forked from Ingensi/dockbeat
/
dockerbeat.go
127 lines (103 loc) · 2.9 KB
/
dockerbeat.go
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package main
import (
"time"
"github.com/elastic/beats/libbeat/beat"
"github.com/elastic/beats/libbeat/cfgfile"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/libbeat/publisher"
"github.com/fsouza/go-dockerclient"
)
type Dockerbeat struct {
isAlive bool
period time.Duration
socket string
TbConfig ConfigSettings
dockerClient *docker.Client
events publisher.Client
eventGenerator EventGenerator
}
func (d *Dockerbeat) Config(b *beat.Beat) error {
err := cfgfile.Read(&d.TbConfig, "")
if err != nil {
logp.Err("Error reading configuration file: %v", err)
return err
}
//init the period
if d.TbConfig.Input.Period != nil {
d.period = time.Duration(*d.TbConfig.Input.Period) * time.Second
} else {
d.period = 1 * time.Second
}
//init the socket
if d.TbConfig.Input.Socket != nil {
d.socket = *d.TbConfig.Input.Socket
} else {
d.socket = "unix:///var/run/docker.sock" // default docker socket location
}
logp.Debug("dockerbeat", "Init dockerbeat")
logp.Debug("dockerbeat", "Follow docker socket %q\n", d.socket)
logp.Debug("dockerbeat", "Period %v\n", d.period)
return nil
}
func (d *Dockerbeat) Setup(b *beat.Beat) error {
//populate Dockerbeat
d.events = b.Events
d.dockerClient, _ = docker.NewClient(d.socket)
d.eventGenerator = EventGenerator{map[string]NetworkData{}}
return nil
}
func (d *Dockerbeat) Run(b *beat.Beat) error {
d.isAlive = true
var err error
//main loop
for d.isAlive {
time.Sleep(d.period)
d.RunOneTime(b)
}
return err
}
func (d *Dockerbeat) Cleanup(b *beat.Beat) error {
return nil
}
func (d *Dockerbeat) Stop() {
d.isAlive = false
}
func (d *Dockerbeat) RunOneTime(b *beat.Beat) error {
containers, err := d.dockerClient.ListContainers(docker.ListContainersOptions{})
if err == nil {
//export stats for each container
for _, container := range containers {
d.exportContainerStats(container)
}
} else {
logp.Err("Cannot get container list: %d", err)
}
d.eventGenerator.cleanOldStats(containers)
return nil
}
func (d *Dockerbeat) exportContainerStats(container docker.APIContainers) error {
// statsOptions creation
statsC := make(chan *docker.Stats)
done := make(chan bool)
errC := make(chan error, 1)
// the stream bool is set to false to only listen the first stats
statsOptions := docker.StatsOptions{container.ID, statsC, false, done, -1}
// goroutine to listen to the stats
go func() {
errC <- d.dockerClient.Stats(statsOptions)
close(errC)
}()
// goroutine to get the stats & publish it
go func() {
stats := <-statsC
events := []common.MapStr{
d.eventGenerator.getContainerEvent(&container, stats),
d.eventGenerator.getCPUEvent(&container, stats),
d.eventGenerator.getMemoryEvent(&container, stats),
d.eventGenerator.getNetworkEvent(&container, stats),
}
d.events.PublishEvents(events)
}()
return nil
}