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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
#!/usr/bin/env ruby
require 'spec_helper'
require 'puppet/network/resolver'
describe Puppet::Network::Resolver do
before do
@dns_mock_object = mock('dns')
Resolv::DNS.stubs(:new).returns(@dns_mock_object)
@rr_type = Resolv::DNS::Resource::IN::SRV
@test_srv_domain = "domain.com"
@test_a_hostname = "puppet.domain.com"
@test_port = 1000
# The records we should use.
@test_records = [
# priority, weight, port, hostname
Resolv::DNS::Resource::IN::SRV.new(0, 20, 8140, "puppet1.domain.com"),
Resolv::DNS::Resource::IN::SRV.new(0, 80, 8140, "puppet2.domain.com"),
Resolv::DNS::Resource::IN::SRV.new(1, 1, 8140, "puppet3.domain.com"),
Resolv::DNS::Resource::IN::SRV.new(4, 1, 8140, "puppet4.domain.com")
]
end
describe 'when the domain is not known' do
before :each do
@dns_mock_object.stubs(:getresources).returns(@test_records)
end
describe 'because domain is nil' do
it 'does not yield' do
Puppet::Network::Resolver.each_srv_record(nil) do |_,_,_|
raise Exception.new("nil domain caused SRV lookup")
end
end
end
describe 'because domain is an empty string' do
it 'does not yield' do
Puppet::Network::Resolver.each_srv_record('') do |_,_,_|
raise Exception.new("nil domain caused SRV lookup")
end
end
end
end
describe "when resolving a host without SRV records" do
it "should not yield anything" do
# No records returned for a DNS entry without any SRV records
@dns_mock_object.expects(:getresources).with(
"_x-puppet._tcp.#{@test_a_hostname}",
@rr_type
).returns([])
Puppet::Network::Resolver.each_srv_record(@test_a_hostname) do |hostname, port, remaining|
raise Exception.new("host with no records passed block")
end
end
end
describe "when resolving a host with SRV records" do
it "should iterate through records in priority order" do
# The order of the records that should be returned,
# an array means unordered (for weight)
order = {
0 => ["puppet1.domain.com", "puppet2.domain.com"],
1 => ["puppet3.domain.com"],
2 => ["puppet4.domain.com"]
}
@dns_mock_object.expects(:getresources).with(
"_x-puppet._tcp.#{@test_srv_domain}",
@rr_type
).returns(@test_records)
Puppet::Network::Resolver.each_srv_record(@test_srv_domain) do |hostname, port|
expected_priority = order.keys.min
order[expected_priority].should include(hostname)
port.should_not be(@test_port)
# Remove the host from our expected hosts
order[expected_priority].delete hostname
# Remove this priority level if we're done with it
order.delete expected_priority if order[expected_priority] == []
end
end
it "should fall back to the :puppet service if no records are found for a more specific service" do
# The order of the records that should be returned,
# an array means unordered (for weight)
order = {
0 => ["puppet1.domain.com", "puppet2.domain.com"],
1 => ["puppet3.domain.com"],
2 => ["puppet4.domain.com"]
}
@dns_mock_object.expects(:getresources).with(
"_x-puppet-report._tcp.#{@test_srv_domain}",
@rr_type
).returns([])
@dns_mock_object.expects(:getresources).with(
"_x-puppet._tcp.#{@test_srv_domain}",
@rr_type
).returns(@test_records)
Puppet::Network::Resolver.each_srv_record(@test_srv_domain, :report) do |hostname, port|
expected_priority = order.keys.min
order[expected_priority].should include(hostname)
port.should_not be(@test_port)
# Remove the host from our expected hosts
order[expected_priority].delete hostname
# Remove this priority level if we're done with it
order.delete expected_priority if order[expected_priority] == []
end
end
it "should use SRV records from the specific service if they exist" do
# The order of the records that should be returned,
# an array means unordered (for weight)
order = {
0 => ["puppet1.domain.com", "puppet2.domain.com"],
1 => ["puppet3.domain.com"],
2 => ["puppet4.domain.com"]
}
bad_records = [
# priority, weight, port, hostname
Resolv::DNS::Resource::IN::SRV.new(0, 20, 8140, "puppet1.bad.domain.com"),
Resolv::DNS::Resource::IN::SRV.new(0, 80, 8140, "puppet2.bad.domain.com"),
Resolv::DNS::Resource::IN::SRV.new(1, 1, 8140, "puppet3.bad.domain.com"),
Resolv::DNS::Resource::IN::SRV.new(4, 1, 8140, "puppet4.bad.domain.com")
]
@dns_mock_object.expects(:getresources).with(
"_x-puppet-report._tcp.#{@test_srv_domain}",
@rr_type
).returns(@test_records)
@dns_mock_object.stubs(:getresources).with(
"_x-puppet._tcp.#{@test_srv_domain}",
@rr_type
).returns(bad_records)
Puppet::Network::Resolver.each_srv_record(@test_srv_domain, :report) do |hostname, port|
expected_priority = order.keys.min
order[expected_priority].should include(hostname)
port.should_not be(@test_port)
# Remove the host from our expected hosts
order[expected_priority].delete hostname
# Remove this priority level if we're done with it
order.delete expected_priority if order[expected_priority] == []
end
end
end
describe "when finding weighted servers" do
it "should return nil when no records were found" do
Puppet::Network::Resolver.find_weighted_server([]).should == nil
end
it "should return the first record when one record is passed" do
result = Puppet::Network::Resolver.find_weighted_server([@test_records.first])
result.should == @test_records.first
end
{
"all have weights" => [1, 3, 2, 4],
"some have weights" => [2, 0, 1, 0],
"none have weights" => [0, 0, 0, 0],
}.each do |name, weights|
it "should return correct results when #{name}" do
records = []
count = 0
weights.each do |w|
count += 1
# priority, weight, port, server
records << Resolv::DNS::Resource::IN::SRV.new(0, w, 1, count.to_s)
end
seen = Hash.new(0)
total_weight = records.inject(0) do |sum, record|
sum + Puppet::Network::Resolver.weight(record)
end
total_weight.times do |n|
Kernel.expects(:rand).once.with(total_weight).returns(n)
server = Puppet::Network::Resolver.find_weighted_server(records)
seen[server] += 1
end
seen.length.should == records.length
records.each do |record|
seen[record].should == Puppet::Network::Resolver.weight(record)
end
end
end
end
end
|
