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// SPDX-License-Identifier: GPL-3.0-or-later
package dockerd
import (
"context"
"fmt"
"log/slog"
"net"
"strconv"
"strings"
"time"
"github.com/netdata/netdata/go/go.d.plugin/agent/discovery/sd/model"
"github.com/netdata/netdata/go/go.d.plugin/logger"
"github.com/netdata/netdata/go/go.d.plugin/pkg/web"
"github.com/docker/docker/api/types"
typesContainer "github.com/docker/docker/api/types/container"
docker "github.com/docker/docker/client"
"github.com/ilyam8/hashstructure"
)
func NewDiscoverer(cfg Config) (*Discoverer, error) {
tags, err := model.ParseTags(cfg.Tags)
if err != nil {
return nil, fmt.Errorf("parse tags: %v", err)
}
d := &Discoverer{
Logger: logger.New().With(
slog.String("component", "service discovery"),
slog.String("discoverer", "docker"),
),
cfgSource: cfg.Source,
newDockerClient: func(addr string) (dockerClient, error) {
return docker.NewClientWithOpts(docker.WithHost(addr))
},
addr: docker.DefaultDockerHost,
listInterval: time.Second * 60,
timeout: time.Second * 2,
seenTggSources: make(map[string]bool),
started: make(chan struct{}),
}
d.Tags().Merge(tags)
if cfg.Timeout.Duration().Seconds() != 0 {
d.timeout = cfg.Timeout.Duration()
}
if cfg.Address != "" {
d.addr = cfg.Address
}
return d, nil
}
type Config struct {
Source string
Tags string `yaml:"tags"`
Address string `yaml:"address"`
Timeout web.Duration `yaml:"timeout"`
}
type (
Discoverer struct {
*logger.Logger
model.Base
dockerClient dockerClient
newDockerClient func(addr string) (dockerClient, error)
addr string
cfgSource string
listInterval time.Duration
timeout time.Duration
seenTggSources map[string]bool // [targetGroup.Source]
started chan struct{}
}
dockerClient interface {
NegotiateAPIVersion(context.Context)
ContainerList(context.Context, typesContainer.ListOptions) ([]types.Container, error)
Close() error
}
)
func (d *Discoverer) String() string {
return "sd:docker"
}
func (d *Discoverer) Discover(ctx context.Context, in chan<- []model.TargetGroup) {
d.Info("instance is started")
defer func() { d.cleanup(); d.Info("instance is stopped") }()
close(d.started)
if d.dockerClient == nil {
client, err := d.newDockerClient(d.addr)
if err != nil {
d.Errorf("error on creating docker client: %v", err)
return
}
d.dockerClient = client
}
d.dockerClient.NegotiateAPIVersion(ctx)
if err := d.listContainers(ctx, in); err != nil {
d.Error(err)
return
}
tk := time.NewTicker(d.listInterval)
defer tk.Stop()
for {
select {
case <-ctx.Done():
return
case <-tk.C:
if err := d.listContainers(ctx, in); err != nil {
d.Warning(err)
}
}
}
}
func (d *Discoverer) listContainers(ctx context.Context, in chan<- []model.TargetGroup) error {
listCtx, cancel := context.WithTimeout(ctx, d.timeout)
defer cancel()
containers, err := d.dockerClient.ContainerList(listCtx, typesContainer.ListOptions{})
if err != nil {
return err
}
var tggs []model.TargetGroup
seen := make(map[string]bool)
for _, cntr := range containers {
if tgg := d.buildTargetGroup(cntr); tgg != nil {
tggs = append(tggs, tgg)
seen[tgg.Source()] = true
}
}
for src := range d.seenTggSources {
if !seen[src] {
tggs = append(tggs, &targetGroup{source: src})
}
}
d.seenTggSources = seen
select {
case <-ctx.Done():
case in <- tggs:
}
return nil
}
func (d *Discoverer) buildTargetGroup(cntr types.Container) model.TargetGroup {
if len(cntr.Names) == 0 || cntr.NetworkSettings == nil || len(cntr.NetworkSettings.Networks) == 0 {
return nil
}
tgg := &targetGroup{
source: cntrSource(cntr),
}
if d.cfgSource != "" {
tgg.source += fmt.Sprintf(",%s", d.cfgSource)
}
for netDriver, network := range cntr.NetworkSettings.Networks {
// container with network mode host will be discovered by local-listeners
for _, port := range cntr.Ports {
tgt := &target{
ID: cntr.ID,
Name: strings.TrimPrefix(cntr.Names[0], "/"),
Image: cntr.Image,
Command: cntr.Command,
Labels: mapAny(cntr.Labels),
PrivatePort: strconv.Itoa(int(port.PrivatePort)),
PublicPort: strconv.Itoa(int(port.PublicPort)),
PublicPortIP: port.IP,
PortProtocol: port.Type,
NetworkMode: cntr.HostConfig.NetworkMode,
NetworkDriver: netDriver,
IPAddress: network.IPAddress,
}
tgt.Address = net.JoinHostPort(tgt.IPAddress, tgt.PrivatePort)
hash, err := calcHash(tgt)
if err != nil {
continue
}
tgt.hash = hash
tgt.Tags().Merge(d.Tags())
tgg.targets = append(tgg.targets, tgt)
}
}
return tgg
}
func (d *Discoverer) cleanup() {
if d.dockerClient != nil {
_ = d.dockerClient.Close()
}
}
func cntrSource(cntr types.Container) string {
name := strings.TrimPrefix(cntr.Names[0], "/")
return fmt.Sprintf("discoverer=docker,container=%s,image=%s", name, cntr.Image)
}
func calcHash(obj any) (uint64, error) {
return hashstructure.Hash(obj, nil)
}
func mapAny(src map[string]string) map[string]any {
if src == nil {
return nil
}
m := make(map[string]any, len(src))
for k, v := range src {
m[k] = v
}
return m
}
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