/
main.go
274 lines (222 loc) · 5.61 KB
/
main.go
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package main
import (
"bufio"
"flag"
"fmt"
"log"
"os"
"os/signal"
"strings"
"sync"
"syscall"
"time"
"github.com/blang/semver"
"github.com/cheggaaa/pb"
)
// VERSION is the current version of the program. It is used for
// checking if blogs need to be force-updated.
//
// This can be changed during the build phase like so:
// go build -ldflags "-X main.VERSION=1.4.1"
var VERSION = "1.4.0"
var (
pBar = pb.New(0)
)
func init() {
loadConfig()
var numDownloaders int
if cfg.NumDownloaders == 0 {
numDownloaders = 10
} else {
numDownloaders = cfg.NumDownloaders
}
var requestRate int
if cfg.RequestRate == 0 {
requestRate = 4
} else {
requestRate = cfg.RequestRate
}
var downloadDirectory string
if len(cfg.DownloadDirectory) == 0 {
downloadDirectory = "."
} else {
downloadDirectory = cfg.DownloadDirectory
}
flag.BoolVar(&cfg.IgnorePhotos, "ignore-photos", cfg.IgnorePhotos, "Ignore any photos found in the selected tumblrs.")
flag.BoolVar(&cfg.IgnoreVideos, "ignore-videos", cfg.IgnoreVideos, "Ignore any videos found in the selected tumblrs.")
flag.BoolVar(&cfg.IgnoreAudio, "ignore-audio", cfg.IgnoreAudio, "Ignore any audio files found in the selected tumblrs.")
flag.BoolVar(&cfg.UseProgressBar, "p", cfg.UseProgressBar, "Use a progress bar to show download status.")
flag.BoolVar(&cfg.ForceCheck, "force", cfg.ForceCheck, "Force checking an entire blog for new files.")
flag.IntVar(&cfg.NumDownloaders, "d", numDownloaders, "Number of simultaneous downloads allowed.")
flag.IntVar(&cfg.RequestRate, "r", requestRate, "Number of requests per second allowed. Do not exceed 15, as tumblr begins throttling at that point.")
flag.StringVar(&cfg.DownloadDirectory, "dir", downloadDirectory, "The directory which will store all downloads.")
cfg.version = semver.MustParse(VERSION)
flag.Parse()
}
func readUserFile() ([]*User, error) {
path := "download.txt"
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer file.Close()
var users []*User
scanner := bufio.NewScanner(file)
for scanner.Scan() {
text := strings.Trim(scanner.Text(), " \n\r\t")
split := strings.SplitN(text, " ", 2)
b, err := newUser(split[0])
if err != nil {
log.Println(err)
continue
}
if len(split) > 1 {
b.tag = split[1]
}
users = append(users, b)
}
// fmt.Println(blogs)
return users, scanner.Err()
}
func getUsersToDownload() []*User {
users := flag.Args()
fileResults, err := readUserFile()
if err != nil {
log.Fatal(err)
}
var userBlogs []*User
for _, user := range users {
u, err := newUser(user)
if err != nil {
log.Println(err)
continue
}
userBlogs = append(userBlogs, u)
}
userBlogs = append(userBlogs, fileResults...)
if len(userBlogs) == 0 {
fmt.Fprintln(os.Stderr, "No users detected.")
os.Exit(1)
}
return userBlogs
}
func verifyFlags() {
if cfg.NumDownloaders < 1 {
log.Println("Invalid number of downloaders, setting to default")
cfg.NumDownloaders = 10
}
if cfg.RequestRate < 1 {
log.Println("Invalid request rate, setting to default")
cfg.RequestRate = 4
}
if cfg.RequestRate > 15 {
log.Println("WARNING: Request rate is over 15 per second. Tumblr may throttle/block you from downloading. Continue at your own risk.")
}
}
func main() {
verifyFlags()
walkblock := make(chan struct{})
go func() {
fmt.Println("Scanning directory")
//filepath.Walk(cfg.DownloadDirectory, DirectoryScanner)
GetAllCurrentFiles()
fmt.Println("Done scanning.")
close(walkblock)
}()
userBlogs := getUsersToDownload()
setupDatabase(userBlogs)
defer database.Close()
// Here, we're done parsing flags.
setupSignalInfo()
<-walkblock
fileChannels := make([]<-chan File, len(userBlogs)) // FIXME: Seems dirty.
for {
limiter := make(chan time.Time, 10*cfg.RequestRate)
ticker := time.NewTicker(time.Second / time.Duration(cfg.RequestRate))
go func() {
for t := range ticker.C {
select {
case limiter <- t:
default:
}
}
}()
// Set up the scraping process.
for i, user := range userBlogs {
fileChan := scrape(user, limiter)
fileChannels[i] = fileChan
}
done := make(chan struct{})
defer close(done)
mergedFiles := merge(done, fileChannels)
// Set up progress bars.
if cfg.UseProgressBar {
pBar.Start()
}
// Set up downloaders.
var downloaderWg sync.WaitGroup
downloaderWg.Add(cfg.NumDownloaders)
for i := 0; i < cfg.NumDownloaders; i++ {
go func(j int) {
downloader(j, limiter, mergedFiles) // mergedFiles will close when scrapers are all done
downloaderWg.Done()
}(i)
}
downloaderWg.Wait() // Waits for all downloads to complete.
if cfg.UseProgressBar {
pBar.Finish()
}
updateDatabaseVersion()
fmt.Println("Downloading complete.")
gStats.PrintStatus()
if !cfg.ServerMode {
break
}
fmt.Println("Sleeping for", cfg.ServerSleep)
time.Sleep(cfg.ServerSleep)
cfg.ForceCheck = false
ticker.Stop()
}
}
func showProgress(s ...interface{}) {
if cfg.UseProgressBar {
pBar.Update()
} else if len(s) > 0 {
fmt.Println(s...)
}
}
func checkError(err error, args ...interface{}) {
if err != nil {
if len(args) != 0 {
log.Println(args, err)
} else {
log.Println(err)
}
}
}
func checkFatalError(err error, args ...interface{}) {
if err != nil {
if len(args) != 0 {
log.Fatal(args, err)
} else {
log.Fatal(err)
}
}
}
func setupSignalInfo() {
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, syscall.SIGINT, syscall.SIGQUIT)
go func() {
for {
s := <-sigChan
switch s {
case syscall.SIGINT:
database.Close()
gStats.PrintStatus()
os.Exit(1)
case syscall.SIGQUIT:
gStats.PrintStatus()
}
}
}()
}