wip-devtools

system_monitor.go

@@ -0,0 +1,76 @@
+package mujica
+
+import (
+	"fmt"
+	"math"
+	"time"
+
+	"github.com/egoist/mygo/ui"
+
+	"mujicaui/theme"
+)
+
+// MonitorMetric is one sampled resource; Samples line up with the shared times.
+type MonitorMetric struct {
+	Name    string
+	Unit    string
+	Samples []float64
+}
+
+// SystemMonitorOptions configure a SystemMonitor.
+type SystemMonitorOptions struct {
+	// Height of each chart; zero means 110.
+	Height float32
+	Status DataStatus
+	Error  string
+}
+
+// SystemMonitorResult reports this frame's events.
+type SystemMonitorResult struct {
+	Element *ui.Element
+	Retry   bool
+}
+
+// SystemMonitor stacks a live line chart per metric over one time axis, sampled by the caller.
+func SystemMonitor(c *ui.Context, times []time.Time, metrics []MonitorMetric, opts SystemMonitorOptions) SystemMonitorResult {
+	if opts.Height < 0 {
+		panic("mujica: SystemMonitor Height is negative")
+	}
+	for i, m := range metrics {
+		if m.Name == "" || len(m.Samples) != len(times) {
+			panic(fmt.Sprintf("mujica: SystemMonitor metric %d needs a Name and one sample per time", i))
+		}
+	}
+	h := opts.Height
+	if h == 0 {
+		h = 110
+	}
+	k := Tokens(c)
+	u := Density(c).Unit()
+	var r SystemMonitorResult
+	r.Element = ui.Column(c).Shrink(0).Gap(u * 3)
+	r.Element.Children(func() {
+		for _, m := range metrics {
+			ui.Column(c).Key(m.Name).Gap(u).Children(func() {
+				ui.Row(c).Gap(u * 2).AlignItems(ui.Center).Children(func() {
+					ui.Text(c, m.Name).FontWeight(600).Grow(1)
+					last := math.NaN()
+					if n := len(m.Samples); n > 0 {
+						last = m.Samples[n-1]
+					}
+					if !math.IsNaN(last) && opts.Status == DataReady {
+						ui.Text(c, fmt.Sprintf("%s %s", sandboxNum(last), m.Unit)).FontFeatures("tnum").
+							FontSize(FontSize(c, theme.CaptionSize+1)).TextColor(k.Text).Role(ui.RoleStatus)
+					}
+				})
+				unit := m.Unit
+				res := LineChart(c, []ChartSeries{{Name: m.Name, Values: m.Samples}}, LineChartOptions{
+					Frame: ChartFrame{Label: m.Name, Height: h, Status: opts.Status, Error: opts.Error},
+					Times: times, Format: func(v float64) string { return sandboxNum(v) + " " + unit },
+				})
+				r.Retry = r.Retry || res.Retried()
+			})
+		}
+	})
+	return r
+}