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date_functions.go
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date_functions.go
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package promql
import (
"context"
"fmt"
"time"
"github.com/influxdata/flux/runtime"
"github.com/influxdata/flux/semantic"
"github.com/influxdata/flux/values"
"github.com/pkg/errors"
)
func generateDateFunction(name string, dateFn func(time.Time) int) values.Function {
return values.NewFunction(
name,
runtime.MustLookupBuiltinType("internal/promql", name),
func(ctx context.Context, args values.Object) (values.Value, error) {
v, ok := args.Get("timestamp")
if !ok {
return nil, errors.New("missing argument timestamp")
}
if v.Type().Nature() != semantic.Float {
return nil, fmt.Errorf("cannot convert argument of type %v to float", v.Type().Nature())
}
t := values.Time(v.Float() * 1e9).Time()
return values.NewFloat(float64(dateFn(t))), nil
}, false,
)
}
func init() {
runtime.RegisterPackageValue("internal/promql", "promqlDayOfMonth", generateDateFunction("promqlDayOfMonth", dayOfMonthFn))
runtime.RegisterPackageValue("internal/promql", "promqlDayOfWeek", generateDateFunction("promqlDayOfWeek", dayOfWeekFn))
runtime.RegisterPackageValue("internal/promql", "promqlDaysInMonth", generateDateFunction("promqlDaysInMonth", daysInMonthFn))
runtime.RegisterPackageValue("internal/promql", "promqlHour", generateDateFunction("promqlHour", hourFn))
runtime.RegisterPackageValue("internal/promql", "promqlMinute", generateDateFunction("promqlMinute", minuteFn))
runtime.RegisterPackageValue("internal/promql", "promqlMonth", generateDateFunction("promqlMonth", monthFn))
runtime.RegisterPackageValue("internal/promql", "promqlYear", generateDateFunction("promqlYear", yearFn))
}
func dayOfMonthFn(t time.Time) int {
return t.Day()
}
func dayOfWeekFn(t time.Time) int {
return int(t.Weekday())
}
func daysInMonthFn(t time.Time) int {
return 32 - time.Date(t.Year(), t.Month(), 32, 0, 0, 0, 0, time.UTC).Day()
}
func hourFn(t time.Time) int {
return t.Hour()
}
func minuteFn(t time.Time) int {
return t.Minute()
}
func monthFn(t time.Time) int {
return int(t.Month())
}
func yearFn(t time.Time) int {
return t.Year()
}