lordwelch/gcd_downloader
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Check date from website before downloading

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This commit is contained in:
Timmy Welch 2023-10-23 19:41:43 -07:00
parent 73b59c7c95
commit b72feeb68c
3 changed files with 93 additions and 33 deletions
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10
cmd.go
View File

@ -1,4 +1,5 @@
//go:build !gokrazy
package main
import (
@ -15,6 +16,11 @@ func main() {
}
createDirs()
downlod()
lastUpdate := getLatestDate()
if shouldUpdate(lastUpdate) {
download(lastUpdate)
log.Println("update complete, waiting 1h to check again")
} else {
log.Println("It's too early, waiting 1h to check again")
}
}

10
gokrazy.go
View File

@ -1,4 +1,5 @@
//go:build gokrazy
package main
import (
@ -7,12 +8,10 @@ import (
"os"
"time"
"github.com/gokrazy/gokrazy"
"github.com/antelman107/net-wait-go/wait"
"github.com/gokrazy/gokrazy"
)
func main() {
gokrazy.WaitForClock()
if !wait.New(wait.WithDeadline(time.Minute), wait.WithWait(time.Second), wait.WithBreak(time.Second)).Do([]string{"www.comics.org:443"}) {
@ -26,8 +25,9 @@ func main() {
}
for {
createDirs()
if shouldUpdate() {
downlod()
lastUpdate := getLatestDate()
if shouldUpdate(lastUpdate) {
download(lastUpdate)
log.Println("update complete, waiting 1h to check again")
} else {
log.Println("It's too early, waiting 1h to check again")

84
main.go
View File

@ -3,8 +3,10 @@ package main
import (
"archive/zip"
"context"
"errors"
"flag"
"io"
"io/ioutil"
"log"
"net/http"
"net/http/cookiejar"
@ -31,11 +33,18 @@ func Fatal(a ...any) {
os.Exit(125)
}
func getForm(selector string, resp *http.Response) (action string, form url.Values) {
var body io.Reader = resp.Body
func getReaderFromHTTP(resp *http.Response) io.ReadCloser {
var body io.ReadCloser = resp.Body
if resp.Header.Get("Content-Encoding") == "br" {
body = brotli.NewReader(resp.Body)
body = struct {
io.Reader
io.Closer
}{brotli.NewReader(resp.Body), resp.Body}
}
return body
}
func getForm(selector string, body io.Reader) (action string, form url.Values) {
doc, err := goquery.NewDocumentFromReader(body)
if err != nil {
Fatal(err)
@ -52,6 +61,23 @@ func getForm(selector string, resp *http.Response) (action string, form url.Valu
return action, form
}
func getDate(body io.Reader) (time.Time, error) {
doc, err := goquery.NewDocumentFromReader(body)
if err != nil {
Fatal(err)
}
if sel := doc.Find("#sizing_base > div.body_content > ul:nth-child(13) > li:nth-child(3) > span"); sel != nil && len(sel.Nodes) == 1 {
date, err := time.Parse("2006-01-02 15:04:05", sel.Text())
if err != nil {
return date, err
}
return time.Date(date.Year(), date.Month(), date.Day(), 0, 0, 0, 0, date.Location()), nil
}
Fatal(doc.Html())
return time.UnixMicro(0), errors.New("Failed to find date")
}
func (cl *client) do(ctx context.Context, method string, url string, body io.Reader) (*http.Response, error) {
req, _ := http.NewRequestWithContext(ctx, method, url, body)
req.Header.Set("Referer", cl.referrer)
@ -105,7 +131,8 @@ var (
workDir *string = flag.String("work", "/perm/workDir", "working directory for sqlite files")
)
func downlod() {
func download(current time.Time) {
current = time.Date(current.Year(), current.Month(), current.Day(), 0, 0, 0, 0, current.Location())
u, _ := url.Parse("https://www.comics.org/accounts/login/?next=/download/")
cl := client{&http.Client{}, ""}
cl.Jar, _ = cookiejar.New(&cookiejar.Options{PublicSuffixList: publicsuffix.List})
@ -124,9 +151,10 @@ func downlod() {
action string
form url.Values
)
body := getReaderFromHTTP(resp)
action, form = getForm(`div.body_content > form[action*="/accounts/login/"]`, resp)
resp.Body.Close()
action, form = getForm(`div.body_content > form[action*="/accounts/login/"]`, body)
body.Close()
form.Set("username", os.Getenv("GCD_USERNAME"))
form.Set("password", os.Getenv("GCD_PASSWORD"))
form.Del("")
@ -142,7 +170,23 @@ func downlod() {
if resp.StatusCode != http.StatusOK {
Fatal(resp.Status)
}
action, form = getForm(`div.body_content > form.download`, resp)
by, err := ioutil.ReadAll(getReaderFromHTTP(resp))
if err != nil {
Fatal(err)
}
body2 := strings.NewReader(string(by))
date, err := getDate(body2)
if err != nil {
Fatal(err)
}
if !date.After(current) {
log.Print("No new data found")
return
}
body2.Seek(0, io.SeekStart)
action, form = getForm(`div.body_content > form.download`, body2)
resp.Body.Close()
form.Del("mysqldump")
form.Del("name-value")
@ -175,6 +219,7 @@ func downlod() {
}
log.Println("Download Complete")
// open sqlite file
size, err := file.Seek(0, io.SeekEnd)
if err != nil {
Fatal(err)
@ -189,15 +234,10 @@ func downlod() {
Fatal(err)
}
// determine names and create destination files
sqlite_filename = zipFile.File[0].Name
sqlite_br_filename = zipFile.File[0].Name + ".br"
sqlite, err :=zipFile.File[0].Open()
if err != nil {
Fatal(err)
}
defer sqlite.Close()
sqlite_file, err := os.Create(filepath.Join(*workDir, sqlite_filename))
if err != nil {
Fatal(err)
@ -210,17 +250,26 @@ func downlod() {
}
defer sqlite_br_file.Close()
sqlite, err := zipFile.File[0].Open()
if err != nil {
Fatal(err)
}
defer sqlite.Close()
// read from zip to file in addition to the brotli encoder below
sqlite_reader := io.TeeReader(sqlite, sqlite_file)
br := brotli.NewWriterLevel(sqlite_br_file, 5)
log.Printf("starting compression of %s to %s\n", sqlite_filename, sqlite_br_filename)
// Brotli encodes sqlite file. TeeReader ensures uncompressed copy is also available
_, err = io.Copy(br, sqlite_reader)
if err != nil {
Fatal(err)
}
// rename files to final location
err = os.Rename(filepath.Join(*workDir, sqlite_filename), filepath.Join(*destination, sqlite_filename))
if err != nil {
Fatal(err)
@ -230,6 +279,7 @@ func downlod() {
Fatal(err)
}
// remove temporary zip
err = os.Remove(filepath.Join(*workDir, "temp.zip"))
if err != nil {
Fatal(err)
@ -249,7 +299,7 @@ func createDirs() {
}
}
func shouldUpdate() bool {
func getLatestDate() time.Time {
dir, err := os.Open(*destination)
if err != nil {
Fatal(err)
@ -267,10 +317,14 @@ func shouldUpdate() bool {
}
sort.Strings(names2)
if len(names2) < 1 {
return true
return time.UnixMicro(0)
}
latest := names2[len(names2)-1]
lastUpdate, _ := time.Parse("2006-01-02.db", latest)
return lastUpdate
}
func shouldUpdate(lastUpdate time.Time) bool {
timeTillUpdate := lastUpdate.Sub(time.Now().UTC().AddDate(0, 0, -7))
if lastUpdate.Before(time.Now().UTC().AddDate(0, 0, -7)) {
return true