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package feed
import (
"fmt"
"net/url"
"strings"
"time"
"github.com/Necoro/gofeed"
"github.com/Necoro/feed2imap-go/internal/feed/filter"
"github.com/Necoro/feed2imap-go/pkg/config"
"github.com/Necoro/feed2imap-go/pkg/log"
)
type Feed struct {
*config.Feed
feed *gofeed.Feed
filter *filter.Filter
items []Item
Global config.GlobalOptions
extID FeedID
}
type FeedID interface {
String() string
}
type FilterFunc func(items []Item, ignHash, alwaysNew bool) []Item
type Descriptor struct {
Name string
Url string
}
func (feed *Feed) Descriptor() Descriptor {
var url string
if feed.Url != "" {
url = feed.Url
} else {
url = "exec://" + strings.Join(feed.Exec, "/")
}
return Descriptor{
Name: feed.Name,
Url: url,
}
}
func (feed *Feed) NeedsUpdate(updateTime time.Time) bool {
if feed.MinFreq == 0 { // shortcut
return true
}
if !updateTime.IsZero() && int(time.Since(updateTime).Hours()) < feed.MinFreq {
log.Printf("Feed '%s' does not need updating, skipping.", feed.Name)
return false
}
return true
}
func (feed *Feed) FetchSuccessful() bool {
return feed.feed != nil
}
func Create(parsedFeed *config.Feed, global config.GlobalOptions) (*Feed, error) {
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)
}
}
return &Feed{Feed: parsedFeed, Global: global, filter: itemFilter}, nil
}
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 {
if log.IsDebug() {
log.Debugf("Filter '%s' matches for item %s", feed.ItemFilter, printItem(item.Item))
}
items = append(items, item)
} else if log.IsDebug() { // printItem is not for free
log.Debugf("Filter '%s' does not match for item %s", feed.ItemFilter, printItem(item.Item))
}
}
return items
}
func (feed *Feed) Filter(filter FilterFunc) {
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
}
feed.items = filter(items, feed.IgnHash, feed.AlwaysNew)
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 (feed *Feed) SetExtID(extID FeedID) {
feed.extID = extID
}
func (feed *Feed) id() string {
if feed.extID == nil {
return feed.Name
}
return feed.extID.String()
}
func (feed *Feed) url() *url.URL {
var feedUrl *url.URL
var err error
if feed.Url != "" {
feedUrl, err = url.Parse(feed.Url)
if err != nil {
panic(fmt.Sprintf("URL '%s' of feed '%s' is not a valid URL. How have we ended up here?", feed.Url, feed.Name))
}
} else if feed.feed.Link != "" {
feedUrl, err = url.Parse(feed.feed.Link)
if err != nil {
panic(fmt.Sprintf("Link '%s' of feed '%s' is not a valid URL.", feed.feed.Link, feed.Name))
}
}
return feedUrl
}
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