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// SPDX-License-Identifier: GPL-3.0-or-later
package coredns
import (
_ "embed"
"errors"
"time"
"github.com/netdata/netdata/go/go.d.plugin/agent/module"
"github.com/netdata/netdata/go/go.d.plugin/pkg/matcher"
"github.com/netdata/netdata/go/go.d.plugin/pkg/prometheus"
"github.com/netdata/netdata/go/go.d.plugin/pkg/web"
"github.com/blang/semver/v4"
)
//go:embed "config_schema.json"
var configSchema string
func init() {
module.Register("coredns", module.Creator{
JobConfigSchema: configSchema,
Create: func() module.Module { return New() },
})
}
func New() *CoreDNS {
return &CoreDNS{
Config: Config{
HTTP: web.HTTP{
Request: web.Request{
URL: "http://127.0.0.1:9153/metrics",
},
Client: web.Client{
Timeout: web.Duration(time.Second),
},
},
},
charts: summaryCharts.Copy(),
collectedServers: make(map[string]bool),
collectedZones: make(map[string]bool),
}
}
type Config struct {
web.HTTP `yaml:",inline" json:""`
UpdateEvery int `yaml:"update_every" json:"update_every"`
PerServerStats matcher.SimpleExpr `yaml:"per_server_stats" json:"per_server_stats"`
PerZoneStats matcher.SimpleExpr `yaml:"per_zone_stats" json:"per_zone_stats"`
}
type CoreDNS struct {
module.Base
Config `yaml:",inline" json:""`
prom prometheus.Prometheus
charts *Charts
perServerMatcher matcher.Matcher
perZoneMatcher matcher.Matcher
collectedServers map[string]bool
collectedZones map[string]bool
skipVersionCheck bool
version *semver.Version
metricNames requestMetricsNames
}
func (cd *CoreDNS) Configuration() any {
return cd.Config
}
func (cd *CoreDNS) Init() error {
if err := cd.validateConfig(); err != nil {
cd.Errorf("config validation: %v", err)
return err
}
sm, err := cd.initPerServerMatcher()
if err != nil {
cd.Error(err)
return err
}
if sm != nil {
cd.perServerMatcher = sm
}
zm, err := cd.initPerZoneMatcher()
if err != nil {
cd.Error(err)
return err
}
if zm != nil {
cd.perZoneMatcher = zm
}
prom, err := cd.initPrometheusClient()
if err != nil {
cd.Error(err)
return err
}
cd.prom = prom
return nil
}
func (cd *CoreDNS) Check() error {
mx, err := cd.collect()
if err != nil {
cd.Error(err)
return err
}
if len(mx) == 0 {
return errors.New("no metrics collected")
}
return nil
}
func (cd *CoreDNS) Charts() *Charts {
return cd.charts
}
func (cd *CoreDNS) Collect() map[string]int64 {
mx, err := cd.collect()
if err != nil {
cd.Error(err)
return nil
}
return mx
}
func (cd *CoreDNS) Cleanup() {
if cd.prom != nil && cd.prom.HTTPClient() != nil {
cd.prom.HTTPClient().CloseIdleConnections()
}
}
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