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364 lines
9.3 KiB
364 lines
9.3 KiB
// Copyright 2019 The Prometheus Authors |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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package dns |
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import ( |
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"context" |
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"fmt" |
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"net" |
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"testing" |
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"time" |
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"github.com/go-kit/log" |
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"github.com/miekg/dns" |
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"github.com/prometheus/client_golang/prometheus" |
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"github.com/prometheus/common/model" |
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"github.com/stretchr/testify/require" |
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"go.uber.org/goleak" |
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"gopkg.in/yaml.v2" |
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"github.com/prometheus/prometheus/discovery" |
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"github.com/prometheus/prometheus/discovery/targetgroup" |
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) |
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func TestMain(m *testing.M) { |
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goleak.VerifyTestMain(m) |
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} |
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func TestDNS(t *testing.T) { |
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testCases := []struct { |
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name string |
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config SDConfig |
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lookup func(name string, qtype uint16, logger log.Logger) (*dns.Msg, error) |
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|
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expected []*targetgroup.Group |
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}{ |
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{ |
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name: "A record query with error", |
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config: SDConfig{ |
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Names: []string{"web.example.com."}, |
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RefreshInterval: model.Duration(time.Minute), |
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Port: 80, |
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Type: "A", |
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}, |
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lookup: func(name string, qtype uint16, logger log.Logger) (*dns.Msg, error) { |
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return nil, fmt.Errorf("some error") |
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}, |
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expected: []*targetgroup.Group{}, |
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}, |
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{ |
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name: "A record query", |
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config: SDConfig{ |
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Names: []string{"web.example.com."}, |
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RefreshInterval: model.Duration(time.Minute), |
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Port: 80, |
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Type: "A", |
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}, |
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lookup: func(name string, qtype uint16, logger log.Logger) (*dns.Msg, error) { |
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return &dns.Msg{ |
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Answer: []dns.RR{ |
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&dns.A{A: net.IPv4(192, 0, 2, 2)}, |
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}, |
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}, |
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nil |
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}, |
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expected: []*targetgroup.Group{ |
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{ |
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Source: "web.example.com.", |
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Targets: []model.LabelSet{ |
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{ |
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"__address__": "192.0.2.2:80", |
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"__meta_dns_name": "web.example.com.", |
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"__meta_dns_srv_record_target": "", |
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"__meta_dns_srv_record_port": "", |
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"__meta_dns_mx_record_target": "", |
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"__meta_dns_ns_record_target": "", |
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}, |
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}, |
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}, |
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}, |
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}, |
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{ |
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name: "AAAA record query", |
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config: SDConfig{ |
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Names: []string{"web.example.com."}, |
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RefreshInterval: model.Duration(time.Minute), |
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Port: 80, |
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Type: "AAAA", |
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}, |
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lookup: func(name string, qtype uint16, logger log.Logger) (*dns.Msg, error) { |
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return &dns.Msg{ |
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Answer: []dns.RR{ |
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&dns.AAAA{AAAA: net.IPv6loopback}, |
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}, |
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}, |
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nil |
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}, |
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expected: []*targetgroup.Group{ |
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{ |
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Source: "web.example.com.", |
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Targets: []model.LabelSet{ |
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{ |
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"__address__": "[::1]:80", |
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"__meta_dns_name": "web.example.com.", |
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"__meta_dns_srv_record_target": "", |
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"__meta_dns_srv_record_port": "", |
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"__meta_dns_mx_record_target": "", |
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"__meta_dns_ns_record_target": "", |
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}, |
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}, |
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}, |
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}, |
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}, |
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{ |
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name: "SRV record query", |
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config: SDConfig{ |
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Names: []string{"_mysql._tcp.db.example.com."}, |
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Type: "SRV", |
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RefreshInterval: model.Duration(time.Minute), |
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}, |
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lookup: func(name string, qtype uint16, logger log.Logger) (*dns.Msg, error) { |
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return &dns.Msg{ |
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Answer: []dns.RR{ |
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&dns.SRV{Port: 3306, Target: "db1.example.com."}, |
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&dns.SRV{Port: 3306, Target: "db2.example.com."}, |
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}, |
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}, |
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nil |
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}, |
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expected: []*targetgroup.Group{ |
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{ |
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Source: "_mysql._tcp.db.example.com.", |
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Targets: []model.LabelSet{ |
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{ |
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"__address__": "db1.example.com:3306", |
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"__meta_dns_name": "_mysql._tcp.db.example.com.", |
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"__meta_dns_srv_record_target": "db1.example.com.", |
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"__meta_dns_srv_record_port": "3306", |
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"__meta_dns_mx_record_target": "", |
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"__meta_dns_ns_record_target": "", |
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}, |
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{ |
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"__address__": "db2.example.com:3306", |
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"__meta_dns_name": "_mysql._tcp.db.example.com.", |
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"__meta_dns_srv_record_target": "db2.example.com.", |
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"__meta_dns_srv_record_port": "3306", |
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"__meta_dns_mx_record_target": "", |
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"__meta_dns_ns_record_target": "", |
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}, |
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}, |
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}, |
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}, |
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}, |
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{ |
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name: "SRV record query with unsupported resource records", |
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config: SDConfig{ |
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Names: []string{"_mysql._tcp.db.example.com."}, |
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RefreshInterval: model.Duration(time.Minute), |
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}, |
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lookup: func(name string, qtype uint16, logger log.Logger) (*dns.Msg, error) { |
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return &dns.Msg{ |
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Answer: []dns.RR{ |
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&dns.SRV{Port: 3306, Target: "db1.example.com."}, |
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&dns.TXT{Txt: []string{"this should be discarded"}}, |
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}, |
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}, |
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nil |
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}, |
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expected: []*targetgroup.Group{ |
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{ |
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Source: "_mysql._tcp.db.example.com.", |
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Targets: []model.LabelSet{ |
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{ |
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"__address__": "db1.example.com:3306", |
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"__meta_dns_name": "_mysql._tcp.db.example.com.", |
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"__meta_dns_srv_record_target": "db1.example.com.", |
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"__meta_dns_srv_record_port": "3306", |
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"__meta_dns_mx_record_target": "", |
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"__meta_dns_ns_record_target": "", |
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}, |
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}, |
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}, |
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}, |
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}, |
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{ |
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name: "SRV record query with empty answer (NXDOMAIN)", |
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config: SDConfig{ |
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Names: []string{"_mysql._tcp.db.example.com."}, |
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RefreshInterval: model.Duration(time.Minute), |
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}, |
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lookup: func(name string, qtype uint16, logger log.Logger) (*dns.Msg, error) { |
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return &dns.Msg{}, nil |
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}, |
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expected: []*targetgroup.Group{ |
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{ |
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Source: "_mysql._tcp.db.example.com.", |
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}, |
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}, |
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}, |
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{ |
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name: "MX record query", |
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config: SDConfig{ |
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Names: []string{"example.com."}, |
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Type: "MX", |
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Port: 25, |
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RefreshInterval: model.Duration(time.Minute), |
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}, |
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lookup: func(name string, qtype uint16, logger log.Logger) (*dns.Msg, error) { |
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return &dns.Msg{ |
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Answer: []dns.RR{ |
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&dns.MX{Preference: 0, Mx: "smtp1.example.com."}, |
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&dns.MX{Preference: 10, Mx: "smtp2.example.com."}, |
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}, |
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}, |
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nil |
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}, |
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expected: []*targetgroup.Group{ |
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{ |
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Source: "example.com.", |
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Targets: []model.LabelSet{ |
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{ |
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"__address__": "smtp1.example.com:25", |
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"__meta_dns_name": "example.com.", |
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"__meta_dns_srv_record_target": "", |
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"__meta_dns_srv_record_port": "", |
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"__meta_dns_mx_record_target": "smtp1.example.com.", |
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"__meta_dns_ns_record_target": "", |
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}, |
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{ |
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"__address__": "smtp2.example.com:25", |
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"__meta_dns_name": "example.com.", |
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"__meta_dns_srv_record_target": "", |
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"__meta_dns_srv_record_port": "", |
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"__meta_dns_mx_record_target": "smtp2.example.com.", |
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"__meta_dns_ns_record_target": "", |
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}, |
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}, |
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}, |
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}, |
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}, |
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} |
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for _, tc := range testCases { |
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tc := tc |
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t.Run(tc.name, func(t *testing.T) { |
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t.Parallel() |
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reg := prometheus.NewRegistry() |
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refreshMetrics := discovery.NewRefreshMetrics(reg) |
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metrics := tc.config.NewDiscovererMetrics(reg, refreshMetrics) |
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require.NoError(t, metrics.Register()) |
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sd, err := NewDiscovery(tc.config, nil, metrics) |
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require.NoError(t, err) |
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sd.lookupFn = tc.lookup |
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tgs, err := sd.refresh(context.Background()) |
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require.NoError(t, err) |
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require.Equal(t, tc.expected, tgs) |
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metrics.Unregister() |
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}) |
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} |
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} |
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func TestSDConfigUnmarshalYAML(t *testing.T) { |
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marshal := func(c SDConfig) []byte { |
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d, err := yaml.Marshal(c) |
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if err != nil { |
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panic(err) |
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} |
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return d |
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} |
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unmarshal := func(d []byte) func(interface{}) error { |
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return func(o interface{}) error { |
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return yaml.Unmarshal(d, o) |
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} |
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} |
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cases := []struct { |
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name string |
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input SDConfig |
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expectErr bool |
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}{ |
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{ |
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name: "valid srv", |
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input: SDConfig{ |
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Names: []string{"a.example.com", "b.example.com"}, |
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Type: "SRV", |
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}, |
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expectErr: false, |
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}, |
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{ |
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name: "valid a", |
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input: SDConfig{ |
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Names: []string{"a.example.com", "b.example.com"}, |
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Type: "A", |
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Port: 5300, |
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}, |
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expectErr: false, |
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}, |
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{ |
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name: "valid aaaa", |
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input: SDConfig{ |
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Names: []string{"a.example.com", "b.example.com"}, |
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Type: "AAAA", |
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Port: 5300, |
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}, |
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expectErr: false, |
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}, |
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{ |
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name: "invalid a without port", |
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input: SDConfig{ |
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Names: []string{"a.example.com", "b.example.com"}, |
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Type: "A", |
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}, |
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expectErr: true, |
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}, |
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{ |
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name: "invalid aaaa without port", |
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input: SDConfig{ |
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Names: []string{"a.example.com", "b.example.com"}, |
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Type: "AAAA", |
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}, |
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expectErr: true, |
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}, |
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{ |
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name: "invalid empty names", |
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input: SDConfig{ |
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Names: []string{}, |
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Type: "AAAA", |
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}, |
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expectErr: true, |
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}, |
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{ |
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name: "invalid unknown dns type", |
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input: SDConfig{ |
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Names: []string{"a.example.com", "b.example.com"}, |
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Type: "PTR", |
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}, |
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expectErr: true, |
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}, |
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} |
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for _, c := range cases { |
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t.Run(c.name, func(t *testing.T) { |
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var config SDConfig |
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d := marshal(c.input) |
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err := config.UnmarshalYAML(unmarshal(d)) |
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require.Equal(t, c.expectErr, err != nil) |
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}) |
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} |
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}
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