firehol/netdata

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

package riakkv

import (
    _ "embed"
    "errors"
    "net/http"
    "sync"
    "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("riakkv", module.Creator{
        Create: func() module.Module { return New() },
        // Riak updates the metrics on the /stats endpoint every 1 second.
        // If we use 1 here, it means we might get weird jitter in the graph,
        // so the default is set to 2 seconds to prevent that.
        Defaults: module.Defaults{
            UpdateEvery: 2,
        },
        JobConfigSchema: configSchema,
        Config:          func() any { return &Config{} },
    })
}

func New() *RiakKv {
    return &RiakKv{
        Config: Config{
            HTTPConfig: web.HTTPConfig{
                RequestConfig: web.RequestConfig{
                    // https://docs.riak.com/riak/kv/2.2.3/developing/api/http/status.1.html
                    URL: "http://127.0.0.1:8098/stats",
                },
                ClientConfig: web.ClientConfig{
                    Timeout: confopt.Duration(time.Second),
                },
            },
        },
        once:   &sync.Once{},
        charts: charts.Copy(),
    }
}

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

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

    once   *sync.Once
    charts *module.Charts

    httpClient *http.Client
}

func (r *RiakKv) Configuration() any {
    return r.Config
}

func (r *RiakKv) Init() error {
    if r.URL == "" {
        r.Errorf("url required but not set")
        return errors.New("url not set")
    }

    httpClient, err := web.NewHTTPClient(r.ClientConfig)
    if err != nil {
        r.Errorf("init HTTP client: %v", err)
        return err
    }
    r.httpClient = httpClient

    r.Debugf("using URL %s", r.URL)
    r.Debugf("using timeout: %s", r.Timeout)

    return nil
}

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

    }
    return nil
}

func (r *RiakKv) Charts() *module.Charts {
    return r.charts
}

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

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

func (r *RiakKv) Cleanup() {
    if r.httpClient != nil {
        r.httpClient.CloseIdleConnections()
    }
}