firehol/netdata

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

package fluentd

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

    "github.com/netdata/netdata/go/plugins/pkg/matcher"
    "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("fluentd", module.Creator{
        JobConfigSchema: configSchema,
        Create:          func() module.Module { return New() },
        Config:          func() any { return &Config{} },
    })
}

func New() *Fluentd {
    return &Fluentd{
        Config: Config{
            HTTPConfig: web.HTTPConfig{
                RequestConfig: web.RequestConfig{
                    URL: "http://127.0.0.1:24220",
                },
                ClientConfig: web.ClientConfig{
                    Timeout: confopt.Duration(time.Second),
                },
            }},
        activePlugins: make(map[string]bool),
        charts:        charts.Copy(),
    }
}

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

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

    charts *Charts

    apiClient *apiClient

    permitPlugin  matcher.Matcher
    activePlugins map[string]bool
}

func (f *Fluentd) Configuration() any {
    return f.Config
}

func (f *Fluentd) Init() error {
    if err := f.validateConfig(); err != nil {
        f.Error(err)
        return err
    }

    pm, err := f.initPermitPluginMatcher()
    if err != nil {
        f.Error(err)
        return err
    }
    f.permitPlugin = pm

    client, err := f.initApiClient()
    if err != nil {
        f.Error(err)
        return err
    }
    f.apiClient = client

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

    return nil
}

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

    }
    return nil
}

func (f *Fluentd) Charts() *Charts {
    return f.charts
}

func (f *Fluentd) Collect() map[string]int64 {
    mx, err := f.collect()

    if err != nil {
        f.Error(err)
        return nil
    }

    return mx
}

func (f *Fluentd) Cleanup() {
    if f.apiClient != nil && f.apiClient.httpClient != nil {
        f.apiClient.httpClient.CloseIdleConnections()
    }
}