firehol/netdata

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

package pulsar

import (
    _ "embed"
    "errors"
    "sync"
    "time"

    "github.com/netdata/netdata/go/plugins/pkg/matcher"
    "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/prometheus"
    "github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/web"
)

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

func init() {
    module.Register("pulsar", module.Creator{
        JobConfigSchema: configSchema,
        Defaults: module.Defaults{
            UpdateEvery: 60,
        },
        Create: func() module.Module { return New() },
        Config: func() any { return &Config{} },
    })
}

func New() *Pulsar {
    return &Pulsar{
        Config: Config{
            HTTPConfig: web.HTTPConfig{
                RequestConfig: web.RequestConfig{
                    URL: "http://127.0.0.1:8080/metrics",
                },
                ClientConfig: web.ClientConfig{
                    Timeout: confopt.Duration(time.Second * 5),
                },
            },
            TopicFilter: matcher.SimpleExpr{
                Includes: nil,
                Excludes: []string{"*"},
            },
        },
        once:               &sync.Once{},
        charts:             summaryCharts.Copy(),
        nsCharts:           namespaceCharts.Copy(),
        topicChartsMapping: topicChartsMapping(),
        cache:              newCache(),
        curCache:           newCache(),
    }
}

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

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

    charts   *Charts
    nsCharts *Charts

    prom prometheus.Prometheus

    topicFilter        matcher.Matcher
    cache              *cache
    curCache           *cache
    once               *sync.Once
    topicChartsMapping map[string]string
}

func (p *Pulsar) Configuration() any {
    return p.Config
}

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

    prom, err := p.initPrometheusClient()
    if err != nil {
        p.Error(err)
        return err
    }
    p.prom = prom

    m, err := p.initTopicFilerMatcher()
    if err != nil {
        p.Error(err)
        return err
    }
    p.topicFilter = m

    return nil
}

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

func (p *Pulsar) Charts() *Charts {
    return p.charts
}

func (p *Pulsar) Collect() map[string]int64 {
    mx, err := p.collect()
    if err != nil {
        p.Error(err)
    }

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

func (p *Pulsar) Cleanup() {
    if p.prom != nil && p.prom.HTTPClient() != nil {
        p.prom.HTTPClient().CloseIdleConnections()
    }
}