netdata/netdata

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

package proxysql

import (
    "database/sql"
    _ "embed"
    "errors"
    _ "github.com/go-sql-driver/mysql"
    "sync"
    "time"

    "github.com/netdata/netdata/go/go.d.plugin/agent/module"
    "github.com/netdata/netdata/go/go.d.plugin/pkg/web"
)

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

func init() {
    module.Register("proxysql", module.Creator{
        JobConfigSchema: configSchema,
        Create:          func() module.Module { return New() },
    })
}

func New() *ProxySQL {
    return &ProxySQL{
        Config: Config{
            DSN:     "stats:stats@tcp(127.0.0.1:6032)/",
            Timeout: web.Duration(time.Second),
        },

        charts: baseCharts.Copy(),
        once:   &sync.Once{},
        cache: &cache{
            commands: make(map[string]*commandCache),
            users:    make(map[string]*userCache),
            backends: make(map[string]*backendCache),
        },
    }
}

type Config struct {
    UpdateEvery int          `yaml:"update_every" json:"update_every"`
    DSN         string       `yaml:"dsn" json:"dsn"`
    Timeout     web.Duration `yaml:"timeout" json:"timeout"`
}

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

    charts *module.Charts

    db *sql.DB

    once  *sync.Once
    cache *cache
}

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

func (p *ProxySQL) Init() error {
    if p.DSN == "" {
        p.Error("dsn not set")
        return errors.New("dsn not set")
    }

    p.Debugf("using DSN [%s]", p.DSN)

    return nil
}

func (p *ProxySQL) 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 *ProxySQL) Charts() *module.Charts {
    return p.charts
}

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

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

func (p *ProxySQL) Cleanup() {
    if p.db == nil {
        return
    }
    if err := p.db.Close(); err != nil {
        p.Errorf("cleanup: error on closing the ProxySQL instance [%s]: %v", p.DSN, err)
    }
    p.db = nil
}