124 lines
3 KiB
Go
124 lines
3 KiB
Go
package daemon
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import (
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"encoding/json"
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"io"
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"github.com/docker/docker/daemon/execdriver"
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"github.com/docker/docker/pkg/version"
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"github.com/docker/engine-api/types"
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"github.com/docker/engine-api/types/versions/v1p20"
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)
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// ContainerStatsConfig holds information for configuring the runtime
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// behavior of a daemon.ContainerStats() call.
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type ContainerStatsConfig struct {
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Stream bool
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OutStream io.Writer
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Stop <-chan bool
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Version version.Version
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}
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// ContainerStats writes information about the container to the stream
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// given in the config object.
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func (daemon *Daemon) ContainerStats(prefixOrName string, config *ContainerStatsConfig) error {
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container, err := daemon.GetContainer(prefixOrName)
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if err != nil {
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return err
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}
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// If the container is not running and requires no stream, return an empty stats.
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if !container.IsRunning() && !config.Stream {
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return json.NewEncoder(config.OutStream).Encode(&types.Stats{})
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}
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if config.Stream {
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// Write an empty chunk of data.
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// This is to ensure that the HTTP status code is sent immediately,
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// even if the container has not yet produced any data.
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config.OutStream.Write(nil)
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}
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var preCPUStats types.CPUStats
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getStatJSON := func(v interface{}) *types.StatsJSON {
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update := v.(*execdriver.ResourceStats)
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ss := convertStatsToAPITypes(update.Stats)
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ss.PreCPUStats = preCPUStats
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ss.MemoryStats.Limit = uint64(update.MemoryLimit)
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ss.Read = update.Read
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ss.CPUStats.SystemUsage = update.SystemUsage
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preCPUStats = ss.CPUStats
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return ss
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}
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enc := json.NewEncoder(config.OutStream)
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updates := daemon.subscribeToContainerStats(container)
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defer daemon.unsubscribeToContainerStats(container, updates)
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noStreamFirstFrame := true
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for {
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select {
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case v, ok := <-updates:
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if !ok {
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return nil
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}
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var statsJSON interface{}
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statsJSONPost120 := getStatJSON(v)
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if config.Version.LessThan("1.21") {
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var (
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rxBytes uint64
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rxPackets uint64
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rxErrors uint64
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rxDropped uint64
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txBytes uint64
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txPackets uint64
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txErrors uint64
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txDropped uint64
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)
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for _, v := range statsJSONPost120.Networks {
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rxBytes += v.RxBytes
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rxPackets += v.RxPackets
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rxErrors += v.RxErrors
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rxDropped += v.RxDropped
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txBytes += v.TxBytes
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txPackets += v.TxPackets
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txErrors += v.TxErrors
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txDropped += v.TxDropped
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}
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statsJSON = &v1p20.StatsJSON{
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Stats: statsJSONPost120.Stats,
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Network: types.NetworkStats{
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RxBytes: rxBytes,
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RxPackets: rxPackets,
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RxErrors: rxErrors,
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RxDropped: rxDropped,
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TxBytes: txBytes,
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TxPackets: txPackets,
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TxErrors: txErrors,
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TxDropped: txDropped,
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},
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}
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} else {
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statsJSON = statsJSONPost120
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}
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if !config.Stream && noStreamFirstFrame {
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// prime the cpu stats so they aren't 0 in the final output
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noStreamFirstFrame = false
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continue
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}
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if err := enc.Encode(statsJSON); err != nil {
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return err
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}
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if !config.Stream {
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return nil
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}
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case <-config.Stop:
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return nil
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}
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}
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}
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