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package libpod
import (
"encoding/json"
"net/http"
"github.com/containers/common/pkg/cgroups"
"github.com/containers/podman/v3/libpod"
"github.com/containers/podman/v3/pkg/api/handlers/utils"
api "github.com/containers/podman/v3/pkg/api/types"
"github.com/containers/podman/v3/pkg/domain/entities"
"github.com/containers/podman/v3/pkg/domain/infra/abi"
"github.com/containers/podman/v3/pkg/rootless"
"github.com/gorilla/schema"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
func StatsContainer(w http.ResponseWriter, r *http.Request) {
runtime := r.Context().Value(api.RuntimeKey).(*libpod.Runtime)
decoder := r.Context().Value(api.DecoderKey).(*schema.Decoder)
// Check if service is running rootless (cheap check)
if rootless.IsRootless() {
// if so, then verify cgroup v2 available (more expensive check)
if isV2, _ := cgroups.IsCgroup2UnifiedMode(); !isV2 {
msg := "Container stats resource only available for cgroup v2"
utils.Error(w, msg, http.StatusConflict, errors.New(msg))
return
}
}
query := struct {
Containers []string `schema:"containers"`
Stream bool `schema:"stream"`
Interval int `schema:"interval"`
}{
Stream: true,
Interval: 5,
}
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,
Interval: query.Interval,
}
// 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().Set("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()
}
}
}
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