func (p ExamplePlugin) HandleEvent(event *dockerclient.Event) error {
plugins.Log(pluginInfo.Name, log.InfoLevel,
fmt.Sprintf("action=received event=%s time=%d",
event.Id,
event.Time,
),
)
return nil
}
func (p StatsPlugin) startStats(id string) error {
// get container info for event
c, err := p.client.InspectContainer(id)
if err != nil {
return err
}
// match regex to start monitoring
if p.pluginConfig.ImageNameFilter.MatchString(c.Config.Image) {
plugins.Log(pluginInfo.Name, log.DebugLevel,
fmt.Sprintf("gathering stats: image=%s id=%s", c.Image, c.Id[:12]))
go p.handleStats(id, p.sendEventStats, errorChan, nil)
}
return nil
}
func (p StatsPlugin) sendStat(path string, value interface{}, t *time.Time) error {
conn, err := net.Dial("tcp", p.pluginConfig.CarbonAddress)
if err != nil {
return err
}
defer conn.Close()
timestamp := t.Unix()
v := fmt.Sprintf("%s %v %d", path, value, timestamp)
plugins.Log(pluginInfo.Name, log.DebugLevel,
fmt.Sprintf("sending to carbon: %v", v),
)
fmt.Fprintf(conn, "%s\n", v)
return nil
}
func (p StatsPlugin) initialize() error {
containers, err := p.client.ListContainers(false, false, "")
if err != nil {
return err
}
for _, c := range containers {
if err := p.startStats(c.Id); err != nil {
errorChan <- err
}
}
plugins.Log(pluginInfo.Name, log.InfoLevel, fmt.Sprintf("sending stats every %d seconds", p.pluginConfig.Interval))
return nil
}
func (p StatsPlugin) HandleEvent(event *dockerclient.Event) error {
// check all containers to see if stats are needed
if err := p.initialize(); err != nil {
return err
}
t := time.Now()
if err := p.sendStat(p.pluginConfig.StatsPrefix+".cluster.events", 1, &t); err != nil {
plugins.Log(pluginInfo.Name, log.ErrorLevel, err.Error())
}
if event.Status == "start" {
if err := p.startStats(event.Id); err != nil {
return err
}
}
return nil
}
func NewPlugin(interlockConfig *interlock.Config, client *dockerclient.DockerClient) (interlock.Plugin, error) {
p := StatsPlugin{interlockConfig: interlockConfig, client: client}
cfg, err := loadPluginConfig()
if err != nil {
return nil, err
}
p.pluginConfig = cfg
// handle errorChan
go func() {
for {
err := <-errorChan
plugins.Log(pluginInfo.Name,
log.ErrorLevel,
err.Error(),
)
}
}()
return p, nil
}
// Handle sends events on to the Manager
func (l *EventHandler) Handle(e *dockerclient.Event, ec chan error, args ...interface{}) {
plugins.Log("interlock", log.DebugLevel,
fmt.Sprintf("event: date=%d type=%s image=%s container=%s", e.Time, e.Status, e.From, e.Id))
go plugins.DispatchEvent(l.Manager.Config, l.Manager.Client, e, ec)
}
func logMessage(level log.Level, args ...string) {
plugins.Log(pluginInfo.Name, level, args...)
}
func (p StatsPlugin) sendEventStats(id string, stats *dockerclient.Stats, ec chan error, args ...interface{}) {
timestamp := time.Now()
// report every n seconds
rem := math.Mod(float64(timestamp.Second()), float64(p.pluginConfig.Interval))
if rem != 0 {
return
}
if len(id) > 12 {
id = id[:12]
}
cInfo, err := p.client.InspectContainer(id)
if err != nil {
ec <- err
return
}
cName := cInfo.Name[1:]
cNamePath := fmt.Sprintf(cName)
if cInfo.Node.ID != "" {
cNamePath = fmt.Sprintf("nodes.%s.%s", cInfo.Node.Name, cName)
}
statBasePath := p.pluginConfig.StatsPrefix + ".containers." + cNamePath
type containerStat struct {
Key string
Value interface{}
}
memPercent := float64(stats.MemoryStats.Usage) / float64(stats.MemoryStats.Limit) * 100.0
statData := []containerStat{
{
Key: "cpu.totalUsage",
Value: stats.CpuStats.CpuUsage.TotalUsage,
},
{
Key: "cpu.usageInKernelmode",
Value: stats.CpuStats.CpuUsage.UsageInKernelmode,
},
{
Key: "cpu.usageInUsermode",
Value: stats.CpuStats.CpuUsage.UsageInUsermode,
},
{
Key: "memory.usage",
Value: stats.MemoryStats.Usage,
},
{
Key: "memory.maxUsage",
Value: stats.MemoryStats.MaxUsage,
},
{
Key: "memory.failcnt",
Value: stats.MemoryStats.Failcnt,
},
{
Key: "memory.limit",
Value: stats.MemoryStats.Limit,
},
{
Key: "memory.percent",
Value: memPercent,
},
{
Key: "network.rxBytes",
Value: stats.NetworkStats.RxBytes,
},
{
Key: "network.rxPackets",
Value: stats.NetworkStats.RxPackets,
},
{
Key: "network.rxErrors",
Value: stats.NetworkStats.RxErrors,
},
{
Key: "network.rxDropped",
Value: stats.NetworkStats.RxDropped,
},
{
Key: "network.txBytes",
Value: stats.NetworkStats.TxBytes,
},
{
Key: "network.txPackets",
Value: stats.NetworkStats.TxPackets,
},
{
Key: "network.txErrors",
Value: stats.NetworkStats.TxErrors,
},
{
Key: "network.txDropped",
Value: stats.NetworkStats.TxDropped,
},
}
// send every n seconds
for _, s := range statData {
plugins.Log(pluginInfo.Name,
log.DebugLevel,
fmt.Sprintf("stat t=%d id=%s key=%s value=%v",
timestamp.UnixNano(),
id,
s.Key,
s.Value,
),
)
m := fmt.Sprintf("%s.%s", statBasePath, s.Key)
if err := p.sendStat(m, s.Value, ×tamp); err != nil {
ec <- err
}
}
return
}