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// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package internal
import (
"bytes"
"encoding/json"
"fmt"
"net/http"
"strconv"
"strings"
"time"
)
// JSONString assists in logging JSON: Based on the formatter used to log
// Context contents, the contents could be marshalled as JSON or just printed
// directly.
type JSONString string
// MarshalJSON returns the JSONString unmodified without any escaping.
func (js JSONString) MarshalJSON() ([]byte, error) {
if "" == js {
return []byte("null"), nil
}
return []byte(js), nil
}
func removeFirstSegment(name string) string {
idx := strings.Index(name, "/")
if -1 == idx {
return name
}
return name[idx+1:]
}
func timeToFloatSeconds(t time.Time) float64 {
return float64(t.UnixNano()) / float64(1000*1000*1000)
}
func timeToFloatMilliseconds(t time.Time) float64 {
return float64(t.UnixNano()) / float64(1000*1000)
}
// FloatSecondsToDuration turns a float64 in seconds into a time.Duration.
func FloatSecondsToDuration(seconds float64) time.Duration {
nanos := seconds * 1000 * 1000 * 1000
return time.Duration(nanos) * time.Nanosecond
}
func absTimeDiff(t1, t2 time.Time) time.Duration {
if t1.After(t2) {
return t1.Sub(t2)
}
return t2.Sub(t1)
}
// CompactJSONString removes the whitespace from a JSON string. This function
// will panic if the string provided is not valid JSON. Thus is must only be
// used in testing code!
func CompactJSONString(js string) string {
buf := new(bytes.Buffer)
if err := json.Compact(buf, []byte(js)); err != nil {
panic(fmt.Errorf("unable to compact JSON: %v", err))
}
return buf.String()
}
// GetContentLengthFromHeader gets the content length from a HTTP header, or -1
// if no content length is available.
func GetContentLengthFromHeader(h http.Header) int64 {
if cl := h.Get("Content-Length"); cl != "" {
if contentLength, err := strconv.ParseInt(cl, 10, 64); err == nil {
return contentLength
}
}
return -1
}
// StringLengthByteLimit truncates strings using a byte-limit boundary and
// avoids terminating in the middle of a multibyte character.
func StringLengthByteLimit(str string, byteLimit int) string {
if len(str) <= byteLimit {
return str
}
limitIndex := 0
for pos := range str {
if pos > byteLimit {
break
}
limitIndex = pos
}
return str[0:limitIndex]
}
func timeFromUnixMilliseconds(millis uint64) time.Time {
secs := int64(millis) / 1000
msecsRemaining := int64(millis) % 1000
nsecsRemaining := msecsRemaining * (1000 * 1000)
return time.Unix(secs, nsecsRemaining)
}
// TimeToUnixMilliseconds converts a time into a Unix timestamp in millisecond
// units.
func TimeToUnixMilliseconds(tm time.Time) uint64 {
return uint64(tm.UnixNano()) / uint64(1000*1000)
}
// MinorVersion takes a given version string and returns only the major and
// minor portions of it. If the input is malformed, it returns the input
// untouched.
func MinorVersion(v string) string {
split := strings.SplitN(v, ".", 3)
if len(split) < 2 {
return v
}
return split[0] + "." + split[1]
}
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