netdata/netdata

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

package cassandra

import (
    _ "embed"
    "errors"
    "time"

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

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

func init() {
    module.Register("cassandra", module.Creator{
        JobConfigSchema: configSchema,
        Defaults: module.Defaults{
            UpdateEvery: 5,
        },
        Create: func() module.Module { return New() },
        Config: func() any { return &Config{} },
    })
}

func New() *Cassandra {
    return &Cassandra{
        Config: Config{
            HTTP: web.HTTP{
                Request: web.Request{
                    URL: "http://127.0.0.1:7072/metrics",
                },
                Client: web.Client{
                    Timeout: web.Duration(time.Second * 5),
                },
            },
        },
        charts:          baseCharts.Copy(),
        validateMetrics: true,
        mx:              newCassandraMetrics(),
    }
}

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

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

    charts *module.Charts

    prom prometheus.Prometheus

    validateMetrics bool

    mx *cassandraMetrics
}

func (c *Cassandra) Configuration() any {
    return c.Config
}

func (c *Cassandra) Init() error {
    if err := c.validateConfig(); err != nil {
        c.Errorf("error on validating config: %v", err)
        return err
    }

    prom, err := c.initPrometheusClient()
    if err != nil {
        c.Errorf("error on init prometheus client: %v", err)
        return err
    }
    c.prom = prom

    return nil
}

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

    }
    return nil
}

func (c *Cassandra) Charts() *module.Charts {
    return c.charts
}

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

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

func (c *Cassandra) Cleanup() {
    if c.prom != nil && c.prom.HTTPClient() != nil {
        c.prom.HTTPClient().CloseIdleConnections()
    }
}