reaper/reaper.go
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package reaper
import (
"fmt"
"sort"
"sync"
"time"
"git.j3s.sh/vore/sqlite"
"github.com/SlyMarbo/rss"
)
type Reaper struct {
// internal list of all rss feeds where the map
// key represents the primary id of the key in the db
feeds []rss.Feed
// this mutex is used for locking writes to Feeds
mu sync.Mutex
db *sqlite.DB
}
func Summon(db *sqlite.DB) *Reaper {
var feeds []rss.Feed
reaper := Reaper{
feeds: feeds,
mu: sync.Mutex{},
db: db,
}
return &reaper
}
func (r *Reaper) Start() {
fmt.Println("reaper: starting")
// Make initial url list
urls := r.db.GetAllFeedURLs()
for _, url := range urls {
// Setting UpdateURL lets us defer the actual fetching
feed := rss.Feed{
UpdateURL: url,
}
r.feeds = append(r.feeds, feed)
}
for {
r.UpdateAll()
time.Sleep(2 * time.Hour)
}
}
// Add fetches the given feed url and appends it to r.Feeds
// If the given URL is already in reaper.Feeds, Add will do nothing
func (r *Reaper) Add(url string) error {
for i := range r.feeds {
if r.feeds[i].UpdateURL == url {
return nil
}
}
feed, err := rss.Fetch(url)
if err != nil {
return err
}
r.mu.Lock()
r.feeds = append(r.feeds, *feed)
r.mu.Unlock()
return nil
}
// UpdateAll fetches every feed & attempts updating them
func (r *Reaper) UpdateAll() {
start := time.Now()
fmt.Printf("reaper: fetching %d feeds\n", len(r.feeds))
for i := range r.feeds {
err := r.feeds[i].Update()
if err != nil {
fmt.Println(err)
// TODO: write err to db?
}
}
fmt.Printf("reaper: fetched %d feeds in %s\n",
len(r.feeds), time.Since(start))
}
// GetUserFeeds returns a list of feeds
func (r *Reaper) GetUserFeeds(username string) []rss.Feed {
urls := r.db.GetUserFeedURLs(username)
var result []rss.Feed
for i := range r.feeds {
for _, url := range urls {
if r.feeds[i].UpdateURL == url {
result = append(result, r.feeds[i])
}
}
}
r.SortFeeds(result)
return result
}
func (r *Reaper) SortFeeds(f []rss.Feed) {
sort.Slice(f, func(i, j int) bool {
return f[i].Title < f[j].Title
})
}
func (r *Reaper) SortFeedItems(f []rss.Feed) []rss.Item {
var posts []rss.Item
for _, f := range f {
for _, i := range f.Items {
posts = append(posts, *i)
}
}
// magick slice sorter by date
sort.Slice(posts, func(i, j int) bool {
return posts[i].Date.After(posts[j].Date)
})
return posts
}