a8313441d1
(cherry picked from commit f6fa56194f)
Signed-off-by: Xinfeng Liu <XinfengLiu@icloud.com>
121 lines
3.3 KiB
Go
121 lines
3.3 KiB
Go
//go:build !windows
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// +build !windows
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package daemon // import "github.com/docker/docker/daemon"
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import (
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"bufio"
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"fmt"
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"os"
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"strconv"
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"strings"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/container"
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"github.com/pkg/errors"
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)
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// Resolve Network SandboxID in case the container reuse another container's network stack
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func (daemon *Daemon) getNetworkSandboxID(c *container.Container) (string, error) {
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curr := c
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for curr.HostConfig.NetworkMode.IsContainer() {
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containerID := curr.HostConfig.NetworkMode.ConnectedContainer()
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connected, err := daemon.GetContainer(containerID)
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if err != nil {
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return "", errors.Wrapf(err, "Could not get container for %s", containerID)
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}
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curr = connected
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}
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return curr.NetworkSettings.SandboxID, nil
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}
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func (daemon *Daemon) getNetworkStats(c *container.Container) (map[string]types.NetworkStats, error) {
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sandboxID, err := daemon.getNetworkSandboxID(c)
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if err != nil {
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return nil, err
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}
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sb, err := daemon.netController.SandboxByID(sandboxID)
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if err != nil {
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return nil, err
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}
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lnstats, err := sb.Statistics()
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if err != nil {
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return nil, err
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}
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stats := make(map[string]types.NetworkStats)
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// Convert libnetwork nw stats into api stats
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for ifName, ifStats := range lnstats {
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stats[ifName] = types.NetworkStats{
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RxBytes: ifStats.RxBytes,
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RxPackets: ifStats.RxPackets,
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RxErrors: ifStats.RxErrors,
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RxDropped: ifStats.RxDropped,
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TxBytes: ifStats.TxBytes,
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TxPackets: ifStats.TxPackets,
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TxErrors: ifStats.TxErrors,
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TxDropped: ifStats.TxDropped,
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}
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}
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return stats, nil
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}
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const (
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// The value comes from `C.sysconf(C._SC_CLK_TCK)`, and
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// on Linux it's a constant which is safe to be hard coded,
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// so we can avoid using cgo here. For details, see:
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// https://github.com/containerd/cgroups/pull/12
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clockTicksPerSecond = 100
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nanoSecondsPerSecond = 1e9
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)
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// getSystemCPUUsage returns the host system's cpu usage in
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// nanoseconds and number of online CPUs. An error is returned
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// if the format of the underlying file does not match.
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//
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// Uses /proc/stat defined by POSIX. Looks for the cpu
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// statistics line and then sums up the first seven fields
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// provided. See `man 5 proc` for details on specific field
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// information.
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func getSystemCPUUsage() (cpuUsage uint64, cpuNum uint32, err error) {
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f, err := os.Open("/proc/stat")
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if err != nil {
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return 0, 0, err
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}
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defer f.Close()
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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line := scanner.Text()
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if len(line) < 4 || line[:3] != "cpu" {
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break // Assume all cpu* records are at the front, like glibc https://github.com/bminor/glibc/blob/5d00c201b9a2da768a79ea8d5311f257871c0b43/sysdeps/unix/sysv/linux/getsysstats.c#L108-L135
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}
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if line[3] == ' ' {
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parts := strings.Fields(line)
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if len(parts) < 8 {
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return 0, 0, fmt.Errorf("invalid number of cpu fields")
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}
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var totalClockTicks uint64
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for _, i := range parts[1:8] {
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v, err := strconv.ParseUint(i, 10, 64)
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if err != nil {
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return 0, 0, fmt.Errorf("Unable to convert value %s to int: %w", i, err)
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}
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totalClockTicks += v
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}
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cpuUsage = (totalClockTicks * nanoSecondsPerSecond) /
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clockTicksPerSecond
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}
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if '0' <= line[3] && line[3] <= '9' {
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cpuNum++
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}
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}
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if err := scanner.Err(); err != nil {
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return 0, 0, fmt.Errorf("error scanning '/proc/stat' file: %w", err)
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}
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return
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}
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