From 7106d5a6e7585dce5fdd552cca30063dd352dc23 Mon Sep 17 00:00:00 2001 From: René 'Necoro' Neumann Date: Mon, 22 Feb 2021 22:54:43 +0100 Subject: Split cache and feed packages --- internal/feed/cache_v1.go | 324 ---------------------------------------------- 1 file changed, 324 deletions(-) delete mode 100644 internal/feed/cache_v1.go (limited to 'internal/feed/cache_v1.go') diff --git a/internal/feed/cache_v1.go b/internal/feed/cache_v1.go deleted file mode 100644 index a80e81c..0000000 --- a/internal/feed/cache_v1.go +++ /dev/null @@ -1,324 +0,0 @@ -package feed - -import ( - "crypto/sha256" - "encoding/base64" - "encoding/hex" - "fmt" - "strconv" - "strings" - "time" - - "github.com/google/uuid" - - "github.com/Necoro/feed2imap-go/pkg/log" - "github.com/Necoro/feed2imap-go/pkg/util" -) - -const ( - v1Version Version = 1 - startFeedId uint64 = 1 -) - -type feedId uint64 - -func (id feedId) String() string { - return strconv.FormatUint(uint64(id), 16) -} - -func idFromString(s string) feedId { - id, _ := strconv.ParseUint(s, 16, 64) - return feedId(id) -} - -type v1Cache struct { - Ids map[feedDescriptor]feedId - NextId uint64 - Feeds map[feedId]*cachedFeed -} - -type cachedFeed struct { - id feedId // not saved, has to be set on loading - LastCheck time.Time - currentCheck time.Time - NumFailures int // can't be named `Failures` b/c it'll collide with the interface - Items []cachedItem - newItems []cachedItem -} - -type itemHash [sha256.Size]byte - -func (h itemHash) String() string { - return hex.EncodeToString(h[:]) -} - -type cachedItem struct { - Guid string - Title string - Link string - Date time.Time - UpdatedCache time.Time - Hash itemHash - ID uuid.UUID -} - -func (item cachedItem) String() string { - return fmt.Sprintf(`{ - ID: %s - Title: %q - Guid: %q - Link: %q - Date: %s - Hash: %s -}`, - base64.RawURLEncoding.EncodeToString(item.ID[:]), - item.Title, item.Guid, item.Link, util.TimeFormat(item.Date), item.Hash) -} - -func (cf *cachedFeed) Checked(withFailure bool) { - cf.currentCheck = time.Now() - if withFailure { - cf.NumFailures++ - } else { - cf.NumFailures = 0 - } -} - -func (cf *cachedFeed) Commit() { - if cf.newItems != nil { - cf.Items = cf.newItems - cf.newItems = nil - } - cf.LastCheck = cf.currentCheck -} - -func (cf *cachedFeed) Failures() int { - return cf.NumFailures -} - -func (cf *cachedFeed) Last() time.Time { - return cf.LastCheck -} - -func (cf *cachedFeed) ID() string { - return cf.id.String() -} - -func (cache *v1Cache) Version() Version { - return v1Version -} - -func (cache *v1Cache) Info() string { - b := strings.Builder{} - for descr, id := range cache.Ids { - b.WriteString(fmt.Sprintf("%3s: %s (%s)\n", id.String(), descr.Name, descr.Url)) - } - return b.String() -} - -func (cache *v1Cache) SpecificInfo(i interface{}) string { - id := idFromString(i.(string)) - - b := strings.Builder{} - feed := cache.Feeds[id] - - for descr, fId := range cache.Ids { - if id == fId { - b.WriteString(descr.Name) - b.WriteString(" -- ") - b.WriteString(descr.Url) - b.WriteByte('\n') - break - } - } - - b.WriteString(fmt.Sprintf(` -Last Check: %s -Num Failures: %d -Num Items: %d -`, - util.TimeFormat(feed.LastCheck), - feed.NumFailures, - len(feed.Items))) - - for _, item := range feed.Items { - b.WriteString("\n--------------------\n") - b.WriteString(item.String()) - } - return b.String() -} - -func newV1Cache() *v1Cache { - cache := v1Cache{ - Ids: map[feedDescriptor]feedId{}, - Feeds: map[feedId]*cachedFeed{}, - NextId: startFeedId, - } - return &cache -} - -func (cache *v1Cache) transformToCurrent() (CacheImpl, error) { - return cache, nil -} - -func (cache *v1Cache) getItem(id feedId) CachedFeed { - feed, ok := cache.Feeds[id] - if !ok { - feed = &cachedFeed{} - cache.Feeds[id] = feed - } - feed.id = id - 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: new '%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: new '%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 -} - -func (item *item) newCachedItem() cachedItem { - var ci cachedItem - - ci.ID = item.itemId - ci.Title = item.Item.Title - ci.Link = item.Item.Link - if item.DateParsed() != nil { - ci.Date = *item.DateParsed() - } - ci.Guid = item.Item.GUID - - contentByte := []byte(item.Item.Description + item.Item.Content) - ci.Hash = sha256.Sum256(contentByte) - - return ci -} - -func (item *cachedItem) similarTo(other *cachedItem, ignoreHash bool) bool { - return other.Title == item.Title && - other.Link == item.Link && - other.Date.Equal(item.Date) && - (ignoreHash || other.Hash == item.Hash) -} - -func (cf *cachedFeed) deleteItem(index int) { - copy(cf.Items[index:], cf.Items[index+1:]) - cf.Items[len(cf.Items)-1] = cachedItem{} - cf.Items = cf.Items[:len(cf.Items)-1] -} - -func (cf *cachedFeed) filterItems(items []item, ignoreHash, alwaysNew bool) []item { - if len(items) == 0 { - return items - } - - cacheItems := make(map[cachedItem]*item, len(items)) - for idx := range items { - // remove complete duplicates on the go - cacheItems[items[idx].newCachedItem()] = &items[idx] - } - log.Debugf("%d items after deduplication", len(cacheItems)) - - filtered := make([]item, 0, len(items)) - cacheadd := make([]cachedItem, 0, len(items)) - app := func(item *item, ci cachedItem, oldIdx *int) { - if oldIdx != nil { - item.updateOnly = true - prevId := cf.Items[*oldIdx].ID - ci.ID = prevId - item.itemId = prevId - log.Debugf("oldIdx: %d, prevId: %s, item.id: %s", *oldIdx, prevId, item.id()) - cf.deleteItem(*oldIdx) - } - filtered = append(filtered, *item) - cacheadd = append(cacheadd, ci) - } - -CACHE_ITEMS: - for ci, item := range cacheItems { - log.Debugf("Now checking %s", ci) - - if ci.Guid != "" { - for idx, oldItem := range cf.Items { - if oldItem.Guid == ci.Guid { - log.Debugf("Guid matches with: %s", oldItem) - if !oldItem.similarTo(&ci, ignoreHash) { - item.addReason("guid (upd)") - app(item, ci, &idx) - } else { - log.Debugf("Similar, ignoring item %s", base64.RawURLEncoding.EncodeToString(oldItem.ID[:])) - } - - continue CACHE_ITEMS - } - } - - log.Debug("Found no matching GUID, including.") - item.addReason("guid") - app(item, ci, nil) - continue - } - - for idx, oldItem := range cf.Items { - if oldItem.similarTo(&ci, ignoreHash) { - log.Debugf("Similarity matches, ignoring: %s", oldItem) - continue CACHE_ITEMS - } - - if oldItem.Link == ci.Link { - if alwaysNew { - log.Debugf("Link matches, but `always-new`.") - item.addReason("always-new") - continue - } - log.Debugf("Link matches, updating: %s", oldItem) - item.addReason("link (upd)") - app(item, ci, &idx) - - continue CACHE_ITEMS - } - } - - log.Debugf("No match found, inserting.") - item.addReason("new") - app(item, ci, nil) - } - - log.Debugf("%d items after filtering", len(filtered)) - - cf.newItems = append(cacheadd, cf.Items...) - - return filtered -} -- cgit v1.2.3-70-g09d2