1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
%% 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 Federation.
%%
%% The Initial Developer of the Original Code is GoPivotal, Inc.
%% Copyright (c) 2007-2014 GoPivotal, Inc. All rights reserved.
%%
-module(rabbit_federation_upstream).
-include("rabbit_federation.hrl").
-include_lib("amqp_client/include/amqp_client.hrl").
-export([federate/1, for/1, for/2, params_to_string/1, to_params/2]).
%% For testing
-export([from_set/2, remove_credentials/1]).
-import(rabbit_misc, [pget/2, pget/3]).
-import(rabbit_federation_util, [name/1, vhost/1, r/1]).
%%----------------------------------------------------------------------------
federate(XorQ) ->
rabbit_policy:get(<<"federation-upstream">>, XorQ) =/= undefined orelse
rabbit_policy:get(<<"federation-upstream-set">>, XorQ) =/= undefined.
for(XorQ) ->
case federate(XorQ) of
false -> [];
true -> from_set_contents(upstreams(XorQ), XorQ)
end.
for(XorQ, UpstreamName) ->
case federate(XorQ) of
false -> [];
true -> rabbit_federation_util:find_upstreams(
UpstreamName, from_set_contents(upstreams(XorQ), XorQ))
end.
upstreams(XorQ) ->
UName = rabbit_policy:get(<<"federation-upstream">>, XorQ),
USetName = rabbit_policy:get(<<"federation-upstream-set">>, XorQ),
%% Cannot define both, see rabbit_federation_parameters:validate_policy/1
case {UName, USetName} of
{undefined, undefined} -> [];
{undefined, _} -> set_contents(USetName, vhost(XorQ));
{_, undefined} -> [[{<<"upstream">>, UName}]]
end.
params_table(SafeURI, XorQ) ->
Key = case XorQ of
#exchange{} -> <<"exchange">>;
#amqqueue{} -> <<"queue">>
end,
[{<<"uri">>, longstr, SafeURI},
{Key, longstr, name(XorQ)}].
params_to_string(#upstream_params{safe_uri = SafeURI,
x_or_q = XorQ}) ->
print("~s on ~s", [rabbit_misc:rs(r(XorQ)), SafeURI]).
remove_credentials(URI) ->
list_to_binary(amqp_uri:remove_credentials(binary_to_list(URI))).
to_params(Upstream = #upstream{uris = URIs}, XorQ) ->
random:seed(now()),
URI = lists:nth(random:uniform(length(URIs)), URIs),
{ok, Params} = amqp_uri:parse(binary_to_list(URI), vhost(XorQ)),
XorQ1 = with_name(Upstream, vhost(Params), XorQ),
SafeURI = remove_credentials(URI),
#upstream_params{params = Params,
uri = URI,
x_or_q = XorQ1,
safe_uri = SafeURI,
table = params_table(SafeURI, XorQ)}.
print(Fmt, Args) -> iolist_to_binary(io_lib:format(Fmt, Args)).
from_set(SetName, XorQ) ->
from_set_contents(set_contents(SetName, vhost(XorQ)), XorQ).
set_contents(<<"all">>, VHost) ->
Upstreams = rabbit_runtime_parameters:list(
VHost, <<"federation-upstream">>),
[[{<<"upstream">>, pget(name, U)}] || U <- Upstreams];
set_contents(SetName, VHost) ->
case rabbit_runtime_parameters:value(
VHost, <<"federation-upstream-set">>, SetName) of
not_found -> [];
Set -> Set
end.
from_set_contents(Set, XorQ) ->
Results = [from_set_element(P, XorQ) || P <- Set],
[R || R <- Results, R =/= not_found].
from_set_element(UpstreamSetElem, XorQ) ->
Name = bget(upstream, UpstreamSetElem, []),
case rabbit_runtime_parameters:value(
vhost(XorQ), <<"federation-upstream">>, Name) of
not_found -> not_found;
Upstream -> from_upstream_or_set(
UpstreamSetElem, Name, Upstream, XorQ)
end.
from_upstream_or_set(US, Name, U, XorQ) ->
URIParam = bget(uri, US, U),
URIs = case URIParam of
B when is_binary(B) -> [B];
L when is_list(L) -> L
end,
#upstream{uris = URIs,
exchange_name = bget(exchange, US, U, name(XorQ)),
queue_name = bget(queue, US, U, name(XorQ)),
prefetch_count = bget('prefetch-count', US, U, ?DEF_PREFETCH),
reconnect_delay = bget('reconnect-delay', US, U, 1),
max_hops = bget('max-hops', US, U, 1),
expires = bget(expires, US, U, none),
message_ttl = bget('message-ttl', US, U, none),
trust_user_id = bget('trust-user-id', US, U, false),
ack_mode = list_to_atom(
binary_to_list(
bget('ack-mode', US, U, <<"on-confirm">>))),
ha_policy = bget('ha-policy', US, U, none),
name = Name}.
%%----------------------------------------------------------------------------
bget(K, L1, L2) -> bget(K, L1, L2, undefined).
bget(K0, L1, L2, D) ->
K = a2b(K0),
case pget(K, L1, undefined) of
undefined -> pget(K, L2, D);
Result -> Result
end.
a2b(A) -> list_to_binary(atom_to_list(A)).
with_name(#upstream{exchange_name = XNameBin}, VHostBin, X = #exchange{}) ->
X#exchange{name = rabbit_misc:r(VHostBin, exchange, XNameBin)};
with_name(#upstream{queue_name = QNameBin}, VHostBin, Q = #amqqueue{}) ->
Q#amqqueue{name = rabbit_misc:r(VHostBin, queue, QNameBin)}.
|
