125 lines
2.6 KiB
Go
125 lines
2.6 KiB
Go
package gauge
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import (
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"fmt"
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ui "github.com/gizak/termui/v3"
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"github.com/sqshq/sampler/component"
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"github.com/sqshq/sampler/console"
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"github.com/sqshq/sampler/data"
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"image"
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"math"
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"strconv"
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)
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const (
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MinValueLabel = "min"
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MaxValueLabel = "max"
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CurValueLabel = "cur"
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)
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type Gauge struct {
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ui.Block
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data.Consumer
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*component.Alerter
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minValue float64
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maxValue float64
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curValue float64
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scale int
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color ui.Color
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}
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func NewGauge(title string, scale int, color ui.Color) *Gauge {
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consumer := data.NewConsumer()
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block := *ui.NewBlock()
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block.Title = title
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gauge := Gauge{
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Block: block,
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Consumer: consumer,
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Alerter: component.NewAlerter(consumer.AlertChannel),
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scale: scale,
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color: color,
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}
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go gauge.consume()
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return &gauge
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}
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func (g *Gauge) consume() {
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for {
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select {
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case sample := <-g.SampleChannel:
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g.ConsumeSample(sample)
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//case alert := <-g.alertChannel:
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// TODO base alerting mechanism
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}
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}
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}
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func (g *Gauge) ConsumeSample(sample data.Sample) {
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float, err := strconv.ParseFloat(sample.Value, 64)
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if err != nil {
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// TODO visual notification + check sample.Error
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}
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switch sample.Label {
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case MinValueLabel:
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g.minValue = float
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break
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case MaxValueLabel:
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g.maxValue = float
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break
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case CurValueLabel:
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g.curValue = float
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break
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}
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}
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func (g *Gauge) Draw(buf *ui.Buffer) {
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g.Block.Draw(buf)
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percent := 0.0
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if g.curValue != 0 && g.maxValue != g.minValue {
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percent = (100 * g.curValue) / (g.maxValue - g.minValue)
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}
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label := fmt.Sprintf("%v%% (%v)", formatValue(percent, g.scale), g.curValue)
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// plot bar
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barWidth := int((percent / 100) * float64(g.Inner.Dx()))
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if barWidth == 0 {
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barWidth = 1
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} else if barWidth > g.Dx()-2 {
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barWidth = g.Dx() - 2
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}
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buf.Fill(
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ui.NewCell(console.SymbolVerticalBar, ui.NewStyle(g.color)),
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image.Rect(g.Inner.Min.X+1, g.Inner.Min.Y, g.Inner.Min.X+barWidth, g.Inner.Max.Y),
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)
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// plot label
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labelXCoordinate := g.Inner.Min.X + (g.Inner.Dx() / 2) - int(float64(len(label))/2)
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labelYCoordinate := g.Inner.Min.Y + ((g.Inner.Dy() - 1) / 2)
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if labelYCoordinate < g.Inner.Max.Y {
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for i, char := range label {
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style := ui.NewStyle(console.ColorWhite)
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if labelXCoordinate+i+1 <= g.Inner.Min.X+barWidth {
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style = ui.NewStyle(console.ColorWhite, ui.ColorClear)
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}
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buf.SetCell(ui.NewCell(char, style), image.Pt(labelXCoordinate+i, labelYCoordinate))
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}
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}
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}
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// TODO extract to utils
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func formatValue(value float64, scale int) string {
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if math.Abs(value) == math.MaxFloat64 {
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return "Inf"
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} else {
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format := "%." + strconv.Itoa(scale) + "f"
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return fmt.Sprintf(format, value)
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}
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}
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