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gtime.go
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gtime.go
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package gtime
import (
"fmt"
"regexp"
"strconv"
"strings"
"time"
)
var dateUnitPattern = regexp.MustCompile(`^(\d+)([dwMy])$`)
// ParseInterval parses an interval with support for all units that Grafana uses.
// An interval is relative to the current wall time.
func ParseInterval(inp string) (time.Duration, error) {
dur, period, err := parse(inp)
if err != nil {
return 0, err
}
if period == "" {
return dur, nil
}
num := int(dur)
// Use UTC to ensure that the interval is deterministic, and daylight saving
// doesn't cause surprises
now := time.Now().UTC()
switch period {
case "d":
return now.AddDate(0, 0, num).Sub(now), nil
case "w":
return now.AddDate(0, 0, num*7).Sub(now), nil
case "M":
return now.AddDate(0, num, 0).Sub(now), nil
case "y":
return now.AddDate(num, 0, 0).Sub(now), nil
}
return 0, fmt.Errorf("invalid interval %q", inp)
}
// ParseDuration parses a duration with support for all units that Grafana uses.
// Durations are independent of wall time.
func ParseDuration(inp string) (time.Duration, error) {
dur, period, err := parse(inp)
if err != nil {
return 0, err
}
if period == "" {
return dur, nil
}
// The average number of days in a year, using the Julian calendar
const daysInAYear = 365.25
const day = 24 * time.Hour
const week = 7 * day
const year = time.Duration(float64(day) * daysInAYear)
const month = time.Duration(float64(year) / 12)
switch period {
case "d":
return dur * day, nil
case "w":
return dur * week, nil
case "M":
return dur * month, nil
case "y":
return dur * year, nil
}
return 0, fmt.Errorf("invalid duration %q", inp)
}
func parse(inp string) (time.Duration, string, error) {
result := dateUnitPattern.FindSubmatch([]byte(inp))
if len(result) != 3 {
dur, err := time.ParseDuration(inp)
return dur, "", err
}
num, err := strconv.Atoi(string(result[1]))
if err != nil {
return 0, "", err
}
return time.Duration(num), string(result[2]), nil
}
// FormatInterval converts a duration into the units that Grafana uses
func FormatInterval(inter time.Duration) string {
year := time.Hour * 24 * 365
day := time.Hour * 24
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"
}
// GetIntervalFrom returns the minimum interval.
// dsInterval is the string representation of data source min interval, if configured.
// queryInterval is the string representation of query interval (min interval), e.g. "10ms" or "10s".
// queryIntervalMS is a pre-calculated numeric representation of the query interval in milliseconds.
func GetIntervalFrom(dsInterval, queryInterval string, queryIntervalMS int64, defaultInterval time.Duration) (time.Duration, error) {
// Apparently we are setting default value of queryInterval to 0s now
interval := queryInterval
if interval == "0s" {
interval = ""
}
if interval == "" {
if queryIntervalMS != 0 {
return time.Duration(queryIntervalMS) * time.Millisecond, nil
}
}
if interval == "" && dsInterval != "" {
interval = dsInterval
}
if interval == "" {
return defaultInterval, nil
}
parsedInterval, err := ParseIntervalStringToTimeDuration(interval)
if err != nil {
return time.Duration(0), err
}
return parsedInterval, nil
}
// ParseIntervalStringToTimeDuration converts a string representation of a expected (i.e. 1m30s) to time.Duration
// this method copied from grafana/grafana/pkg/tsdb/intervalv2.go
func ParseIntervalStringToTimeDuration(interval string) (time.Duration, error) {
formattedInterval := strings.Replace(strings.Replace(interval, "<", "", 1), ">", "", 1)
isPureNum, err := regexp.MatchString(`^\d+$`, formattedInterval)
if err != nil {
return time.Duration(0), err
}
if isPureNum {
formattedInterval += "s"
}
parsedInterval, err := ParseDuration(formattedInterval)
if err != nil {
return time.Duration(0), err
}
return parsedInterval, nil
}
// RoundInterval returns a predetermined, lower and rounder duration than the given
//
//nolint:gocyclo
func RoundInterval(interval time.Duration) time.Duration {
switch {
// 0.01s
case interval <= 10*time.Millisecond:
return time.Millisecond * 1 // 0.001s
// 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
// 17.5m
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
}
}