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moby--moby/daemon/stats.go
Shijiang Wei 1cbf5a54da fix the goroutine leak in the stats API if the container is not running
Signed-off-by: Shijiang Wei <mountkin@gmail.com>
2015-06-23 19:38:15 +08:00

69 lines
1.3 KiB
Go

package daemon
import (
"encoding/json"
"io"
"github.com/docker/docker/api/types"
"github.com/docker/docker/daemon/execdriver"
)
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)
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
}
}
}