github.com/baris/docker@v1.7.0/integration-cli/docker_api_stats_test.go (about)

     1  package main
     2  
     3  import (
     4  	"encoding/json"
     5  	"fmt"
     6  	"strings"
     7  
     8  	"github.com/docker/docker/api/types"
     9  	"github.com/go-check/check"
    10  )
    11  
    12  func (s *DockerSuite) TestCliStatsNoStreamGetCpu(c *check.C) {
    13  	out, _ := dockerCmd(c, "run", "-d", "busybox", "/bin/sh", "-c", "while true;do echo 'Hello'; usleep 100000; done")
    14  
    15  	id := strings.TrimSpace(out)
    16  	err := waitRun(id)
    17  	c.Assert(err, check.IsNil)
    18  
    19  	resp, body, err := sockRequestRaw("GET", fmt.Sprintf("/containers/%s/stats?stream=false", id), nil, "")
    20  	c.Assert(err, check.IsNil)
    21  	c.Assert(resp.ContentLength > 0, check.Equals, true, check.Commentf("should not use chunked encoding"))
    22  	c.Assert(resp.Header.Get("Content-Type"), check.Equals, "application/json")
    23  
    24  	var v *types.Stats
    25  	err = json.NewDecoder(body).Decode(&v)
    26  	c.Assert(err, check.IsNil)
    27  
    28  	var cpuPercent = 0.0
    29  	cpuDelta := float64(v.CpuStats.CpuUsage.TotalUsage - v.PreCpuStats.CpuUsage.TotalUsage)
    30  	systemDelta := float64(v.CpuStats.SystemUsage - v.PreCpuStats.SystemUsage)
    31  	cpuPercent = (cpuDelta / systemDelta) * float64(len(v.CpuStats.CpuUsage.PercpuUsage)) * 100.0
    32  	if cpuPercent == 0 {
    33  		c.Fatalf("docker stats with no-stream get cpu usage failed: was %v", cpuPercent)
    34  	}
    35  }