([], Remaining, [Term | Acc]);
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{eof, _Other} ->
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lists:reverse(Acc);
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{error, Info, _} ->
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{error, Info}
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end;
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{more, Cont1} ->
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consult(Cont1, eof, Acc)
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end.
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%%
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%% Validation functions for checking the app.config
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%%
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validate([Terms]) ->
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Results = [ValidateFun(Terms) || ValidateFun <- get_validation_funs()],
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Failures = [Res || Res <- Results, Res /= true],
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case Failures of
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[] ->
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ok;
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_ ->
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{error, Failures}
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end.
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%% Some initial and basic checks for the app.config file
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get_validation_funs() ->
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[ ].
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print_issue({warning, Warning}) ->
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io:format(standard_error, "Warning in app.config: ~s~n", [Warning]);
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print_issue({error, Error}) ->
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io:format(standard_error, "Error in app.config: ~s~n", [Error]).
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%% string:join/2 copy; string:join/2 is getting obsoleted
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%% and replaced by lists:join/2, but lists:join/2 is too new
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%% for version support (only appeared in 19.0) so it cannot be
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%% used. Instead we just adopt join/2 locally and hope it works
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%% for most unicode use cases anyway.
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join([], Sep) when is_list(Sep) ->
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[];
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join([H|T], Sep) ->
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H ++ lists:append([Sep ++ X || X <- T]).
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add_libs_dir() ->
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[_ | _] = RootDir = os:getenv("RUNNER_ROOT_DIR"),
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CurrentVsn = os:getenv("REL_VSN"),
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RelFile = filename:join([RootDir, "releases", "RELEASES"]),
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case file:consult(RelFile) of
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{ok, [Releases]} ->
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Release = lists:keyfind(CurrentVsn, 3, Releases),
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{release, _Name, _AppVsn, _ErtsVsn, Libs, _State} = Release,
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lists:foreach(
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fun({Name, Vsn, _}) ->
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add_lib_dir(RootDir, Name, Vsn)
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end, Libs);
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{error, Reason} ->
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%% rel file was been deleted by release handler
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error({failed_to_read_RELEASES_file, RelFile, Reason})
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end.
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add_lib_dir(RootDir, Name, Vsn) ->
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LibDir = filename:join([RootDir, lib, atom_to_list(Name) ++ "-" ++ Vsn, ebin]),
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case code:add_patha(LibDir) of
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true -> ok;
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{error, _} -> error(LibDir)
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end.
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