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|
package feed
import (
"encoding/json"
"fmt"
"sync"
"github.com/mmcdole/gofeed"
"github.com/Necoro/feed2imap-go/internal/feed/filter"
"github.com/Necoro/feed2imap-go/pkg/config"
"github.com/Necoro/feed2imap-go/pkg/log"
)
type State struct {
feeds map[string]*Feed
cache Cache
cfg *config.Config
}
func (state *State) Foreach(f func(*Feed)) {
for _, feed := range state.feeds {
f(feed)
}
}
func (state *State) ForeachGo(goFunc func(*Feed)) {
var wg sync.WaitGroup
wg.Add(len(state.feeds))
f := func(feed *Feed, wg *sync.WaitGroup) {
goFunc(feed)
wg.Done()
}
for _, feed := range state.feeds {
go f(feed, &wg)
}
wg.Wait()
}
func (state *State) LoadCache(fileName string, forceNew bool) error {
var (
cache Cache
err error
)
if forceNew {
cache, err = newCache()
} else {
cache, err = loadCache(fileName)
}
if err != nil {
return err
}
state.cache = cache
for _, feed := range state.feeds {
feed.cached = cache.findItem(feed)
}
return nil
}
func (state *State) StoreCache(fileName string) error {
return storeCache(state.cache, fileName)
}
func (state *State) Fetch() int {
state.ForeachGo(handleFeed)
ctr := 0
for _, feed := range state.feeds {
success := feed.FetchSuccessful()
feed.cached.Checked(!success)
if success {
ctr++
}
}
return ctr
}
func printItem(item *gofeed.Item) string {
// analogous to gofeed.Feed.String
json, _ := json.MarshalIndent(item, "", " ")
return string(json)
}
func (feed *Feed) filterItems() []item {
if feed.filter == nil {
return feed.items
}
items := make([]item, 0, len(feed.items))
for _, item := range feed.items {
res, err := feed.filter.Run(item.Item)
if err != nil {
log.Errorf("Feed %s: Item %s: Error applying item filter: %s", feed.Name, printItem(item.Item), err)
res = true // include
}
if res {
items = append(items, item)
} else if log.IsDebug() { // printItem is not for free
log.Debugf("Filter '%s' matches for item %s, removing.", feed.ItemFilter, printItem(item.Item))
}
}
return items
}
func filterFeed(feed *Feed) {
if len(feed.items) > 0 {
origLen := len(feed.items)
log.Debugf("Filtering %s. Starting with %d items", feed.Name, origLen)
items := feed.filterItems()
newLen := len(items)
if newLen < origLen {
log.Printf("Item filter on %s: Reduced from %d to %d items.", feed.Name, origLen, newLen)
origLen = newLen
}
items = feed.cached.filterItems(items, feed.IgnHash, feed.AlwaysNew)
feed.items = items
newLen = len(feed.items)
if newLen < origLen {
log.Printf("Filtered %s. Reduced from %d to %d items.", feed.Name, origLen, newLen)
} else {
log.Printf("Filtered %s, no reduction.", feed.Name)
}
} else {
log.Debugf("No items for %s. No filtering.", feed.Name)
}
}
func (state *State) Filter() {
if log.IsDebug() {
// single threaded for better output
state.Foreach(filterFeed)
} else {
state.ForeachGo(filterFeed)
}
}
func NewState(cfg *config.Config) (*State, error) {
state := State{
feeds: map[string]*Feed{},
cache: nil, // loaded later on
cfg: cfg,
}
for name, parsedFeed := range cfg.Feeds {
var itemFilter *filter.Filter
var err error
if parsedFeed.ItemFilter != "" {
if itemFilter, err = filter.New(parsedFeed.ItemFilter); err != nil {
return nil, fmt.Errorf("Feed %s: Parsing item-filter: %w", parsedFeed.Name, err)
}
}
state.feeds[name] = &Feed{Feed: parsedFeed, Global: cfg.GlobalOptions, filter: itemFilter}
}
return &state, nil
}
func (state *State) RemoveUndue() {
for name, feed := range state.feeds {
if feed.Disable || !feed.NeedsUpdate(feed.cached.Last()) {
delete(state.feeds, name)
}
}
}
func (state *State) NumFeeds() int {
return len(state.feeds)
}
|
