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|
package dashboard
import (
"fmt"
"ior/internal/statsengine"
"ior/internal/tui"
"strings"
"time"
)
func renderOverview(snap *statsengine.Snapshot, width, height int) string {
_ = height
if snap == nil {
return tui.PanelStyle.Render("Overview: waiting for stats...")
}
boxWidth := summaryBoxWidth(width)
box1 := renderSyscallBox(snap, boxWidth)
box2 := renderBytesBox(snap, boxWidth)
box3 := renderErrorBox(snap, boxWidth)
row := strings.Join([]string{box1, box2, box3}, "\n")
trends := fmt.Sprintf(
"Trends: latency %s gap %s throughput %s",
trendWithArrow(snap.LatencyTrend),
trendWithArrow(snap.GapTrend),
trendWithArrow(snap.ThroughputTrend),
)
latencySpark := "Latency: " + renderSparkline(snap.LatencySeriesNs(), sparklineWidth(width))
throughputSpark := "Throughput: " + renderSparkline(snap.ThroughputSeriesB(), sparklineWidth(width))
topSyscalls := "Top syscalls: " + summarizeTopSyscalls(snap)
return strings.Join(
[]string{
row,
tui.HighlightStyle.Render(trends),
tui.PanelStyle.Render(latencySpark),
tui.PanelStyle.Render(throughputSpark),
tui.PanelStyle.Render(topSyscalls),
},
"\n",
)
}
func renderSyscallBox(snap *statsengine.Snapshot, width int) string {
content := fmt.Sprintf(
"Elapsed: %s\nSyscalls: %d\nRate: %.1f/s",
formatElapsed(snap.Elapsed),
snap.TotalSyscalls,
snap.SyscallRatePerSec,
)
return tui.PanelStyle.Width(width).Render(content)
}
func renderBytesBox(snap *statsengine.Snapshot, width int) string {
content := fmt.Sprintf(
"Read/s: %s\nWrite/s: %s\nTotal: %s",
formatBytes(snap.ReadBytesPerSec),
formatBytes(snap.WriteBytesPerSec),
formatBytes(float64(snap.TotalBytes)),
)
return tui.PanelStyle.Width(width).Render(content)
}
func renderErrorBox(snap *statsengine.Snapshot, width int) string {
errPercent := 0.0
if snap.TotalSyscalls > 0 {
errPercent = float64(snap.TotalErrors) / float64(snap.TotalSyscalls) * 100
}
content := fmt.Sprintf(
"Errors: %d\nError rate: %.2f%%\nLatency mean: %.0fns",
snap.TotalErrors,
errPercent,
snap.LatencyMeanNs,
)
return tui.PanelStyle.Width(width).Render(content)
}
func trendWithArrow(trend statsengine.Trend) string {
switch trend.Direction {
case statsengine.TrendRising:
return fmt.Sprintf("↑ %.1f%%", trend.DeltaPercent)
case statsengine.TrendFalling:
return fmt.Sprintf("↓ %.1f%%", trend.DeltaPercent)
default:
return fmt.Sprintf("→ %.1f%%", trend.DeltaPercent)
}
}
func summarizeTopSyscalls(snap *statsengine.Snapshot) string {
syscalls := snap.Syscalls()
if len(syscalls) == 0 {
return "none"
}
limit := 3
if len(syscalls) < limit {
limit = len(syscalls)
}
parts := make([]string, 0, limit)
for _, syscall := range syscalls[:limit] {
parts = append(parts, fmt.Sprintf("%s(%d)", syscall.Name, syscall.Count))
}
return strings.Join(parts, ", ")
}
func formatElapsed(elapsed time.Duration) string {
if elapsed <= 0 {
return "0s"
}
return elapsed.Round(time.Second).String()
}
func formatBytes(value float64) string {
units := []string{"B", "KB", "MB", "GB", "TB"}
unit := 0
for value >= 1024 && unit < len(units)-1 {
value /= 1024
unit++
}
if unit == 0 {
return fmt.Sprintf("%.0f%s", value, units[unit])
}
return fmt.Sprintf("%.1f%s", value, units[unit])
}
func summaryBoxWidth(width int) int {
if width <= 0 {
return 24
}
w := (width - 4) / 3
if w < 18 {
return 18
}
return w
}
func sparklineWidth(width int) int {
if width <= 0 {
return 20
}
w := width - 14
if w < 8 {
return 8
}
if w > 80 {
return 80
}
return w
}
|
