netdata/netdata

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

package couchdb

import (
    _ "embed"
    "errors"
    "net/http"
    "strings"
    "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("couchdb", module.Creator{
        JobConfigSchema: configSchema,
        Defaults: module.Defaults{
            UpdateEvery: 10,
        },
        Create: func() module.Module { return New() },
        Config: func() any { return &Config{} },
    })
}

func New() *CouchDB {
    return &CouchDB{
        Config: Config{
            HTTP: web.HTTP{
                Request: web.Request{
                    URL: "http://127.0.0.1:5984",
                },
                Client: web.Client{
                    Timeout: web.Duration(time.Second * 2),
                },
            },
            Node: "_local",
        },
    }
}

type Config struct {
    UpdateEvery int `yaml:"update_every,omitempty" json:"update_every"`
    web.HTTP    `yaml:",inline" json:""`
    Node        string `yaml:"node,omitempty" json:"node"`
    Databases   string `yaml:"databases,omitempty" json:"databases"`
}

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

    charts *module.Charts

    httpClient *http.Client

    databases []string
}

func (cdb *CouchDB) Configuration() any {
    return cdb.Config
}

func (cdb *CouchDB) Init() error {
    err := cdb.validateConfig()
    if err != nil {
        cdb.Errorf("check configuration: %v", err)
        return err
    }

    cdb.databases = strings.Fields(cdb.Config.Databases)

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

    charts, err := cdb.initCharts()
    if err != nil {
        cdb.Errorf("init charts: %v", err)
        return err
    }
    cdb.charts = charts

    return nil
}

func (cdb *CouchDB) Check() error {
    if err := cdb.pingCouchDB(); err != nil {
        cdb.Error(err)
        return err
    }

    mx, err := cdb.collect()
    if err != nil {
        cdb.Error(err)
        return err
    }

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

    return nil
}

func (cdb *CouchDB) Charts() *Charts {
    return cdb.charts
}

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

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

func (cdb *CouchDB) Cleanup() {
    if cdb.httpClient == nil {
        return
    }
    cdb.httpClient.CloseIdleConnections()
}