mirror of https://github.com/containers/podman.git
96 lines
2.6 KiB
Go
96 lines
2.6 KiB
Go
//go:build !remote
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package libpod
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import (
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"encoding/json"
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"errors"
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"fmt"
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"net/http"
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"github.com/containers/common/pkg/cgroups"
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"github.com/containers/podman/v5/libpod"
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"github.com/containers/podman/v5/pkg/api/handlers/utils"
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api "github.com/containers/podman/v5/pkg/api/types"
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"github.com/containers/podman/v5/pkg/domain/entities"
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"github.com/containers/podman/v5/pkg/domain/infra/abi"
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"github.com/containers/podman/v5/pkg/rootless"
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"github.com/gorilla/schema"
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"github.com/sirupsen/logrus"
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)
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func StatsContainer(w http.ResponseWriter, r *http.Request) {
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runtime := r.Context().Value(api.RuntimeKey).(*libpod.Runtime)
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decoder := r.Context().Value(api.DecoderKey).(*schema.Decoder)
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// Check if service is running rootless (cheap check)
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if rootless.IsRootless() {
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// if so, then verify cgroup v2 available (more expensive check)
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if isV2, _ := cgroups.IsCgroup2UnifiedMode(); !isV2 {
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utils.Error(w, http.StatusConflict, errors.New("container stats resource only available for cgroup v2"))
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return
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}
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}
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query := struct {
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Containers []string `schema:"containers"`
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Stream bool `schema:"stream"`
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Interval int `schema:"interval"`
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All bool `schema:"all"`
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}{
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Stream: true,
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Interval: 5,
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All: false,
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}
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if err := decoder.Decode(&query, r.URL.Query()); err != nil {
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utils.Error(w, http.StatusBadRequest, fmt.Errorf("failed to parse parameters for %s: %w", r.URL.String(), err))
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return
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}
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// Reduce code duplication and use the local/abi implementation of
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// container stats.
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containerEngine := abi.ContainerEngine{Libpod: runtime}
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statsOptions := entities.ContainerStatsOptions{
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Stream: query.Stream,
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Interval: query.Interval,
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All: query.All,
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}
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// Stats will stop if the connection is closed.
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statsChan, err := containerEngine.ContainerStats(r.Context(), query.Containers, statsOptions)
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if err != nil {
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utils.InternalServerError(w, err)
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return
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}
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wroteContent := false
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// Set up JSON encoder for streaming.
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coder := json.NewEncoder(w)
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coder.SetEscapeHTML(true)
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for stats := range statsChan {
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if !wroteContent {
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if stats.Error != nil {
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utils.ContainerNotFound(w, "", stats.Error)
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return
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}
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// Write header and content type.
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w.WriteHeader(http.StatusOK)
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w.Header().Set("Content-Type", "application/json")
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wroteContent = true
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}
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if err := coder.Encode(stats); err != nil {
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// Note: even when streaming, the stats goroutine will
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// be notified (and stop) as the connection will be
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// closed.
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logrus.Errorf("Unable to encode stats: %v", err)
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return
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}
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if flusher, ok := w.(http.Flusher); ok {
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flusher.Flush()
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}
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}
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}
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