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moby--moby/integration-cli/docker_api_stats_test.go

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package main
import (
"encoding/json"
"fmt"
"net/http"
"os/exec"
"runtime"
"strconv"
"strings"
"sync"
"time"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/versions"
"github.com/docker/docker/client"
"github.com/docker/docker/integration-cli/checker"
"github.com/docker/docker/integration-cli/request"
"github.com/go-check/check"
"golang.org/x/net/context"
)
var expectedNetworkInterfaceStats = strings.Split("rx_bytes rx_dropped rx_errors rx_packets tx_bytes tx_dropped tx_errors tx_packets", " ")
func (s *DockerSuite) TestAPIStatsNoStreamGetCpu(c *check.C) {
out, _ := dockerCmd(c, "run", "-d", "busybox", "/bin/sh", "-c", "while true;usleep 100; do echo 'Hello'; done")
id := strings.TrimSpace(out)
c.Assert(waitRun(id), checker.IsNil)
resp, body, err := request.Get(fmt.Sprintf("/containers/%s/stats?stream=false", id))
c.Assert(err, checker.IsNil)
c.Assert(resp.StatusCode, checker.Equals, http.StatusOK)
c.Assert(resp.Header.Get("Content-Type"), checker.Equals, "application/json")
var v *types.Stats
err = json.NewDecoder(body).Decode(&v)
c.Assert(err, checker.IsNil)
body.Close()
var cpuPercent = 0.0
if testEnv.DaemonPlatform() != "windows" {
cpuDelta := float64(v.CPUStats.CPUUsage.TotalUsage - v.PreCPUStats.CPUUsage.TotalUsage)
systemDelta := float64(v.CPUStats.SystemUsage - v.PreCPUStats.SystemUsage)
cpuPercent = (cpuDelta / systemDelta) * float64(len(v.CPUStats.CPUUsage.PercpuUsage)) * 100.0
} else {
// Max number of 100ns intervals between the previous time read and now
possIntervals := uint64(v.Read.Sub(v.PreRead).Nanoseconds()) // Start with number of ns intervals
possIntervals /= 100 // Convert to number of 100ns intervals
possIntervals *= uint64(v.NumProcs) // Multiple by the number of processors
// Intervals used
intervalsUsed := v.CPUStats.CPUUsage.TotalUsage - v.PreCPUStats.CPUUsage.TotalUsage
// Percentage avoiding divide-by-zero
if possIntervals > 0 {
cpuPercent = float64(intervalsUsed) / float64(possIntervals) * 100.0
}
}
c.Assert(cpuPercent, check.Not(checker.Equals), 0.0, check.Commentf("docker stats with no-stream get cpu usage failed: was %v", cpuPercent))
}
func (s *DockerSuite) TestAPIStatsStoppedContainerInGoroutines(c *check.C) {
out, _ := dockerCmd(c, "run", "-d", "busybox", "/bin/sh", "-c", "echo 1")
id := strings.TrimSpace(out)
getGoRoutines := func() int {
_, body, err := request.Get(fmt.Sprintf("/info"))
c.Assert(err, checker.IsNil)
info := types.Info{}
err = json.NewDecoder(body).Decode(&info)
c.Assert(err, checker.IsNil)
body.Close()
return info.NGoroutines
}
// When the HTTP connection is closed, the number of goroutines should not increase.
routines := getGoRoutines()
_, body, err := request.Get(fmt.Sprintf("/containers/%s/stats", id))
c.Assert(err, checker.IsNil)
body.Close()
t := time.After(30 * time.Second)
for {
select {
case <-t:
c.Assert(getGoRoutines(), checker.LessOrEqualThan, routines)
return
default:
if n := getGoRoutines(); n <= routines {
return
}
time.Sleep(200 * time.Millisecond)
}
}
}
func (s *DockerSuite) TestAPIStatsNetworkStats(c *check.C) {
testRequires(c, SameHostDaemon)
out := runSleepingContainer(c)
id := strings.TrimSpace(out)
c.Assert(waitRun(id), checker.IsNil)
// Retrieve the container address
net := "bridge"
if testEnv.DaemonPlatform() == "windows" {
net = "nat"
}
contIP := findContainerIP(c, id, net)
numPings := 1
var preRxPackets uint64
var preTxPackets uint64
var postRxPackets uint64
var postTxPackets uint64
// Get the container networking stats before and after pinging the container
nwStatsPre := getNetworkStats(c, id)
for _, v := range nwStatsPre {
preRxPackets += v.RxPackets
preTxPackets += v.TxPackets
}
countParam := "-c"
if runtime.GOOS == "windows" {
countParam = "-n" // Ping count parameter is -n on Windows
}
pingout, err := exec.Command("ping", contIP, countParam, strconv.Itoa(numPings)).CombinedOutput()
if err != nil && runtime.GOOS == "linux" {
// If it fails then try a work-around, but just for linux.
// If this fails too then go back to the old error for reporting.
//
// The ping will sometimes fail due to an apparmor issue where it
// denies access to the libc.so.6 shared library - running it
// via /lib64/ld-linux-x86-64.so.2 seems to work around it.
pingout2, err2 := exec.Command("/lib64/ld-linux-x86-64.so.2", "/bin/ping", contIP, "-c", strconv.Itoa(numPings)).CombinedOutput()
if err2 == nil {
pingout = pingout2
err = err2
}
}
c.Assert(err, checker.IsNil)
pingouts := string(pingout[:])
nwStatsPost := getNetworkStats(c, id)
for _, v := range nwStatsPost {
postRxPackets += v.RxPackets
postTxPackets += v.TxPackets
}
// Verify the stats contain at least the expected number of packets
// On Linux, account for ARP.
expRxPkts := preRxPackets + uint64(numPings)
expTxPkts := preTxPackets + uint64(numPings)
if testEnv.DaemonPlatform() != "windows" {
expRxPkts++
expTxPkts++
}
c.Assert(postTxPackets, checker.GreaterOrEqualThan, expTxPkts,
check.Commentf("Reported less TxPackets than expected. Expected >= %d. Found %d. %s", expTxPkts, postTxPackets, pingouts))
c.Assert(postRxPackets, checker.GreaterOrEqualThan, expRxPkts,
check.Commentf("Reported less RxPackets than expected. Expected >= %d. Found %d. %s", expRxPkts, postRxPackets, pingouts))
}
func (s *DockerSuite) TestAPIStatsNetworkStatsVersioning(c *check.C) {
// Windows doesn't support API versions less than 1.25, so no point testing 1.17 .. 1.21
testRequires(c, SameHostDaemon, DaemonIsLinux)
out := runSleepingContainer(c)
id := strings.TrimSpace(out)
c.Assert(waitRun(id), checker.IsNil)
wg := sync.WaitGroup{}
for i := 17; i <= 21; i++ {
wg.Add(1)
go func(i int) {
defer wg.Done()
apiVersion := fmt.Sprintf("v1.%d", i)
statsJSONBlob := getVersionedStats(c, id, apiVersion)
if versions.LessThan(apiVersion, "v1.21") {
c.Assert(jsonBlobHasLTv121NetworkStats(statsJSONBlob), checker.Equals, true,
check.Commentf("Stats JSON blob from API %s %#v does not look like a <v1.21 API stats structure", apiVersion, statsJSONBlob))
} else {
c.Assert(jsonBlobHasGTE121NetworkStats(statsJSONBlob), checker.Equals, true,
check.Commentf("Stats JSON blob from API %s %#v does not look like a >=v1.21 API stats structure", apiVersion, statsJSONBlob))
}
}(i)
}
wg.Wait()
}
func getNetworkStats(c *check.C, id string) map[string]types.NetworkStats {
var st *types.StatsJSON
_, body, err := request.Get(fmt.Sprintf("/containers/%s/stats?stream=false", id))
c.Assert(err, checker.IsNil)
err = json.NewDecoder(body).Decode(&st)
c.Assert(err, checker.IsNil)
body.Close()
return st.Networks
}
// getVersionedStats returns stats result for the
// container with id using an API call with version apiVersion. Since the
// stats result type differs between API versions, we simply return
// map[string]interface{}.
func getVersionedStats(c *check.C, id string, apiVersion string) map[string]interface{} {
stats := make(map[string]interface{})
_, body, err := request.Get(fmt.Sprintf("/%s/containers/%s/stats?stream=false", apiVersion, id))
c.Assert(err, checker.IsNil)
defer body.Close()
err = json.NewDecoder(body).Decode(&stats)
c.Assert(err, checker.IsNil, check.Commentf("failed to decode stat: %s", err))
return stats
}
func jsonBlobHasLTv121NetworkStats(blob map[string]interface{}) bool {
networkStatsIntfc, ok := blob["network"]
if !ok {
return false
}
networkStats, ok := networkStatsIntfc.(map[string]interface{})
if !ok {
return false
}
for _, expectedKey := range expectedNetworkInterfaceStats {
if _, ok := networkStats[expectedKey]; !ok {
return false
}
}
return true
}
func jsonBlobHasGTE121NetworkStats(blob map[string]interface{}) bool {
networksStatsIntfc, ok := blob["networks"]
if !ok {
return false
}
networksStats, ok := networksStatsIntfc.(map[string]interface{})
if !ok {
return false
}
for _, networkInterfaceStatsIntfc := range networksStats {
networkInterfaceStats, ok := networkInterfaceStatsIntfc.(map[string]interface{})
if !ok {
return false
}
for _, expectedKey := range expectedNetworkInterfaceStats {
if _, ok := networkInterfaceStats[expectedKey]; !ok {
return false
}
}
}
return true
}
func (s *DockerSuite) TestAPIStatsContainerNotFound(c *check.C) {
testRequires(c, DaemonIsLinux)
cli, err := client.NewEnvClient()
c.Assert(err, checker.IsNil)
defer cli.Close()
expected := "No such container: nonexistent"
_, err = cli.ContainerStats(context.Background(), "nonexistent", true)
c.Assert(err.Error(), checker.Contains, expected)
_, err = cli.ContainerStats(context.Background(), "nonexistent", false)
c.Assert(err.Error(), checker.Contains, expected)
}
func (s *DockerSuite) TestAPIStatsNoStreamConnectedContainers(c *check.C) {
testRequires(c, DaemonIsLinux)
out1 := runSleepingContainer(c)
id1 := strings.TrimSpace(out1)
c.Assert(waitRun(id1), checker.IsNil)
out2 := runSleepingContainer(c, "--net", "container:"+id1)
id2 := strings.TrimSpace(out2)
c.Assert(waitRun(id2), checker.IsNil)
ch := make(chan error, 1)
go func() {
resp, body, err := request.Get(fmt.Sprintf("/containers/%s/stats?stream=false", id2))
defer body.Close()
if err != nil {
ch <- err
}
if resp.StatusCode != http.StatusOK {
ch <- fmt.Errorf("Invalid StatusCode %v", resp.StatusCode)
}
if resp.Header.Get("Content-Type") != "application/json" {
ch <- fmt.Errorf("Invalid 'Content-Type' %v", resp.Header.Get("Content-Type"))
}
var v *types.Stats
if err := json.NewDecoder(body).Decode(&v); err != nil {
ch <- err
}
ch <- nil
}()
select {
case err := <-ch:
c.Assert(err, checker.IsNil, check.Commentf("Error in stats Engine API: %v", err))
case <-time.After(15 * time.Second):
c.Fatalf("Stats did not return after timeout")
}
}