firehol/netdata

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

package supervisord

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/web"
)

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

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

func New() *Supervisord {
    return &Supervisord{
        Config: Config{
            URL: "http://127.0.0.1:9001/RPC2",
            ClientConfig: web.ClientConfig{
                Timeout: confopt.Duration(time.Second),
            },
        },

        charts: summaryCharts.Copy(),
        cache:  make(map[string]map[string]bool),
    }
}

type Config struct {
    UpdateEvery      int    `yaml:"update_every,omitempty" json:"update_every"`
    URL              string `yaml:"url" json:"url"`
    web.ClientConfig `yaml:",inline" json:""`
}

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

        charts *module.Charts

        client supervisorClient

        cache map[string]map[string]bool // map[group][procName]collected
    }
    supervisorClient interface {
        getAllProcessInfo() ([]processStatus, error)
        closeIdleConnections()
    }
)

func (s *Supervisord) Configuration() any {
    return s.Config
}

func (s *Supervisord) Init() error {
    err := s.verifyConfig()
    if err != nil {
        s.Errorf("verify config: %v", err)
        return err
    }

    client, err := s.initSupervisorClient()
    if err != nil {
        s.Errorf("init supervisord client: %v", err)
        return err
    }
    s.client = client

    return nil
}

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

func (s *Supervisord) Charts() *module.Charts {
    return s.charts
}

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

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

func (s *Supervisord) Cleanup() {
    if s.client != nil {
        s.client.closeIdleConnections()
    }
}