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|
package feed
import (
"crypto/sha256"
"time"
"github.com/Necoro/feed2imap-go/pkg/log"
)
const (
v1Version Version = 1
startFeedId uint64 = 1
)
type feedId uint64
type v1Cache struct {
Ids map[feedDescriptor]feedId
NextId uint64
Feeds map[feedId]*cachedFeed
}
type cachedFeed struct {
LastCheck time.Time
NumFailures uint // can't be named `Failures` b/c it'll collide with the interface
Items []cachedItem
}
type itemHash [sha256.Size]byte
type cachedItem struct {
Uid string
Title string
Link string
Date time.Time
Updated time.Time
Creator string
Hash itemHash
}
func (cf *cachedFeed) Checked(withFailure bool) {
cf.LastCheck = time.Now()
if withFailure {
cf.NumFailures++
} else {
cf.NumFailures = 0
}
}
func (cf *cachedFeed) Failures() uint {
return cf.NumFailures
}
func (cache *v1Cache) Version() Version {
return v1Version
}
func newV1Cache() *v1Cache {
cache := v1Cache{
Ids: map[feedDescriptor]feedId{},
Feeds: map[feedId]*cachedFeed{},
NextId: startFeedId,
}
return &cache
}
func (cache *v1Cache) transformToCurrent() (Cache, error) {
return cache, nil
}
func (cache *v1Cache) getItem(id feedId) CachedFeed {
feed, ok := cache.Feeds[id]
if !ok {
feed = &cachedFeed{}
cache.Feeds[id] = feed
}
return feed
}
func (cache *v1Cache) findItem(feed *Feed) CachedFeed {
if feed.cached != nil {
return feed.cached.(*cachedFeed)
}
fDescr := feed.descriptor()
id, ok := cache.Ids[fDescr]
if !ok {
var otherId feedDescriptor
changed := false
for otherId, id = range cache.Ids {
if otherId.Name == fDescr.Name {
log.Warnf("Feed %s seems to have changed URLs: newCache '%s', old '%s'. Updating.",
fDescr.Name, fDescr.Url, otherId.Url)
changed = true
break
} else if otherId.Url == fDescr.Url {
log.Warnf("Feed with URL '%s' seems to have changed its name: newCache '%s', old '%s'. Updating",
fDescr.Url, fDescr.Name, otherId.Name)
changed = true
break
}
}
if changed {
delete(cache.Ids, otherId)
} else {
id = feedId(cache.NextId)
cache.NextId++
}
cache.Ids[fDescr] = id
}
item := cache.getItem(id)
feed.cached = item
return item
}
|
