feat(tsdb): add interval calculator

2016-10-10 09:45:33 +02:00
parent 4fafefd66a
commit 0bfb94dc6f
7 changed files with 244 additions and 29 deletions
@@ -0,0 +1,149 @@
+package tsdb
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/grafana/grafana/pkg/log"
+)
+
+var (
+	defaultRes  int64         = 1500
+	minInterval time.Duration = 1 * time.Millisecond
+	year        time.Duration = time.Hour * 24 * 365
+	day         time.Duration = time.Hour * 24 * 365
+)
+
+func CalculateInterval(timerange *TimeRange) string {
+	interval := time.Duration((timerange.MustGetTo().UnixNano() - timerange.MustGetFrom().UnixNano()) / defaultRes)
+
+	log.Info2("res", "resinMs", time.Duration(interval).String())
+
+	if interval < minInterval {
+		return formatDuration(minInterval)
+	}
+
+	return formatDuration(roundInterval(interval))
+}
+
+func formatDuration(inter time.Duration) string {
+	if inter >= year {
+		return fmt.Sprintf("%dy", inter/year)
+	}
+
+	if inter >= day {
+		return fmt.Sprintf("%dd", inter/day)
+	}
+
+	if inter >= time.Hour {
+		return fmt.Sprintf("%dh", inter/time.Hour)
+	}
+
+	if inter >= time.Minute {
+		return fmt.Sprintf("%dm", inter/time.Minute)
+	}
+
+	if inter >= time.Second {
+		return fmt.Sprintf("%ds", inter/time.Second)
+	}
+
+	if inter >= time.Millisecond {
+		return fmt.Sprintf("%dms", inter/time.Millisecond)
+	}
+
+	return "1ms"
+}
+
+func roundInterval(interval time.Duration) time.Duration {
+	switch true {
+	// 0.015s
+	case interval <= 15*time.Millisecond:
+		return time.Millisecond * 10 // 0.01s
+	// 0.035s
+	case interval <= 35*time.Millisecond:
+		return time.Millisecond * 20 // 0.02s
+	// 0.075s
+	case interval <= 75*time.Millisecond:
+		return time.Millisecond * 50 // 0.05s
+	// 0.15s
+	case interval <= 150*time.Millisecond:
+		return time.Millisecond * 100 // 0.1s
+	// 0.35s
+	case interval <= 350*time.Millisecond:
+		return time.Millisecond * 200 // 0.2s
+	// 0.75s
+	case interval <= 750*time.Millisecond:
+		return time.Millisecond * 500 // 0.5s
+	// 1.5s
+	case interval <= 1500*time.Millisecond:
+		return time.Millisecond * 1000 // 1s
+	// 3.5s
+	case interval <= 3500*time.Millisecond:
+		return time.Millisecond * 2000 // 2s
+	// 7.5s
+	case interval <= 7500*time.Millisecond:
+		return time.Millisecond * 5000 // 5s
+	// 12.5s
+	case interval <= 12500*time.Millisecond:
+		return time.Millisecond * 10000 // 10s
+	// 17.5s
+	case interval <= 17500*time.Millisecond:
+		return time.Millisecond * 15000 // 15s
+	// 25s
+	case interval <= 25000*time.Millisecond:
+		return time.Millisecond * 20000 // 20s
+	// 45s
+	case interval <= 45000*time.Millisecond:
+		return time.Millisecond * 30000 // 30s
+	// 1.5m
+	case interval <= 90000*time.Millisecond:
+		return time.Millisecond * 60000 // 1m
+	// 3.5m
+	case interval <= 210000*time.Millisecond:
+		return time.Millisecond * 120000 // 2m
+	// 7.5m
+	case interval <= 450000*time.Millisecond:
+		return time.Millisecond * 300000 // 5m
+	// 12.5m
+	case interval <= 750000*time.Millisecond:
+		return time.Millisecond * 600000 // 10m
+	// 12.5m
+	case interval <= 1050000*time.Millisecond:
+		return time.Millisecond * 900000 // 15m
+	// 25m
+	case interval <= 1500000*time.Millisecond:
+		return time.Millisecond * 1200000 // 20m
+	// 45m
+	case interval <= 2700000*time.Millisecond:
+		return time.Millisecond * 1800000 // 30m
+	// 1.5h
+	case interval <= 5400000*time.Millisecond:
+		return time.Millisecond * 3600000 // 1h
+	// 2.5h
+	case interval <= 9000000*time.Millisecond:
+		return time.Millisecond * 7200000 // 2h
+	// 4.5h
+	case interval <= 16200000*time.Millisecond:
+		return time.Millisecond * 10800000 // 3h
+	// 9h
+	case interval <= 32400000*time.Millisecond:
+		return time.Millisecond * 21600000 // 6h
+	// 24h
+	case interval <= 86400000*time.Millisecond:
+		return time.Millisecond * 43200000 // 12h
+	// 48h
+	case interval <= 172800000*time.Millisecond:
+		return time.Millisecond * 86400000 // 24h
+	// 1w
+	case interval <= 604800000*time.Millisecond:
+		return time.Millisecond * 86400000 // 24h
+	// 3w
+	case interval <= 1814400000*time.Millisecond:
+		return time.Millisecond * 604800000 // 1w
+	// 2y
+	case interval < 3628800000*time.Millisecond:
+		return time.Millisecond * 2592000000 // 30d
+	default:
+		return time.Millisecond * 31536000000 // 1y
+	}
+}