package compat import ( "net/http" "github.com/containers/podman/v3/libpod" "github.com/containers/podman/v3/libpod/events" "github.com/containers/podman/v3/pkg/api/handlers/utils" "github.com/containers/podman/v3/pkg/domain/entities" "github.com/containers/podman/v3/pkg/util" "github.com/gorilla/schema" jsoniter "github.com/json-iterator/go" "github.com/pkg/errors" "github.com/sirupsen/logrus" ) // NOTE: this endpoint serves both the docker-compatible one and the new libpod // one. func GetEvents(w http.ResponseWriter, r *http.Request) { var ( fromStart bool decoder = r.Context().Value("decoder").(*schema.Decoder) runtime = r.Context().Value("runtime").(*libpod.Runtime) json = jsoniter.ConfigCompatibleWithStandardLibrary // FIXME: this should happen on the package level ) // NOTE: the "filters" parameter is extracted separately for backwards // compat via `filterFromRequest()`. query := struct { Since string `schema:"since"` Until string `schema:"until"` Stream bool `schema:"stream"` }{ Stream: true, } if err := decoder.Decode(&query, r.URL.Query()); err != nil { utils.Error(w, "failed to parse parameters", http.StatusBadRequest, errors.Wrapf(err, "failed to parse parameters for %s", r.URL.String())) return } if len(query.Since) > 0 || len(query.Until) > 0 { fromStart = true } libpodFilters, err := util.FiltersFromRequest(r) if err != nil { utils.Error(w, "failed to parse parameters", http.StatusBadRequest, errors.Wrapf(err, "failed to parse parameters for %s", r.URL.String())) return } eventChannel := make(chan *events.Event) errorChannel := make(chan error) // Start reading events. go func() { readOpts := events.ReadOptions{ FromStart: fromStart, Stream: query.Stream, Filters: libpodFilters, EventChannel: eventChannel, Since: query.Since, Until: query.Until, } errorChannel <- runtime.Events(r.Context(), readOpts) }() var flush = func() {} if flusher, ok := w.(http.Flusher); ok { flush = flusher.Flush } w.Header().Set("Content-Type", "application/json") w.WriteHeader(http.StatusOK) flush() coder := json.NewEncoder(w) coder.SetEscapeHTML(true) for stream := true; stream; stream = query.Stream { select { case err := <-errorChannel: if err != nil { // FIXME StatusOK already sent above cannot send 500 here utils.InternalServerError(w, err) } return case evt := <-eventChannel: if evt == nil { continue } e := entities.ConvertToEntitiesEvent(*evt) if !utils.IsLibpodRequest(r) && e.Status == "died" { e.Status = "die" } if err := coder.Encode(e); err != nil { logrus.Errorf("unable to write json: %q", err) } flush() case <-r.Context().Done(): return } } }