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cmd/geth: polish the monitoring charts a bit

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This commit is contained in:
Péter Szilágyi 2015-06-24 16:39:22 +03:00
parent e5b820c47b
commit bf99d5b33c
1 changed files with 51 additions and 6 deletions
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57
cmd/geth/monitorcmd.go
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@ -1,6 +1,7 @@
package main
import (
"math"
"reflect"
"sort"
"strings"
@ -67,7 +68,7 @@ func monitor(ctx *cli.Context) {
utils.Fatalf("Metric not float64: %s", metric)
return 0
}
// Assemble the terminal UI
// Create and configure the chart UI defaults
if err := termui.Init(); err != nil {
utils.Fatalf("Unable to initialize terminal UI: %v", err)
}
@ -75,17 +76,33 @@ func monitor(ctx *cli.Context) {
termui.UseTheme("helloworld")
rows := 5
cols := (len(monitored) + rows - 1) / rows
for i := 0; i < rows; i++ {
termui.Body.AddRows(termui.NewRow())
}
// Create each individual data chart
charts := make([]*termui.LineChart, len(monitored))
data := make([][]float64, len(monitored))
for i := 0; i < len(data); i++ {
data[i] = make([]float64, 512)
}
for i, metric := range monitored {
charts[i] = termui.NewLineChart()
charts[i].Border.Label = metric
charts[i].Data = make([]float64, 512)
charts[i].DataLabels = []string{""}
charts[i].Height = termui.TermHeight() / len(monitored)
charts[i].Height = termui.TermHeight() / rows
charts[i].AxesColor = termui.ColorWhite
charts[i].LineColor = termui.ColorGreen
charts[i].PaddingBottom = -1
termui.Body.AddRows(termui.NewRow(termui.NewCol(12, 0, charts[i])))
charts[i].Border.Label = metric
charts[i].Border.LabelFgColor = charts[i].Border.FgColor
charts[i].Border.FgColor = charts[i].Border.BgColor
row := termui.Body.Rows[i%rows]
row.Cols = append(row.Cols, termui.NewCol(12/cols, 0, charts[i]))
}
termui.Body.Align()
termui.Render(termui.Body)
@ -100,7 +117,7 @@ func monitor(ctx *cli.Context) {
if event.Type == termui.EventResize {
termui.Body.Width = termui.TermWidth()
for _, chart := range charts {
chart.Height = termui.TermHeight() / len(monitored)
chart.Height = termui.TermHeight() / rows
}
termui.Body.Align()
termui.Render(termui.Body)
@ -111,7 +128,8 @@ func monitor(ctx *cli.Context) {
utils.Fatalf("Failed to retrieve system metrics: %v", err)
}
for i, metric := range monitored {
charts[i].Data = append([]float64{value(metrics, metric)}, charts[i].Data[:len(charts[i].Data)-1]...)
data[i] = append([]float64{value(metrics, metric)}, data[i][:len(data[i])-1]...)
updateChart(metric, data[i], charts[i])
}
termui.Render(termui.Body)
}
@ -178,3 +196,30 @@ func expandMetrics(metrics map[string]interface{}, path string) []string {
}
return list
}
// updateChart inserts a dataset into a line chart, scaling appropriately as to
// not display weird labels, also updating the chart label accordingly.
func updateChart(metric string, data []float64, chart *termui.LineChart) {
units := []string{"", "K", "M", "G", "T", "E", "P"}
colors := []termui.Attribute{termui.ColorBlue, termui.ColorCyan, termui.ColorGreen, termui.ColorYellow, termui.ColorRed, termui.ColorRed, termui.ColorRed}
// Find the maximum value and scale under 1K
high := data[0]
for _, value := range data[1:] {
high = math.Max(high, value)
}
unit, scale := 0, 1.0
for high >= 1000 {
high, unit, scale = high/1000, unit+1, scale*1000
}
// Update the chart's data points with the scaled values
for i, value := range data {
chart.Data[i] = value / scale
}
// Update the chart's label with the scale units
chart.Border.Label = metric
if unit > 0 {
chart.Border.Label += " [" + units[unit] + "]"
}
chart.LineColor = colors[unit]
}