[bugfix] more robust list timeline invalidation (#1995)

internal/api/util/parsequery.go

@@ -73,7 +73,14 @@ func requiredError(key string) gtserror.WithCode {
 */
 
 func ParseLimit(value string, defaultValue int, max, min int) (int, gtserror.WithCode) {
-	return parseInt(value, defaultValue, max, min, LimitKey)
+	i, err := parseInt(value, defaultValue, max, min, LimitKey)
+	if err != nil {
+		return 0, err
+	} else if i == 0 {
+		// treat 0 as an empty query
+		return defaultValue, nil
+	}
+	return i, nil
 }
 
 func ParseLocal(value string, defaultValue bool) (bool, gtserror.WithCode) {

internal/cache/cache.go

@@ -93,13 +93,14 @@ func (c *Caches) setuphooks() {
 	})
 
 	c.GTS.EmojiCategory().SetInvalidateCallback(func(category *gtsmodel.EmojiCategory) {
-		// Invalidate entire emoji cache,
+		// Invalidate any emoji in this category.
-		// as we can't know which emojis
+		c.GTS.Emoji().Invalidate("CategoryID", category.ID)
-		// specifically this will effect.
-		c.GTS.Emoji().Clear()
 	})
 
 	c.GTS.Follow().SetInvalidateCallback(func(follow *gtsmodel.Follow) {
+		// Invalidate any related list entries.
+		c.GTS.ListEntry().Invalidate("FollowID", follow.ID)
+
 		// Invalidate follow origin account ID cached visibility.
 		c.Visibility.Invalidate("ItemID", follow.AccountID)
 		c.Visibility.Invalidate("RequesterID", follow.AccountID)
@@ -122,6 +123,11 @@ func (c *Caches) setuphooks() {
 		c.GTS.Follow().Invalidate("ID", followReq.ID)
 	})
 
+	c.GTS.List().SetInvalidateCallback(func(list *gtsmodel.List) {
+		// Invalidate all cached entries of this list.
+		c.GTS.ListEntry().Invalidate("ListID", list.ID)
+	})
+
 	c.GTS.Status().SetInvalidateCallback(func(status *gtsmodel.Status) {
 		// Invalidate status ID cached visibility.
 		c.Visibility.Invalidate("ItemID", status.ID)

internal/cache/gts.go

@@ -262,6 +262,7 @@ func (c *GTSCaches) initEmoji() {
 		{Name: "URI"},
 		{Name: "Shortcode.Domain"},
 		{Name: "ImageStaticURL"},
+		{Name: "CategoryID", Multi: true},
 	}, func(e1 *gtsmodel.Emoji) *gtsmodel.Emoji {
 		e2 := new(gtsmodel.Emoji)
 		*e2 = *e1
@@ -338,6 +339,8 @@ func (c *GTSCaches) initList() {
 func (c *GTSCaches) initListEntry() {
 	c.listEntry = result.New([]result.Lookup{
 		{Name: "ID"},
+		{Name: "ListID", Multi: true},
+		{Name: "FollowID", Multi: true},
 	}, func(l1 *gtsmodel.ListEntry) *gtsmodel.ListEntry {
 		l2 := new(gtsmodel.ListEntry)
 		*l2 = *l1

internal/db/bundb/list.go

@@ -41,33 +41,6 @@ type listDB struct {
 	LIST FUNCTIONS
 */
 
-func (l *listDB) getList(ctx context.Context, lookup string, dbQuery func(*gtsmodel.List) error, keyParts ...any) (*gtsmodel.List, error) {
-	list, err := l.state.Caches.GTS.List().Load(lookup, func() (*gtsmodel.List, error) {
-		var list gtsmodel.List
-
-		// Not cached! Perform database query.
-		if err := dbQuery(&list); err != nil {
-			return nil, l.conn.ProcessError(err)
-		}
-
-		return &list, nil
-	}, keyParts...)
-	if err != nil {
-		return nil, err // already processed
-	}
-
-	if gtscontext.Barebones(ctx) {
-		// Only a barebones model was requested.
-		return list, nil
-	}
-
-	if err := l.state.DB.PopulateList(ctx, list); err != nil {
-		return nil, err
-	}
-
-	return list, nil
-}
-
 func (l *listDB) GetListByID(ctx context.Context, id string) (*gtsmodel.List, error) {
 	return l.getList(
 		ctx,
@@ -82,6 +55,34 @@ func(list *gtsmodel.List) error {
 	)
 }
 
+func (l *listDB) getList(ctx context.Context, lookup string, dbQuery func(*gtsmodel.List) error, keyParts ...any) (*gtsmodel.List, error) {
+	list, err := l.state.Caches.GTS.List().Load(lookup, func() (*gtsmodel.List, error) {
+		var list gtsmodel.List
+
+		// Not cached! Perform database query.
+		if err := dbQuery(&list); err != nil {
+			return nil, l.conn.ProcessError(err)
+		}
+
+		return &list, nil
+	}, keyParts...)
+	if err != nil {
+		// already processed
+		return nil, err
+	}
+
+	if gtscontext.Barebones(ctx) {
+		// Only a barebones model was requested.
+		return list, nil
+	}
+
+	if err := l.state.DB.PopulateList(ctx, list); err != nil {
+		return nil, err
+	}
+
+	return list, nil
+}
+
 func (l *listDB) GetListsForAccountID(ctx context.Context, accountID string) ([]*gtsmodel.List, error) {
 	// Fetch IDs of all lists owned by this account.
 	var listIDs []string
@@ -107,8 +108,6 @@ func (l *listDB) GetListsForAccountID(ctx context.Context, accountID string) ([]
 			log.Errorf(ctx, "error fetching list %q: %v", id, err)
 			continue
 		}
-
-		// Append list.
 		lists = append(lists, list)
 	}
 
@@ -161,49 +160,89 @@ func (l *listDB) UpdateList(ctx context.Context, list *gtsmodel.List, columns ..
 		columns = append(columns, "updated_at")
 	}
 
+	defer func() {
+		// Invalidate all entries for this list ID.
+		l.state.Caches.GTS.ListEntry().Invalidate("ListID", list.ID)
+
+		// Invalidate this entire list's timeline.
+		if err := l.state.Timelines.List.RemoveTimeline(ctx, list.ID); err != nil {
+			log.Errorf(ctx, "error invalidating list timeline: %q", err)
+		}
+	}()
+
 	return l.state.Caches.GTS.List().Store(list, func() error {
-		if _, err := l.conn.NewUpdate().
+		_, err := l.conn.NewUpdate().
 			Model(list).
 			Where("? = ?", bun.Ident("list.id"), list.ID).
 			Column(columns...).
-			Exec(ctx); err != nil {
+			Exec(ctx)
-			return l.conn.ProcessError(err)
+		return l.conn.ProcessError(err)
-		}
-
-		return nil
 	})
 }
 
 func (l *listDB) DeleteListByID(ctx context.Context, id string) error {
-	defer l.state.Caches.GTS.List().Invalidate("ID", id)
+	// Load list by ID into cache to ensure we can perform
-
+	// all necessary cache invalidation hooks on removal.
-	// Select all entries that belong to this list.
+	_, err := l.GetListByID(
-	listEntries, err := l.state.DB.GetListEntries(ctx, id, "", "", "", 0)
+		// Don't populate the entry;
+		// we only want the list ID.
+		gtscontext.SetBarebones(ctx),
+		id,
+	)
 	if err != nil {
-		return fmt.Errorf("error selecting entries from list %q: %w", id, err)
+		if errors.Is(err, db.ErrNoEntries) {
+			// Already gone.
+			return nil
+		}
+		return err
 	}
 
-	// Delete each list entry. This will
+	defer func() {
-	// invalidate the list timeline too.
+		// Invalidate this list from cache.
-	for _, listEntry := range listEntries {
+		l.state.Caches.GTS.List().Invalidate("ID", id)
-		err := l.state.DB.DeleteListEntry(ctx, listEntry.ID)
+
-		if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		// Invalidate this entire list's timeline.
+		if err := l.state.Timelines.List.RemoveTimeline(ctx, id); err != nil {
+			log.Errorf(ctx, "error invalidating list timeline: %q", err)
+		}
+	}()
+
+	return l.conn.RunInTx(ctx, func(tx bun.Tx) error {
+		// Delete all entries attached to list.
+		if _, err := tx.NewDelete().
+			Table("list_entries").
+			Where("? = ?", bun.Ident("list_id"), id).
+			Exec(ctx); err != nil {
 			return err
 		}
-	}
 
-	// Finally delete list itself from DB.
+		// Delete the list itself.
-	_, err = l.conn.NewDelete().
+		_, err := tx.NewDelete().
-		Table("lists").
+			Table("lists").
-		Where("? = ?", bun.Ident("id"), id).
+			Where("? = ?", bun.Ident("id"), id).
-		Exec(ctx)
+			Exec(ctx)
-	return l.conn.ProcessError(err)
+		return err
+	})
 }
 
 /*
 	LIST ENTRY functions
 */
 
+func (l *listDB) GetListEntryByID(ctx context.Context, id string) (*gtsmodel.ListEntry, error) {
+	return l.getListEntry(
+		ctx,
+		"ID",
+		func(listEntry *gtsmodel.ListEntry) error {
+			return l.conn.NewSelect().
+				Model(listEntry).
+				Where("? = ?", bun.Ident("list_entry.id"), id).
+				Scan(ctx)
+		},
+		id,
+	)
+}
+
 func (l *listDB) getListEntry(ctx context.Context, lookup string, dbQuery func(*gtsmodel.ListEntry) error, keyParts ...any) (*gtsmodel.ListEntry, error) {
 	listEntry, err := l.state.Caches.GTS.ListEntry().Load(lookup, func() (*gtsmodel.ListEntry, error) {
 		var listEntry gtsmodel.ListEntry
@@ -232,20 +271,6 @@ func (l *listDB) getListEntry(ctx context.Context, lookup string, dbQuery func(*
 	return listEntry, nil
 }
 
-func (l *listDB) GetListEntryByID(ctx context.Context, id string) (*gtsmodel.ListEntry, error) {
-	return l.getListEntry(
-		ctx,
-		"ID",
-		func(listEntry *gtsmodel.ListEntry) error {
-			return l.conn.NewSelect().
-				Model(listEntry).
-				Where("? = ?", bun.Ident("list_entry.id"), id).
-				Scan(ctx)
-		},
-		id,
-	)
-}
-
 func (l *listDB) GetListEntries(ctx context.Context,
 	listID string,
 	maxID string,
@@ -328,8 +353,6 @@ func (l *listDB) GetListEntries(ctx context.Context,
 			log.Errorf(ctx, "error fetching list entry %q: %v", id, err)
 			continue
 		}
-
-		// Append list entries.
 		listEntries = append(listEntries, listEntry)
 	}
 
@@ -337,7 +360,7 @@ func (l *listDB) GetListEntries(ctx context.Context,
 }
 
 func (l *listDB) GetListEntriesForFollowID(ctx context.Context, followID string) ([]*gtsmodel.ListEntry, error) {
-	entryIDs := []string{}
+	var entryIDs []string
 
 	if err := l.conn.
 		NewSelect().
@@ -362,8 +385,6 @@ func (l *listDB) GetListEntriesForFollowID(ctx context.Context, followID string)
 			log.Errorf(ctx, "error fetching list entry %q: %v", id, err)
 			continue
 		}
-
-		// Append list entries.
 		listEntries = append(listEntries, listEntry)
 	}
 
@@ -387,33 +408,42 @@ func (l *listDB) PopulateListEntry(ctx context.Context, listEntry *gtsmodel.List
 	return nil
 }
 
-func (l *listDB) PutListEntries(ctx context.Context, listEntries []*gtsmodel.ListEntry) error {
+func (l *listDB) PutListEntries(ctx context.Context, entries []*gtsmodel.ListEntry) error {
-	return l.conn.RunInTx(ctx, func(tx bun.Tx) error {
+	defer func() {
-		for _, listEntry := range listEntries {
+		// Collect unique list IDs from the entries.
-			if _, err := tx.
+		listIDs := collate(func(i int) string {
-				NewInsert().
+			return entries[i].ListID
-				Model(listEntry).
+		}, len(entries))
-				Exec(ctx); err != nil {
-				return err
-			}
 
+		for _, id := range listIDs {
 			// Invalidate the timeline for the list this entry belongs to.
-			if err := l.state.Timelines.List.RemoveTimeline(ctx, listEntry.ListID); err != nil {
+			if err := l.state.Timelines.List.RemoveTimeline(ctx, id); err != nil {
-				log.Errorf(ctx, "PutListEntries: error invalidating list timeline: %q", err)
+				log.Errorf(ctx, "error invalidating list timeline: %q", err)
 			}
 		}
+	}()
 
+	// Finally, insert each list entry into the database.
+	return l.conn.RunInTx(ctx, func(tx bun.Tx) error {
+		for _, entry := range entries {
+			if err := l.state.Caches.GTS.ListEntry().Store(entry, func() error {
+				_, err := tx.
+					NewInsert().
+					Model(entry).
+					Exec(ctx)
+				return err
+			}); err != nil {
+				return err
+			}
+		}
 		return nil
 	})
 }
 
 func (l *listDB) DeleteListEntry(ctx context.Context, id string) error {
-	defer l.state.Caches.GTS.ListEntry().Invalidate("ID", id)
+	// Load list entry into cache to ensure we can perform
-
+	// all necessary cache invalidation hooks on removal.
-	// Load list entry into cache before attempting a delete,
+	entry, err := l.GetListEntryByID(
-	// as we need the followID from it in order to trigger
-	// timeline invalidation.
-	listEntry, err := l.GetListEntryByID(
 		// Don't populate the entry;
 		// we only want the list ID.
 		gtscontext.SetBarebones(ctx),
@@ -428,36 +458,39 @@ func (l *listDB) DeleteListEntry(ctx context.Context, id string) error {
 	}
 
 	defer func() {
+		// Invalidate this list entry upon delete.
+		l.state.Caches.GTS.ListEntry().Invalidate("ID", id)
+
 		// Invalidate the timeline for the list this entry belongs to.
-		if err := l.state.Timelines.List.RemoveTimeline(ctx, listEntry.ListID); err != nil {
+		if err := l.state.Timelines.List.RemoveTimeline(ctx, entry.ListID); err != nil {
-			log.Errorf(ctx, "DeleteListEntry: error invalidating list timeline: %q", err)
+			log.Errorf(ctx, "error invalidating list timeline: %q", err)
 		}
 	}()
 
-	if _, err := l.conn.NewDelete().
+	// Finally delete the list entry.
+	_, err = l.conn.NewDelete().
 		Table("list_entries").
-		Where("? = ?", bun.Ident("id"), listEntry.ID).
+		Where("? = ?", bun.Ident("id"), id).
-		Exec(ctx); err != nil {
+		Exec(ctx)
-		return l.conn.ProcessError(err)
+	return err
-	}
-
-	return nil
 }
 
 func (l *listDB) DeleteListEntriesForFollowID(ctx context.Context, followID string) error {
-	// Fetch IDs of all entries that pertain to this follow.
+	var entryIDs []string
-	var listEntryIDs []string
+
+	// Fetch entry IDs for follow ID.
 	if err := l.conn.
 		NewSelect().
-		TableExpr("? AS ?", bun.Ident("list_entries"), bun.Ident("list_entry")).
+		Table("list_entries").
-		Column("list_entry.id").
+		Column("id").
-		Where("? = ?", bun.Ident("list_entry.follow_id"), followID).
+		Where("? = ?", bun.Ident("follow_id"), followID).
-		Order("list_entry.id DESC").
+		Order("id DESC").
-		Scan(ctx, &listEntryIDs); err != nil {
+		Scan(ctx, &entryIDs); err != nil {
 		return l.conn.ProcessError(err)
 	}
 
-	for _, id := range listEntryIDs {
+	for _, id := range entryIDs {
+		// Delete each separately to trigger cache invalidations.
 		if err := l.DeleteListEntry(ctx, id); err != nil {
 			return err
 		}
@@ -465,3 +498,24 @@ func (l *listDB) DeleteListEntriesForFollowID(ctx context.Context, followID stri
 
 	return nil
 }
+
+// collate will collect the values of type T from an expected slice of length 'len',
+// passing the expected index to each call of 'get' and deduplicating the end result.
+func collate[T comparable](get func(int) T, len int) []T {
+	ts := make([]T, 0, len)
+	tm := make(map[T]struct{}, len)
+
+	for i := 0; i < len; i++ {
+		// Get next.
+		t := get(i)
+
+		if _, ok := tm[t]; !ok {
+			// New value, add
+			// to map + slice.
+			ts = append(ts, t)
+			tm[t] = struct{}{}
+		}
+	}
+
+	return ts
+}

internal/db/bundb/relationship_follow.go

@@ -328,7 +328,8 @@ func (r *relationshipDB) DeleteAccountFollows(ctx context.Context, accountID str
 		}
 
 		// Delete each follow from DB.
-		if err := r.deleteFollow(ctx, follow.ID); err != nil && !errors.Is(err, db.ErrNoEntries) {
+		if err := r.deleteFollow(ctx, follow.ID); err != nil &&
+			!errors.Is(err, db.ErrNoEntries) {
 			return err
 		}
 	}

internal/processing/account/bookmarks.go

@@ -82,6 +82,7 @@ func (p *Processor) BookmarksGet(ctx context.Context, requestingAccount *gtsmode
 		if bookmark.ID < nextMaxIDValue {
 			nextMaxIDValue = bookmark.ID // Lowest ID (for paging down).
 		}
+
 		if bookmark.ID > prevMinIDValue {
 			prevMinIDValue = bookmark.ID // Highest ID (for paging up).
 		}

internal/processing/account/statuses.go

@@ -93,28 +93,21 @@ func (p *Processor) StatusesGet(
 	}
 
 	var (
-		items          = make([]interface{}, 0, count)
+		items = make([]interface{}, 0, count)
-		nextMaxIDValue string
-		prevMinIDValue string
-	)
 
-	for i, s := range filtered {
 		// Set next + prev values before filtering and API
 		// converting, so caller can still page properly.
-		if i == count-1 {
+		nextMaxIDValue = filtered[count-1].ID
-			nextMaxIDValue = s.ID
+		prevMinIDValue = filtered[0].ID
-		}
+	)
-
-		if i == 0 {
-			prevMinIDValue = s.ID
-		}
 
+	for _, s := range filtered {
+		// Convert filtered statuses to API statuses.
 		item, err := p.tc.StatusToAPIStatus(ctx, s, requestingAccount)
 		if err != nil {
-			log.Debugf(ctx, "skipping status %s because it couldn't be converted to its api representation: %s", s.ID, err)
+			log.Errorf(ctx, "error convering to api status: %v", err)
 			continue
 		}
-
 		items = append(items, item)
 	}
 
@@ -171,23 +164,20 @@ func (p *Processor) WebStatusesGet(ctx context.Context, targetAccountID string,
 	}
 
 	var (
-		items          = make([]interface{}, 0, count)
+		items = make([]interface{}, 0, count)
-		nextMaxIDValue string
-	)
 
-	for i, s := range statuses {
 		// Set next value before API converting,
 		// so caller can still page properly.
-		if i == count-1 {
+		nextMaxIDValue = statuses[count-1].ID
-			nextMaxIDValue = s.ID
+	)
-		}
 
+	for _, s := range statuses {
+		// Convert fetched statuses to API statuses.
 		item, err := p.tc.StatusToAPIStatus(ctx, s, nil)
 		if err != nil {
-			log.Debugf(ctx, "skipping status %s because it couldn't be converted to its api representation: %s", s.ID, err)
+			log.Errorf(ctx, "error convering to api status: %v", err)
 			continue
 		}
-
 		items = append(items, item)
 	}
 

internal/processing/admin/report.go

@@ -54,22 +54,14 @@ func (p *Processor) ReportsGet(
 
 	count := len(reports)
 	items := make([]interface{}, 0, count)
-	nextMaxIDValue := ""
+	nextMaxIDValue := reports[count-1].ID
-	prevMinIDValue := ""
+	prevMinIDValue := reports[0].ID
-	for i, r := range reports {
+
+	for _, r := range reports {
 		item, err := p.tc.ReportToAdminAPIReport(ctx, r, account)
 		if err != nil {
 			return nil, gtserror.NewErrorInternalError(fmt.Errorf("error converting report to api: %s", err))
 		}
-
-		if i == count-1 {
-			nextMaxIDValue = item.ID
-		}
-
-		if i == 0 {
-			prevMinIDValue = item.ID
-		}
-
 		items = append(items, item)
 	}
 

internal/processing/list/delete.go

@@ -27,7 +27,8 @@
 
 // Delete deletes one list for the given account.
 func (p *Processor) Delete(ctx context.Context, account *gtsmodel.Account, id string) gtserror.WithCode {
-	list, errWithCode := p.getList(
+	// Ensure list exists + is owned by requesting account.
+	_, errWithCode := p.getList(
 		// Use barebones ctx; no embedded
 		// structs necessary for this call.
 		gtscontext.SetBarebones(ctx),
@@ -38,7 +39,7 @@ func (p *Processor) Delete(ctx context.Context, account *gtsmodel.Account, id st
 		return errWithCode
 	}
 
-	if err := p.state.DB.DeleteListByID(ctx, list.ID); err != nil {
+	if err := p.state.DB.DeleteListByID(ctx, id); err != nil {
 		return gtserror.NewErrorInternalError(err)
 	}
 

internal/processing/list/get.go

@@ -87,7 +87,14 @@ func (p *Processor) GetListAccounts(
 	limit int,
 ) (*apimodel.PageableResponse, gtserror.WithCode) {
 	// Ensure list exists + is owned by requesting account.
-	if _, errWithCode := p.getList(ctx, account.ID, listID); errWithCode != nil {
+	_, errWithCode := p.getList(
+		// Use barebones ctx; no embedded
+		// structs necessary for this call.
+		gtscontext.SetBarebones(ctx),
+		account.ID,
+		listID,
+	)
+	if errWithCode != nil {
 		return nil, errWithCode
 	}
 
@@ -106,9 +113,12 @@ func (p *Processor) GetListAccounts(
 	}
 
 	var (
-		items          = make([]interface{}, count)
+		items = make([]interface{}, 0, count)
-		nextMaxIDValue string
+
-		prevMinIDValue string
+		// Set next + prev values before filtering and API
+		// converting, so caller can still page properly.
+		nextMaxIDValue = listEntries[count-1].ID
+		prevMinIDValue = listEntries[0].ID
 	)
 
 	// For each list entry, we want the account it points to.
@@ -117,37 +127,29 @@ func (p *Processor) GetListAccounts(
 	// from that follow.
 	//
 	// We do paging not by account ID, but by list entry ID.
-	for i, listEntry := range listEntries {
+	for _, listEntry := range listEntries {
-		if i == count-1 {
-			nextMaxIDValue = listEntry.ID
-		}
-
-		if i == 0 {
-			prevMinIDValue = listEntry.ID
-		}
-
 		if err := p.state.DB.PopulateListEntry(ctx, listEntry); err != nil {
-			log.Debugf(ctx, "skipping list entry because of error populating it: %q", err)
+			log.Errorf(ctx, "error populating list entry: %v", err)
 			continue
 		}
 
 		if err := p.state.DB.PopulateFollow(ctx, listEntry.Follow); err != nil {
-			log.Debugf(ctx, "skipping list entry because of error populating follow: %q", err)
+			log.Errorf(ctx, "error populating follow: %v", err)
 			continue
 		}
 
 		apiAccount, err := p.tc.AccountToAPIAccountPublic(ctx, listEntry.Follow.TargetAccount)
 		if err != nil {
-			log.Debugf(ctx, "skipping list entry because of error converting follow target account: %q", err)
+			log.Errorf(ctx, "error converting to public api account: %v", err)
 			continue
 		}
 
-		items[i] = apiAccount
+		items = append(items, apiAccount)
 	}
 
 	return util.PackagePageableResponse(util.PageableResponseParams{
 		Items:          items,
-		Path:           "api/v1/lists/" + listID + "/accounts",
+		Path:           "/api/v1/lists/" + listID + "/accounts",
 		NextMaxIDValue: nextMaxIDValue,
 		PrevMinIDValue: prevMinIDValue,
 		Limit:          limit,

internal/processing/report/get.go

@@ -19,6 +19,7 @@
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"strconv"
 
@@ -64,31 +65,24 @@ func (p *Processor) GetMultiple(
 	limit int,
 ) (*apimodel.PageableResponse, gtserror.WithCode) {
 	reports, err := p.state.DB.GetReports(ctx, resolved, account.ID, targetAccountID, maxID, sinceID, minID, limit)
-	if err != nil {
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
-		if err == db.ErrNoEntries {
-			return util.EmptyPageableResponse(), nil
-		}
 		return nil, gtserror.NewErrorInternalError(err)
 	}
 
 	count := len(reports)
+	if count == 0 {
+		return util.EmptyPageableResponse(), nil
+	}
+
 	items := make([]interface{}, 0, count)
-	nextMaxIDValue := ""
+	nextMaxIDValue := reports[count-1].ID
-	prevMinIDValue := ""
+	prevMinIDValue := reports[0].ID
-	for i, r := range reports {
+
+	for _, r := range reports {
 		item, err := p.tc.ReportToAPIReport(ctx, r)
 		if err != nil {
 			return nil, gtserror.NewErrorInternalError(fmt.Errorf("error converting report to api: %s", err))
 		}
-
-		if i == count-1 {
-			nextMaxIDValue = item.ID
-		}
-
-		if i == 0 {
-			prevMinIDValue = item.ID
-		}
-
 		items = append(items, item)
 	}
 

internal/processing/timeline/faved.go

@@ -46,7 +46,7 @@ func (p *Processor) FavedTimelineGet(ctx context.Context, authed *oauth.Auth, ma
 	for _, s := range statuses {
 		visible, err := p.filter.StatusVisible(ctx, authed.Account, s)
 		if err != nil {
-			log.Debugf(ctx, "skipping status %s because of an error checking status visibility: %s", s.ID, err)
+			log.Errorf(ctx, "error checking status visibility: %v", err)
 			continue
 		}
 
@@ -56,7 +56,7 @@ func (p *Processor) FavedTimelineGet(ctx context.Context, authed *oauth.Auth, ma
 
 		apiStatus, err := p.tc.StatusToAPIStatus(ctx, s, authed.Account)
 		if err != nil {
-			log.Debugf(ctx, "skipping status %s because it couldn't be converted to its api representation: %s", s.ID, err)
+			log.Errorf(ctx, "error convering to api status: %v", err)
 			continue
 		}
 
@@ -65,7 +65,7 @@ func (p *Processor) FavedTimelineGet(ctx context.Context, authed *oauth.Auth, ma
 
 	return util.PackagePageableResponse(util.PageableResponseParams{
 		Items:          items,
-		Path:           "api/v1/favourites",
+		Path:           "/api/v1/favourites",
 		NextMaxIDValue: nextMaxID,
 		PrevMinIDValue: prevMinID,
 		Limit:          limit,

internal/processing/timeline/home.go

@@ -116,25 +116,17 @@ func (p *Processor) HomeTimelineGet(ctx context.Context, authed *oauth.Auth, max
 
 	var (
 		items          = make([]interface{}, count)
-		nextMaxIDValue string
+		nextMaxIDValue = statuses[count-1].GetID()
-		prevMinIDValue string
+		prevMinIDValue = statuses[0].GetID()
 	)
 
-	for i, item := range statuses {
+	for i := range statuses {
-		if i == count-1 {
+		items[i] = statuses[i]
-			nextMaxIDValue = item.GetID()
-		}
-
-		if i == 0 {
-			prevMinIDValue = item.GetID()
-		}
-
-		items[i] = item
 	}
 
 	return util.PackagePageableResponse(util.PageableResponseParams{
 		Items:          items,
-		Path:           "api/v1/timelines/home",
+		Path:           "/api/v1/timelines/home",
 		NextMaxIDValue: nextMaxIDValue,
 		PrevMinIDValue: prevMinIDValue,
 		Limit:          limit,

internal/processing/timeline/list.go

@@ -142,25 +142,17 @@ func (p *Processor) ListTimelineGet(ctx context.Context, authed *oauth.Auth, lis
 
 	var (
 		items          = make([]interface{}, count)
-		nextMaxIDValue string
+		nextMaxIDValue = statuses[count-1].GetID()
-		prevMinIDValue string
+		prevMinIDValue = statuses[0].GetID()
 	)
 
-	for i, item := range statuses {
+	for i := range statuses {
-		if i == count-1 {
+		items[i] = statuses[i]
-			nextMaxIDValue = item.GetID()
-		}
-
-		if i == 0 {
-			prevMinIDValue = item.GetID()
-		}
-
-		items[i] = item
 	}
 
 	return util.PackagePageableResponse(util.PageableResponseParams{
 		Items:          items,
-		Path:           "api/v1/timelines/list/" + listID,
+		Path:           "/api/v1/timelines/list/" + listID,
 		NextMaxIDValue: nextMaxIDValue,
 		PrevMinIDValue: prevMinIDValue,
 		Limit:          limit,

internal/processing/timeline/public.go

@@ -43,25 +43,18 @@ func (p *Processor) PublicTimelineGet(ctx context.Context, authed *oauth.Auth, m
 	}
 
 	var (
-		items          = make([]interface{}, 0, count)
+		items = make([]interface{}, 0, count)
-		nextMaxIDValue string
-		prevMinIDValue string
-	)
 
-	for i, s := range statuses {
 		// Set next + prev values before filtering and API
 		// converting, so caller can still page properly.
-		if i == count-1 {
+		nextMaxIDValue = statuses[count-1].ID
-			nextMaxIDValue = s.ID
+		prevMinIDValue = statuses[0].ID
-		}
+	)
-
-		if i == 0 {
-			prevMinIDValue = s.ID
-		}
 
+	for _, s := range statuses {
 		timelineable, err := p.filter.StatusPublicTimelineable(ctx, authed.Account, s)
 		if err != nil {
-			log.Debugf(ctx, "skipping status %s because of an error checking StatusPublicTimelineable: %s", s.ID, err)
+			log.Errorf(ctx, "error checking status visibility: %v", err)
 			continue
 		}
 
@@ -71,7 +64,7 @@ func (p *Processor) PublicTimelineGet(ctx context.Context, authed *oauth.Auth, m
 
 		apiStatus, err := p.tc.StatusToAPIStatus(ctx, s, authed.Account)
 		if err != nil {
-			log.Debugf(ctx, "skipping status %s because it couldn't be converted to its api representation: %s", s.ID, err)
+			log.Errorf(ctx, "error convert to api status: %v", err)
 			continue
 		}
 
@@ -80,7 +73,7 @@ func (p *Processor) PublicTimelineGet(ctx context.Context, authed *oauth.Auth, m
 
 	return util.PackagePageableResponse(util.PageableResponseParams{
 		Items:          items,
-		Path:           "api/v1/timelines/public",
+		Path:           "/api/v1/timelines/public",
 		NextMaxIDValue: nextMaxIDValue,
 		PrevMinIDValue: prevMinIDValue,
 		Limit:          limit,