firehol/netdata

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

package monit

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

func New() *Monit {
    return &Monit{
        Config: Config{
            HTTPConfig: web.HTTPConfig{
                RequestConfig: web.RequestConfig{
                    URL:      "http://127.0.0.1:2812",
                    Username: "admin",
                    Password: "monit",
                },
                ClientConfig: web.ClientConfig{
                    Timeout: confopt.Duration(time.Second),
                },
            },
        },
        charts:       baseCharts.Copy(),
        seenServices: make(map[string]statusServiceCheck),
    }
}

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

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

    charts *module.Charts

    httpClient *http.Client

    seenServices map[string]statusServiceCheck
}

func (m *Monit) Configuration() any {
    return m.Config
}

func (m *Monit) Init() error {
    if m.URL == "" {
        m.Error("config: monit url is required but not set")
        return errors.New("config: missing URL")
    }

    httpClient, err := web.NewHTTPClient(m.ClientConfig)
    if err != nil {
        m.Errorf("init HTTP client: %v", err)
        return err
    }
    m.httpClient = httpClient

    m.Debugf("using URL %s", m.URL)
    m.Debugf("using timeout: %s", m.Timeout)

    return nil
}

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

    }
    return nil
}

func (m *Monit) Charts() *module.Charts {
    return m.charts
}

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

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

func (m *Monit) Cleanup() {
    if m.httpClient != nil {
        m.httpClient.CloseIdleConnections()
    }
}