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// SPDX-License-Identifier: GPL-3.0-or-later
package sd
import (
"context"
"fmt"
"log/slog"
"sync"
"github.com/netdata/netdata/go/go.d.plugin/agent/confgroup"
"github.com/netdata/netdata/go/go.d.plugin/agent/discovery/sd/pipeline"
"github.com/netdata/netdata/go/go.d.plugin/logger"
"github.com/netdata/netdata/go/go.d.plugin/pkg/multipath"
"gopkg.in/yaml.v2"
)
type Config struct {
ConfigDefaults confgroup.Registry
ConfDir multipath.MultiPath
}
func NewServiceDiscovery(cfg Config) (*ServiceDiscovery, error) {
log := logger.New().With(
slog.String("component", "service discovery"),
)
d := &ServiceDiscovery{
Logger: log,
confProv: newConfFileReader(log, cfg.ConfDir),
configDefaults: cfg.ConfigDefaults,
newPipeline: func(config pipeline.Config) (sdPipeline, error) {
return pipeline.New(config)
},
pipelines: make(map[string]func()),
}
return d, nil
}
type (
ServiceDiscovery struct {
*logger.Logger
confProv confFileProvider
configDefaults confgroup.Registry
newPipeline func(config pipeline.Config) (sdPipeline, error)
pipelines map[string]func()
}
sdPipeline interface {
Run(ctx context.Context, in chan<- []*confgroup.Group)
}
confFileProvider interface {
run(ctx context.Context)
configs() chan confFile
}
)
func (d *ServiceDiscovery) String() string {
return "service discovery"
}
func (d *ServiceDiscovery) Run(ctx context.Context, in chan<- []*confgroup.Group) {
d.Info("instance is started")
defer func() { d.cleanup(); d.Info("instance is stopped") }()
var wg sync.WaitGroup
wg.Add(1)
go func() { defer wg.Done(); d.confProv.run(ctx) }()
wg.Add(1)
go func() { defer wg.Done(); d.run(ctx, in) }()
wg.Wait()
<-ctx.Done()
}
func (d *ServiceDiscovery) run(ctx context.Context, in chan<- []*confgroup.Group) {
for {
select {
case <-ctx.Done():
return
case cfg := <-d.confProv.configs():
if cfg.source == "" {
continue
}
if len(cfg.content) == 0 {
d.removePipeline(cfg)
} else {
d.addPipeline(ctx, cfg, in)
}
}
}
}
func (d *ServiceDiscovery) removePipeline(conf confFile) {
if stop, ok := d.pipelines[conf.source]; ok {
d.Infof("received an empty config, stopping the pipeline ('%s')", conf.source)
delete(d.pipelines, conf.source)
stop()
}
}
func (d *ServiceDiscovery) addPipeline(ctx context.Context, conf confFile, in chan<- []*confgroup.Group) {
var cfg pipeline.Config
if err := yaml.Unmarshal(conf.content, &cfg); err != nil {
d.Error(err)
return
}
if cfg.Disabled {
d.Infof("pipeline config is disabled '%s' (%s)", cfg.Name, cfg.Source)
return
}
cfg.Source = fmt.Sprintf("file=%s", conf.source)
cfg.ConfigDefaults = d.configDefaults
pl, err := d.newPipeline(cfg)
if err != nil {
d.Error(err)
return
}
if stop, ok := d.pipelines[conf.source]; ok {
stop()
}
var wg sync.WaitGroup
plCtx, cancel := context.WithCancel(ctx)
wg.Add(1)
go func() { defer wg.Done(); pl.Run(plCtx, in) }()
stop := func() { cancel(); wg.Wait() }
d.pipelines[conf.source] = stop
}
func (d *ServiceDiscovery) cleanup() {
for _, stop := range d.pipelines {
stop()
}
}
|
