firehol/netdata

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

package vernemq

import (
    _ "embed"
    "errors"
    "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/prometheus"
    "github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/web"
)

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

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

func New() *VerneMQ {
    return &VerneMQ{
        Config: Config{
            HTTPConfig: web.HTTPConfig{
                RequestConfig: web.RequestConfig{
                    URL: "http://127.0.0.1:8888/metrics",
                },
                ClientConfig: web.ClientConfig{
                    Timeout: confopt.Duration(time.Second),
                },
            },
        },
        charts: charts.Copy(),
        cache:  make(map[string]bool),
    }
}

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

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

        charts *Charts

        prom prometheus.Prometheus

        cache map[string]bool
    }
)

func (v *VerneMQ) Configuration() any {
    return v.Config
}

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

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

    return nil
}

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

func (v *VerneMQ) Charts() *Charts {
    return v.charts
}

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

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

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