netdata/netdata

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

package apache

import (
    _ "embed"
    "errors"
    "net/http"
    "sync"
    "time"

    "github.com/netdata/netdata/go/go.d.plugin/agent/module"
    "github.com/netdata/netdata/go/go.d.plugin/pkg/web"
)

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

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

func New() *Apache {
    return &Apache{
        Config: Config{
            HTTP: web.HTTP{
                Request: web.Request{
                    URL: "http://127.0.0.1/server-status?auto",
                },
                Client: web.Client{
                    Timeout: web.Duration(time.Second),
                },
            },
        },
        charts: &module.Charts{},
        once:   &sync.Once{},
    }
}

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

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

    charts *module.Charts

    httpClient *http.Client

    once *sync.Once
}

func (a *Apache) Configuration() any {
    return a.Config
}

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

    httpClient, err := a.initHTTPClient()
    if err != nil {
        a.Errorf("init HTTP client: %v", err)
        return err
    }
    a.httpClient = httpClient

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

    return nil
}

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

    }
    return nil
}

func (a *Apache) Charts() *module.Charts {
    return a.charts
}

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

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

func (a *Apache) Cleanup() {
    if a.httpClient != nil {
        a.httpClient.CloseIdleConnections()
    }
}