mirror of
https://github.com/correl/rebar.git
synced 2024-11-27 19:19:53 +00:00
138 lines
4.7 KiB
Erlang
138 lines
4.7 KiB
Erlang
%% -*- 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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main(Args) ->
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ok = start_epmd(),
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%% Extract the args
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{RestArgs, TargetNode} = process_args(Args, [], undefined),
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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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{_, pang} ->
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io:format("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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["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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io:format("~p\n", [rpc:call(TargetNode, init, stop, [], 60000)]);
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["restart"] ->
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io:format("~p\n", [rpc:call(TargetNode, init, restart, [], 60000)]);
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["reboot"] ->
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io:format("~p\n", [rpc:call(TargetNode, init, reboot, [], 60000)]);
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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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{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(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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Other ->
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io:format("Other: ~p\n", [Other]),
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io:format("Usage: nodetool {ping|stop|restart|reboot}\n")
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end,
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net_kernel:stop().
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process_args([], Acc, TargetNode) ->
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{lists:reverse(Acc), TargetNode};
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process_args(["-setcookie", Cookie | Rest], Acc, TargetNode) ->
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erlang:set_cookie(node(), list_to_atom(Cookie)),
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process_args(Rest, Acc, TargetNode);
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process_args(["-name", TargetName | Rest], Acc, _) ->
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ThisNode = append_node_suffix(TargetName, "_maint_"),
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{ok, _} = net_kernel:start([ThisNode, longnames]),
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process_args(Rest, Acc, nodename(TargetName));
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process_args(["-sname", TargetName | Rest], Acc, _) ->
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ThisNode = append_node_suffix(TargetName, "_maint_"),
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{ok, _} = net_kernel:start([ThisNode, shortnames]),
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process_args(Rest, Acc, nodename(TargetName));
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process_args([Arg | Rest], Acc, Opts) ->
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process_args(Rest, [Arg | Acc], Opts).
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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 string:tokens(Name, "@") 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] = string:tokens(atom_to_list(node()), "@"),
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list_to_atom(lists:concat([Node, "@", Host]))
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end.
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append_node_suffix(Name, Suffix) ->
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case string:tokens(Name, "@") of
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[Node, Host] ->
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list_to_atom(lists:concat([Node, Suffix, os:getpid(), "@", Host]));
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[Node] ->
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list_to_atom(lists:concat([Node, Suffix, os:getpid()]))
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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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