firehol/netdata

// SPDX-License-Identifier: GPL-3.0-or-later

package dnsdist

import (
    _ "embed"
    "errors"
    "net/http"
    "time"

    "github.com/netdata/netdata/go/plugins/plugin/go.d/agent/module"
    "github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/confopt"
    "github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/web"
)

//go:embed "config_schema.json"
var configSchema string

func init() {
    module.Register("dnsdist", module.Creator{
        JobConfigSchema: configSchema,
        Defaults: module.Defaults{
            UpdateEvery: 1,
        },
        Create: func() module.Module { return New() },
        Config: func() any { return &Config{} },
    })
}

func New() *DNSdist {
    return &DNSdist{
        Config: Config{
            HTTPConfig: web.HTTPConfig{
                RequestConfig: web.RequestConfig{
                    URL: "http://127.0.0.1:8083",
                },
                ClientConfig: web.ClientConfig{
                    Timeout: confopt.Duration(time.Second),
                },
            },
        },
    }
}

type Config struct {
    UpdateEvery    int `yaml:"update_every,omitempty" json:"update_every"`
    web.HTTPConfig `yaml:",inline" json:""`
}

type DNSdist struct {
    module.Base
    Config `yaml:",inline" json:""`

    charts *module.Charts

    httpClient *http.Client
}

func (d *DNSdist) Configuration() any {
    return d.Config
}

func (d *DNSdist) Init() error {
    err := d.validateConfig()
    if err != nil {
        d.Errorf("config validation: %v", err)
        return err
    }

    client, err := d.initHTTPClient()
    if err != nil {
        d.Errorf("init HTTP client: %v", err)
        return err
    }
    d.httpClient = client

    cs, err := d.initCharts()
    if err != nil {
        d.Errorf("init charts: %v", err)
        return err
    }
    d.charts = cs

    return nil
}

func (d *DNSdist) Check() error {
    mx, err := d.collect()
    if err != nil {
        d.Error(err)
        return err
    }
    if len(mx) == 0 {
        return errors.New("no metrics collected")

    }
    return nil
}

func (d *DNSdist) Charts() *module.Charts {
    return d.charts
}

func (d *DNSdist) Collect() map[string]int64 {
    ms, err := d.collect()
    if err != nil {
        d.Error(err)
    }

    if len(ms) == 0 {
        return nil
    }

    return ms
}

func (d *DNSdist) Cleanup() {
    if d.httpClient == nil {
        return
    }
    d.httpClient.CloseIdleConnections()
}