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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (the "License"); you may not use this file except in
%% compliance with the License. You may obtain a copy of the License
%% at http://www.mozilla.org/MPL/
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and
%% limitations under the License.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developer of the Original Code is GoPivotal, Inc.
%% Copyright (c) 2007-2014 GoPivotal, Inc. All rights reserved.
%%
-module(rabbit_nodes).
-export([names/1, diagnostics/1, make/1, parts/1, cookie_hash/0,
is_running/2, is_process_running/2,
cluster_name/0, set_cluster_name/1]).
-include_lib("kernel/include/inet.hrl").
-define(EPMD_TIMEOUT, 30000).
-define(TCP_DIAGNOSTIC_TIMEOUT, 5000).
%%----------------------------------------------------------------------------
%% Specs
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-spec(names/1 :: (string()) -> rabbit_types:ok_or_error2(
[{string(), integer()}], term())).
-spec(diagnostics/1 :: ([node()]) -> string()).
-spec(make/1 :: ({string(), string()} | string()) -> node()).
-spec(parts/1 :: (node() | string()) -> {string(), string()}).
-spec(cookie_hash/0 :: () -> string()).
-spec(is_running/2 :: (node(), atom()) -> boolean()).
-spec(is_process_running/2 :: (node(), atom()) -> boolean()).
-spec(cluster_name/0 :: () -> binary()).
-spec(set_cluster_name/1 :: (binary()) -> 'ok').
-endif.
%%----------------------------------------------------------------------------
names(Hostname) ->
Self = self(),
Ref = make_ref(),
{Pid, MRef} = spawn_monitor(
fun () -> Self ! {Ref, net_adm:names(Hostname)} end),
timer:exit_after(?EPMD_TIMEOUT, Pid, timeout),
receive
{Ref, Names} -> erlang:demonitor(MRef, [flush]),
Names;
{'DOWN', MRef, process, Pid, Reason} -> {error, Reason}
end.
diagnostics(Nodes) ->
NodeDiags = [{"~nDIAGNOSTICS~n===========~n~n"
"attempted to contact: ~p~n", [Nodes]}] ++
[diagnostics_node(Node) || Node <- Nodes] ++
current_node_details(),
rabbit_misc:format_many(lists:flatten(NodeDiags)).
current_node_details() ->
[{"~ncurrent node details:~n- node name: ~w", [node()]},
case init:get_argument(home) of
{ok, [[Home]]} -> {"- home dir: ~s", [Home]};
Other -> {"- no home dir: ~p", [Other]}
end,
{"- cookie hash: ~s", [cookie_hash()]}].
diagnostics_node(Node) ->
{Name, Host} = parts(Node),
[{"~s:", [Node]} |
case names(Host) of
{error, Reason} ->
[{" * unable to connect to epmd (port ~s) on ~s: ~s~n",
[epmd_port(), Host, rabbit_misc:format_inet_error(Reason)]}];
{ok, NamePorts} ->
diagnostics_node0(Name, Host, NamePorts)
end].
epmd_port() ->
case init:get_argument(epmd_port) of
{ok, [[Port | _] | _]} when is_list(Port) -> Port;
error -> "4369"
end.
diagnostics_node0(Name, Host, NamePorts) ->
case [{N, P} || {N, P} <- NamePorts, N =:= Name] of
[] ->
{SelfName, SelfHost} = parts(node()),
Others = [list_to_atom(N) || {N, _} <- NamePorts,
N =/= case SelfHost of
Host -> SelfName;
_ -> never_matches
end],
[{" * ~s seems not to be running at all", [Name]} |
case Others of
[] -> [{" * no other nodes on ~s", [Host]}];
_ -> [{" * other nodes on ~s: ~p", [Host, Others]}]
end];
[{Name, Port}] ->
[{" * found ~s (port ~b)", [Name, Port]} |
case diagnose_connect(Host, Port) of
ok ->
[{" * TCP connection succeeded~n"
" * suggestion: hostname mismatch?~n"
" * suggestion: is the cookie set correctly?", []}];
{error, Reason} ->
[{" * can't establish TCP connection, reason: ~s~n"
" * suggestion: blocked by firewall?",
[rabbit_misc:format_inet_error(Reason)]}]
end]
end.
diagnose_connect(Host, Port) ->
case inet:gethostbyname(Host) of
{ok, #hostent{h_addrtype = Family}} ->
case gen_tcp:connect(Host, Port, [Family],
?TCP_DIAGNOSTIC_TIMEOUT) of
{ok, Socket} -> gen_tcp:close(Socket),
ok;
{error, _} = E -> E
end;
{error, _} = E ->
E
end.
make({Prefix, Suffix}) -> list_to_atom(lists:append([Prefix, "@", Suffix]));
make(NodeStr) -> make(parts(NodeStr)).
parts(Node) when is_atom(Node) ->
parts(atom_to_list(Node));
parts(NodeStr) ->
case lists:splitwith(fun (E) -> E =/= $@ end, NodeStr) of
{Prefix, []} -> {_, Suffix} = parts(node()),
{Prefix, Suffix};
{Prefix, Suffix} -> {Prefix, tl(Suffix)}
end.
cookie_hash() ->
base64:encode_to_string(erlang:md5(atom_to_list(erlang:get_cookie()))).
is_running(Node, Application) ->
case rpc:call(Node, rabbit_misc, which_applications, []) of
{badrpc, _} -> false;
Apps -> proplists:is_defined(Application, Apps)
end.
is_process_running(Node, Process) ->
case rpc:call(Node, erlang, whereis, [Process]) of
{badrpc, _} -> false;
undefined -> false;
P when is_pid(P) -> true
end.
cluster_name() ->
rabbit_runtime_parameters:value_global(
cluster_name, cluster_name_default()).
cluster_name_default() ->
{ID, _} = rabbit_nodes:parts(node()),
{ok, Host} = inet:gethostname(),
{ok, #hostent{h_name = FQDN}} = inet:gethostbyname(Host),
list_to_binary(atom_to_list(rabbit_nodes:make({ID, FQDN}))).
set_cluster_name(Name) ->
rabbit_runtime_parameters:set_global(cluster_name, Name).
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