1 files changed, 140 insertions, 0 deletions
diff --git a/src/go/collectors/go.d.plugin/modules/coredns/coredns.go b/src/go/collectors/go.d.plugin/modules/coredns/coredns.go
new file mode 100644
index 000000000..ec21860e3
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/modules/coredns/coredns.go
@@ -0,0 +1,140 @@
+// 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()
+	}
+}