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util.go
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/
util.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016-2020 Datadog, Inc.
package tracer
import (
"strconv"
"strings"
)
// toFloat64 attempts to convert value into a float64. If the value is an integer
// greater or equal to 2^53 or less than or equal to -2^53, it will not be converted
// into a float64 to avoid losing precision. If it succeeds in converting, toFloat64
// returns the value and true, otherwise 0 and false.
func toFloat64(value interface{}) (f float64, ok bool) {
const max = (int64(1) << 53) - 1
const min = -max
switch i := value.(type) {
case byte:
return float64(i), true
case float32:
return float64(i), true
case float64:
return i, true
case int:
return float64(i), true
case int16:
return float64(i), true
case int32:
return float64(i), true
case int64:
if i > max || i < min {
return 0, false
}
return float64(i), true
case uint:
return float64(i), true
case uint16:
return float64(i), true
case uint32:
return float64(i), true
case uint64:
if i > uint64(max) {
return 0, false
}
return float64(i), true
default:
return 0, false
}
}
// parseUint64 parses a uint64 from either an unsigned 64 bit base-10 string
// or a signed 64 bit base-10 string representing an unsigned integer
func parseUint64(str string) (uint64, error) {
if strings.HasPrefix(str, "-") {
id, err := strconv.ParseInt(str, 10, 64)
if err != nil {
return 0, err
}
return uint64(id), nil
}
return strconv.ParseUint(str, 10, 64)
}