firehol/netdata

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

package logstash

import (
    _ "embed"
    "errors"
    "net/http"
    "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("logstash", module.Creator{
        JobConfigSchema: configSchema,
        Create:          func() module.Module { return New() },
        Config:          func() any { return &Config{} },
    })
}

func New() *Logstash {
    return &Logstash{
        Config: Config{
            HTTPConfig: web.HTTPConfig{
                RequestConfig: web.RequestConfig{
                    URL: "http://localhost:9600",
                },
                ClientConfig: web.ClientConfig{
                    Timeout: confopt.Duration(time.Second),
                },
            },
        },
        charts:    charts.Copy(),
        pipelines: make(map[string]bool),
    }
}

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

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

    charts *module.Charts

    httpClient *http.Client

    pipelines map[string]bool
}

func (l *Logstash) Configuration() any {
    return l.Config
}

func (l *Logstash) Init() error {
    if l.URL == "" {
        l.Error("config validation: 'url' cannot be empty")
        return errors.New("url not set")
    }

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

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

    return nil
}

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

func (l *Logstash) Charts() *module.Charts {
    return l.charts
}

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

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

func (l *Logstash) Cleanup() {
    if l.httpClient != nil {
        l.httpClient.CloseIdleConnections()
    }
}