firehol/netdata

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

package nginxunit

import (
    _ "embed"
    "errors"
    "fmt"
    "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("nginxunit", module.Creator{
        JobConfigSchema: configSchema,
        Create:          func() module.Module { return New() },
        Config:          func() any { return &Config{} },
    })
}

func New() *NginxUnit {
    return &NginxUnit{
        Config: Config{
            HTTPConfig: web.HTTPConfig{
                RequestConfig: web.RequestConfig{
                    URL: "http://127.0.0.1:8000",
                },
                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 NginxUnit struct {
    module.Base
    Config `yaml:",inline" json:""`

    charts *module.Charts

    httpClient *http.Client
}

func (n *NginxUnit) Configuration() any {
    return n.Config
}

func (n *NginxUnit) Init() error {
    if n.URL == "" {
        return errors.New("URL required but not set")
    }

    httpClient, err := web.NewHTTPClient(n.ClientConfig)
    if err != nil {
        return fmt.Errorf("failed initializing http client: %w", err)
    }
    n.httpClient = httpClient

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

    return nil
}

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

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

    return nil
}

func (n *NginxUnit) Charts() *module.Charts {
    return n.charts
}

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

    return mx
}

func (n *NginxUnit) Cleanup() {
    if n.httpClient != nil {
        n.httpClient.CloseIdleConnections()
    }
}