firehol/netdata

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

package nginxplus

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

func New() *NginxPlus {
    return &NginxPlus{
        Config: Config{
            HTTPConfig: web.HTTPConfig{
                RequestConfig: web.RequestConfig{
                    URL: "http://127.0.0.1",
                },
                ClientConfig: web.ClientConfig{
                    Timeout: confopt.Duration(time.Second * 1),
                },
            },
        },
        charts:              baseCharts.Copy(),
        queryEndpointsEvery: time.Minute,
        cache:               newCache(),
    }
}

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

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

    charts *module.Charts

    httpClient *http.Client

    apiVersion int64
    endpoints  struct {
        nginx             bool
        connections       bool
        ssl               bool
        httpCaches        bool
        httpRequest       bool
        httpServerZones   bool
        httpLocationZones bool
        httpUpstreams     bool
        streamServerZones bool
        streamUpstreams   bool
        resolvers         bool
    }
    queryEndpointsTime  time.Time
    queryEndpointsEvery time.Duration
    cache               *cache
}

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

func (n *NginxPlus) Init() error {
    if n.URL == "" {
        n.Error("config validation: 'url' can not be empty'")
        return errors.New("url not set")
    }

    client, err := web.NewHTTPClient(n.ClientConfig)
    if err != nil {
        n.Errorf("init HTTP client: %v", err)
        return err
    }
    n.httpClient = client

    return nil
}

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

func (n *NginxPlus) Collect() map[string]int64 {
    mx, err := n.collect()

    if err != nil {
        n.Error(err)
        return nil
    }

    return mx
}

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