94 lines
2.6 KiB
Go
94 lines
2.6 KiB
Go
package task
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import (
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"context"
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"encoding/json"
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"fmt"
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"log"
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dockerTypes "github.com/docker/docker/api/types"
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units "github.com/docker/go-units"
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"github.com/play-with-docker/play-with-docker/docker"
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"github.com/play-with-docker/play-with-docker/event"
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"github.com/play-with-docker/play-with-docker/pwd/types"
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)
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type InstanceStats struct {
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Instance string `json:"instance"`
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Mem string `json:"mem"`
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Cpu string `json:"cpu"`
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}
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type collectStats struct {
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event event.EventApi
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factory docker.FactoryApi
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}
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var CollectStatsEvent event.EventType
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func init() {
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CollectStatsEvent = event.NewEventType("instance stats")
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}
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func (t *collectStats) Name() string {
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return "CollectStats"
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}
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func (t *collectStats) Run(ctx context.Context, instance *types.Instance) error {
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dockerClient, err := t.factory.GetForSession(instance.SessionId)
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if err != nil {
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log.Println(err)
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return err
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}
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reader, err := dockerClient.GetContainerStats(instance.Name)
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if err != nil {
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log.Println("Error while trying to collect instance stats", err)
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return err
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}
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dec := json.NewDecoder(reader)
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var v *dockerTypes.StatsJSON
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e := dec.Decode(&v)
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if e != nil {
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log.Println("Error while trying to collect instance stats", e)
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return err
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}
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stats := InstanceStats{Instance: instance.Name}
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// Memory
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var memPercent float64 = 0
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if v.MemoryStats.Limit != 0 {
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memPercent = float64(v.MemoryStats.Usage) / float64(v.MemoryStats.Limit) * 100.0
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}
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mem := float64(v.MemoryStats.Usage)
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memLimit := float64(v.MemoryStats.Limit)
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stats.Mem = fmt.Sprintf("%.2f%% (%s / %s)", memPercent, units.BytesSize(mem), units.BytesSize(memLimit))
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// cpu
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previousCPU := v.PreCPUStats.CPUUsage.TotalUsage
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previousSystem := v.PreCPUStats.SystemUsage
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cpuPercent := calculateCPUPercentUnix(previousCPU, previousSystem, v)
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stats.Cpu = fmt.Sprintf("%.2f%%", cpuPercent)
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t.event.Emit(CollectStatsEvent, instance.SessionId, stats)
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return nil
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}
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func NewCollectStats(e event.EventApi, f docker.FactoryApi) *collectStats {
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return &collectStats{event: e, factory: f}
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}
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func calculateCPUPercentUnix(previousCPU, previousSystem uint64, v *dockerTypes.StatsJSON) float64 {
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var (
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cpuPercent = 0.0
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// calculate the change for the cpu usage of the container in between readings
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cpuDelta = float64(v.CPUStats.CPUUsage.TotalUsage) - float64(previousCPU)
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// calculate the change for the entire system between readings
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systemDelta = float64(v.CPUStats.SystemUsage) - float64(previousSystem)
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)
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if systemDelta > 0.0 && cpuDelta > 0.0 {
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cpuPercent = (cpuDelta / systemDelta) * float64(len(v.CPUStats.CPUUsage.PercpuUsage)) * 100.0
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}
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return cpuPercent
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}
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