func renderTo(rpt report.Report, topology string) (detailed.NodeSummaries, error) {
renderer, ok := map[string]render.Renderer{
"processes": render.FilterUnconnected(render.ProcessWithContainerNameRenderer),
"processes-by-name": render.FilterUnconnected(render.ProcessNameRenderer),
"containers": render.ContainerWithImageNameRenderer,
"containers-by-image": render.ContainerImageRenderer,
"hosts": render.HostRenderer,
}[topology]
if !ok {
return detailed.NodeSummaries{}, fmt.Errorf("unknown topology %v", topology)
}
return detailed.Summaries(rpt, renderer.Render(rpt, render.FilterNoop)), nil
}
// Websocket for the full topology.
func handleWebsocket(
ctx context.Context,
rep Reporter,
w http.ResponseWriter,
r *http.Request,
) {
if err := r.ParseForm(); err != nil {
respondWith(w, http.StatusInternalServerError, err.Error())
return
}
loop := websocketLoop
if t := r.Form.Get("t"); t != "" {
var err error
if loop, err = time.ParseDuration(t); err != nil {
respondWith(w, http.StatusBadRequest, t)
return
}
}
conn, err := xfer.Upgrade(w, r, nil)
if err != nil {
// log.Info("Upgrade:", err)
return
}
defer conn.Close()
quit := make(chan struct{})
go func(c xfer.Websocket) {
for { // just discard everything the browser sends
if _, _, err := c.ReadMessage(); err != nil {
if !xfer.IsExpectedWSCloseError(err) {
log.Println("err:", err)
}
close(quit)
break
}
}
}(conn)
var (
previousTopo detailed.NodeSummaries
tick = time.Tick(loop)
wait = make(chan struct{}, 1)
topologyID = mux.Vars(r)["topology"]
)
rep.WaitOn(ctx, wait)
defer rep.UnWait(ctx, wait)
for {
report, err := rep.Report(ctx)
if err != nil {
log.Errorf("Error generating report: %v", err)
return
}
renderer, decorator, err := topologyRegistry.rendererForTopology(topologyID, r.Form, report)
if err != nil {
log.Errorf("Error generating report: %v", err)
return
}
newTopo := detailed.Summaries(report, renderer.Render(report, decorator))
diff := detailed.TopoDiff(previousTopo, newTopo)
previousTopo = newTopo
if err := conn.WriteJSON(diff); err != nil {
if !xfer.IsExpectedWSCloseError(err) {
log.Errorf("cannot serialize topology diff: %s", err)
}
return
}
select {
case <-wait:
case <-tick:
case <-quit:
return
}
}
}
// Full topology.
func handleTopology(ctx context.Context, renderer render.Renderer, decorator render.Decorator, report report.Report, w http.ResponseWriter, r *http.Request) {
respondWith(w, http.StatusOK, APITopology{
Nodes: detailed.Summaries(report, renderer.Render(report, decorator)),
})
}
func TestSummaries(t *testing.T) {
{
// Just a convenient source of some rendered nodes
have := detailed.Summaries(fixture.Report, render.ProcessRenderer.Render(fixture.Report, render.FilterNoop))
// The ids of the processes rendered above
expectedIDs := []string{
fixture.ClientProcess1NodeID,
fixture.ClientProcess2NodeID,
fixture.ServerProcessNodeID,
fixture.NonContainerProcessNodeID,
render.IncomingInternetID,
render.OutgoingInternetID,
}
sort.Strings(expectedIDs)
// It should summarize each node
ids := []string{}
for id := range have {
ids = append(ids, id)
}
sort.Strings(ids)
if !reflect.DeepEqual(expectedIDs, ids) {
t.Fatalf("Expected Summaries to have summarized every node in the process renderer: %v, but got %v", expectedIDs, ids)
}
}
// It should summarize nodes' metrics
{
t1, t2 := mtime.Now().Add(-1*time.Minute), mtime.Now()
metric := report.MakeMetric().Add(t1, 1).Add(t2, 2)
input := fixture.Report.Copy()
input.Process.Nodes[fixture.ClientProcess1NodeID] = input.Process.Nodes[fixture.ClientProcess1NodeID].WithMetrics(report.Metrics{process.CPUUsage: metric})
have := detailed.Summaries(input, render.ProcessRenderer.Render(input, render.FilterNoop))
node, ok := have[fixture.ClientProcess1NodeID]
if !ok {
t.Fatalf("Expected output to have the node we added the metric to")
}
var row report.MetricRow
ok = false
for _, metric := range node.Metrics {
if metric.ID == process.CPUUsage {
row = metric
ok = true
break
}
}
if !ok {
t.Fatalf("Expected node to have the metric we added")
}
// Our summarized MetricRow
want := report.MetricRow{
ID: process.CPUUsage,
Label: "CPU",
Format: "percent",
Value: 2,
Priority: 1,
Metric: &report.Metric{
Samples: nil,
Min: metric.Min,
Max: metric.Max,
First: metric.First,
Last: metric.Last,
},
}
if !reflect.DeepEqual(want, row) {
t.Fatalf("Expected to have summarized the node's metrics: %s", test.Diff(want, row))
}
}
}
