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// SPDX-License-Identifier: GPL-3.0-or-later
package dnsquery
import (
"errors"
"os"
"testing"
"time"
"github.com/netdata/netdata/go/go.d.plugin/agent/module"
"github.com/netdata/netdata/go/go.d.plugin/pkg/web"
"github.com/miekg/dns"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
var (
dataConfigJSON, _ = os.ReadFile("testdata/config.json")
dataConfigYAML, _ = os.ReadFile("testdata/config.yaml")
)
func Test_testDataIsValid(t *testing.T) {
for name, data := range map[string][]byte{
"dataConfigJSON": dataConfigJSON,
"dataConfigYAML": dataConfigYAML,
} {
require.NotNil(t, data, name)
}
}
func TestDNSQuery_ConfigurationSerialize(t *testing.T) {
module.TestConfigurationSerialize(t, &DNSQuery{}, dataConfigJSON, dataConfigYAML)
}
func TestDNSQuery_Init(t *testing.T) {
tests := map[string]struct {
wantFail bool
config Config
}{
"success when all set": {
wantFail: false,
config: Config{
Domains: []string{"example.com"},
Servers: []string{"192.0.2.0"},
Network: "udp",
RecordTypes: []string{"A"},
Port: 53,
Timeout: web.Duration(time.Second),
},
},
"success when using deprecated record_type": {
wantFail: false,
config: Config{
Domains: []string{"example.com"},
Servers: []string{"192.0.2.0"},
Network: "udp",
RecordType: "A",
Port: 53,
Timeout: web.Duration(time.Second),
},
},
"fail with default": {
wantFail: true,
config: New().Config,
},
"fail when domains not set": {
wantFail: true,
config: Config{
Domains: nil,
Servers: []string{"192.0.2.0"},
Network: "udp",
RecordTypes: []string{"A"},
Port: 53,
Timeout: web.Duration(time.Second),
},
},
"fail when servers not set": {
wantFail: true,
config: Config{
Domains: []string{"example.com"},
Servers: nil,
Network: "udp",
RecordTypes: []string{"A"},
Port: 53,
Timeout: web.Duration(time.Second),
},
},
"fail when network is invalid": {
wantFail: true,
config: Config{
Domains: []string{"example.com"},
Servers: []string{"192.0.2.0"},
Network: "gcp",
RecordTypes: []string{"A"},
Port: 53,
Timeout: web.Duration(time.Second),
},
},
"fail when record_type is invalid": {
wantFail: true,
config: Config{
Domains: []string{"example.com"},
Servers: []string{"192.0.2.0"},
Network: "udp",
RecordTypes: []string{"B"},
Port: 53,
Timeout: web.Duration(time.Second),
},
},
}
for name, test := range tests {
t.Run(name, func(t *testing.T) {
dq := New()
dq.Config = test.config
if test.wantFail {
assert.Error(t, dq.Init())
} else {
assert.NoError(t, dq.Init())
}
})
}
}
func TestDNSQuery_Check(t *testing.T) {
tests := map[string]struct {
wantFail bool
prepare func() *DNSQuery
}{
"success when DNS query successful": {
wantFail: false,
prepare: caseDNSClientOK,
},
"success when DNS query returns an error": {
wantFail: false,
prepare: caseDNSClientErr,
},
}
for name, test := range tests {
t.Run(name, func(t *testing.T) {
dq := test.prepare()
require.NoError(t, dq.Init())
if test.wantFail {
assert.Error(t, dq.Check())
} else {
assert.NoError(t, dq.Check())
}
})
}
}
func TestDNSQuery_Charts(t *testing.T) {
dq := New()
dq.Domains = []string{"google.com"}
dq.Servers = []string{"192.0.2.0", "192.0.2.1"}
require.NoError(t, dq.Init())
assert.NotNil(t, dq.Charts())
assert.Len(t, *dq.Charts(), len(dnsChartsTmpl)*len(dq.Servers))
}
func TestDNSQuery_Collect(t *testing.T) {
tests := map[string]struct {
prepare func() *DNSQuery
wantMetrics map[string]int64
}{
"success when DNS query successful": {
prepare: caseDNSClientOK,
wantMetrics: map[string]int64{
"server_192.0.2.0_record_A_query_status_dns_error": 0,
"server_192.0.2.0_record_A_query_status_network_error": 0,
"server_192.0.2.0_record_A_query_status_success": 1,
"server_192.0.2.0_record_A_query_time": 1000000000,
"server_192.0.2.1_record_A_query_status_dns_error": 0,
"server_192.0.2.1_record_A_query_status_network_error": 0,
"server_192.0.2.1_record_A_query_status_success": 1,
"server_192.0.2.1_record_A_query_time": 1000000000,
},
},
"fail when DNS query returns an error": {
prepare: caseDNSClientErr,
wantMetrics: map[string]int64{
"server_192.0.2.0_record_A_query_status_dns_error": 0,
"server_192.0.2.0_record_A_query_status_network_error": 1,
"server_192.0.2.0_record_A_query_status_success": 0,
"server_192.0.2.1_record_A_query_status_dns_error": 0,
"server_192.0.2.1_record_A_query_status_network_error": 1,
"server_192.0.2.1_record_A_query_status_success": 0,
},
},
}
for name, test := range tests {
t.Run(name, func(t *testing.T) {
dq := test.prepare()
require.NoError(t, dq.Init())
mx := dq.Collect()
require.Equal(t, test.wantMetrics, mx)
})
}
}
func caseDNSClientOK() *DNSQuery {
dq := New()
dq.Domains = []string{"example.com"}
dq.Servers = []string{"192.0.2.0", "192.0.2.1"}
dq.newDNSClient = func(_ string, _ time.Duration) dnsClient {
return mockDNSClient{errOnExchange: false}
}
return dq
}
func caseDNSClientErr() *DNSQuery {
dq := New()
dq.Domains = []string{"example.com"}
dq.Servers = []string{"192.0.2.0", "192.0.2.1"}
dq.newDNSClient = func(_ string, _ time.Duration) dnsClient {
return mockDNSClient{errOnExchange: true}
}
return dq
}
type mockDNSClient struct {
errOnExchange bool
}
func (m mockDNSClient) Exchange(_ *dns.Msg, _ string) (response *dns.Msg, rtt time.Duration, err error) {
if m.errOnExchange {
return nil, time.Second, errors.New("mock.Exchange() error")
}
return nil, time.Second, nil
}
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