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metricbeat.go
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/
metricbeat.go
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package beater
import (
"sync"
"github.com/elastic/beats/libbeat/beat"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/libbeat/publisher"
"github.com/elastic/beats/metricbeat/mb"
"github.com/elastic/beats/metricbeat/mb/module"
"github.com/elastic/beats/libbeat/cfgfile"
"github.com/pkg/errors"
)
// Metricbeat implements the Beater interface for metricbeat.
type Metricbeat struct {
done chan struct{} // Channel used to initiate shutdown.
modules []*module.Wrapper // Active list of modules.
client publisher.Client // Publisher client.
config Config
}
// New creates and returns a new Metricbeat instance.
func New(b *beat.Beat, rawConfig *common.Config) (beat.Beater, error) {
// List all registered modules and metricsets.
logp.Info("%s", mb.Registry.String())
config := Config{}
err := rawConfig.Unpack(&config)
if err != nil {
return nil, errors.Wrap(err, "error reading configuration file")
}
modules, err := module.NewWrappers(config.Modules, mb.Registry)
if err != nil {
// Empty config is fine if dynamic config is enabled
if !config.ReloadModules.Enabled() {
return nil, err
} else if err != mb.ErrEmptyConfig && err != mb.ErrAllModulesDisabled {
return nil, err
}
}
mb := &Metricbeat{
done: make(chan struct{}),
modules: modules,
config: config,
}
return mb, nil
}
// Run starts the workers for Metricbeat and blocks until Stop is called
// and the workers complete. Each host associated with a MetricSet is given its
// own goroutine for fetching data. The ensures that each host is isolated so
// that a single unresponsive host cannot inadvertently block other hosts
// within the same Module and MetricSet from collection.
func (bt *Metricbeat) Run(b *beat.Beat) error {
var wg sync.WaitGroup
for _, m := range bt.modules {
r := module.NewRunner(b.Publisher.Connect, m)
r.Start()
wg.Add(1)
go func() {
defer wg.Done()
<-bt.done
r.Stop()
}()
}
if bt.config.ReloadModules.Enabled() {
logp.Warn("EXPERIMENTAL feature dynamic configuration reloading is enabled.")
moduleReloader := cfgfile.NewReloader(bt.config.ReloadModules)
factory := module.NewFactory(b.Publisher)
go moduleReloader.Run(factory)
wg.Add(1)
go func() {
defer wg.Done()
<-bt.done
moduleReloader.Stop()
}()
}
wg.Wait()
return nil
}
// Stop signals to Metricbeat that it should stop. It closes the "done" channel
// and closes the publisher client associated with each Module.
//
// Stop should only be called a single time. Calling it more than once may
// result in undefined behavior.
func (bt *Metricbeat) Stop() {
close(bt.done)
}