firehol/netdata

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

package memcached

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"
)

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

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

func New() *Memcached {
    return &Memcached{
        Config: Config{
            Address: "127.0.0.1:11211",
            Timeout: confopt.Duration(time.Second * 1),
        },
        newMemcachedConn: newMemcachedConn,
        charts:           charts.Copy(),
    }
}

type Config struct {
    UpdateEvery int              `yaml:"update_every,omitempty" json:"update_every"`
    Address     string           `yaml:"address" json:"address"`
    Timeout     confopt.Duration `yaml:"timeout" json:"timeout"`
}

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

        charts *module.Charts

        newMemcachedConn func(Config) memcachedConn
        conn             memcachedConn
    }
    memcachedConn interface {
        connect() error
        disconnect()
        queryStats() ([]byte, error)
    }
)

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

func (m *Memcached) Init() error {
    if m.Address == "" {
        m.Error("config: 'address' not set")
        return errors.New("address not set")
    }

    return nil
}

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

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

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

    return mx
}

func (m *Memcached) Cleanup() {
    if m.conn != nil {
        m.conn.disconnect()
        m.conn = nil
    }
}