netdata/netdata

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

package haproxy

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

func New() *Haproxy {
    return &Haproxy{
        Config: Config{
            HTTP: web.HTTP{
                Request: web.Request{
                    URL: "http://127.0.0.1:8404/metrics",
                },
                Client: web.Client{
                    Timeout: web.Duration(time.Second),
                },
            },
        },

        charts:          charts.Copy(),
        proxies:         make(map[string]bool),
        validateMetrics: true,
    }
}

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

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

    charts *module.Charts

    prom prometheus.Prometheus

    validateMetrics bool
    proxies         map[string]bool
}

func (h *Haproxy) Configuration() any {
    return h.Config
}

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

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

    return nil
}

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

func (h *Haproxy) Charts() *module.Charts {
    return h.charts
}

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

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

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