1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
package libpod
import (
"encoding/json"
"net/http"
"time"
"github.com/containers/podman/v3/libpod"
"github.com/containers/podman/v3/pkg/api/handlers/utils"
"github.com/containers/podman/v3/pkg/domain/entities"
"github.com/containers/podman/v3/pkg/domain/infra/abi"
"github.com/gorilla/schema"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
const DefaultStatsPeriod = 5 * time.Second
func StatsContainer(w http.ResponseWriter, r *http.Request) {
runtime := r.Context().Value("runtime").(*libpod.Runtime)
decoder := r.Context().Value("decoder").(*schema.Decoder)
query := struct {
Containers []string `schema:"containers"`
Stream bool `schema:"stream"`
}{
Stream: true,
}
if err := decoder.Decode(&query, r.URL.Query()); err != nil {
utils.Error(w, "Something went wrong.", http.StatusBadRequest, errors.Wrapf(err, "failed to parse parameters for %s", r.URL.String()))
return
}
// Reduce code duplication and use the local/abi implementation of
// container stats.
containerEngine := abi.ContainerEngine{Libpod: runtime}
statsOptions := entities.ContainerStatsOptions{
Stream: query.Stream,
}
// Stats will stop if the connection is closed.
statsChan, err := containerEngine.ContainerStats(r.Context(), query.Containers, statsOptions)
if err != nil {
utils.InternalServerError(w, err)
return
}
// Write header and content type.
w.WriteHeader(http.StatusOK)
w.Header().Add("Content-Type", "application/json")
if flusher, ok := w.(http.Flusher); ok {
flusher.Flush()
}
// Setup JSON encoder for streaming.
coder := json.NewEncoder(w)
coder.SetEscapeHTML(true)
for stats := range statsChan {
if err := coder.Encode(stats); err != nil {
// Note: even when streaming, the stats goroutine will
// be notified (and stop) as the connection will be
// closed.
logrus.Errorf("Unable to encode stats: %v", err)
return
}
if flusher, ok := w.(http.Flusher); ok {
flusher.Flush()
}
}
}
|
