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package libkpod
import (
"path/filepath"
"syscall"
"time"
"strings"
"github.com/projectatomic/libpod/oci"
"github.com/opencontainers/runc/libcontainer"
)
// ContainerStats contains the statistics information for a running container
type ContainerStats struct {
Container string
CPU float64
cpuNano uint64
systemNano uint64
MemUsage uint64
MemLimit uint64
MemPerc float64
NetInput uint64
NetOutput uint64
BlockInput uint64
BlockOutput uint64
PIDs uint64
}
// GetContainerStats gets the running stats for a given container
func (c *ContainerServer) GetContainerStats(ctr *oci.Container, previousStats *ContainerStats) (*ContainerStats, error) {
previousCPU := previousStats.cpuNano
previousSystem := previousStats.systemNano
libcontainerStats, err := c.LibcontainerStats(ctr)
if err != nil {
return nil, err
}
cgroupStats := libcontainerStats.CgroupStats
stats := new(ContainerStats)
stats.Container = ctr.ID()
stats.CPU = calculateCPUPercent(libcontainerStats, previousCPU, previousSystem)
stats.MemUsage = cgroupStats.MemoryStats.Usage.Usage
stats.MemLimit = getMemLimit(cgroupStats.MemoryStats.Usage.Limit)
stats.MemPerc = float64(stats.MemUsage) / float64(stats.MemLimit)
stats.PIDs = cgroupStats.PidsStats.Current
stats.BlockInput, stats.BlockOutput = calculateBlockIO(libcontainerStats)
stats.NetInput, stats.NetOutput = getContainerNetIO(libcontainerStats)
return stats, nil
}
func loadFactory(root string) (libcontainer.Factory, error) {
abs, err := filepath.Abs(root)
if err != nil {
return nil, err
}
cgroupManager := libcontainer.Cgroupfs
return libcontainer.New(abs, cgroupManager, libcontainer.CriuPath(""))
}
// getMemory limit returns the memory limit for a given cgroup
// If the configured memory limit is larger than the total memory on the sys, the
// physical system memory size is returned
func getMemLimit(cgroupLimit uint64) uint64 {
si := &syscall.Sysinfo_t{}
err := syscall.Sysinfo(si)
if err != nil {
return cgroupLimit
}
physicalLimit := uint64(si.Totalram)
if cgroupLimit > physicalLimit {
return physicalLimit
}
return cgroupLimit
}
// Returns the total number of bytes transmitted and received for the given container stats
func getContainerNetIO(stats *libcontainer.Stats) (received uint64, transmitted uint64) {
for _, iface := range stats.Interfaces {
received += iface.RxBytes
transmitted += iface.TxBytes
}
return
}
func calculateCPUPercent(stats *libcontainer.Stats, previousCPU, previousSystem uint64) float64 {
var (
cpuPercent = 0.0
cpuDelta = float64(stats.CgroupStats.CpuStats.CpuUsage.TotalUsage - previousCPU)
systemDelta = float64(uint64(time.Now().UnixNano()) - previousSystem)
)
if systemDelta > 0.0 && cpuDelta > 0.0 {
// gets a ratio of container cpu usage total, multiplies it by the number of cores (4 cores running
// at 100% utilization should be 400% utilization), and multiplies that by 100 to get a percentage
cpuPercent = (cpuDelta / systemDelta) * float64(len(stats.CgroupStats.CpuStats.CpuUsage.PercpuUsage)) * 100
}
return cpuPercent
}
func calculateBlockIO(stats *libcontainer.Stats) (read uint64, write uint64) {
for _, blkIOEntry := range stats.CgroupStats.BlkioStats.IoServiceBytesRecursive {
switch strings.ToLower(blkIOEntry.Op) {
case "read":
read += blkIOEntry.Value
case "write":
write += blkIOEntry.Value
}
}
return
}
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