firehol/netdata

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

package pika

import (
    "context"
    _ "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/tlscfg"

    "github.com/blang/semver/v4"
    "github.com/redis/go-redis/v9"
)

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

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

func New() *Pika {
    return &Pika{
        Config: Config{
            Address: "redis://@localhost:9221",
            Timeout: confopt.Duration(time.Second),
        },

        collectedCommands: make(map[string]bool),
        collectedDbs:      make(map[string]bool),
    }
}

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

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

        charts *module.Charts

        pdb redisClient

        server            string
        version           *semver.Version
        collectedCommands map[string]bool
        collectedDbs      map[string]bool
    }
    redisClient interface {
        Info(ctx context.Context, section ...string) *redis.StringCmd
        Close() error
    }
)

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

func (p *Pika) Init() error {
    err := p.validateConfig()
    if err != nil {
        p.Errorf("config validation: %v", err)
        return err
    }

    pdb, err := p.initRedisClient()
    if err != nil {
        p.Errorf("init redis client: %v", err)
        return err
    }
    p.pdb = pdb

    charts, err := p.initCharts()
    if err != nil {
        p.Errorf("init charts: %v", err)
        return err
    }
    p.charts = charts

    return nil
}

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

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

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

func (p *Pika) Cleanup() {
    if p.pdb == nil {
        return
    }
    err := p.pdb.Close()
    if err != nil {
        p.Warningf("cleanup: error on closing redis client [%s]: %v", p.Address, err)
    }
    p.pdb = nil
}