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/
utils.go
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/
utils.go
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package utils
import (
"archive/tar"
"bytes"
"context"
"fmt"
"io"
"io/ioutil"
"math/rand"
"mime/multipart"
"net/http"
"os"
"runtime"
"strings"
"time"
)
// https://stackoverflow.com/a/31832326
const (
letterIdxBits = 6 // 6 bits to represent a letter index
letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
letterIdxMax = 63 / letterIdxBits // # of letter indices fitting in 63 bits
letterBytes = "abcdefghijklmnopqrstuvwxyz0123456789"
)
type RealRandomString struct {
src rand.Source
}
func NewRealRandomStringProvider() *RealRandomString {
return &RealRandomString{
src: rand.NewSource(time.Now().UnixNano()),
}
}
func (r *RealRandomString) RandomString(n int) string {
sb := strings.Builder{}
sb.Grow(n)
// A src.Int63() generates 63 random bits, enough for letterIdxMax characters!
for i, cache, remain := n-1, r.src.Int63(), letterIdxMax; i >= 0; {
if remain == 0 {
cache, remain = r.src.Int63(), letterIdxMax
}
if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
sb.WriteByte(letterBytes[idx])
i--
}
cache >>= letterIdxBits
remain--
}
return sb.String()
}
func FormatAvatarURL(uid int64, avatar string) string {
if len(avatar) == 0 {
return ""
}
return fmt.Sprintf("https://cdn.discordapp.com/avatars/%d/%s", uid, avatar)
}
func FormatLike(s string) string {
return "%" + s + "%"
}
func WriteTarball(w io.Writer, filePaths []string) error {
tarWriter := tar.NewWriter(w)
defer tarWriter.Close()
for _, filePath := range filePaths {
err := addFileToTarWriter(filePath, tarWriter)
if err != nil {
return fmt.Errorf("add file to tar: %s", err.Error())
}
}
return nil
}
func addFileToTarWriter(filePath string, tarWriter *tar.Writer) error {
file, err := os.Open(filePath)
if err != nil {
return err
}
defer file.Close()
stat, err := file.Stat()
if err != nil {
return err
}
header := &tar.Header{
Name: filePath,
Size: stat.Size(),
Mode: int64(stat.Mode()),
ModTime: stat.ModTime(),
}
err = tarWriter.WriteHeader(header)
if err != nil {
return err
}
_, err = io.Copy(tarWriter, file)
if err != nil {
return err
}
return nil
}
// Unpointify is for template
func Unpointify(s *string) string {
if s == nil {
return ""
}
return *s
}
// Convert size in bytes (123456789B) to a human readable string (Extensions B through EB)
func SizeToString(size int64) string {
const unit = 1000
if size < unit {
return fmt.Sprintf("%d B", size)
}
div, exp := int64(unit), 0
for n := size / unit; n >= unit; n /= unit {
div *= unit
exp++
}
return fmt.Sprintf("%.1f%cB",
float64(size)/float64(div), "kMGTPE"[exp])
}
func SplitMultilineText(s *string) []string {
if s == nil {
return nil
}
return strings.Split(*s, "\n")
}
// NewBucketLimiter creates a ticker channel that fills a bucket with one token every d and has a given capacity for burst usage
func NewBucketLimiter(d time.Duration, capacity int) (chan bool, *time.Ticker) {
bucket := make(chan bool, capacity)
ticker := time.NewTicker(d)
go func() {
for {
<-ticker.C
bucket <- true
}
}()
return bucket, ticker
}
func FileExists(name string) bool {
if _, err := os.Stat(name); err != nil {
if os.IsNotExist(err) {
return false
}
}
return true
}
func CapitalizeASCII(s string) string {
if len(s) == 0 {
return s
}
result := strings.ToUpper(string(s[0]))
result += s[1:]
return result
}
func GetURL(url string) ([]byte, error) {
var client = &http.Client{Timeout: 600 * time.Second}
r, err := client.Get(url)
if err != nil {
return nil, err
}
defer r.Body.Close()
if r.StatusCode != http.StatusOK {
return nil, fmt.Errorf("response not OK: %d", r.StatusCode)
}
var result bytes.Buffer
_, err = io.Copy(&result, r.Body)
if err != nil {
return nil, err
}
return result.Bytes(), nil
}
func GetMemStats() *runtime.MemStats {
m := &runtime.MemStats{}
runtime.ReadMemStats(m)
return m
}
func BoolToString(b bool) string {
if b {
return "yes"
}
return "no"
}
func UploadMultipartFile(ctx context.Context, url string, f io.Reader, filename string) ([]byte, error) {
body, writer := io.Pipe()
client := http.Client{Timeout: 86400 * time.Second}
req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, body)
if err != nil {
return nil, err
}
mwriter := multipart.NewWriter(writer)
req.Header.Add("Content-Type", mwriter.FormDataContentType())
errchan := make(chan error)
LogCtx(ctx).WithField("url", url).Debug("uploading file")
go func() {
defer close(errchan)
defer writer.Close()
defer mwriter.Close()
w, err := mwriter.CreateFormFile("file", filename)
if err != nil {
errchan <- err
return
}
if written, err := io.Copy(w, f); err != nil {
errchan <- fmt.Errorf("error copying %s (%d bytes written): %v", filename, written, err)
return
}
if err := mwriter.Close(); err != nil {
errchan <- err
return
}
}()
resp, err := client.Do(req)
merr := <-errchan
if resp != nil && resp.Body != nil {
defer resp.Body.Close()
}
if err != nil || merr != nil {
return nil, fmt.Errorf("http error: %v, multipart error: %v", err, merr)
}
bodyBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
// Check the response
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("upload to remote error: %s", string(bodyBytes))
}
LogCtx(ctx).WithField("url", url).Debug("response OK")
return bodyBytes, nil
}
type ValueOnlyContext struct {
context.Context
}
func (ValueOnlyContext) Deadline() (deadline time.Time, ok bool) {
return
}
func (ValueOnlyContext) Done() <-chan struct{} {
return nil
}
func (ValueOnlyContext) Err() error {
return nil
}
func Int64Ptr(n int64) *int64 {
return &n
}
func StrPtr(s string) *string {
return &s
}
func NilTime(t *time.Time) time.Time {
if t == nil {
return time.Time{}
}
return *t
}