/
util.go
124 lines (117 loc) · 2.98 KB
/
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 Datadog, Inc.
package tracer
import (
"fmt"
"strconv"
"strings"
"gopkg.in/DataDog/dd-trace-go.v1/internal/samplernames"
)
// 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 int8:
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
case samplernames.SamplerName:
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)
}
func isValidPropagatableTag(k, v string) error {
if len(k) == 0 {
return fmt.Errorf("key length must be greater than zero")
}
for _, ch := range k {
if ch < 32 || ch > 126 || ch == ' ' || ch == '=' || ch == ',' {
return fmt.Errorf("key contains an invalid character %d", ch)
}
}
if len(v) == 0 {
return fmt.Errorf("value length must be greater than zero")
}
for _, ch := range v {
if ch < 32 || ch > 126 || ch == ',' {
return fmt.Errorf("value contains an invalid character %d", ch)
}
}
return nil
}
func parsePropagatableTraceTags(s string) (map[string]string, error) {
if len(s) == 0 {
return nil, nil
}
tags := make(map[string]string)
searchingKey, start := true, 0
var key string
for i, ch := range s {
switch ch {
case '=':
if searchingKey {
if i-start == 0 {
return nil, fmt.Errorf("invalid format")
}
key = s[start:i]
searchingKey, start = false, i+1
}
case ',':
if searchingKey || i-start == 0 {
return nil, fmt.Errorf("invalid format")
}
tags[key] = s[start:i]
searchingKey, start = true, i+1
}
}
if searchingKey || len(s)-start == 0 {
return nil, fmt.Errorf("invalid format")
}
tags[key] = s[start:]
return tags, nil
}