// retrieveFeed makes the HTTP GET request to the feed url then parses the xml
// into the models we created
func retrieveFeed(args ...interface{}) interface{} {
res, err := http.Get(args[0].(string))
if err != nil {
log.Fatal("error sending GET to url: ", err)
return feedFetchResult{nil, &_Error{500, "Failed when sending GET request using the url you provided..."}}
}
raw, err := ioutil.ReadAll(res.Body)
res.Body.Close()
if err != nil {
log.Fatal("error reading the response of GET: ", err)
return feedFetchResult{nil, &_Error{500, "Failed when reading the response of GET request using the url you provided..."}}
}
var rssStruct models.RSS
d := xml.NewDecoder(bytes.NewReader(raw))
// using xml.Unmarshal(raw, &rssStruct) for some reason does not parse channel link
// but setting the default name space does the trick http://stackoverflow.com/questions/25332175/golang-rss-xml-parsing-atom10link-overrides-link
d.DefaultSpace = "RssDefault"
e := d.Decode(&rssStruct)
if e != nil {
log.Fatal("error parsing xml: ", e)
return feedFetchResult{nil, &_Error{500, "Failed when processing the xml..."}}
}
feed := models.Feed{}
feed.Title = rssStruct.Channel.Title
feed.Description = rssStruct.Channel.Description
feed.URL = args[0].(string)
feed.LastPubDate = rssStruct.Channel.PubDate
feed.FeedURL = rssStruct.Channel.LinkURL
feed.ImageURL = rssStruct.Channel.Image.URL
log.Print("itunes image url: ", rssStruct.Channel.ITunesImage)
feed.Items = make([]*models.FeedItem, len(rssStruct.Channel.Items))
for i, item := range rssStruct.Channel.Items {
var feedItem models.FeedItem
feedItem.Title = item.Title
feedItem.Description = item.Description
feedItem.URL = item.Link
feedItem.MediaURL = item.Enclosure.URL
feedItem.PubDate = item.PubDate
feed.Items[i] = &feedItem
}
return feedFetchResult{&feed, nil}
}
func (pg *PostgresDBManager) SaveFeed(feed *models.Feed) bool {
var feedStmt, itemStmt *sql.Stmt
var err error
var randID uuid.UUID
// save feed to db
feedStmt, err = pg.db.Prepare("INSERT INTO feeds VALUES($1, $2, $3, $4, $5, $6, $7)")
if err != nil {
log.Fatal(err)
return false
}
// add id
randID, err = uuid.V4()
if err != nil {
log.Fatal(err)
return false
}
feed.ID = randID.String()
_, err = feedStmt.Exec(feed.ID, feed.Title, feed.Description, feed.URL, feed.FeedURL, feed.LastPubDate, feed.ImageURL)
if err != nil {
log.Fatal(err)
return false
}
// save feed Items
itemStmt, err = pg.db.Prepare("INSERT INTO feed_items VALUES($1, $2, $3, $4, $5, $6, $7, $8)")
if err != nil {
log.Fatal(err)
return false
}
for _, item := range feed.Items {
randID, err = uuid.V4()
if err != nil {
log.Fatal(err)
return false
}
item.ID = randID.String()
_, err = itemStmt.Exec(item.ID, item.Title, item.Description, item.URL, item.MediaURL, item.PubDate, item.ImageURL, feed.ID)
if err != nil {
log.Fatal(err)
return false
}
}
return true
}