/
nodetool
executable file
·240 lines (222 loc) · 8.92 KB
/
nodetool
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#!/usr/bin/env escript
%%! +fnu
%% -*- mode: erlang;erlang-indent-level: 4;indent-tabs-mode: nil -*-
%% ex: ft=erlang ts=4 sw=4 et
%% -------------------------------------------------------------------
%%
%% nodetool: Helper Script for interacting with live nodes
%%
%% -------------------------------------------------------------------
%% installed by node_package (github.com/basho/node_package)
main(Args) ->
io:setopts([{encoding, utf8}]),
ok = start_epmd(),
%% Extract the args
{RestArgs, TargetNode} = process_args(Args, [], undefined),
%% Extract the RPC timeout from process dictionary, if it's defined
RpcTimeout = case erlang:get(rpctimeout) of
undefined ->
60000;
Value ->
Value
end,
%% process_args() has side-effects (e.g. when processing "-name"),
%% so take care of app-starting business first.
[application:start(App) || App <- [crypto, public_key, ssl]],
%% any commands that don't need a running node
case RestArgs of
["chkconfig", File] ->
chkconfig(File);
["chkconfig", "-config", File|_] ->
chkconfig(File);
_ ->
ok
end,
%% See if the node is currently running -- if it's not, we'll bail
case {net_kernel:hidden_connect_node(TargetNode), net_adm:ping(TargetNode)} of
{true, pong} ->
ok;
{false, pong} ->
io:format(standard_error, "failed to connect to node ~p .\n", [TargetNode]),
halt(1);
{_, pang} ->
io:format(standard_error, "Node ~p not responding to pings.\n", [TargetNode]),
halt(1)
end,
case RestArgs of
["getpid"] ->
io:format("~p\n", [list_to_integer(rpc:call(TargetNode, os, getpid, []))]);
["ping"] ->
%% If we got this far, the node already responsed to a ping, so just dump
%% a "pong"
io:format("pong\n");
["stop"] ->
io:format("~p\n", [rpc:call(TargetNode, erlang, apply,
[fun() ->
catch error_logger:info_msg("Administrative stop\n"),
init:stop()
end, []], RpcTimeout)]);
["restart"] ->
io:format("~p\n", [rpc:call(TargetNode, erlang, apply,
[fun() ->
catch error_logger:info_msg("Administrative restart\n"),
init:restart()
end, []], RpcTimeout)]);
["reboot"] ->
io:format("~p\n", [rpc:call(TargetNode, erlang, apply,
[fun() ->
catch error_logger:info_msg("Administrative reboot\n"),
init:reboot()
end, []], RpcTimeout)]);
["rpc", Module, Function | RpcArgs] ->
case rpc:call(TargetNode, list_to_atom(Module), list_to_atom(Function),
[RpcArgs], RpcTimeout) of
ok ->
ok;
{badrpc, Reason} ->
io:format(standard_error, "RPC to ~p failed: ~p\n", [TargetNode, Reason]),
halt(1);
{error, Code} when is_integer(Code) ->
halt(Code);
{error, Code, Reason} when is_integer(Code) ->
io:format(standard_error, "ERROR: ~p\n", [Reason]),
halt(Code);
_ ->
halt(1)
end;
["rpc_infinity", Module, Function | RpcArgs] ->
case rpc:call(TargetNode, list_to_atom(Module), list_to_atom(Function), [RpcArgs], infinity) of
ok ->
ok;
{badrpc, Reason} ->
io:format(standard_error, "RPC to ~p failed: ~p\n", [TargetNode, Reason]),
halt(1);
{error, Code} when is_integer(Code) ->
halt(Code);
{error, Code, Reason} when is_integer(Code) ->
io:format(standard_error, "ERROR: ~p\n", [Reason]),
halt(Code);
_ ->
halt(1)
end;
["rpcterms", Module, Function, ArgsAsString] ->
case rpc:call(TargetNode, list_to_atom(Module), list_to_atom(Function),
consult(ArgsAsString), RpcTimeout) of
{badrpc, Reason} ->
io:format(standard_error, "RPC to ~p failed: ~p\n", [TargetNode, Reason]),
halt(1);
{error, Code} when is_integer(Code) ->
halt(Code);
{error, Code, Reason} when is_integer(Code) ->
io:format(standard_error, "ERROR: ~p\n", [Reason]),
halt(Code);
Other ->
io:format("~p\n", [Other])
end;
Other ->
io:format("Other: ~p\n", [Other]),
io:format("Usage: nodetool {ping|stop|restart|reboot|chkconfig}\n")
end,
net_kernel:stop().
process_args([], Acc, TargetNode) ->
{lists:reverse(Acc), TargetNode};
process_args(["-kernel", "net_ticktime", Value | Rest], Acc, TargetNode) ->
application:set_env(kernel, net_ticktime, list_to_integer(Value)),
process_args(Rest, Acc, TargetNode);
process_args(["-setcookie", Cookie | Rest], Acc, TargetNode) ->
erlang:set_cookie(node(), list_to_atom(Cookie)),
process_args(Rest, Acc, TargetNode);
process_args(["-name", TargetName | Rest], Acc, _) ->
ThisNode = append_node_suffix(TargetName, "_maint_"),
{ok, _} = net_kernel:start([ThisNode, longnames]),
process_args(Rest, Acc, nodename(TargetName));
process_args(["-sname", TargetName | Rest], Acc, _) ->
ThisNode = append_node_suffix(TargetName, "_maint_"),
{ok, _} = net_kernel:start([ThisNode, shortnames]),
process_args(Rest, Acc, nodename(TargetName));
process_args(["-rpctimeout", TimeoutStr | Rest], Acc, TargetNode) ->
Timeout = case TimeoutStr of
"infinity" -> infinity;
_ -> list_to_integer(TimeoutStr)
end,
erlang:put(rpctimeout, Timeout),
process_args(Rest, Acc, TargetNode);
process_args([Arg | Rest], Acc, Opts) ->
process_args(Rest, [Arg | Acc], Opts).
start_epmd() ->
case os:getenv("NO_EPMD") of
false ->
[] = os:cmd(epmd_path() ++ " -daemon"),
ok;
_ ->
ok
end.
epmd_path() ->
ErtsBinDir = filename:dirname(escript:script_name()),
Name = "epmd",
case os:find_executable(Name, ErtsBinDir) of
false ->
case os:find_executable(Name) of
false ->
io:format("Could not find epmd.~n"),
halt(1);
GlobalEpmd ->
GlobalEpmd
end;
Epmd ->
Epmd
end.
nodename(Name) ->
case string:tokens(Name, "@") of
[_Node, _Host] ->
list_to_atom(Name);
[Node] ->
[_, Host] = string:tokens(atom_to_list(node()), "@"),
list_to_atom(lists:concat([Node, "@", Host]))
end.
append_node_suffix(Name, Suffix) ->
random:seed(os:timestamp()),
case string:tokens(Name, "@") of
[Node, Host] ->
list_to_atom(lists:concat([Node, Suffix, random:uniform(1000), "@", Host]));
[Node] ->
list_to_atom(lists:concat([Node, Suffix, random:uniform(1000)]))
end.
chkconfig(File) ->
case file:consult(File) of
{ok, _} ->
io:format("ok\n"),
halt(0);
{error, {Line, Mod, Term}} ->
io:format(standard_error,
["Error on line ",
file:format_error({Line, Mod, Term}), "\n"], []),
halt(1);
{error, R} ->
io:format(standard_error,
["Error reading config file: ",
file:format_error(R), "\n"], []),
halt(1)
end.
%%
%% Given a string or binary, parse it into a list of terms, ala file:consult/0
%%
consult(Str) when is_list(Str) ->
consult([], Str, []);
consult(Bin) when is_binary(Bin)->
consult([], binary_to_list(Bin), []).
consult(Cont, Str, Acc) ->
case erl_scan:tokens(Cont, Str, 0) of
{done, Result, Remaining} ->
case Result of
{ok, Tokens, _} ->
{ok, Term} = erl_parse:parse_term(Tokens),
consult([], Remaining, [Term | Acc]);
{eof, _Other} ->
lists:reverse(Acc);
{error, Info, _} ->
{error, Info}
end;
{more, Cont1} ->
consult(Cont1, eof, Acc)
end.