firehol/netdata

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

package wireguard

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

    "github.com/netdata/netdata/go/plugins/plugin/go.d/agent/module"

    "golang.zx2c4.com/wireguard/wgctrl"
    "golang.zx2c4.com/wireguard/wgctrl/wgtypes"
)

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

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

func New() *WireGuard {
    return &WireGuard{
        newWGClient:  func() (wgClient, error) { return wgctrl.New() },
        charts:       &module.Charts{},
        devices:      make(map[string]bool),
        peers:        make(map[string]bool),
        cleanupEvery: time.Minute,
    }
}

type Config struct {
    UpdateEvery int `yaml:"update_every,omitempty" json:"update_every"`
}

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

        charts *module.Charts

        client      wgClient
        newWGClient func() (wgClient, error)

        cleanupLastTime time.Time
        cleanupEvery    time.Duration
        devices         map[string]bool
        peers           map[string]bool
    }
    wgClient interface {
        Devices() ([]*wgtypes.Device, error)
        Close() error
    }
)

func (w *WireGuard) Configuration() any {
    return w.Config
}

func (w *WireGuard) Init() error {
    return nil
}

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

func (w *WireGuard) Charts() *module.Charts {
    return w.charts
}

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

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

func (w *WireGuard) Cleanup() {
    if w.client == nil {
        return
    }
    if err := w.client.Close(); err != nil {
        w.Warningf("cleanup: error on closing connection: %v", err)
    }
    w.client = nil
}