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package main
import (
"fmt"
"math/rand"
"time"
tui "github.com/grindlemire/go-tui"
)
type dashboardApp struct {
cpu *tui.State[int]
mem *tui.State[int]
disk *tui.State[int]
netIn *tui.State[int]
netOut *tui.State[int]
sparkIn *tui.State[[]int]
sparkOut *tui.State[[]int]
events *tui.State[[]string]
eventCh <-chan string
scrollY *tui.State[int]
eventsRef *tui.Ref
}
func Dashboard(eventCh <-chan string) *dashboardApp {
return &dashboardApp{
cpu: tui.NewState(45),
mem: tui.NewState(62),
disk: tui.NewState(38),
netIn: tui.NewState(142),
netOut: tui.NewState(89),
sparkIn: tui.NewState([]int{3, 5, 4, 6, 7, 5, 4, 3, 5, 6, 7, 8, 6, 5, 4, 3, 5, 6, 7, 5}),
sparkOut: tui.NewState([]int{2, 3, 4, 3, 5, 4, 3, 2, 3, 4, 5, 6, 4, 3, 2, 3, 4, 5, 4, 3}),
events: tui.NewState([]string{}),
eventCh: eventCh,
scrollY: tui.NewState(0),
eventsRef: tui.NewRef(),
}
}
func (d *dashboardApp) scrollBy(delta int) {
el := d.eventsRef.El()
if el == nil {
return
}
_, maxY := el.MaxScroll()
newY := d.scrollY.Get() + delta
if newY < 0 {
newY = 0
} else if newY > maxY {
newY = maxY
}
d.scrollY.Set(newY)
}
func (d *dashboardApp) KeyMap() tui.KeyMap {
return tui.KeyMap{
tui.On(tui.KeyEscape, func(ke tui.KeyEvent) { ke.App().Stop() }),
tui.On(tui.Rune('q'), func(ke tui.KeyEvent) { ke.App().Stop() }),
tui.On(tui.Rune('j'), func(ke tui.KeyEvent) { d.scrollBy(1) }),
tui.On(tui.Rune('k'), func(ke tui.KeyEvent) { d.scrollBy(-1) }),
tui.On(tui.KeyDown, func(ke tui.KeyEvent) { d.scrollBy(1) }),
tui.On(tui.KeyUp, func(ke tui.KeyEvent) { d.scrollBy(-1) }),
}
}
func (d *dashboardApp) HandleMouse(me tui.MouseEvent) bool {
switch me.Button {
case tui.MouseWheelUp:
d.scrollBy(-1)
return true
case tui.MouseWheelDown:
d.scrollBy(1)
return true
}
return false
}
func (d *dashboardApp) Watchers() []tui.Watcher {
return []tui.Watcher{
tui.OnTimer(500*time.Millisecond, d.updateMetrics),
tui.Watch(d.eventCh, d.addEvent),
}
}
func (d *dashboardApp) updateMetrics() {
d.cpu.Set(clampVal(d.cpu.Get()+rand.Intn(11)-5, 5, 95))
d.mem.Set(clampVal(d.mem.Get()+rand.Intn(7)-3, 20, 90))
d.disk.Set(clampVal(d.disk.Get()+rand.Intn(3)-1, 20, 80))
d.netIn.Set(clampVal(d.netIn.Get()+rand.Intn(41)-20, 50, 300))
d.netOut.Set(clampVal(d.netOut.Get()+rand.Intn(31)-15, 30, 200))
inData := d.sparkIn.Get()
inData = append(inData[1:], d.netIn.Get()/30)
d.sparkIn.Set(inData)
outData := d.sparkOut.Get()
outData = append(outData[1:], d.netOut.Get()/30)
d.sparkOut.Set(outData)
}
func (d *dashboardApp) addEvent(event string) {
current := d.events.Get()
ts := time.Now().Format("15:04:05")
entry := fmt.Sprintf("%s %s", ts, event)
current = append(current, entry)
if len(current) > 50 {
current = current[len(current)-50:]
}
d.events.Set(current)
// Auto-scroll to bottom
el := d.eventsRef.El()
if el != nil {
_, maxY := el.MaxScroll()
d.scrollY.Set(maxY + 1)
}
}
func clampVal(v, min, max int) int {
if v < min {
return min
}
if v > max {
return max
}
return v
}
func metricBar(value, max int) string {
width := 20
filled := value * width / max
bar := ""
for i := 0; i < width; i++ {
if i < filled {
bar += "█"
} else {
bar += "░"
}
}
return bar
}
func metricColor(value int) string {
if value >= 80 {
return "text-red font-bold"
}
if value >= 60 {
return "text-yellow"
}
return "text-green"
}
func sparkline(data []int) string {
blocks := []rune{'▁', '▂', '▃', '▄', '▅', '▆', '▇', '█'}
maxVal := 1
for _, v := range data {
if v > maxVal {
maxVal = v
}
}
s := ""
for _, v := range data {
idx := v * 7 / maxVal
if idx > 7 {
idx = 7
}
s += string(blocks[idx])
}
return s
}
func produceEvents(ch chan<- string, stopCh <-chan struct{}) {
defer close(ch)
events := []string{
"Deploy completed",
"Health check passed",
"New connection from 10.0.0.5",
"Cache invalidated",
"Backup complete",
"Certificate renewed",
"Config reloaded",
"Scale up: 3 replicas",
"Alert cleared: cpu",
"Metrics exported",
}
for {
delay := time.Duration(2000+rand.Intn(3000)) * time.Millisecond
select {
case <-stopCh:
return
case <-time.After(delay):
}
event := events[rand.Intn(len(events))]
select {
case <-stopCh:
return
case ch <- event:
}
}
}
templ (d *dashboardApp) Render() {
<div class="flex-col p-1 gap-1 h-full border-rounded border-cyan">
<div class="flex justify-center shrink-0">
<span class="text-gradient-cyan-magenta font-bold">Dashboard</span>
</div>
<div class="flex gap-1 shrink-0">
<div class="flex-col border-rounded p-1 gap-1" flexGrow={1.0}>
<span class="text-gradient-cyan-magenta font-bold">CPU</span>
<span class={metricColor(d.cpu.Get())}>{metricBar(d.cpu.Get(), 100)}</span>
<span class={metricColor(d.cpu.Get()) + " font-bold"}>{fmt.Sprintf("%d%%", d.cpu.Get())}</span>
</div>
<div class="flex-col border-rounded p-1 gap-1" flexGrow={1.0}>
<span class="text-gradient-cyan-magenta font-bold">Memory</span>
<span class={metricColor(d.mem.Get())}>{metricBar(d.mem.Get(), 100)}</span>
<span class={metricColor(d.mem.Get()) + " font-bold"}>{fmt.Sprintf("%d%%", d.mem.Get())}</span>
</div>
<div class="flex-col border-rounded p-1 gap-1" flexGrow={1.0}>
<span class="text-gradient-cyan-magenta font-bold">Disk</span>
<span class={metricColor(d.disk.Get())}>{metricBar(d.disk.Get(), 100)}</span>
<span class={metricColor(d.disk.Get()) + " font-bold"}>{fmt.Sprintf("%d%%", d.disk.Get())}</span>
</div>
</div>
<div class="flex gap-1 flex-grow">
<div class="flex-col border-rounded p-1 gap-1" flexGrow={1.0}>
<span class="text-gradient-cyan-magenta font-bold">Network Traffic</span>
<div class="flex gap-1">
<span class="font-dim">In:</span>
<span class="text-cyan">{sparkline(d.sparkIn.Get())}</span>
</div>
<div class="flex gap-1">
<span class="font-dim">Out:</span>
<span class="text-magenta">{sparkline(d.sparkOut.Get())}</span>
</div>
<div class="flex gap-2">
<span class="text-cyan font-bold">{fmt.Sprintf("In: %d MB/s", d.netIn.Get())}</span>
<span class="text-magenta font-bold">{fmt.Sprintf("Out: %d MB/s", d.netOut.Get())}</span>
</div>
</div>
<div
ref={d.eventsRef}
class="flex-col border-rounded p-1 gap-1"
flexGrow={1.0}
scrollable={tui.ScrollVertical}
scrollOffset={0, d.scrollY.Get()}
>
<span class="text-gradient-cyan-magenta font-bold">Recent Events</span>
for _, event := range d.events.Get() {
<span class="text-green">{event}</span>
}
if len(d.events.Get()) == 0 {
<span class="font-dim">Waitingevents...</span>
}
</div>
</div>
<div class="flex justify-center shrink-0">
<span class="font-dim">j/k scroll events | q to quit</span>
</div>
</div>
}
|