firehol/netdata

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

package docker_engine

import (
    _ "embed"
    "errors"
    "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/prometheus"
    "github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/web"
)

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

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

func New() *DockerEngine {
    return &DockerEngine{
        Config: Config{
            HTTPConfig: web.HTTPConfig{
                RequestConfig: web.RequestConfig{
                    URL: "http://127.0.0.1:9323/metrics",
                },
                ClientConfig: web.ClientConfig{
                    Timeout: confopt.Duration(time.Second),
                },
            },
        },
    }
}

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

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

    prom prometheus.Prometheus

    isSwarmManager     bool
    hasContainerStates bool
}

func (de *DockerEngine) Configuration() any {
    return de.Config
}

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

    prom, err := de.initPrometheusClient()
    if err != nil {
        de.Error(err)
        return err
    }
    de.prom = prom

    return nil
}

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

    }
    return nil
}

func (de *DockerEngine) Charts() *Charts {
    cs := charts.Copy()
    if !de.hasContainerStates {
        if err := cs.Remove("engine_daemon_container_states_containers"); err != nil {
            de.Warning(err)
        }
    }

    if !de.isSwarmManager {
        return cs
    }

    if err := cs.Add(*swarmManagerCharts.Copy()...); err != nil {
        de.Warning(err)
    }

    return cs
}

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

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

func (de *DockerEngine) Cleanup() {
    if de.prom != nil && de.prom.HTTPClient() != nil {
        de.prom.HTTPClient().CloseIdleConnections()
    }
}