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bulkIt.go
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bulkIt.go
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package bulkIt
import (
"errors"
"fmt"
"io"
"mime"
"net/http"
"os"
"path/filepath"
"time"
"github.com/gabriel-vasile/mimetype"
"github.com/google/uuid"
logger "github.com/sirupsen/logrus"
"github.com/zenthangplus/goccm"
)
type bulkItClient struct {
client *httpClient
maxThreads int
}
type httpClient struct {
client *http.Client
}
/// Create an FileSave object which takes in an http Client to make requests and an integer value which controls the number of threads to be fired.
// If `c` is nil, default http.Client will be assigned.
// If `maxThreads` is 0 then `maxThreads` will default to 30
func NewBulkIt(c *http.Client, maxThreads int) *bulkItClient {
if c == nil {
c = &http.Client{}
}
if maxThreads == 0 {
maxThreads = 30
}
h := &httpClient{
client: c,
}
return &bulkItClient{
client: h,
maxThreads: maxThreads,
}
}
func (c *httpClient) GET(url string) (*http.Response, error) {
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, err
}
resp, err := c.client.Do(req)
if err != nil {
return nil, err
}
return resp, nil
}
func (im *bulkItClient) SaveFilesByUrls(urls []string, path string) {
startTime := time.Now()
c := goccm.New(im.maxThreads)
counter := 0
for i := 0; i < len(urls); i++ {
c.Wait()
go func(i int64) {
err := worker(*im.client, urls[i], path)
if err != nil {
logger.Error("Failed to download url : ", urls[i])
}
if err == nil {
counter += 1
}
fmt.Printf("Downloaded %d of %d \n", i+1, len(urls))
c.Done()
}(int64(i))
}
c.WaitAllDone()
fmt.Printf("%d of %d files downloaded successfully", counter, len(urls))
logger.Info("Time Taken : " + time.Since(startTime).String())
}
func worker(client httpClient, url string, fPath string) (err error) {
if url == "" {
return
}
// fmt.Println("Downloading..." + url)
resp, err := client.GET(url)
if err != nil {
fmt.Println(err.Error())
if resp != nil {
resp.Body.Close()
}
return errors.New(`failed to download. Please check url`)
}
defer resp.Body.Close()
// fmt.Println(resp.Header)
if resp.StatusCode != http.StatusOK {
return errors.New(`failed to download. Please check url`)
}
bodyBytes, err := io.ReadAll(resp.Body)
if err != nil {
fmt.Println(err)
return errors.New(`failed to download. Please check url`)
}
// detectedFileType := http.DetectContentType(bodyBytes)
detectedFileType := mimetype.Detect(bodyBytes).String()
if err != nil {
fmt.Println(err.Error())
return errors.New(`failed to download. Please check url`)
}
fName := uuid.New().String()
// TODO : Use Content-Disposition header for fileName if available
fileName := fName + getFileExtension(detectedFileType)
tmpPath := filepath.Join(fPath, fileName)
if getFileExtension(detectedFileType) == "" {
logger.Error("Failed to get file extension")
return errors.New(`failed to download. Please check url`)
}
newFile, err := os.Create(tmpPath)
if err != nil {
logger.Error(err.Error())
return errors.New(`failed to download. Please check url`)
}
defer newFile.Close()
if _, err = newFile.Write(bodyBytes); err != nil {
logger.Error(err.Error())
return errors.New(`failed to download. Please check url`)
}
return
}
func getFileExtension(mimeType string) (extension string) {
ext, err := mime.ExtensionsByType(mimeType)
if err != nil {
return
}
if len(ext) > 0 {
return ext[len(ext)-1]
}
return ".png"
}