Initial QSfera import

Server/vendor/github.com/prometheus/common/helpers/templates/time.go

@@ -0,0 +1,123 @@
+// Copyright 2024 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package templates
+
+import (
+	"errors"
+	"fmt"
+	"math"
+	"strconv"
+	"time"
+
+	"github.com/prometheus/common/model"
+)
+
+var errNaNOrInf = errors.New("value is NaN or Inf")
+
+func ConvertToFloat(i interface{}) (float64, error) {
+	switch v := i.(type) {
+	case float64:
+		return v, nil
+	case string:
+		return strconv.ParseFloat(v, 64)
+	case int:
+		return float64(v), nil
+	case uint:
+		return float64(v), nil
+	case int64:
+		return float64(v), nil
+	case uint64:
+		return float64(v), nil
+	case time.Duration:
+		return v.Seconds(), nil
+	default:
+		return 0, fmt.Errorf("can't convert %T to float", v)
+	}
+}
+
+func FloatToTime(v float64) (*time.Time, error) {
+	if math.IsNaN(v) || math.IsInf(v, 0) {
+		return nil, errNaNOrInf
+	}
+	timestamp := v * 1e9
+	if timestamp > math.MaxInt64 || timestamp < math.MinInt64 {
+		return nil, fmt.Errorf("%v cannot be represented as a nanoseconds timestamp since it overflows int64", v)
+	}
+	t := model.TimeFromUnixNano(int64(timestamp)).Time().UTC()
+	return &t, nil
+}
+
+func HumanizeDuration(i interface{}) (string, error) {
+	v, err := ConvertToFloat(i)
+	if err != nil {
+		return "", err
+	}
+
+	if math.IsNaN(v) || math.IsInf(v, 0) {
+		return fmt.Sprintf("%.4g", v), nil
+	}
+	if v == 0 {
+		return fmt.Sprintf("%.4gs", v), nil
+	}
+	if math.Abs(v) >= 1 {
+		sign := ""
+		if v < 0 {
+			sign = "-"
+			v = -v
+		}
+		duration := int64(v)
+		seconds := duration % 60
+		minutes := (duration / 60) % 60
+		hours := (duration / 60 / 60) % 24
+		days := duration / 60 / 60 / 24
+		// For days to minutes, we display seconds as an integer.
+		if days != 0 {
+			return fmt.Sprintf("%s%dd %dh %dm %ds", sign, days, hours, minutes, seconds), nil
+		}
+		if hours != 0 {
+			return fmt.Sprintf("%s%dh %dm %ds", sign, hours, minutes, seconds), nil
+		}
+		if minutes != 0 {
+			return fmt.Sprintf("%s%dm %ds", sign, minutes, seconds), nil
+		}
+		// For seconds, we display 4 significant digits.
+		return fmt.Sprintf("%s%.4gs", sign, v), nil
+	}
+	prefix := ""
+	for _, p := range []string{"m", "u", "n", "p", "f", "a", "z", "y"} {
+		if math.Abs(v) >= 1 {
+			break
+		}
+		prefix = p
+		v *= 1000
+	}
+	return fmt.Sprintf("%.4g%ss", v, prefix), nil
+}
+
+func HumanizeTimestamp(i interface{}) (string, error) {
+	v, err := ConvertToFloat(i)
+	if err != nil {
+		return "", err
+	}
+
+	tm, err := FloatToTime(v)
+	switch {
+	case errors.Is(err, errNaNOrInf):
+		return fmt.Sprintf("%.4g", v), nil
+	case err != nil:
+		return "", err
+	}
+
+	return fmt.Sprint(tm), nil
+}