firehol/netdata

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

package squid

import (
    _ "embed"
    "errors"
    "net/http"
    "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/web"
)

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

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

func New() *Squid {
    return &Squid{
        Config: Config{
            HTTPConfig: web.HTTPConfig{
                RequestConfig: web.RequestConfig{
                    URL: "http://127.0.0.1:3128",
                },
                ClientConfig: web.ClientConfig{
                    Timeout: confopt.Duration(time.Second * 1),
                },
            },
        },
        charts: charts.Copy(),
    }
}

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

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

    charts *module.Charts

    httpClient *http.Client
}

func (s *Squid) Configuration() any {
    return s.Config
}

func (s *Squid) Init() error {
    if s.URL == "" {
        s.Error("URL not set")
        return errors.New("url not set")
    }

    client, err := web.NewHTTPClient(s.ClientConfig)
    if err != nil {
        s.Error(err)
        return err
    }
    s.httpClient = client

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

    return nil
}

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

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

    return nil
}

func (s *Squid) Charts() *module.Charts {
    return s.charts
}

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

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

    return mx
}

func (s *Squid) Cleanup() {
    if s.httpClient != nil {
        s.httpClient.CloseIdleConnections()
    }
}