package compat import ( "encoding/binary" "fmt" "io" "net/http" "strconv" "strings" "sync" "time" "github.com/containers/podman/v3/libpod" "github.com/containers/podman/v3/libpod/logs" "github.com/containers/podman/v3/pkg/api/handlers/utils" "github.com/containers/podman/v3/pkg/util" "github.com/gorilla/schema" "github.com/pkg/errors" log "github.com/sirupsen/logrus" ) func LogsFromContainer(w http.ResponseWriter, r *http.Request) { decoder := r.Context().Value("decoder").(*schema.Decoder) runtime := r.Context().Value("runtime").(*libpod.Runtime) query := struct { Follow bool `schema:"follow"` Stdout bool `schema:"stdout"` Stderr bool `schema:"stderr"` Since string `schema:"since"` Until string `schema:"until"` Timestamps bool `schema:"timestamps"` Tail string `schema:"tail"` }{ Tail: "all", } 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 } if !(query.Stdout || query.Stderr) { msg := fmt.Sprintf("%s: you must choose at least one stream", http.StatusText(http.StatusBadRequest)) utils.Error(w, msg, http.StatusBadRequest, errors.Errorf("%s for %s", msg, r.URL.String())) return } name := utils.GetName(r) ctnr, err := runtime.LookupContainer(name) if err != nil { utils.ContainerNotFound(w, name, err) return } var tail int64 = -1 if query.Tail != "all" { tail, err = strconv.ParseInt(query.Tail, 0, 64) if err != nil { utils.BadRequest(w, "tail", query.Tail, err) return } } var since time.Time if _, found := r.URL.Query()["since"]; found { since, err = util.ParseInputTime(query.Since) if err != nil { utils.BadRequest(w, "since", query.Since, err) return } } var until time.Time if _, found := r.URL.Query()["until"]; found { if query.Until != "0" { until, err = util.ParseInputTime(query.Until) if err != nil { utils.BadRequest(w, "until", query.Until, err) return } } } options := &logs.LogOptions{ Details: true, Follow: query.Follow, Since: since, Until: until, Tail: tail, Timestamps: query.Timestamps, } var wg sync.WaitGroup options.WaitGroup = &wg logChannel := make(chan *logs.LogLine, tail+1) if err := runtime.Log(r.Context(), []*libpod.Container{ctnr}, options, logChannel); err != nil { utils.InternalServerError(w, errors.Wrapf(err, "failed to obtain logs for Container '%s'", name)) return } go func() { wg.Wait() close(logChannel) }() w.WriteHeader(http.StatusOK) var frame strings.Builder header := make([]byte, 8) writeHeader := true // Docker does not write stream headers iff the container has a tty. if !utils.IsLibpodRequest(r) { inspectData, err := ctnr.Inspect(false) if err != nil { utils.InternalServerError(w, errors.Wrapf(err, "failed to obtain logs for Container '%s'", name)) return } writeHeader = !inspectData.Config.Tty } for line := range logChannel { if _, found := r.URL.Query()["until"]; found { if line.Time.After(until) && !until.IsZero() { break } } // Reset buffer we're ready to loop again frame.Reset() switch line.Device { case "stdout": if !query.Stdout { continue } header[0] = 1 case "stderr": if !query.Stderr { continue } header[0] = 2 default: // Logging and moving on is the best we can do here. We may have already sent // a Status and Content-Type to client therefore we can no longer report an error. log.Infof("unknown Device type '%s' in log file from Container %s", line.Device, ctnr.ID()) continue } if query.Timestamps { frame.WriteString(line.Time.Format(time.RFC3339)) frame.WriteString(" ") } frame.WriteString(line.Msg) if !line.Partial() { frame.WriteString("\n") } if writeHeader { binary.BigEndian.PutUint32(header[4:], uint32(frame.Len())) if _, err := w.Write(header[0:8]); err != nil { log.Errorf("unable to write log output header: %q", err) } } if _, err := io.WriteString(w, frame.String()); err != nil { log.Errorf("unable to write frame string: %q", err) } if flusher, ok := w.(http.Flusher); ok { flusher.Flush() } } }