firehol/netdata

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

package traefik

import (
    _ "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/prometheus"
    "github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/web"
)

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

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

func New() *Traefik {
    return &Traefik{
        Config: Config{
            HTTPConfig: web.HTTPConfig{
                RequestConfig: web.RequestConfig{
                    URL: "http://127.0.0.1:8082/metrics",
                },
                ClientConfig: web.ClientConfig{
                    Timeout: confopt.Duration(time.Second),
                },
            },
        },

        charts:       &module.Charts{},
        checkMetrics: true,
        cache: &cache{
            entrypoints: make(map[string]*cacheEntrypoint),
        },
    }
}

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

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

        charts *module.Charts

        prom prometheus.Prometheus

        checkMetrics bool
        cache        *cache
    }
    cache struct {
        entrypoints map[string]*cacheEntrypoint
    }
    cacheEntrypoint struct {
        name, proto     string
        requests        *module.Chart
        reqDur          *module.Chart
        reqDurData      map[string]cacheEntrypointReqDur
        openConn        *module.Chart
        openConnMethods map[string]bool
    }
    cacheEntrypointReqDur struct {
        prev, cur struct{ reqs, secs float64 }
        seen      bool
    }
)

func (t *Traefik) Configuration() any {
    return t.Config
}

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

    prom, err := t.initPrometheusClient()
    if err != nil {
        t.Errorf("prometheus client initialization: %v", err)
        return err
    }
    t.prom = prom

    return nil
}

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

func (t *Traefik) Charts() *module.Charts {
    return t.charts
}

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

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

func (t *Traefik) Cleanup() {}