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main.go
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main.go
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package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"sync"
"golang.org/x/net/context"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"google.golang.org/api/drive/v3"
)
// Retrieve a token, saves the token, then returns the generated client.
func getClient(config *oauth2.Config) *http.Client {
// The file token.json stores the user's access and refresh tokens, and is
// created automatically when the authorization flow completes for the first
// time.
tokFile := "token.json"
tok, err := tokenFromFile(tokFile)
if err != nil {
tok = getTokenFromWeb(config)
saveToken(tokFile, tok)
}
return config.Client(context.Background(), tok)
}
// Request a token from the web, then returns the retrieved token.
func getTokenFromWeb(config *oauth2.Config) *oauth2.Token {
authURL := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
fmt.Printf("Go to the following link in your browser then type the "+
"authorization code: \n%v\n", authURL)
var authCode string
if _, err := fmt.Scan(&authCode); err != nil {
log.Fatalf("Unable to read authorization code %v", err)
}
tok, err := config.Exchange(context.TODO(), authCode)
if err != nil {
log.Fatalf("Unable to retrieve token from web %v", err)
}
return tok
}
// Retrieves a token from a local file.
func tokenFromFile(file string) (*oauth2.Token, error) {
f, err := os.Open(file)
if err != nil {
return nil, err
}
defer f.Close()
tok := &oauth2.Token{}
err = json.NewDecoder(f).Decode(tok)
return tok, err
}
// Saves a token to a file path.
func saveToken(path string, token *oauth2.Token) {
fmt.Printf("Saving credential file to: %s\n", path)
f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
log.Fatalf("Unable to cache oauth token: %v", err)
}
defer f.Close()
json.NewEncoder(f).Encode(token)
}
type myFile struct {
id string
path string
}
func loadDirContents(
srv *drive.Service,
d *myFile,
dirChan chan<- *myFile,
fileChan chan<- *myFile,
// dirWg *sync.WaitGroup,
) {
for {
q := fmt.Sprintf("'%s' in parents", d.id)
r, err := srv.Files.List().
Q(q).
PageSize(10).
Fields("nextPageToken, files(id, name, mimeType)").Do()
if err != nil {
log.Fatalf("Unable to retrieve files: %v", err)
// log.Fatalf(err.Error())
}
for _, f := range r.Files {
newFile := &myFile{
f.Id,
d.path + "/" + f.Name,
}
if f.MimeType == "application/vnd.google-apps.folder" {
// fmt.Println("Adding directory: ", newFile)
dirChan <- newFile
} else {
// fmt.Println("Adding File: ", newFile)
fileChan <- newFile
}
}
if r.NextPageToken == "" {
break
}
}
if len(dirChan) == 0 {
close(dirChan)
}
}
func onFileExplored(
srv *drive.Service,
d *myFile,
fileWg *sync.WaitGroup,
) {
defer fileWg.Done()
// process file here
}
func main() {
fmt.Println("Hello!")
b, err := ioutil.ReadFile("credentials.json")
if err != nil {
log.Fatalf("Unable to read client secret file: %v", err)
}
// If modifying these scopes, delete your previously saved token.json.
config, err := google.ConfigFromJSON(
b,
drive.DriveMetadataReadonlyScope,
drive.DriveReadonlyScope,
)
if err != nil {
log.Fatalf("Unable to parse client secret file to config: %v", err)
}
client := getClient(config)
srv, err := drive.New(client)
if err != nil {
log.Fatalf("Unable to retrieve Drive client: %v", err)
}
dirChan := make(chan *myFile, 5)
fileChannel := make(chan *myFile, 5)
fmt.Println("Channels created!")
var wg sync.WaitGroup
wg.Add(1)
go func() {
fmt.Println("Started loading directories")
for d := range dirChan {
fmt.Println("Directory found: ", d)
loadDirContents(srv, d, dirChan, fileChannel)
}
close(fileChannel)
wg.Done()
}()
dirChan <- &myFile{
id: "1TWHmapjJP0NfMMmCwjK3qNMjws1mncOn",
path: "",
}
fmt.Println("Started loading files")
for file := range fileChannel {
wg.Add(1)
fmt.Println("File found: ", file)
go onFileExplored(srv, file, &wg)
}
fmt.Println("Waiting...........")
wg.Wait()
fmt.Println("Job Done!")
}