Fixes content-type/length for stats stream=false

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

api/server/server.go

@@ -572,7 +572,16 @@ func (s *Server) getContainersStats(version version.Version, w http.ResponseWrit
 		return fmt.Errorf("Missing parameter")
 	}
 
-	return s.daemon.ContainerStats(vars["name"], boolValueOrDefault(r, "stream", true), ioutils.NewWriteFlusher(w))
+	stream := boolValueOrDefault(r, "stream", true)
+	var out io.Writer
+	if !stream {
+		w.Header().Set("Content-Type", "application/json")
+		out = w
+	} else {
+		out = ioutils.NewWriteFlusher(w)
+	}
+
+	return s.daemon.ContainerStats(vars["name"], stream, out)
 }
 
 func (s *Server) getContainersLogs(version version.Version, w http.ResponseWriter, r *http.Request, vars map[string]string) error {

daemon/stats.go

@@ -2,9 +2,10 @@ package daemon
 
 import (
 	"encoding/json"
+	"io"
+
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/daemon/execdriver"
-	"io"
 )
 
 func (daemon *Daemon) ContainerStats(name string, stream bool, out io.Writer) error {
@@ -12,31 +13,39 @@ func (daemon *Daemon) ContainerStats(name string, stream bool, out io.Writer) er
 	if err != nil {
 		return err
 	}
-	var pre_cpu_stats types.CpuStats
-	for first_v := range updates {
-		first_update := first_v.(*execdriver.ResourceStats)
-		first_stats := convertToAPITypes(first_update.Stats)
-		pre_cpu_stats = first_stats.CpuStats
-		pre_cpu_stats.SystemUsage = first_update.SystemUsage
-		break
-	}
-	enc := json.NewEncoder(out)
-	for v := range updates {
+
+	var preCpuStats types.CpuStats
+	getStat := func(v interface{}) *types.Stats {
 		update := v.(*execdriver.ResourceStats)
-		ss := convertToAPITypes(update.Stats)
-		ss.PreCpuStats = pre_cpu_stats
+		ss := convertStatsToAPITypes(update.Stats)
+		ss.PreCpuStats = preCpuStats
 		ss.MemoryStats.Limit = uint64(update.MemoryLimit)
 		ss.Read = update.Read
 		ss.CpuStats.SystemUsage = update.SystemUsage
-		pre_cpu_stats = ss.CpuStats
-		if err := enc.Encode(ss); err != nil {
+		preCpuStats = ss.CpuStats
+		return ss
+	}
+
+	enc := json.NewEncoder(out)
+
+	if !stream {
+		// prime the cpu stats so they aren't 0 in the final output
+		s := getStat(<-updates)
+
+		// now pull stats again with the cpu stats primed
+		s = getStat(<-updates)
+		err := enc.Encode(s)
+		daemon.UnsubscribeToContainerStats(name, updates)
+		return err
+	}
+
+	for v := range updates {
+		s := getStat(v)
+		if err := enc.Encode(s); err != nil {
 			// TODO: handle the specific broken pipe
 			daemon.UnsubscribeToContainerStats(name, updates)
 			return err
 		}
-		if !stream {
-			break
-		}
 	}
 	return nil
 }

daemon/stats_linux.go

@@ -6,9 +6,9 @@ import (
 	"github.com/docker/libcontainer/cgroups"
 )
 
-// convertToAPITypes converts the libcontainer.Stats to the api specific
+// convertStatsToAPITypes converts the libcontainer.Stats to the api specific
 // structs.  This is done to preserve API compatibility and versioning.
-func convertToAPITypes(ls *libcontainer.Stats) *types.Stats {
+func convertStatsToAPITypes(ls *libcontainer.Stats) *types.Stats {
 	s := &types.Stats{}
 	if ls.Interfaces != nil {
 		s.Network = types.Network{}

daemon/stats_windows.go

@@ -5,9 +5,9 @@ import (
 	"github.com/docker/libcontainer"
 )
 
-// convertToAPITypes converts the libcontainer.Stats to the api specific
+// convertStatsToAPITypes converts the libcontainer.Stats to the api specific
 // structs.  This is done to preserve API compatibility and versioning.
-func convertToAPITypes(ls *libcontainer.Stats) *types.Stats {
+func convertStatsToAPITypes(ls *libcontainer.Stats) *types.Stats {
 	// TODO Windows. Refactor accordingly to fill in stats.
 	s := &types.Stats{}
 	return s

integration-cli/docker_api_stats_test.go

@@ -10,14 +10,16 @@ import (
 )
 
 func (s *DockerSuite) TestCliStatsNoStreamGetCpu(c *check.C) {
-	out, _ := dockerCmd(c, "run", "-d", "--cpu-quota=2000", "busybox", "/bin/sh", "-c", "while true;do echo 'Hello';done")
+	out, _ := dockerCmd(c, "run", "-d", "busybox", "/bin/sh", "-c", "while true;do echo 'Hello'; usleep 100000; done")
 
 	id := strings.TrimSpace(out)
 	err := waitRun(id)
 	c.Assert(err, check.IsNil)
 
-	_, body, err := sockRequestRaw("GET", fmt.Sprintf("/containers/%s/stats?stream=false", id), nil, "")
+	resp, body, err := sockRequestRaw("GET", fmt.Sprintf("/containers/%s/stats?stream=false", id), nil, "")
 	c.Assert(err, check.IsNil)
+	c.Assert(resp.ContentLength > 0, check.Equals, true, check.Commentf("should not use chunked encoding"))
+	c.Assert(resp.Header.Get("Content-Type"), check.Equals, "application/json")
 
 	var v *types.Stats
 	err = json.NewDecoder(body).Decode(&v)