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@ -1,6 +1,7 @@ |
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package main |
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import ( |
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"math" |
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"reflect" |
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"sort" |
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"strings" |
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@ -67,7 +68,7 @@ func monitor(ctx *cli.Context) { |
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utils.Fatalf("Metric not float64: %s", metric) |
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return 0 |
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} |
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// Assemble the terminal UI
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// Create and configure the chart UI defaults
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if err := termui.Init(); err != nil { |
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utils.Fatalf("Unable to initialize terminal UI: %v", err) |
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} |
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@ -75,17 +76,33 @@ func monitor(ctx *cli.Context) { |
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termui.UseTheme("helloworld") |
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rows := 5 |
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cols := (len(monitored) + rows - 1) / rows |
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for i := 0; i < rows; i++ { |
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termui.Body.AddRows(termui.NewRow()) |
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} |
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// Create each individual data chart
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charts := make([]*termui.LineChart, len(monitored)) |
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data := make([][]float64, len(monitored)) |
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for i := 0; i < len(data); i++ { |
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data[i] = make([]float64, 512) |
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} |
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for i, metric := range monitored { |
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charts[i] = termui.NewLineChart() |
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charts[i].Border.Label = metric |
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charts[i].Data = make([]float64, 512) |
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charts[i].DataLabels = []string{""} |
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charts[i].Height = termui.TermHeight() / len(monitored) |
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charts[i].Height = termui.TermHeight() / rows |
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charts[i].AxesColor = termui.ColorWhite |
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charts[i].LineColor = termui.ColorGreen |
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charts[i].PaddingBottom = -1 |
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termui.Body.AddRows(termui.NewRow(termui.NewCol(12, 0, charts[i]))) |
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charts[i].Border.Label = metric |
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charts[i].Border.LabelFgColor = charts[i].Border.FgColor |
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charts[i].Border.FgColor = charts[i].Border.BgColor |
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row := termui.Body.Rows[i%rows] |
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row.Cols = append(row.Cols, termui.NewCol(12/cols, 0, charts[i])) |
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} |
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termui.Body.Align() |
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termui.Render(termui.Body) |
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@ -100,7 +117,7 @@ func monitor(ctx *cli.Context) { |
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if event.Type == termui.EventResize { |
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termui.Body.Width = termui.TermWidth() |
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for _, chart := range charts { |
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chart.Height = termui.TermHeight() / len(monitored) |
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chart.Height = termui.TermHeight() / rows |
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} |
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termui.Body.Align() |
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termui.Render(termui.Body) |
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@ -111,7 +128,8 @@ func monitor(ctx *cli.Context) { |
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utils.Fatalf("Failed to retrieve system metrics: %v", err) |
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} |
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for i, metric := range monitored { |
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charts[i].Data = append([]float64{value(metrics, metric)}, charts[i].Data[:len(charts[i].Data)-1]...) |
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data[i] = append([]float64{value(metrics, metric)}, data[i][:len(data[i])-1]...) |
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updateChart(metric, data[i], charts[i]) |
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} |
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termui.Render(termui.Body) |
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} |
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@ -178,3 +196,30 @@ func expandMetrics(metrics map[string]interface{}, path string) []string { |
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} |
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return list |
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} |
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// updateChart inserts a dataset into a line chart, scaling appropriately as to
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// not display weird labels, also updating the chart label accordingly.
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func updateChart(metric string, data []float64, chart *termui.LineChart) { |
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units := []string{"", "K", "M", "G", "T", "E", "P"} |
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colors := []termui.Attribute{termui.ColorBlue, termui.ColorCyan, termui.ColorGreen, termui.ColorYellow, termui.ColorRed, termui.ColorRed, termui.ColorRed} |
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// Find the maximum value and scale under 1K
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high := data[0] |
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for _, value := range data[1:] { |
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high = math.Max(high, value) |
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} |
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unit, scale := 0, 1.0 |
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for high >= 1000 { |
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high, unit, scale = high/1000, unit+1, scale*1000 |
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} |
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// Update the chart's data points with the scaled values
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for i, value := range data { |
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chart.Data[i] = value / scale |
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} |
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// Update the chart's label with the scale units
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chart.Border.Label = metric |
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if unit > 0 { |
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chart.Border.Label += " [" + units[unit] + "]" |
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} |
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chart.LineColor = colors[unit] |
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} |
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