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package crawler
import (
"adammathes.com/neko/models/feed"
"adammathes.com/neko/models/item"
"adammathes.com/neko/vlog"
"github.com/mmcdole/gofeed"
"io/ioutil"
"log"
"net/http"
"time"
)
const MAX_CRAWLERS = 5
func Crawl() {
crawlJobs := make(chan *feed.Feed, 100)
results := make(chan string, 100)
feeds, err := feed.All()
if err != nil {
log.Fatal(err)
}
for i := 0; i < MAX_CRAWLERS; i++ {
vlog.Printf("spawning crawl worker %d\n", i)
go CrawlWorker(crawlJobs, results)
}
for _, f := range feeds {
vlog.Printf("sending crawl job %s\n", f.Url)
crawlJobs <- f
}
close(crawlJobs)
for i := 0; i < len(feeds); i++ {
vlog.Println(<-results)
}
close(results)
}
func CrawlWorker(feeds <-chan *feed.Feed, results chan<- string) {
for f := range feeds {
vlog.Printf("crawl job received %s\n", f.Url)
CrawlFeed(f, results)
vlog.Printf("crawl job finished %s\n", f.Url)
}
}
/*
Simple HTTP Get fnx with custom user agent header
*/
func GetFeedContent(feedURL string) string {
// introduce delays for testing
// n := time.Duration(rand.Int63n(3))
// time.Sleep(n * time.Second)
c := &http.Client{
// give up after 5 seconds
Timeout: 5 * time.Second,
}
request, err := http.NewRequest("GET", feedURL, nil)
if err != nil {
log.Fatalln(err)
}
userAgent := "neko RSS Crawler +https://github.com/adammathes/neko"
request.Header.Set("User-Agent", userAgent)
resp, err := c.Do(request)
if err != nil {
return ""
}
if resp != nil {
defer func() {
ce := resp.Body.Close()
if ce != nil {
err = ce
}
}()
}
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
return ""
}
bodyBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return ""
}
return string(bodyBytes)
}
/*
TODO: sanitize input on crawl
*/
func CrawlFeed(f *feed.Feed, ch chan<- string) {
c := &http.Client{
// give up after 5 seconds
Timeout: 5 * time.Second,
}
fp := gofeed.NewParser()
fp.Client = c
content := GetFeedContent(f.Url)
feed, err := fp.ParseString(content)
if err != nil {
vlog.Println(err)
ch <- "failed parse for " + f.Url + "\n"
return
}
f.Title = feed.Title
f.WebUrl = feed.Link
f.Update()
for _, i := range feed.Items {
vlog.Printf("storing item: %s\n", i.Link)
var item item.Item
item.Title = i.Title
item.Url = i.Link
item.Description = i.Description
if len(i.Content) > len(item.Description) {
item.Description = i.Content
}
// a lot of RSS2.0 generated by wordpress and others
// uses <content:encoded>
e, ok := i.Extensions["content"]["encoded"]
var encoded = ""
if ok {
encoded = e[0].Value
}
if len(encoded) > len(item.Description) {
item.Description = encoded
}
if i.PublishedParsed != nil {
item.PublishDate = i.PublishedParsed.Format("2006-01-02 15:04:05")
} else {
item.PublishDate = time.Now().Format("2006-01-02 15:04:05")
}
item.FeedId = f.Id
err := item.Create()
if err != nil {
vlog.Println(err)
}
// else {
// item.GetFullContent()
//}
}
ch <- "successfully crawled " + f.Url + "\n"
}
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