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moby--moby/daemon/stats.go

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package daemon
import (
"encoding/json"
"io"
"github.com/docker/docker/api/types"
"github.com/docker/docker/daemon/execdriver"
"github.com/docker/libnetwork/sandbox"
"github.com/opencontainers/runc/libcontainer"
)
type ContainerStatsConfig struct {
Stream bool
OutStream io.Writer
Stop <-chan bool
}
func (daemon *Daemon) ContainerStats(name string, config *ContainerStatsConfig) error {
updates, err := daemon.SubscribeToContainerStats(name)
if err != nil {
return err
}
if config.Stream {
config.OutStream.Write(nil)
}
var preCpuStats types.CpuStats
getStat := func(v interface{}) *types.Stats {
update := v.(*execdriver.ResourceStats)
// Retrieve the nw statistics from libnetwork and inject them in the Stats
if nwStats, err := daemon.getNetworkStats(name); err == nil {
update.Stats.Interfaces = nwStats
}
ss := convertStatsToAPITypes(update.Stats)
ss.PreCpuStats = preCpuStats
ss.MemoryStats.Limit = uint64(update.MemoryLimit)
ss.Read = update.Read
ss.CpuStats.SystemUsage = update.SystemUsage
preCpuStats = ss.CpuStats
return ss
}
enc := json.NewEncoder(config.OutStream)
defer daemon.UnsubscribeToContainerStats(name, updates)
noStreamFirstFrame := true
for {
select {
case v, ok := <-updates:
if !ok {
return nil
}
s := getStat(v)
if !config.Stream && noStreamFirstFrame {
// prime the cpu stats so they aren't 0 in the final output
noStreamFirstFrame = false
continue
}
if err := enc.Encode(s); err != nil {
return err
}
if !config.Stream {
return nil
}
case <-config.Stop:
return nil
}
}
}
func (daemon *Daemon) getNetworkStats(name string) ([]*libcontainer.NetworkInterface, error) {
var list []*libcontainer.NetworkInterface
c, err := daemon.Get(name)
if err != nil {
return list, err
}
nw, err := daemon.netController.NetworkByID(c.NetworkSettings.NetworkID)
if err != nil {
return list, err
}
ep, err := nw.EndpointByID(c.NetworkSettings.EndpointID)
if err != nil {
return list, err
}
stats, err := ep.Statistics()
if err != nil {
return list, err
}
// Convert libnetwork nw stats into libcontainer nw stats
for ifName, ifStats := range stats {
list = append(list, convertLnNetworkStats(ifName, ifStats))
}
return list, nil
}
func convertLnNetworkStats(name string, stats *sandbox.InterfaceStatistics) *libcontainer.NetworkInterface {
n := &libcontainer.NetworkInterface{Name: name}
n.RxBytes = stats.RxBytes
n.RxPackets = stats.RxPackets
n.RxErrors = stats.RxErrors
n.RxDropped = stats.RxDropped
n.TxBytes = stats.TxBytes
n.TxPackets = stats.TxPackets
n.TxErrors = stats.TxErrors
n.TxDropped = stats.TxDropped
return n
}