firehol/netdata

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

package varnish

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"
)

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

func init() {
    module.Register("varnish", module.Creator{
        JobConfigSchema: configSchema,
        Defaults: module.Defaults{
            UpdateEvery: 10,
        },
        Create: func() module.Module { return New() },
        Config: func() any { return &Config{} },
    })
}

func New() *Varnish {
    return &Varnish{
        Config: Config{
            Timeout: confopt.Duration(time.Second * 2),
        },

        seenBackends: make(map[string]bool),
        seenStorages: make(map[string]bool),
        charts:       varnishCharts.Copy(),
    }

}

type Config struct {
    UpdateEvery     int              `yaml:"update_every,omitempty" json:"update_every"`
    Timeout         confopt.Duration `yaml:"timeout,omitempty" json:"timeout"`
    InstanceName    string           `yaml:"instance_name,omitempty" json:"instance_name,omitempty"`
    DockerContainer string           `yaml:"docker_container,omitempty" json:"docker_container,omitempty"`
}

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

    charts *module.Charts

    exec varnishstatBinary

    seenBackends map[string]bool
    seenStorages map[string]bool
}

func (v *Varnish) Configuration() any {
    return v.Config
}

func (v *Varnish) Init() error {
    vs, err := v.initVarnishstatBinary()
    if err != nil {
        v.Errorf("varnishstat exec initialization: %v", err)
        return err
    }
    v.exec = vs

    return nil
}

func (v *Varnish) Check() error {
    mx, err := v.collect()
    if err != nil {
        v.Error(err)
        return err
    }

    if len(mx) == 0 {
        return errors.New("no metrics collected")
    }

    return nil
}

func (v *Varnish) Charts() *module.Charts {
    return v.charts
}

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

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

    return mx
}

func (v *Varnish) Cleanup() {}