firehol/netdata

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

package tomcat

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

func New() *Tomcat {
    return &Tomcat{
        Config: Config{
            HTTPConfig: web.HTTPConfig{
                RequestConfig: web.RequestConfig{
                    URL: "http://127.0.0.1:8080",
                },
                ClientConfig: web.ClientConfig{
                    Timeout: confopt.Duration(time.Second * 1),
                },
            },
        },
        charts:         defaultCharts.Copy(),
        seenConnectors: make(map[string]bool),
        seenMemPools:   make(map[string]bool),
    }
}

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

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

    charts *module.Charts

    httpClient *http.Client

    seenConnectors map[string]bool
    seenMemPools   map[string]bool
}

func (t *Tomcat) Configuration() any {
    return t.Config
}

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

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

    t.httpClient = httpClient

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

    return nil
}

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

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

    return nil
}

func (t *Tomcat) Charts() *module.Charts {
    return t.charts
}

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

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

    return mx
}

func (t *Tomcat) Cleanup() {
    if t.httpClient != nil {
        t.httpClient.CloseIdleConnections()
    }
}