[performance] cache follow, follow request and block ID lists (#2027)

go.mod

@@ -5,7 +5,7 @@ go 1.20
 require (
 	codeberg.org/gruf/go-bytesize v1.0.2
 	codeberg.org/gruf/go-byteutil v1.1.2
-	codeberg.org/gruf/go-cache/v3 v3.4.3
+	codeberg.org/gruf/go-cache/v3 v3.4.4
 	codeberg.org/gruf/go-debug v1.3.0
 	codeberg.org/gruf/go-errors/v2 v2.2.0
 	codeberg.org/gruf/go-fastcopy v1.1.2

go.sum

@@ -48,8 +48,8 @@ codeberg.org/gruf/go-bytesize v1.0.2/go.mod h1:n/GU8HzL9f3UNp/mUKyr1qVmTlj7+xacp
 codeberg.org/gruf/go-byteutil v1.0.0/go.mod h1:cWM3tgMCroSzqoBXUXMhvxTxYJp+TbCr6ioISRY5vSU=
 codeberg.org/gruf/go-byteutil v1.1.2 h1:TQLZtTxTNca9xEfDIndmo7nBYxeS94nrv/9DS3Nk5Tw=
 codeberg.org/gruf/go-byteutil v1.1.2/go.mod h1:cWM3tgMCroSzqoBXUXMhvxTxYJp+TbCr6ioISRY5vSU=
-codeberg.org/gruf/go-cache/v3 v3.4.3 h1:GTNq01M17jUJ3B3ehrVTbElpvCqOKgz1x+VB9GEIxXA=
+codeberg.org/gruf/go-cache/v3 v3.4.4 h1:V0A3EzjhzhULOydD16pwa2DRDwF67OuuP4ORnm//7p8=
-codeberg.org/gruf/go-cache/v3 v3.4.3/go.mod h1:pTeVPEb9DshXUkd8Dg76UcsLpU6EC/tXQ2qb+JrmxEc=
+codeberg.org/gruf/go-cache/v3 v3.4.4/go.mod h1:pTeVPEb9DshXUkd8Dg76UcsLpU6EC/tXQ2qb+JrmxEc=
 codeberg.org/gruf/go-debug v1.3.0 h1:PIRxQiWUFKtGOGZFdZ3Y0pqyfI0Xr87j224IYe2snZs=
 codeberg.org/gruf/go-debug v1.3.0/go.mod h1:N+vSy9uJBQgpQcJUqjctvqFz7tBHJf+S/PIjLILzpLg=
 codeberg.org/gruf/go-errors/v2 v2.0.0/go.mod h1:ZRhbdhvgoUA3Yw6e56kd9Ox984RrvbEFC2pOXyHDJP4=

internal/api/client/blocks/blocks.go

@@ -30,8 +30,10 @@ const (
 
 	// MaxIDKey is the url query for setting a max ID to return
 	MaxIDKey = "max_id"
+
 	// SinceIDKey is the url query for returning results newer than the given ID
 	SinceIDKey = "since_id"
+
 	// LimitKey is for specifying maximum number of results to return.
 	LimitKey = "limit"
 )

internal/api/client/blocks/blocksget.go

@@ -18,14 +18,13 @@
 package blocks
 
 import (
-	"fmt"
 	"net/http"
-	"strconv"
 
 	"github.com/gin-gonic/gin"
 	apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
 	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 	"github.com/superseriousbusiness/gotosocial/internal/oauth"
+	"github.com/superseriousbusiness/gotosocial/internal/paging"
 )
 
 // BlocksGETHandler swagger:operation GET /api/v1/blocks blocksGet
@@ -104,31 +103,21 @@ func (m *Module) BlocksGETHandler(c *gin.Context) {
 		return
 	}
 
-	maxID := ""
+	limit, errWithCode := apiutil.ParseLimit(c.Query(LimitKey), 20, 100, 2)
-	maxIDString := c.Query(MaxIDKey)
+	if err != nil {
-	if maxIDString != "" {
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
-		maxID = maxIDString
+		return
 	}
 
-	sinceID := ""
+	resp, errWithCode := m.processor.BlocksGet(
-	sinceIDString := c.Query(SinceIDKey)
+		c.Request.Context(),
-	if sinceIDString != "" {
+		authed.Account,
-		sinceID = sinceIDString
+		paging.Pager{
-	}
+			SinceID: c.Query(SinceIDKey),
-
+			MaxID:   c.Query(MaxIDKey),
-	limit := 20
+			Limit:   limit,
-	limitString := c.Query(LimitKey)
+		},
-	if limitString != "" {
+	)
-		i, err := strconv.ParseInt(limitString, 10, 32)
-		if err != nil {
-			err := fmt.Errorf("error parsing %s: %s", LimitKey, err)
-			apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
-			return
-		}
-		limit = int(i)
-	}
-
-	resp, errWithCode := m.processor.BlocksGet(c.Request.Context(), authed, maxID, sinceID, limit)
 	if errWithCode != nil {
 		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
 		return
@@ -137,5 +126,6 @@ func (m *Module) BlocksGETHandler(c *gin.Context) {
 	if resp.LinkHeader != "" {
 		c.Header("Link", resp.LinkHeader)
 	}
-	c.JSON(http.StatusOK, resp.Accounts)
+
+	c.JSON(http.StatusOK, resp.Items)
 }

internal/cache/cache.go

@@ -80,6 +80,27 @@ func (c *Caches) setuphooks() {
 		// Invalidate account ID cached visibility.
 		c.Visibility.Invalidate("ItemID", account.ID)
 		c.Visibility.Invalidate("RequesterID", account.ID)
+
+		// Invalidate this account's
+		// following / follower lists.
+		// (see FollowIDs() comment for details).
+		c.GTS.FollowIDs().InvalidateAll(
+			">"+account.ID,
+			"l>"+account.ID,
+			"<"+account.ID,
+			"l<"+account.ID,
+		)
+
+		// Invalidate this account's
+		// follow requesting / request lists.
+		// (see FollowRequestIDs() comment for details).
+		c.GTS.FollowRequestIDs().InvalidateAll(
+			">"+account.ID,
+			"<"+account.ID,
+		)
+
+		// Invalidate this account's block lists.
+		c.GTS.BlockIDs().Invalidate(account.ID)
 	})
 
 	c.GTS.Block().SetInvalidateCallback(func(block *gtsmodel.Block) {
@@ -90,6 +111,9 @@ func (c *Caches) setuphooks() {
 		// Invalidate block target account ID cached visibility.
 		c.Visibility.Invalidate("ItemID", block.TargetAccountID)
 		c.Visibility.Invalidate("RequesterID", block.TargetAccountID)
+
+		// Invalidate source account's block lists.
+		c.GTS.BlockIDs().Invalidate(block.AccountID)
 	})
 
 	c.GTS.EmojiCategory().SetInvalidateCallback(func(category *gtsmodel.EmojiCategory) {
@@ -98,6 +122,9 @@ func (c *Caches) setuphooks() {
 	})
 
 	c.GTS.Follow().SetInvalidateCallback(func(follow *gtsmodel.Follow) {
+		// Invalidate follow request with this same ID.
+		c.GTS.FollowRequest().Invalidate("ID", follow.ID)
+
 		// Invalidate any related list entries.
 		c.GTS.ListEntry().Invalidate("FollowID", follow.ID)
 
@@ -108,19 +135,35 @@ func (c *Caches) setuphooks() {
 		// Invalidate follow target account ID cached visibility.
 		c.Visibility.Invalidate("ItemID", follow.TargetAccountID)
 		c.Visibility.Invalidate("RequesterID", follow.TargetAccountID)
+
+		// Invalidate source account's following
+		// lists, and destination's follwer lists.
+		// (see FollowIDs() comment for details).
+		c.GTS.FollowIDs().InvalidateAll(
+			">"+follow.AccountID,
+			"l>"+follow.AccountID,
+			"<"+follow.AccountID,
+			"l<"+follow.AccountID,
+			"<"+follow.TargetAccountID,
+			"l<"+follow.TargetAccountID,
+			">"+follow.TargetAccountID,
+			"l>"+follow.TargetAccountID,
+		)
 	})
 
 	c.GTS.FollowRequest().SetInvalidateCallback(func(followReq *gtsmodel.FollowRequest) {
-		// Invalidate follow request origin account ID cached visibility.
+		// Invalidate follow with this same ID.
-		c.Visibility.Invalidate("ItemID", followReq.AccountID)
-		c.Visibility.Invalidate("RequesterID", followReq.AccountID)
-
-		// Invalidate follow request target account ID cached visibility.
-		c.Visibility.Invalidate("ItemID", followReq.TargetAccountID)
-		c.Visibility.Invalidate("RequesterID", followReq.TargetAccountID)
-
-		// Invalidate any cached follow with same ID.
 		c.GTS.Follow().Invalidate("ID", followReq.ID)
+
+		// Invalidate source account's followreq
+		// lists, and destinations follow req lists.
+		// (see FollowRequestIDs() comment for details).
+		c.GTS.FollowRequestIDs().InvalidateAll(
+			">"+followReq.AccountID,
+			"<"+followReq.AccountID,
+			">"+followReq.TargetAccountID,
+			"<"+followReq.TargetAccountID,
+		)
 	})
 
 	c.GTS.List().SetInvalidateCallback(func(list *gtsmodel.List) {
@@ -128,12 +171,29 @@ func (c *Caches) setuphooks() {
 		c.GTS.ListEntry().Invalidate("ListID", list.ID)
 	})
 
+	c.GTS.Media().SetInvalidateCallback(func(media *gtsmodel.MediaAttachment) {
+		if *media.Avatar || *media.Header {
+			// Invalidate cache of attaching account.
+			c.GTS.Account().Invalidate("ID", media.AccountID)
+		}
+
+		if media.StatusID != "" {
+			// Invalidate cache of attaching status.
+			c.GTS.Status().Invalidate("ID", media.StatusID)
+		}
+	})
+
 	c.GTS.Status().SetInvalidateCallback(func(status *gtsmodel.Status) {
 		// Invalidate status ID cached visibility.
 		c.Visibility.Invalidate("ItemID", status.ID)
 
 		for _, id := range status.AttachmentIDs {
-			// Invalidate cache for attached media IDs,
+			// Invalidate each media by the IDs we're aware of.
+			// This must be done as the status table is aware of
+			// the media IDs in use before the media table is
+			// aware of the status ID they are linked to.
+			//
+			// c.GTS.Media().Invalidate("StatusID") will not work.
 			c.GTS.Media().Invalidate("ID", id)
 		}
 	})

internal/cache/gts.go

@@ -26,29 +26,31 @@ import (
 )
 
 type GTSCaches struct {
-	account     *result.Cache[*gtsmodel.Account]
+	account          *result.Cache[*gtsmodel.Account]
-	accountNote *result.Cache[*gtsmodel.AccountNote]
+	accountNote      *result.Cache[*gtsmodel.AccountNote]
-	block       *result.Cache[*gtsmodel.Block]
+	block            *result.Cache[*gtsmodel.Block]
-	// TODO: maybe should be moved out of here since it's
+	blockIDs         *SliceCache[string]
-	// not actually doing anything with gtsmodel.DomainBlock.
+	domainBlock      *domain.BlockCache
-	domainBlock   *domain.BlockCache
+	emoji            *result.Cache[*gtsmodel.Emoji]
-	emoji         *result.Cache[*gtsmodel.Emoji]
+	emojiCategory    *result.Cache[*gtsmodel.EmojiCategory]
-	emojiCategory *result.Cache[*gtsmodel.EmojiCategory]
+	follow           *result.Cache[*gtsmodel.Follow]
-	follow        *result.Cache[*gtsmodel.Follow]
+	followIDs        *SliceCache[string]
-	followRequest *result.Cache[*gtsmodel.FollowRequest]
+	followRequest    *result.Cache[*gtsmodel.FollowRequest]
-	instance      *result.Cache[*gtsmodel.Instance]
+	followRequestIDs *SliceCache[string]
-	list          *result.Cache[*gtsmodel.List]
+	instance         *result.Cache[*gtsmodel.Instance]
-	listEntry     *result.Cache[*gtsmodel.ListEntry]
+	list             *result.Cache[*gtsmodel.List]
-	marker        *result.Cache[*gtsmodel.Marker]
+	listEntry        *result.Cache[*gtsmodel.ListEntry]
-	media         *result.Cache[*gtsmodel.MediaAttachment]
+	marker           *result.Cache[*gtsmodel.Marker]
-	mention       *result.Cache[*gtsmodel.Mention]
+	media            *result.Cache[*gtsmodel.MediaAttachment]
-	notification  *result.Cache[*gtsmodel.Notification]
+	mention          *result.Cache[*gtsmodel.Mention]
-	report        *result.Cache[*gtsmodel.Report]
+	notification     *result.Cache[*gtsmodel.Notification]
-	status        *result.Cache[*gtsmodel.Status]
+	report           *result.Cache[*gtsmodel.Report]
-	statusFave    *result.Cache[*gtsmodel.StatusFave]
+	status           *result.Cache[*gtsmodel.Status]
-	tombstone     *result.Cache[*gtsmodel.Tombstone]
+	statusFave       *result.Cache[*gtsmodel.StatusFave]
-	user          *result.Cache[*gtsmodel.User]
+	tombstone        *result.Cache[*gtsmodel.Tombstone]
-	// TODO: move out of GTS caches since not using database models.
+	user             *result.Cache[*gtsmodel.User]
+
+	// TODO: move out of GTS caches since unrelated to DB.
 	webfinger *ttl.Cache[string, string]
 }
 
@@ -58,11 +60,14 @@ func (c *GTSCaches) Init() {
 	c.initAccount()
 	c.initAccountNote()
 	c.initBlock()
+	c.initBlockIDs()
 	c.initDomainBlock()
 	c.initEmoji()
 	c.initEmojiCategory()
 	c.initFollow()
+	c.initFollowIDs()
 	c.initFollowRequest()
+	c.initFollowRequestIDs()
 	c.initInstance()
 	c.initList()
 	c.initListEntry()
@@ -83,10 +88,28 @@ func (c *GTSCaches) Start() {
 	tryStart(c.account, config.GetCacheGTSAccountSweepFreq())
 	tryStart(c.accountNote, config.GetCacheGTSAccountNoteSweepFreq())
 	tryStart(c.block, config.GetCacheGTSBlockSweepFreq())
+	tryUntil("starting block IDs cache", 5, func() bool {
+		if sweep := config.GetCacheGTSBlockIDsSweepFreq(); sweep > 0 {
+			return c.blockIDs.Start(sweep)
+		}
+		return true
+	})
 	tryStart(c.emoji, config.GetCacheGTSEmojiSweepFreq())
 	tryStart(c.emojiCategory, config.GetCacheGTSEmojiCategorySweepFreq())
 	tryStart(c.follow, config.GetCacheGTSFollowSweepFreq())
+	tryUntil("starting follow IDs cache", 5, func() bool {
+		if sweep := config.GetCacheGTSFollowIDsSweepFreq(); sweep > 0 {
+			return c.followIDs.Start(sweep)
+		}
+		return true
+	})
 	tryStart(c.followRequest, config.GetCacheGTSFollowRequestSweepFreq())
+	tryUntil("starting follow request IDs cache", 5, func() bool {
+		if sweep := config.GetCacheGTSFollowRequestIDsSweepFreq(); sweep > 0 {
+			return c.followRequestIDs.Start(sweep)
+		}
+		return true
+	})
 	tryStart(c.instance, config.GetCacheGTSInstanceSweepFreq())
 	tryStart(c.list, config.GetCacheGTSListSweepFreq())
 	tryStart(c.listEntry, config.GetCacheGTSListEntrySweepFreq())
@@ -112,10 +135,28 @@ func (c *GTSCaches) Stop() {
 	tryStop(c.account, config.GetCacheGTSAccountSweepFreq())
 	tryStop(c.accountNote, config.GetCacheGTSAccountNoteSweepFreq())
 	tryStop(c.block, config.GetCacheGTSBlockSweepFreq())
+	tryUntil("stopping block IDs cache", 5, func() bool {
+		if config.GetCacheGTSBlockIDsSweepFreq() > 0 {
+			return c.blockIDs.Stop()
+		}
+		return true
+	})
 	tryStop(c.emoji, config.GetCacheGTSEmojiSweepFreq())
 	tryStop(c.emojiCategory, config.GetCacheGTSEmojiCategorySweepFreq())
 	tryStop(c.follow, config.GetCacheGTSFollowSweepFreq())
+	tryUntil("stopping follow IDs cache", 5, func() bool {
+		if config.GetCacheGTSFollowIDsSweepFreq() > 0 {
+			return c.followIDs.Stop()
+		}
+		return true
+	})
 	tryStop(c.followRequest, config.GetCacheGTSFollowRequestSweepFreq())
+	tryUntil("stopping follow request IDs cache", 5, func() bool {
+		if config.GetCacheGTSFollowRequestIDsSweepFreq() > 0 {
+			return c.followRequestIDs.Stop()
+		}
+		return true
+	})
 	tryStop(c.instance, config.GetCacheGTSInstanceSweepFreq())
 	tryStop(c.list, config.GetCacheGTSListSweepFreq())
 	tryStop(c.listEntry, config.GetCacheGTSListEntrySweepFreq())
@@ -128,7 +169,12 @@ func (c *GTSCaches) Stop() {
 	tryStop(c.statusFave, config.GetCacheGTSStatusFaveSweepFreq())
 	tryStop(c.tombstone, config.GetCacheGTSTombstoneSweepFreq())
 	tryStop(c.user, config.GetCacheGTSUserSweepFreq())
-	tryUntil("stopping *gtsmodel.Webfinger cache", 5, c.webfinger.Stop)
+	tryUntil("stopping *gtsmodel.Webfinger cache", 5, func() bool {
+		if config.GetCacheGTSWebfingerSweepFreq() > 0 {
+			return c.webfinger.Stop()
+		}
+		return true
+	})
 }
 
 // Account provides access to the gtsmodel Account database cache.
@@ -146,6 +192,11 @@ func (c *GTSCaches) Block() *result.Cache[*gtsmodel.Block] {
 	return c.block
 }
 
+// FollowIDs provides access to the block IDs database cache.
+func (c *GTSCaches) BlockIDs() *SliceCache[string] {
+	return c.blockIDs
+}
+
 // DomainBlock provides access to the domain block database cache.
 func (c *GTSCaches) DomainBlock() *domain.BlockCache {
 	return c.domainBlock
@@ -166,11 +217,29 @@ func (c *GTSCaches) Follow() *result.Cache[*gtsmodel.Follow] {
 	return c.follow
 }
 
+// FollowIDs provides access to the follower / following IDs database cache.
+// THIS CACHE IS KEYED AS THE FOLLOWING {prefix}{accountID} WHERE PREFIX IS:
+// - '>'  for following IDs
+// - 'l>' for local following IDs
+// - '<'  for follower IDs
+// - 'l<' for local follower IDs
+func (c *GTSCaches) FollowIDs() *SliceCache[string] {
+	return c.followIDs
+}
+
 // FollowRequest provides access to the gtsmodel FollowRequest database cache.
 func (c *GTSCaches) FollowRequest() *result.Cache[*gtsmodel.FollowRequest] {
 	return c.followRequest
 }
 
+// FollowRequestIDs provides access to the follow requester / requesting IDs database
+// cache. THIS CACHE IS KEYED AS THE FOLLOWING {prefix}{accountID} WHERE PREFIX IS:
+// - '>'  for following IDs
+// - '<'  for follower IDs
+func (c *GTSCaches) FollowRequestIDs() *SliceCache[string] {
+	return c.followRequestIDs
+}
+
 // Instance provides access to the gtsmodel Instance database cache.
 func (c *GTSCaches) Instance() *result.Cache[*gtsmodel.Instance] {
 	return c.instance
@@ -274,6 +343,8 @@ func (c *GTSCaches) initBlock() {
 		{Name: "ID"},
 		{Name: "URI"},
 		{Name: "AccountID.TargetAccountID"},
+		{Name: "AccountID", Multi: true},
+		{Name: "TargetAccountID", Multi: true},
 	}, func(b1 *gtsmodel.Block) *gtsmodel.Block {
 		b2 := new(gtsmodel.Block)
 		*b2 = *b1
@@ -283,6 +354,14 @@ func (c *GTSCaches) initBlock() {
 	c.block.IgnoreErrors(ignoreErrors)
 }
 
+func (c *GTSCaches) initBlockIDs() {
+	c.blockIDs = &SliceCache[string]{Cache: ttl.New[string, []string](
+		0,
+		config.GetCacheGTSBlockIDsMaxSize(),
+		config.GetCacheGTSBlockIDsTTL(),
+	)}
+}
+
 func (c *GTSCaches) initDomainBlock() {
 	c.domainBlock = new(domain.BlockCache)
 }
@@ -321,6 +400,8 @@ func (c *GTSCaches) initFollow() {
 		{Name: "ID"},
 		{Name: "URI"},
 		{Name: "AccountID.TargetAccountID"},
+		{Name: "AccountID", Multi: true},
+		{Name: "TargetAccountID", Multi: true},
 	}, func(f1 *gtsmodel.Follow) *gtsmodel.Follow {
 		f2 := new(gtsmodel.Follow)
 		*f2 = *f1
@@ -329,11 +410,21 @@ func (c *GTSCaches) initFollow() {
 	c.follow.SetTTL(config.GetCacheGTSFollowTTL(), true)
 }
 
+func (c *GTSCaches) initFollowIDs() {
+	c.followIDs = &SliceCache[string]{Cache: ttl.New[string, []string](
+		0,
+		config.GetCacheGTSFollowIDsMaxSize(),
+		config.GetCacheGTSFollowIDsTTL(),
+	)}
+}
+
 func (c *GTSCaches) initFollowRequest() {
 	c.followRequest = result.New([]result.Lookup{
 		{Name: "ID"},
 		{Name: "URI"},
 		{Name: "AccountID.TargetAccountID"},
+		{Name: "AccountID", Multi: true},
+		{Name: "TargetAccountID", Multi: true},
 	}, func(f1 *gtsmodel.FollowRequest) *gtsmodel.FollowRequest {
 		f2 := new(gtsmodel.FollowRequest)
 		*f2 = *f1
@@ -342,6 +433,14 @@ func (c *GTSCaches) initFollowRequest() {
 	c.followRequest.SetTTL(config.GetCacheGTSFollowRequestTTL(), true)
 }
 
+func (c *GTSCaches) initFollowRequestIDs() {
+	c.followRequestIDs = &SliceCache[string]{Cache: ttl.New[string, []string](
+		0,
+		config.GetCacheGTSFollowRequestIDsMaxSize(),
+		config.GetCacheGTSFollowRequestIDsTTL(),
+	)}
+}
+
 func (c *GTSCaches) initInstance() {
 	c.instance = result.New([]result.Lookup{
 		{Name: "ID"},
@@ -502,5 +601,6 @@ func (c *GTSCaches) initWebfinger() {
 	c.webfinger = ttl.New[string, string](
 		0,
 		config.GetCacheGTSWebfingerMaxSize(),
-		config.GetCacheGTSWebfingerTTL())
+		config.GetCacheGTSWebfingerTTL(),
+	)
 }

internal/cache/slice.go

@@ -0,0 +1,76 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package cache
+
+import (
+	"codeberg.org/gruf/go-cache/v3/ttl"
+	"golang.org/x/exp/slices"
+)
+
+// SliceCache wraps a ttl.Cache to provide simple loader-callback
+// functions for fetching + caching slices of objects (e.g. IDs).
+type SliceCache[T any] struct {
+	*ttl.Cache[string, []T]
+}
+
+// Load will attempt to load an existing slice from the cache for the given key, else calling the provided load function and caching the result.
+func (c *SliceCache[T]) Load(key string, load func() ([]T, error)) ([]T, error) {
+	// Look for follow IDs list in cache under this key.
+	data, ok := c.Get(key)
+
+	if !ok {
+		var err error
+
+		// Not cached, load!
+		data, err = load()
+		if err != nil {
+			return nil, err
+		}
+
+		// Store the data.
+		c.Set(key, data)
+	}
+
+	// Return data clone for safety.
+	return slices.Clone(data), nil
+}
+
+// LoadRange is functionally the same as .Load(), but will pass the result through provided reslice function before returning a cloned result.
+func (c *SliceCache[T]) LoadRange(key string, load func() ([]T, error), reslice func([]T) []T) ([]T, error) {
+	// Look for follow IDs list in cache under this key.
+	data, ok := c.Get(key)
+
+	if !ok {
+		var err error
+
+		// Not cached, load!
+		data, err = load()
+		if err != nil {
+			return nil, err
+		}
+
+		// Store the data.
+		c.Set(key, data)
+	}
+
+	// Reslice to range.
+	slice := reslice(data)
+
+	// Return range clone for safety.
+	return slices.Clone(slice), nil
+}

internal/cache/util.go

@@ -18,28 +18,33 @@
 package cache
 
 import (
-	"context"
+	"database/sql"
 	"errors"
 	"fmt"
 	"time"
 
 	"codeberg.org/gruf/go-cache/v3/result"
 	errorsv2 "codeberg.org/gruf/go-errors/v2"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/log"
 )
 
-// SentinelError is returned to indicate a non-permanent error return,
+// SentinelError is an error that can be returned and checked against to indicate a non-permanent
-// i.e. a situation in which we do not want a cache a negative result.
+// error return from a cache loader callback, e.g. a temporary situation that will soon be fixed.
 var SentinelError = errors.New("BUG: error should not be returned") //nolint:revive
 
-// ignoreErrors is an error ignoring function capable of being passed to
+// ignoreErrors is an error matching function used to signal which errors
-// caches, which specifically catches and ignores our sentinel error type.
+// the result caches should NOT hold onto. these amount to anything non-permanent.
 func ignoreErrors(err error) bool {
-	return errorsv2.Comparable(
+	return !errorsv2.Comparable(
 		err,
-		SentinelError,
+
-		context.DeadlineExceeded,
+		// the only cacheable errs,
-		context.Canceled,
+		// i.e anything permanent
+		// (until invalidation).
+		db.ErrNoEntries,
+		db.ErrAlreadyExists,
+		sql.ErrNoRows,
 	)
 }
 

internal/config/config.go

@@ -194,6 +194,10 @@ type GTSCacheConfiguration struct {
 	BlockTTL       time.Duration `name:"block-ttl"`
 	BlockSweepFreq time.Duration `name:"block-sweep-freq"`
 
+	BlockIDsMaxSize   int           `name:"block-ids-max-size"`
+	BlockIDsTTL       time.Duration `name:"block-ids-ttl"`
+	BlockIDsSweepFreq time.Duration `name:"block-ids-sweep-freq"`
+
 	DomainBlockMaxSize   int           `name:"domain-block-max-size"`
 	DomainBlockTTL       time.Duration `name:"domain-block-ttl"`
 	DomainBlockSweepFreq time.Duration `name:"domain-block-sweep-freq"`
@@ -210,10 +214,18 @@ type GTSCacheConfiguration struct {
 	FollowTTL       time.Duration `name:"follow-ttl"`
 	FollowSweepFreq time.Duration `name:"follow-sweep-freq"`
 
+	FollowIDsMaxSize   int           `name:"follow-ids-max-size"`
+	FollowIDsTTL       time.Duration `name:"follow-ids-ttl"`
+	FollowIDsSweepFreq time.Duration `name:"follow-ids-sweep-freq"`
+
 	FollowRequestMaxSize   int           `name:"follow-request-max-size"`
 	FollowRequestTTL       time.Duration `name:"follow-request-ttl"`
 	FollowRequestSweepFreq time.Duration `name:"follow-request-sweep-freq"`
 
+	FollowRequestIDsMaxSize   int           `name:"follow-request-ids-max-size"`
+	FollowRequestIDsTTL       time.Duration `name:"follow-request-ids-ttl"`
+	FollowRequestIDsSweepFreq time.Duration `name:"follow-request-ids-sweep-freq"`
+
 	InstanceMaxSize   int           `name:"instance-max-size"`
 	InstanceTTL       time.Duration `name:"instance-ttl"`
 	InstanceSweepFreq time.Duration `name:"instance-sweep-freq"`

internal/config/defaults.go

@@ -139,6 +139,10 @@ var Defaults = Configuration{
 			BlockTTL:       time.Minute * 30,
 			BlockSweepFreq: time.Minute,
 
+			BlockIDsMaxSize:   500,
+			BlockIDsTTL:       time.Minute * 30,
+			BlockIDsSweepFreq: time.Minute,
+
 			DomainBlockMaxSize:   2000,
 			DomainBlockTTL:       time.Hour * 24,
 			DomainBlockSweepFreq: time.Minute,
@@ -155,10 +159,18 @@ var Defaults = Configuration{
 			FollowTTL:       time.Minute * 30,
 			FollowSweepFreq: time.Minute,
 
+			FollowIDsMaxSize:   500,
+			FollowIDsTTL:       time.Minute * 30,
+			FollowIDsSweepFreq: time.Minute,
+
 			FollowRequestMaxSize:   2000,
 			FollowRequestTTL:       time.Minute * 30,
 			FollowRequestSweepFreq: time.Minute,
 
+			FollowRequestIDsMaxSize:   500,
+			FollowRequestIDsTTL:       time.Minute * 30,
+			FollowRequestIDsSweepFreq: time.Minute,
+
 			InstanceMaxSize:   2000,
 			InstanceTTL:       time.Minute * 30,
 			InstanceSweepFreq: time.Minute,

internal/config/helpers.gen.go

@@ -2624,6 +2624,81 @@ func GetCacheGTSBlockSweepFreq() time.Duration { return global.GetCacheGTSBlockS
 // SetCacheGTSBlockSweepFreq safely sets the value for global configuration 'Cache.GTS.BlockSweepFreq' field
 func SetCacheGTSBlockSweepFreq(v time.Duration) { global.SetCacheGTSBlockSweepFreq(v) }
 
+// GetCacheGTSBlockIDsMaxSize safely fetches the Configuration value for state's 'Cache.GTS.BlockIDsMaxSize' field
+func (st *ConfigState) GetCacheGTSBlockIDsMaxSize() (v int) {
+	st.mutex.RLock()
+	v = st.config.Cache.GTS.BlockIDsMaxSize
+	st.mutex.RUnlock()
+	return
+}
+
+// SetCacheGTSBlockIDsMaxSize safely sets the Configuration value for state's 'Cache.GTS.BlockIDsMaxSize' field
+func (st *ConfigState) SetCacheGTSBlockIDsMaxSize(v int) {
+	st.mutex.Lock()
+	defer st.mutex.Unlock()
+	st.config.Cache.GTS.BlockIDsMaxSize = v
+	st.reloadToViper()
+}
+
+// CacheGTSBlockIDsMaxSizeFlag returns the flag name for the 'Cache.GTS.BlockIDsMaxSize' field
+func CacheGTSBlockIDsMaxSizeFlag() string { return "cache-gts-block-ids-max-size" }
+
+// GetCacheGTSBlockIDsMaxSize safely fetches the value for global configuration 'Cache.GTS.BlockIDsMaxSize' field
+func GetCacheGTSBlockIDsMaxSize() int { return global.GetCacheGTSBlockIDsMaxSize() }
+
+// SetCacheGTSBlockIDsMaxSize safely sets the value for global configuration 'Cache.GTS.BlockIDsMaxSize' field
+func SetCacheGTSBlockIDsMaxSize(v int) { global.SetCacheGTSBlockIDsMaxSize(v) }
+
+// GetCacheGTSBlockIDsTTL safely fetches the Configuration value for state's 'Cache.GTS.BlockIDsTTL' field
+func (st *ConfigState) GetCacheGTSBlockIDsTTL() (v time.Duration) {
+	st.mutex.RLock()
+	v = st.config.Cache.GTS.BlockIDsTTL
+	st.mutex.RUnlock()
+	return
+}
+
+// SetCacheGTSBlockIDsTTL safely sets the Configuration value for state's 'Cache.GTS.BlockIDsTTL' field
+func (st *ConfigState) SetCacheGTSBlockIDsTTL(v time.Duration) {
+	st.mutex.Lock()
+	defer st.mutex.Unlock()
+	st.config.Cache.GTS.BlockIDsTTL = v
+	st.reloadToViper()
+}
+
+// CacheGTSBlockIDsTTLFlag returns the flag name for the 'Cache.GTS.BlockIDsTTL' field
+func CacheGTSBlockIDsTTLFlag() string { return "cache-gts-block-ids-ttl" }
+
+// GetCacheGTSBlockIDsTTL safely fetches the value for global configuration 'Cache.GTS.BlockIDsTTL' field
+func GetCacheGTSBlockIDsTTL() time.Duration { return global.GetCacheGTSBlockIDsTTL() }
+
+// SetCacheGTSBlockIDsTTL safely sets the value for global configuration 'Cache.GTS.BlockIDsTTL' field
+func SetCacheGTSBlockIDsTTL(v time.Duration) { global.SetCacheGTSBlockIDsTTL(v) }
+
+// GetCacheGTSBlockIDsSweepFreq safely fetches the Configuration value for state's 'Cache.GTS.BlockIDsSweepFreq' field
+func (st *ConfigState) GetCacheGTSBlockIDsSweepFreq() (v time.Duration) {
+	st.mutex.RLock()
+	v = st.config.Cache.GTS.BlockIDsSweepFreq
+	st.mutex.RUnlock()
+	return
+}
+
+// SetCacheGTSBlockIDsSweepFreq safely sets the Configuration value for state's 'Cache.GTS.BlockIDsSweepFreq' field
+func (st *ConfigState) SetCacheGTSBlockIDsSweepFreq(v time.Duration) {
+	st.mutex.Lock()
+	defer st.mutex.Unlock()
+	st.config.Cache.GTS.BlockIDsSweepFreq = v
+	st.reloadToViper()
+}
+
+// CacheGTSBlockIDsSweepFreqFlag returns the flag name for the 'Cache.GTS.BlockIDsSweepFreq' field
+func CacheGTSBlockIDsSweepFreqFlag() string { return "cache-gts-block-ids-sweep-freq" }
+
+// GetCacheGTSBlockIDsSweepFreq safely fetches the value for global configuration 'Cache.GTS.BlockIDsSweepFreq' field
+func GetCacheGTSBlockIDsSweepFreq() time.Duration { return global.GetCacheGTSBlockIDsSweepFreq() }
+
+// SetCacheGTSBlockIDsSweepFreq safely sets the value for global configuration 'Cache.GTS.BlockIDsSweepFreq' field
+func SetCacheGTSBlockIDsSweepFreq(v time.Duration) { global.SetCacheGTSBlockIDsSweepFreq(v) }
+
 // GetCacheGTSDomainBlockMaxSize safely fetches the Configuration value for state's 'Cache.GTS.DomainBlockMaxSize' field
 func (st *ConfigState) GetCacheGTSDomainBlockMaxSize() (v int) {
 	st.mutex.RLock()
@@ -2926,6 +3001,81 @@ func GetCacheGTSFollowSweepFreq() time.Duration { return global.GetCacheGTSFollo
 // SetCacheGTSFollowSweepFreq safely sets the value for global configuration 'Cache.GTS.FollowSweepFreq' field
 func SetCacheGTSFollowSweepFreq(v time.Duration) { global.SetCacheGTSFollowSweepFreq(v) }
 
+// GetCacheGTSFollowIDsMaxSize safely fetches the Configuration value for state's 'Cache.GTS.FollowIDsMaxSize' field
+func (st *ConfigState) GetCacheGTSFollowIDsMaxSize() (v int) {
+	st.mutex.RLock()
+	v = st.config.Cache.GTS.FollowIDsMaxSize
+	st.mutex.RUnlock()
+	return
+}
+
+// SetCacheGTSFollowIDsMaxSize safely sets the Configuration value for state's 'Cache.GTS.FollowIDsMaxSize' field
+func (st *ConfigState) SetCacheGTSFollowIDsMaxSize(v int) {
+	st.mutex.Lock()
+	defer st.mutex.Unlock()
+	st.config.Cache.GTS.FollowIDsMaxSize = v
+	st.reloadToViper()
+}
+
+// CacheGTSFollowIDsMaxSizeFlag returns the flag name for the 'Cache.GTS.FollowIDsMaxSize' field
+func CacheGTSFollowIDsMaxSizeFlag() string { return "cache-gts-follow-ids-max-size" }
+
+// GetCacheGTSFollowIDsMaxSize safely fetches the value for global configuration 'Cache.GTS.FollowIDsMaxSize' field
+func GetCacheGTSFollowIDsMaxSize() int { return global.GetCacheGTSFollowIDsMaxSize() }
+
+// SetCacheGTSFollowIDsMaxSize safely sets the value for global configuration 'Cache.GTS.FollowIDsMaxSize' field
+func SetCacheGTSFollowIDsMaxSize(v int) { global.SetCacheGTSFollowIDsMaxSize(v) }
+
+// GetCacheGTSFollowIDsTTL safely fetches the Configuration value for state's 'Cache.GTS.FollowIDsTTL' field
+func (st *ConfigState) GetCacheGTSFollowIDsTTL() (v time.Duration) {
+	st.mutex.RLock()
+	v = st.config.Cache.GTS.FollowIDsTTL
+	st.mutex.RUnlock()
+	return
+}
+
+// SetCacheGTSFollowIDsTTL safely sets the Configuration value for state's 'Cache.GTS.FollowIDsTTL' field
+func (st *ConfigState) SetCacheGTSFollowIDsTTL(v time.Duration) {
+	st.mutex.Lock()
+	defer st.mutex.Unlock()
+	st.config.Cache.GTS.FollowIDsTTL = v
+	st.reloadToViper()
+}
+
+// CacheGTSFollowIDsTTLFlag returns the flag name for the 'Cache.GTS.FollowIDsTTL' field
+func CacheGTSFollowIDsTTLFlag() string { return "cache-gts-follow-ids-ttl" }
+
+// GetCacheGTSFollowIDsTTL safely fetches the value for global configuration 'Cache.GTS.FollowIDsTTL' field
+func GetCacheGTSFollowIDsTTL() time.Duration { return global.GetCacheGTSFollowIDsTTL() }
+
+// SetCacheGTSFollowIDsTTL safely sets the value for global configuration 'Cache.GTS.FollowIDsTTL' field
+func SetCacheGTSFollowIDsTTL(v time.Duration) { global.SetCacheGTSFollowIDsTTL(v) }
+
+// GetCacheGTSFollowIDsSweepFreq safely fetches the Configuration value for state's 'Cache.GTS.FollowIDsSweepFreq' field
+func (st *ConfigState) GetCacheGTSFollowIDsSweepFreq() (v time.Duration) {
+	st.mutex.RLock()
+	v = st.config.Cache.GTS.FollowIDsSweepFreq
+	st.mutex.RUnlock()
+	return
+}
+
+// SetCacheGTSFollowIDsSweepFreq safely sets the Configuration value for state's 'Cache.GTS.FollowIDsSweepFreq' field
+func (st *ConfigState) SetCacheGTSFollowIDsSweepFreq(v time.Duration) {
+	st.mutex.Lock()
+	defer st.mutex.Unlock()
+	st.config.Cache.GTS.FollowIDsSweepFreq = v
+	st.reloadToViper()
+}
+
+// CacheGTSFollowIDsSweepFreqFlag returns the flag name for the 'Cache.GTS.FollowIDsSweepFreq' field
+func CacheGTSFollowIDsSweepFreqFlag() string { return "cache-gts-follow-ids-sweep-freq" }
+
+// GetCacheGTSFollowIDsSweepFreq safely fetches the value for global configuration 'Cache.GTS.FollowIDsSweepFreq' field
+func GetCacheGTSFollowIDsSweepFreq() time.Duration { return global.GetCacheGTSFollowIDsSweepFreq() }
+
+// SetCacheGTSFollowIDsSweepFreq safely sets the value for global configuration 'Cache.GTS.FollowIDsSweepFreq' field
+func SetCacheGTSFollowIDsSweepFreq(v time.Duration) { global.SetCacheGTSFollowIDsSweepFreq(v) }
+
 // GetCacheGTSFollowRequestMaxSize safely fetches the Configuration value for state's 'Cache.GTS.FollowRequestMaxSize' field
 func (st *ConfigState) GetCacheGTSFollowRequestMaxSize() (v int) {
 	st.mutex.RLock()
@@ -3003,6 +3153,85 @@ func GetCacheGTSFollowRequestSweepFreq() time.Duration {
 // SetCacheGTSFollowRequestSweepFreq safely sets the value for global configuration 'Cache.GTS.FollowRequestSweepFreq' field
 func SetCacheGTSFollowRequestSweepFreq(v time.Duration) { global.SetCacheGTSFollowRequestSweepFreq(v) }
 
+// GetCacheGTSFollowRequestIDsMaxSize safely fetches the Configuration value for state's 'Cache.GTS.FollowRequestIDsMaxSize' field
+func (st *ConfigState) GetCacheGTSFollowRequestIDsMaxSize() (v int) {
+	st.mutex.RLock()
+	v = st.config.Cache.GTS.FollowRequestIDsMaxSize
+	st.mutex.RUnlock()
+	return
+}
+
+// SetCacheGTSFollowRequestIDsMaxSize safely sets the Configuration value for state's 'Cache.GTS.FollowRequestIDsMaxSize' field
+func (st *ConfigState) SetCacheGTSFollowRequestIDsMaxSize(v int) {
+	st.mutex.Lock()
+	defer st.mutex.Unlock()
+	st.config.Cache.GTS.FollowRequestIDsMaxSize = v
+	st.reloadToViper()
+}
+
+// CacheGTSFollowRequestIDsMaxSizeFlag returns the flag name for the 'Cache.GTS.FollowRequestIDsMaxSize' field
+func CacheGTSFollowRequestIDsMaxSizeFlag() string { return "cache-gts-follow-request-ids-max-size" }
+
+// GetCacheGTSFollowRequestIDsMaxSize safely fetches the value for global configuration 'Cache.GTS.FollowRequestIDsMaxSize' field
+func GetCacheGTSFollowRequestIDsMaxSize() int { return global.GetCacheGTSFollowRequestIDsMaxSize() }
+
+// SetCacheGTSFollowRequestIDsMaxSize safely sets the value for global configuration 'Cache.GTS.FollowRequestIDsMaxSize' field
+func SetCacheGTSFollowRequestIDsMaxSize(v int) { global.SetCacheGTSFollowRequestIDsMaxSize(v) }
+
+// GetCacheGTSFollowRequestIDsTTL safely fetches the Configuration value for state's 'Cache.GTS.FollowRequestIDsTTL' field
+func (st *ConfigState) GetCacheGTSFollowRequestIDsTTL() (v time.Duration) {
+	st.mutex.RLock()
+	v = st.config.Cache.GTS.FollowRequestIDsTTL
+	st.mutex.RUnlock()
+	return
+}
+
+// SetCacheGTSFollowRequestIDsTTL safely sets the Configuration value for state's 'Cache.GTS.FollowRequestIDsTTL' field
+func (st *ConfigState) SetCacheGTSFollowRequestIDsTTL(v time.Duration) {
+	st.mutex.Lock()
+	defer st.mutex.Unlock()
+	st.config.Cache.GTS.FollowRequestIDsTTL = v
+	st.reloadToViper()
+}
+
+// CacheGTSFollowRequestIDsTTLFlag returns the flag name for the 'Cache.GTS.FollowRequestIDsTTL' field
+func CacheGTSFollowRequestIDsTTLFlag() string { return "cache-gts-follow-request-ids-ttl" }
+
+// GetCacheGTSFollowRequestIDsTTL safely fetches the value for global configuration 'Cache.GTS.FollowRequestIDsTTL' field
+func GetCacheGTSFollowRequestIDsTTL() time.Duration { return global.GetCacheGTSFollowRequestIDsTTL() }
+
+// SetCacheGTSFollowRequestIDsTTL safely sets the value for global configuration 'Cache.GTS.FollowRequestIDsTTL' field
+func SetCacheGTSFollowRequestIDsTTL(v time.Duration) { global.SetCacheGTSFollowRequestIDsTTL(v) }
+
+// GetCacheGTSFollowRequestIDsSweepFreq safely fetches the Configuration value for state's 'Cache.GTS.FollowRequestIDsSweepFreq' field
+func (st *ConfigState) GetCacheGTSFollowRequestIDsSweepFreq() (v time.Duration) {
+	st.mutex.RLock()
+	v = st.config.Cache.GTS.FollowRequestIDsSweepFreq
+	st.mutex.RUnlock()
+	return
+}
+
+// SetCacheGTSFollowRequestIDsSweepFreq safely sets the Configuration value for state's 'Cache.GTS.FollowRequestIDsSweepFreq' field
+func (st *ConfigState) SetCacheGTSFollowRequestIDsSweepFreq(v time.Duration) {
+	st.mutex.Lock()
+	defer st.mutex.Unlock()
+	st.config.Cache.GTS.FollowRequestIDsSweepFreq = v
+	st.reloadToViper()
+}
+
+// CacheGTSFollowRequestIDsSweepFreqFlag returns the flag name for the 'Cache.GTS.FollowRequestIDsSweepFreq' field
+func CacheGTSFollowRequestIDsSweepFreqFlag() string { return "cache-gts-follow-request-ids-sweep-freq" }
+
+// GetCacheGTSFollowRequestIDsSweepFreq safely fetches the value for global configuration 'Cache.GTS.FollowRequestIDsSweepFreq' field
+func GetCacheGTSFollowRequestIDsSweepFreq() time.Duration {
+	return global.GetCacheGTSFollowRequestIDsSweepFreq()
+}
+
+// SetCacheGTSFollowRequestIDsSweepFreq safely sets the value for global configuration 'Cache.GTS.FollowRequestIDsSweepFreq' field
+func SetCacheGTSFollowRequestIDsSweepFreq(v time.Duration) {
+	global.SetCacheGTSFollowRequestIDsSweepFreq(v)
+}
+
 // GetCacheGTSInstanceMaxSize safely fetches the Configuration value for state's 'Cache.GTS.InstanceMaxSize' field
 func (st *ConfigState) GetCacheGTSInstanceMaxSize() (v int) {
 	st.mutex.RLock()

internal/db/account.go

@@ -104,8 +104,6 @@ type Account interface {
 	// In the case of no statuses, this function will return db.ErrNoEntries.
 	GetAccountWebStatuses(ctx context.Context, accountID string, limit int, maxID string) ([]*gtsmodel.Status, error)
 
-	GetAccountBlocks(ctx context.Context, accountID string, maxID string, sinceID string, limit int) ([]*gtsmodel.Account, string, string, error)
-
 	// GetAccountLastPosted simply gets the timestamp of the most recent post by the account.
 	//
 	// If webOnly is true, then the time of the last non-reply, non-boost, public status of the account will be returned.

internal/db/bundb/account.go

@@ -694,46 +694,6 @@ func (a *accountDB) GetAccountWebStatuses(ctx context.Context, accountID string,
 	return a.statusesFromIDs(ctx, statusIDs)
 }
 
-func (a *accountDB) GetAccountBlocks(ctx context.Context, accountID string, maxID string, sinceID string, limit int) ([]*gtsmodel.Account, string, string, error) {
-	blocks := []*gtsmodel.Block{}
-
-	fq := a.db.
-		NewSelect().
-		Model(&blocks).
-		Where("? = ?", bun.Ident("block.account_id"), accountID).
-		Relation("TargetAccount").
-		Order("block.id DESC")
-
-	if maxID != "" {
-		fq = fq.Where("? < ?", bun.Ident("block.id"), maxID)
-	}
-
-	if sinceID != "" {
-		fq = fq.Where("? > ?", bun.Ident("block.id"), sinceID)
-	}
-
-	if limit > 0 {
-		fq = fq.Limit(limit)
-	}
-
-	if err := fq.Scan(ctx); err != nil {
-		return nil, "", "", a.db.ProcessError(err)
-	}
-
-	if len(blocks) == 0 {
-		return nil, "", "", db.ErrNoEntries
-	}
-
-	accounts := []*gtsmodel.Account{}
-	for _, b := range blocks {
-		accounts = append(accounts, b.TargetAccount)
-	}
-
-	nextMaxID := blocks[len(blocks)-1].ID
-	prevMinID := blocks[0].ID
-	return accounts, nextMaxID, prevMinID, nil
-}
-
 func (a *accountDB) statusesFromIDs(ctx context.Context, statusIDs []string) ([]*gtsmodel.Status, error) {
 	// Catch case of no statuses early
 	if len(statusIDs) == 0 {

internal/db/bundb/emoji.go

@@ -126,16 +126,12 @@ func (e *emojiDB) DeleteEmojiByID(ctx context.Context, id string) error {
 			return err
 		}
 
-		// Prepare SELECT accounts query.
+		// Prepare a SELECT query with a WHERE LIKE
-		aq := tx.NewSelect().
-			Table("accounts").
-			Column("id")
-
-		// Append a WHERE LIKE clause to the query
 		// that checks the `emoji` column for any
 		// text containing this specific emoji ID.
 		//
 		// (see GetStatusesUsingEmoji() for details.)
+		aq := tx.NewSelect().Table("accounts").Column("id")
 		aq = whereLike(aq, "emojis", id)
 
 		// Select all accounts using this emoji into accountIDss.
@@ -170,16 +166,12 @@ func (e *emojiDB) DeleteEmojiByID(ctx context.Context, id string) error {
 			}
 		}
 
-		// Prepare SELECT statuses query.
+		// Prepare a SELECT query with a WHERE LIKE
-		sq := tx.NewSelect().
-			Table("statuses").
-			Column("id")
-
-		// Append a WHERE LIKE clause to the query
 		// that checks the `emoji` column for any
 		// text containing this specific emoji ID.
 		//
 		// (see GetStatusesUsingEmoji() for details.)
+		sq := tx.NewSelect().Table("statuses").Column("id")
 		sq = whereLike(sq, "emojis", id)
 
 		// Select all statuses using this emoji into statusIDs.

internal/db/bundb/list.go

@@ -189,11 +189,10 @@ func (l *listDB) DeleteListByID(ctx context.Context, id string) error {
 		gtscontext.SetBarebones(ctx),
 		id,
 	)
-	if err != nil {
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
-		if errors.Is(err, db.ErrNoEntries) {
+		// NOTE: even if db.ErrNoEntries is returned, we
-			// Already gone.
+		// still run the below transaction to ensure related
-			return nil
+		// objects are appropriately deleted.
-		}
 		return err
 	}
 

internal/db/bundb/media.go

@@ -106,8 +106,6 @@ func (m *mediaDB) UpdateAttachment(ctx context.Context, media *gtsmodel.MediaAtt
 }
 
 func (m *mediaDB) DeleteAttachment(ctx context.Context, id string) error {
-	defer m.state.Caches.GTS.Media().Invalidate("ID", id)
-
 	// Load media into cache before attempting a delete,
 	// as we need it cached in order to trigger the invalidate
 	// callback. This in turn invalidates others.
@@ -120,10 +118,8 @@ func (m *mediaDB) DeleteAttachment(ctx context.Context, id string) error {
 		return err
 	}
 
-	var (
+	// On return, ensure that media with ID is invalidated.
-		invalidateAccount bool
+	defer m.state.Caches.GTS.Media().Invalidate("ID", id)
-		invalidateStatus  bool
-	)
 
 	// Delete media attachment in new transaction.
 	err = m.db.RunInTx(ctx, func(tx bun.Tx) error {
@@ -161,9 +157,6 @@ func (m *mediaDB) DeleteAttachment(ctx context.Context, id string) error {
 				if _, err := set(q).Exec(ctx); err != nil {
 					return gtserror.Newf("error updating account: %w", err)
 				}
-
-				// Mark as needing invalidate.
-				invalidateAccount = true
 			}
 		}
 
@@ -178,33 +171,18 @@ func (m *mediaDB) DeleteAttachment(ctx context.Context, id string) error {
 				return gtserror.Newf("error selecting status: %w", err)
 			}
 
-			// Get length of attachments beforehand.
+			if updatedIDs := dropID(status.AttachmentIDs, id); // nocollapse
-			before := len(status.AttachmentIDs)
+			len(updatedIDs) != len(status.AttachmentIDs) {
-
+				// Note: this handles not found.
-			for i := 0; i < len(status.AttachmentIDs); {
-				if status.AttachmentIDs[i] == id {
-					// Remove this reference to deleted attachment ID.
-					copy(status.AttachmentIDs[i:], status.AttachmentIDs[i+1:])
-					status.AttachmentIDs = status.AttachmentIDs[:len(status.AttachmentIDs)-1]
-					continue
-				}
-				i++
-			}
-
-			if before != len(status.AttachmentIDs) {
-				// Note: this accounts for status not found.
 				//
 				// Attachments changed, update the status.
 				if _, err := tx.NewUpdate().
 					Table("statuses").
 					Where("? = ?", bun.Ident("id"), status.ID).
-					Set("? = ?", bun.Ident("attachment_ids"), status.AttachmentIDs).
+					Set("? = ?", bun.Ident("attachment_ids"), updatedIDs).
 					Exec(ctx); err != nil {
 					return gtserror.Newf("error updating status: %w", err)
 				}
-
-				// Mark as needing invalidate.
-				invalidateStatus = true
 			}
 		}
 
@@ -219,16 +197,6 @@ func (m *mediaDB) DeleteAttachment(ctx context.Context, id string) error {
 		return nil
 	})
 
-	if invalidateAccount {
-		// The account for given ID will have been updated in transaction.
-		m.state.Caches.GTS.Account().Invalidate("ID", media.AccountID)
-	}
-
-	if invalidateStatus {
-		// The status for given ID will have been updated in transaction.
-		m.state.Caches.GTS.Status().Invalidate("ID", media.StatusID)
-	}
-
 	return m.db.ProcessError(err)
 }
 

internal/db/bundb/relationship.go

@@ -20,11 +20,12 @@ package bundb
 import (
 	"context"
 	"errors"
-	"fmt"
 
 	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/paging"
 	"github.com/superseriousbusiness/gotosocial/internal/state"
 	"github.com/uptrace/bun"
 )
@@ -45,7 +46,7 @@ func (r *relationshipDB) GetRelationship(ctx context.Context, requestingAccount
 		targetAccount,
 	)
 	if err != nil && !errors.Is(err, db.ErrNoEntries) {
-		return nil, fmt.Errorf("GetRelationship: error fetching follow: %w", err)
+		return nil, gtserror.Newf("error fetching follow: %w", err)
 	}
 
 	if follow != nil {
@@ -61,7 +62,7 @@ func (r *relationshipDB) GetRelationship(ctx context.Context, requestingAccount
 		requestingAccount,
 	)
 	if err != nil {
-		return nil, fmt.Errorf("GetRelationship: error checking followedBy: %w", err)
+		return nil, gtserror.Newf("error checking followedBy: %w", err)
 	}
 
 	// check if requesting has follow requested target
@@ -70,19 +71,19 @@ func (r *relationshipDB) GetRelationship(ctx context.Context, requestingAccount
 		targetAccount,
 	)
 	if err != nil {
-		return nil, fmt.Errorf("GetRelationship: error checking requested: %w", err)
+		return nil, gtserror.Newf("error checking requested: %w", err)
 	}
 
 	// check if the requesting account is blocking the target account
 	rel.Blocking, err = r.IsBlocked(ctx, requestingAccount, targetAccount)
 	if err != nil {
-		return nil, fmt.Errorf("GetRelationship: error checking blocking: %w", err)
+		return nil, gtserror.Newf("error checking blocking: %w", err)
 	}
 
 	// check if the requesting account is blocked by the target account
 	rel.BlockedBy, err = r.IsBlocked(ctx, targetAccount, requestingAccount)
 	if err != nil {
-		return nil, fmt.Errorf("GetRelationship: error checking blockedBy: %w", err)
+		return nil, gtserror.Newf("error checking blockedBy: %w", err)
 	}
 
 	// retrieve a note by the requesting account on the target account, if there is one
@@ -92,7 +93,7 @@ func (r *relationshipDB) GetRelationship(ctx context.Context, requestingAccount
 		targetAccount,
 	)
 	if err != nil && !errors.Is(err, db.ErrNoEntries) {
-		return nil, fmt.Errorf("GetRelationship: error fetching note: %w", err)
+		return nil, gtserror.Newf("error fetching note: %w", err)
 	}
 	if note != nil {
 		rel.Note = note.Comment
@@ -102,87 +103,186 @@ func (r *relationshipDB) GetRelationship(ctx context.Context, requestingAccount
 }
 
 func (r *relationshipDB) GetAccountFollows(ctx context.Context, accountID string) ([]*gtsmodel.Follow, error) {
-	var followIDs []string
+	followIDs, err := r.getAccountFollowIDs(ctx, accountID)
-	if err := newSelectFollows(r.db, accountID).
+	if err != nil {
-		Scan(ctx, &followIDs); err != nil {
+		return nil, err
-		return nil, r.db.ProcessError(err)
 	}
 	return r.GetFollowsByIDs(ctx, followIDs)
 }
 
 func (r *relationshipDB) GetAccountLocalFollows(ctx context.Context, accountID string) ([]*gtsmodel.Follow, error) {
-	var followIDs []string
+	followIDs, err := r.getAccountLocalFollowIDs(ctx, accountID)
-	if err := newSelectLocalFollows(r.db, accountID).
+	if err != nil {
-		Scan(ctx, &followIDs); err != nil {
+		return nil, err
-		return nil, r.db.ProcessError(err)
 	}
 	return r.GetFollowsByIDs(ctx, followIDs)
 }
 
 func (r *relationshipDB) GetAccountFollowers(ctx context.Context, accountID string) ([]*gtsmodel.Follow, error) {
-	var followIDs []string
+	followerIDs, err := r.getAccountFollowerIDs(ctx, accountID)
-	if err := newSelectFollowers(r.db, accountID).
+	if err != nil {
-		Scan(ctx, &followIDs); err != nil {
+		return nil, err
-		return nil, r.db.ProcessError(err)
 	}
-	return r.GetFollowsByIDs(ctx, followIDs)
+	return r.GetFollowsByIDs(ctx, followerIDs)
 }
 
 func (r *relationshipDB) GetAccountLocalFollowers(ctx context.Context, accountID string) ([]*gtsmodel.Follow, error) {
-	var followIDs []string
+	followerIDs, err := r.getAccountLocalFollowerIDs(ctx, accountID)
-	if err := newSelectLocalFollowers(r.db, accountID).
+	if err != nil {
-		Scan(ctx, &followIDs); err != nil {
+		return nil, err
-		return nil, r.db.ProcessError(err)
 	}
-	return r.GetFollowsByIDs(ctx, followIDs)
+	return r.GetFollowsByIDs(ctx, followerIDs)
-}
-
-func (r *relationshipDB) CountAccountFollows(ctx context.Context, accountID string) (int, error) {
-	n, err := newSelectFollows(r.db, accountID).Count(ctx)
-	return n, r.db.ProcessError(err)
-}
-
-func (r *relationshipDB) CountAccountLocalFollows(ctx context.Context, accountID string) (int, error) {
-	n, err := newSelectLocalFollows(r.db, accountID).Count(ctx)
-	return n, r.db.ProcessError(err)
-}
-
-func (r *relationshipDB) CountAccountFollowers(ctx context.Context, accountID string) (int, error) {
-	n, err := newSelectFollowers(r.db, accountID).Count(ctx)
-	return n, r.db.ProcessError(err)
-}
-
-func (r *relationshipDB) CountAccountLocalFollowers(ctx context.Context, accountID string) (int, error) {
-	n, err := newSelectLocalFollowers(r.db, accountID).Count(ctx)
-	return n, r.db.ProcessError(err)
 }
 
 func (r *relationshipDB) GetAccountFollowRequests(ctx context.Context, accountID string) ([]*gtsmodel.FollowRequest, error) {
-	var followReqIDs []string
+	followReqIDs, err := r.getAccountFollowRequestIDs(ctx, accountID)
-	if err := newSelectFollowRequests(r.db, accountID).
+	if err != nil {
-		Scan(ctx, &followReqIDs); err != nil {
+		return nil, err
-		return nil, r.db.ProcessError(err)
 	}
 	return r.GetFollowRequestsByIDs(ctx, followReqIDs)
 }
 
 func (r *relationshipDB) GetAccountFollowRequesting(ctx context.Context, accountID string) ([]*gtsmodel.FollowRequest, error) {
-	var followReqIDs []string
+	followReqIDs, err := r.getAccountFollowRequestingIDs(ctx, accountID)
-	if err := newSelectFollowRequesting(r.db, accountID).
+	if err != nil {
-		Scan(ctx, &followReqIDs); err != nil {
+		return nil, err
-		return nil, r.db.ProcessError(err)
 	}
 	return r.GetFollowRequestsByIDs(ctx, followReqIDs)
 }
 
+func (r *relationshipDB) GetAccountBlocks(ctx context.Context, accountID string, page *paging.Pager) ([]*gtsmodel.Block, error) {
+	// Load block IDs from cache with database loader callback.
+	blockIDs, err := r.state.Caches.GTS.BlockIDs().LoadRange(accountID, func() ([]string, error) {
+		var blockIDs []string
+
+		// Block IDs not in cache, perform DB query!
+		q := newSelectBlocks(r.db, accountID)
+		if _, err := q.Exec(ctx, &blockIDs); err != nil {
+			return nil, r.db.ProcessError(err)
+		}
+
+		return blockIDs, nil
+	}, page.PageDesc)
+	if err != nil {
+		return nil, err
+	}
+
+	// Convert these IDs to full block objects.
+	return r.GetBlocksByIDs(ctx, blockIDs)
+}
+
+func (r *relationshipDB) CountAccountFollows(ctx context.Context, accountID string) (int, error) {
+	followIDs, err := r.getAccountFollowIDs(ctx, accountID)
+	return len(followIDs), err
+}
+
+func (r *relationshipDB) CountAccountLocalFollows(ctx context.Context, accountID string) (int, error) {
+	followIDs, err := r.getAccountLocalFollowIDs(ctx, accountID)
+	return len(followIDs), err
+}
+
+func (r *relationshipDB) CountAccountFollowers(ctx context.Context, accountID string) (int, error) {
+	followerIDs, err := r.getAccountFollowerIDs(ctx, accountID)
+	return len(followerIDs), err
+}
+
+func (r *relationshipDB) CountAccountLocalFollowers(ctx context.Context, accountID string) (int, error) {
+	followerIDs, err := r.getAccountLocalFollowerIDs(ctx, accountID)
+	return len(followerIDs), err
+}
+
 func (r *relationshipDB) CountAccountFollowRequests(ctx context.Context, accountID string) (int, error) {
-	n, err := newSelectFollowRequests(r.db, accountID).Count(ctx)
+	followReqIDs, err := r.getAccountFollowRequestIDs(ctx, accountID)
-	return n, r.db.ProcessError(err)
+	return len(followReqIDs), err
 }
 
 func (r *relationshipDB) CountAccountFollowRequesting(ctx context.Context, accountID string) (int, error) {
-	n, err := newSelectFollowRequesting(r.db, accountID).Count(ctx)
+	followReqIDs, err := r.getAccountFollowRequestingIDs(ctx, accountID)
-	return n, r.db.ProcessError(err)
+	return len(followReqIDs), err
+}
+
+func (r *relationshipDB) getAccountFollowIDs(ctx context.Context, accountID string) ([]string, error) {
+	return r.state.Caches.GTS.FollowIDs().Load(">"+accountID, func() ([]string, error) {
+		var followIDs []string
+
+		// Follow IDs not in cache, perform DB query!
+		q := newSelectFollows(r.db, accountID)
+		if _, err := q.Exec(ctx, &followIDs); err != nil {
+			return nil, r.db.ProcessError(err)
+		}
+
+		return followIDs, nil
+	})
+}
+
+func (r *relationshipDB) getAccountLocalFollowIDs(ctx context.Context, accountID string) ([]string, error) {
+	return r.state.Caches.GTS.FollowIDs().Load("l>"+accountID, func() ([]string, error) {
+		var followIDs []string
+
+		// Follow IDs not in cache, perform DB query!
+		q := newSelectLocalFollows(r.db, accountID)
+		if _, err := q.Exec(ctx, &followIDs); err != nil {
+			return nil, r.db.ProcessError(err)
+		}
+
+		return followIDs, nil
+	})
+}
+
+func (r *relationshipDB) getAccountFollowerIDs(ctx context.Context, accountID string) ([]string, error) {
+	return r.state.Caches.GTS.FollowIDs().Load("<"+accountID, func() ([]string, error) {
+		var followIDs []string
+
+		// Follow IDs not in cache, perform DB query!
+		q := newSelectFollowers(r.db, accountID)
+		if _, err := q.Exec(ctx, &followIDs); err != nil {
+			return nil, r.db.ProcessError(err)
+		}
+
+		return followIDs, nil
+	})
+}
+
+func (r *relationshipDB) getAccountLocalFollowerIDs(ctx context.Context, accountID string) ([]string, error) {
+	return r.state.Caches.GTS.FollowIDs().Load("l<"+accountID, func() ([]string, error) {
+		var followIDs []string
+
+		// Follow IDs not in cache, perform DB query!
+		q := newSelectLocalFollowers(r.db, accountID)
+		if _, err := q.Exec(ctx, &followIDs); err != nil {
+			return nil, r.db.ProcessError(err)
+		}
+
+		return followIDs, nil
+	})
+}
+
+func (r *relationshipDB) getAccountFollowRequestIDs(ctx context.Context, accountID string) ([]string, error) {
+	return r.state.Caches.GTS.FollowRequestIDs().Load(">"+accountID, func() ([]string, error) {
+		var followReqIDs []string
+
+		// Follow request IDs not in cache, perform DB query!
+		q := newSelectFollowRequests(r.db, accountID)
+		if _, err := q.Exec(ctx, &followReqIDs); err != nil {
+			return nil, r.db.ProcessError(err)
+		}
+
+		return followReqIDs, nil
+	})
+}
+
+func (r *relationshipDB) getAccountFollowRequestingIDs(ctx context.Context, accountID string) ([]string, error) {
+	return r.state.Caches.GTS.FollowRequestIDs().Load("<"+accountID, func() ([]string, error) {
+		var followReqIDs []string
+
+		// Follow request IDs not in cache, perform DB query!
+		q := newSelectFollowRequesting(r.db, accountID)
+		if _, err := q.Exec(ctx, &followReqIDs); err != nil {
+			return nil, r.db.ProcessError(err)
+		}
+
+		return followReqIDs, nil
+	})
 }
 
 // newSelectFollowRequests returns a new select query for all rows in the follow_requests table with target_account_id = accountID.
@@ -256,3 +356,12 @@ func newSelectLocalFollowers(db *WrappedDB, accountID string) *bun.SelectQuery {
 		).
 		OrderExpr("? DESC", bun.Ident("updated_at"))
 }
+
+// newSelectBlocks returns a new select query for all rows in the blocks table with account_id = accountID.
+func newSelectBlocks(db *WrappedDB, accountID string) *bun.SelectQuery {
+	return db.NewSelect().
+		TableExpr("?", bun.Ident("blocks")).
+		ColumnExpr("?", bun.Ident("?")).
+		Where("? = ?", bun.Ident("account_id"), accountID).
+		OrderExpr("? DESC", bun.Ident("updated_at"))
+}

internal/db/bundb/relationship_block.go

@@ -25,6 +25,7 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/log"
 	"github.com/uptrace/bun"
 )
 
@@ -97,6 +98,25 @@ func (r *relationshipDB) GetBlock(ctx context.Context, sourceAccountID string, t
 	)
 }
 
+func (r *relationshipDB) GetBlocksByIDs(ctx context.Context, ids []string) ([]*gtsmodel.Block, error) {
+	// Preallocate slice of expected length.
+	blocks := make([]*gtsmodel.Block, 0, len(ids))
+
+	for _, id := range ids {
+		// Fetch block model for this ID.
+		block, err := r.GetBlockByID(ctx, id)
+		if err != nil {
+			log.Errorf(ctx, "error getting block %q: %v", id, err)
+			continue
+		}
+
+		// Append to return slice.
+		blocks = append(blocks, block)
+	}
+
+	return blocks, nil
+}
+
 func (r *relationshipDB) getBlock(ctx context.Context, lookup string, dbQuery func(*gtsmodel.Block) error, keyParts ...any) (*gtsmodel.Block, error) {
 	// Fetch block from cache with loader callback
 	block, err := r.state.Caches.GTS.Block().Load(lookup, func() (*gtsmodel.Block, error) {
@@ -148,8 +168,6 @@ func (r *relationshipDB) PutBlock(ctx context.Context, block *gtsmodel.Block) er
 }
 
 func (r *relationshipDB) DeleteBlockByID(ctx context.Context, id string) error {
-	defer r.state.Caches.GTS.Block().Invalidate("ID", id)
-
 	// Load block into cache before attempting a delete,
 	// as we need it cached in order to trigger the invalidate
 	// callback. This in turn invalidates others.
@@ -162,6 +180,9 @@ func (r *relationshipDB) DeleteBlockByID(ctx context.Context, id string) error {
 		return err
 	}
 
+	// Drop this now-cached block on return after delete.
+	defer r.state.Caches.GTS.Block().Invalidate("ID", id)
+
 	// Finally delete block from DB.
 	_, err = r.db.NewDelete().
 		Table("blocks").
@@ -171,8 +192,6 @@ func (r *relationshipDB) DeleteBlockByID(ctx context.Context, id string) error {
 }
 
 func (r *relationshipDB) DeleteBlockByURI(ctx context.Context, uri string) error {
-	defer r.state.Caches.GTS.Block().Invalidate("URI", uri)
-
 	// Load block into cache before attempting a delete,
 	// as we need it cached in order to trigger the invalidate
 	// callback. This in turn invalidates others.
@@ -185,6 +204,9 @@ func (r *relationshipDB) DeleteBlockByURI(ctx context.Context, uri string) error
 		return err
 	}
 
+	// Drop this now-cached block on return after delete.
+	defer r.state.Caches.GTS.Block().Invalidate("URI", uri)
+
 	// Finally delete block from DB.
 	_, err = r.db.NewDelete().
 		Table("blocks").
@@ -211,10 +233,9 @@ func (r *relationshipDB) DeleteAccountBlocks(ctx context.Context, accountID stri
 	}
 
 	defer func() {
-		// Invalidate all IDs on return.
+		// Invalidate all account's incoming / outoing blocks on return.
-		for _, id := range blockIDs {
+		r.state.Caches.GTS.Block().Invalidate("AccountID", accountID)
-			r.state.Caches.GTS.Block().Invalidate("ID", id)
+		r.state.Caches.GTS.Block().Invalidate("TargetAccountID", accountID)
-		}
 	}()
 
 	// Load all blocks into cache, this *really* isn't great

internal/db/bundb/relationship_follow.go

@@ -233,8 +233,6 @@ func (r *relationshipDB) deleteFollow(ctx context.Context, id string) error {
 }
 
 func (r *relationshipDB) DeleteFollow(ctx context.Context, sourceAccountID string, targetAccountID string) error {
-	defer r.state.Caches.GTS.Follow().Invalidate("AccountID.TargetAccountID", sourceAccountID, targetAccountID)
-
 	// Load follow into cache before attempting a delete,
 	// as we need it cached in order to trigger the invalidate
 	// callback. This in turn invalidates others.
@@ -251,13 +249,14 @@ func (r *relationshipDB) DeleteFollow(ctx context.Context, sourceAccountID strin
 		return err
 	}
 
+	// Drop this now-cached follow on return after delete.
+	defer r.state.Caches.GTS.Follow().Invalidate("AccountID.TargetAccountID", sourceAccountID, targetAccountID)
+
 	// Finally delete follow from DB.
 	return r.deleteFollow(ctx, follow.ID)
 }
 
 func (r *relationshipDB) DeleteFollowByID(ctx context.Context, id string) error {
-	defer r.state.Caches.GTS.Follow().Invalidate("ID", id)
-
 	// Load follow into cache before attempting a delete,
 	// as we need it cached in order to trigger the invalidate
 	// callback. This in turn invalidates others.
@@ -270,13 +269,14 @@ func (r *relationshipDB) DeleteFollowByID(ctx context.Context, id string) error
 		return err
 	}
 
+	// Drop this now-cached follow on return after delete.
+	defer r.state.Caches.GTS.Follow().Invalidate("ID", id)
+
 	// Finally delete follow from DB.
 	return r.deleteFollow(ctx, follow.ID)
 }
 
 func (r *relationshipDB) DeleteFollowByURI(ctx context.Context, uri string) error {
-	defer r.state.Caches.GTS.Follow().Invalidate("URI", uri)
-
 	// Load follow into cache before attempting a delete,
 	// as we need it cached in order to trigger the invalidate
 	// callback. This in turn invalidates others.
@@ -289,6 +289,9 @@ func (r *relationshipDB) DeleteFollowByURI(ctx context.Context, uri string) erro
 		return err
 	}
 
+	// Drop this now-cached follow on return after delete.
+	defer r.state.Caches.GTS.Follow().Invalidate("URI", uri)
+
 	// Finally delete follow from DB.
 	return r.deleteFollow(ctx, follow.ID)
 }
@@ -312,10 +315,9 @@ func (r *relationshipDB) DeleteAccountFollows(ctx context.Context, accountID str
 	}
 
 	defer func() {
-		// Invalidate all IDs on return.
+		// Invalidate all account's incoming / outoing follows on return.
-		for _, id := range followIDs {
+		r.state.Caches.GTS.Follow().Invalidate("AccountID", accountID)
-			r.state.Caches.GTS.Follow().Invalidate("ID", id)
+		r.state.Caches.GTS.Follow().Invalidate("TargetAccountID", accountID)
-		}
 	}()
 
 	// Load all follows into cache, this *really* isn't great

internal/db/bundb/relationship_follow_req.go

@@ -208,9 +208,6 @@ func (r *relationshipDB) AcceptFollowRequest(ctx context.Context, sourceAccountI
 		return nil, err
 	}
 
-	// Invalidate follow request from cache lookups on return.
-	defer r.state.Caches.GTS.FollowRequest().Invalidate("ID", followReq.ID)
-
 	// Delete original follow request.
 	if _, err := r.db.
 		NewDelete().
@@ -243,8 +240,6 @@ func (r *relationshipDB) RejectFollowRequest(ctx context.Context, sourceAccountI
 }
 
 func (r *relationshipDB) DeleteFollowRequest(ctx context.Context, sourceAccountID string, targetAccountID string) error {
-	defer r.state.Caches.GTS.FollowRequest().Invalidate("AccountID.TargetAccountID", sourceAccountID, targetAccountID)
-
 	// Load followreq into cache before attempting a delete,
 	// as we need it cached in order to trigger the invalidate
 	// callback. This in turn invalidates others.
@@ -261,6 +256,9 @@ func (r *relationshipDB) DeleteFollowRequest(ctx context.Context, sourceAccountI
 		return err
 	}
 
+	// Drop this now-cached follow request on return after delete.
+	defer r.state.Caches.GTS.FollowRequest().Invalidate("AccountID.TargetAccountID", sourceAccountID, targetAccountID)
+
 	// Finally delete followreq from DB.
 	_, err = r.db.NewDelete().
 		Table("follow_requests").
@@ -270,8 +268,6 @@ func (r *relationshipDB) DeleteFollowRequest(ctx context.Context, sourceAccountI
 }
 
 func (r *relationshipDB) DeleteFollowRequestByID(ctx context.Context, id string) error {
-	defer r.state.Caches.GTS.FollowRequest().Invalidate("ID", id)
-
 	// Load followreq into cache before attempting a delete,
 	// as we need it cached in order to trigger the invalidate
 	// callback. This in turn invalidates others.
@@ -284,6 +280,9 @@ func (r *relationshipDB) DeleteFollowRequestByID(ctx context.Context, id string)
 		return err
 	}
 
+	// Drop this now-cached follow request on return after delete.
+	defer r.state.Caches.GTS.FollowRequest().Invalidate("ID", id)
+
 	// Finally delete followreq from DB.
 	_, err = r.db.NewDelete().
 		Table("follow_requests").
@@ -293,8 +292,6 @@ func (r *relationshipDB) DeleteFollowRequestByID(ctx context.Context, id string)
 }
 
 func (r *relationshipDB) DeleteFollowRequestByURI(ctx context.Context, uri string) error {
-	defer r.state.Caches.GTS.FollowRequest().Invalidate("URI", uri)
-
 	// Load followreq into cache before attempting a delete,
 	// as we need it cached in order to trigger the invalidate
 	// callback. This in turn invalidates others.
@@ -307,6 +304,9 @@ func (r *relationshipDB) DeleteFollowRequestByURI(ctx context.Context, uri strin
 		return err
 	}
 
+	// Drop this now-cached follow request on return after delete.
+	defer r.state.Caches.GTS.FollowRequest().Invalidate("URI", uri)
+
 	// Finally delete followreq from DB.
 	_, err = r.db.NewDelete().
 		Table("follow_requests").
@@ -334,10 +334,9 @@ func (r *relationshipDB) DeleteAccountFollowRequests(ctx context.Context, accoun
 	}
 
 	defer func() {
-		// Invalidate all IDs on return.
+		// Invalidate all account's incoming / outoing follow requests on return.
-		for _, id := range followReqIDs {
+		r.state.Caches.GTS.FollowRequest().Invalidate("AccountID", accountID)
-			r.state.Caches.GTS.FollowRequest().Invalidate("ID", id)
+		r.state.Caches.GTS.FollowRequest().Invalidate("TargetAccountID", accountID)
-		}
 	}()
 
 	// Load all followreqs into cache, this *really* isn't

internal/db/bundb/status.go

@@ -381,8 +381,6 @@ func (s *statusDB) UpdateStatus(ctx context.Context, status *gtsmodel.Status, co
 }
 
 func (s *statusDB) DeleteStatusByID(ctx context.Context, id string) error {
-	defer s.state.Caches.GTS.Status().Invalidate("ID", id)
-
 	// Load status into cache before attempting a delete,
 	// as we need it cached in order to trigger the invalidate
 	// callback. This in turn invalidates others.
@@ -397,6 +395,9 @@ func (s *statusDB) DeleteStatusByID(ctx context.Context, id string) error {
 		return err
 	}
 
+	// On return ensure status invalidated from cache.
+	defer s.state.Caches.GTS.Status().Invalidate("ID", id)
+
 	return s.db.RunInTx(ctx, func(tx bun.Tx) error {
 		// delete links between this status and any emojis it uses
 		if _, err := tx.

internal/db/relationship.go

@@ -21,6 +21,7 @@ import (
 	"context"
 
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/paging"
 )
 
 // Relationship contains functions for getting or modifying the relationship between two accounts.
@@ -166,6 +167,9 @@ type Relationship interface {
 	// CountAccountFollowerRequests returns number of follow requests originating from the given account.
 	CountAccountFollowRequesting(ctx context.Context, accountID string) (int, error)
 
+	// GetAccountBlocks returns all blocks originating from the given account, with given optional paging parameters.
+	GetAccountBlocks(ctx context.Context, accountID string, paging *paging.Pager) ([]*gtsmodel.Block, error)
+
 	// GetNote gets a private note from a source account on a target account, if it exists.
 	GetNote(ctx context.Context, sourceAccountID string, targetAccountID string) (*gtsmodel.AccountNote, error)
 

internal/paging/paging.go

@@ -0,0 +1,227 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package paging
+
+import "golang.org/x/exp/slices"
+
+// Pager provides a means of paging serialized IDs,
+// using the terminology of our API endpoint queries.
+type Pager struct {
+	// SinceID will limit the returned
+	// page of IDs to contain newer than
+	// since ID (excluding it). Result
+	// will be returned DESCENDING.
+	SinceID string
+
+	// MinID will limit the returned
+	// page of IDs to contain newer than
+	// min ID (excluding it). Result
+	// will be returned ASCENDING.
+	MinID string
+
+	// MaxID will limit the returned
+	// page of IDs to contain older
+	// than (excluding) this max ID.
+	MaxID string
+
+	// Limit will limit the returned
+	// page of IDs to at most 'limit'.
+	Limit int
+}
+
+// Page will page the given slice of GoToSocial IDs according
+// to the receiving Pager's SinceID, MinID, MaxID and Limits.
+// NOTE THE INPUT SLICE MUST BE SORTED IN ASCENDING ORDER
+// (I.E. OLDEST ITEMS AT LOWEST INDICES, NEWER AT HIGHER).
+func (p *Pager) PageAsc(ids []string) []string {
+	if p == nil {
+		// no paging.
+		return ids
+	}
+
+	var asc bool
+
+	if p.SinceID != "" {
+		// If a sinceID is given, we
+		// page down i.e. descending.
+		asc = false
+
+		for i := 0; i < len(ids); i++ {
+			if ids[i] == p.SinceID {
+				// Hit the boundary.
+				// Reslice to be:
+				// "from here"
+				ids = ids[i+1:]
+				break
+			}
+		}
+	} else if p.MinID != "" {
+		// We only support minID if
+		// no sinceID is provided.
+		//
+		// If a minID is given, we
+		// page up, i.e. ascending.
+		asc = true
+
+		for i := 0; i < len(ids); i++ {
+			if ids[i] == p.MinID {
+				// Hit the boundary.
+				// Reslice to be:
+				// "from here"
+				ids = ids[i+1:]
+				break
+			}
+		}
+	}
+
+	if p.MaxID != "" {
+		for i := 0; i < len(ids); i++ {
+			if ids[i] == p.MaxID {
+				// Hit the boundary.
+				// Reslice to be:
+				// "up to here"
+				ids = ids[:i]
+				break
+			}
+		}
+	}
+
+	if !asc && len(ids) > 1 {
+		var (
+			// Start at front.
+			i = 0
+
+			// Start at back.
+			j = len(ids) - 1
+		)
+
+		// Clone input IDs before
+		// we perform modifications.
+		ids = slices.Clone(ids)
+
+		for i < j {
+			// Swap i,j index values in slice.
+			ids[i], ids[j] = ids[j], ids[i]
+
+			// incr + decr,
+			// looping until
+			// they meet in
+			// the middle.
+			i++
+			j--
+		}
+	}
+
+	if p.Limit > 0 && p.Limit < len(ids) {
+		// Reslice IDs to given limit.
+		ids = ids[:p.Limit]
+	}
+
+	return ids
+}
+
+// Page will page the given slice of GoToSocial IDs according
+// to the receiving Pager's SinceID, MinID, MaxID and Limits.
+// NOTE THE INPUT SLICE MUST BE SORTED IN ASCENDING ORDER.
+// (I.E. NEWEST ITEMS AT LOWEST INDICES, OLDER AT HIGHER).
+func (p *Pager) PageDesc(ids []string) []string {
+	if p == nil {
+		// no paging.
+		return ids
+	}
+
+	var asc bool
+
+	if p.MaxID != "" {
+		for i := 0; i < len(ids); i++ {
+			if ids[i] == p.MaxID {
+				// Hit the boundary.
+				// Reslice to be:
+				// "from here"
+				ids = ids[i+1:]
+				break
+			}
+		}
+	}
+
+	if p.SinceID != "" {
+		// If a sinceID is given, we
+		// page down i.e. descending.
+		asc = false
+
+		for i := 0; i < len(ids); i++ {
+			if ids[i] == p.SinceID {
+				// Hit the boundary.
+				// Reslice to be:
+				// "up to here"
+				ids = ids[:i]
+				break
+			}
+		}
+	} else if p.MinID != "" {
+		// We only support minID if
+		// no sinceID is provided.
+		//
+		// If a minID is given, we
+		// page up, i.e. ascending.
+		asc = true
+
+		for i := 0; i < len(ids); i++ {
+			if ids[i] == p.MinID {
+				// Hit the boundary.
+				// Reslice to be:
+				// "up to here"
+				ids = ids[:i]
+				break
+			}
+		}
+	}
+
+	if asc && len(ids) > 1 {
+		var (
+			// Start at front.
+			i = 0
+
+			// Start at back.
+			j = len(ids) - 1
+		)
+
+		// Clone input IDs before
+		// we perform modifications.
+		ids = slices.Clone(ids)
+
+		for i < j {
+			// Swap i,j index values in slice.
+			ids[i], ids[j] = ids[j], ids[i]
+
+			// incr + decr,
+			// looping until
+			// they meet in
+			// the middle.
+			i++
+			j--
+		}
+	}
+
+	if p.Limit > 0 && p.Limit < len(ids) {
+		// Reslice IDs to given limit.
+		ids = ids[:p.Limit]
+	}
+
+	return ids
+}

internal/paging/paging_test.go

@@ -0,0 +1,171 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package paging_test
+
+import (
+	"testing"
+
+	"github.com/superseriousbusiness/gotosocial/internal/paging"
+	"golang.org/x/exp/slices"
+)
+
+type Case struct {
+	// Name is the test case name.
+	Name string
+
+	// Input contains test case input ID slice.
+	Input []string
+
+	// Expect contains expected test case output.
+	Expect []string
+
+	// Page contains the paging function to use.
+	Page func([]string) []string
+}
+
+var cases = []Case{
+	{
+		Name: "min_id and max_id set",
+		Input: []string{
+			"064Q5D7VG6TPPQ46T09MHJ96FW",
+			"064Q5D7VGPTC4NK5T070VYSSF8",
+			"064Q5D7VH5F0JXG6W5NCQ3JCWW",
+			"064Q5D7VHMSW9DF3GCS088VAZC",
+			"064Q5D7VJ073XG9ZTWHA2KHN10",
+			"064Q5D7VJADJTPA3GW8WAX10TW",
+			"064Q5D7VJMWXZD3S1KT7RD51N8",
+			"064Q5D7VJYFBYSAH86KDBKZ6AC",
+			"064Q5D7VK8H7WMJS399SHEPCB0",
+			"064Q5D7VKG5EQ43TYP71B4K6K0",
+		},
+		Expect: []string{
+			"064Q5D7VGPTC4NK5T070VYSSF8",
+			"064Q5D7VH5F0JXG6W5NCQ3JCWW",
+			"064Q5D7VHMSW9DF3GCS088VAZC",
+			"064Q5D7VJ073XG9ZTWHA2KHN10",
+			"064Q5D7VJADJTPA3GW8WAX10TW",
+			"064Q5D7VJMWXZD3S1KT7RD51N8",
+			"064Q5D7VJYFBYSAH86KDBKZ6AC",
+			"064Q5D7VK8H7WMJS399SHEPCB0",
+		},
+		Page: (&paging.Pager{
+			MinID: "064Q5D7VG6TPPQ46T09MHJ96FW",
+			MaxID: "064Q5D7VKG5EQ43TYP71B4K6K0",
+		}).PageAsc,
+	},
+	{
+		Name: "min_id, max_id and limit set",
+		Input: []string{
+			"064Q5D7VG6TPPQ46T09MHJ96FW",
+			"064Q5D7VGPTC4NK5T070VYSSF8",
+			"064Q5D7VH5F0JXG6W5NCQ3JCWW",
+			"064Q5D7VHMSW9DF3GCS088VAZC",
+			"064Q5D7VJ073XG9ZTWHA2KHN10",
+			"064Q5D7VJADJTPA3GW8WAX10TW",
+			"064Q5D7VJMWXZD3S1KT7RD51N8",
+			"064Q5D7VJYFBYSAH86KDBKZ6AC",
+			"064Q5D7VK8H7WMJS399SHEPCB0",
+			"064Q5D7VKG5EQ43TYP71B4K6K0",
+		},
+		Expect: []string{
+			"064Q5D7VGPTC4NK5T070VYSSF8",
+			"064Q5D7VH5F0JXG6W5NCQ3JCWW",
+			"064Q5D7VHMSW9DF3GCS088VAZC",
+			"064Q5D7VJ073XG9ZTWHA2KHN10",
+			"064Q5D7VJADJTPA3GW8WAX10TW",
+		},
+		Page: (&paging.Pager{
+			MinID: "064Q5D7VG6TPPQ46T09MHJ96FW",
+			MaxID: "064Q5D7VKG5EQ43TYP71B4K6K0",
+			Limit: 5,
+		}).PageAsc,
+	},
+	{
+		Name: "min_id, max_id and too-large limit set",
+		Input: []string{
+			"064Q5D7VG6TPPQ46T09MHJ96FW",
+			"064Q5D7VGPTC4NK5T070VYSSF8",
+			"064Q5D7VH5F0JXG6W5NCQ3JCWW",
+			"064Q5D7VHMSW9DF3GCS088VAZC",
+			"064Q5D7VJ073XG9ZTWHA2KHN10",
+			"064Q5D7VJADJTPA3GW8WAX10TW",
+			"064Q5D7VJMWXZD3S1KT7RD51N8",
+			"064Q5D7VJYFBYSAH86KDBKZ6AC",
+			"064Q5D7VK8H7WMJS399SHEPCB0",
+			"064Q5D7VKG5EQ43TYP71B4K6K0",
+		},
+		Expect: []string{
+			"064Q5D7VGPTC4NK5T070VYSSF8",
+			"064Q5D7VH5F0JXG6W5NCQ3JCWW",
+			"064Q5D7VHMSW9DF3GCS088VAZC",
+			"064Q5D7VJ073XG9ZTWHA2KHN10",
+			"064Q5D7VJADJTPA3GW8WAX10TW",
+			"064Q5D7VJMWXZD3S1KT7RD51N8",
+			"064Q5D7VJYFBYSAH86KDBKZ6AC",
+			"064Q5D7VK8H7WMJS399SHEPCB0",
+		},
+		Page: (&paging.Pager{
+			MinID: "064Q5D7VG6TPPQ46T09MHJ96FW",
+			MaxID: "064Q5D7VKG5EQ43TYP71B4K6K0",
+			Limit: 100,
+		}).PageAsc,
+	},
+	{
+		Name: "since_id and max_id set",
+		Input: []string{
+			"064Q5D7VG6TPPQ46T09MHJ96FW",
+			"064Q5D7VGPTC4NK5T070VYSSF8",
+			"064Q5D7VH5F0JXG6W5NCQ3JCWW",
+			"064Q5D7VHMSW9DF3GCS088VAZC",
+			"064Q5D7VJ073XG9ZTWHA2KHN10",
+			"064Q5D7VJADJTPA3GW8WAX10TW",
+			"064Q5D7VJMWXZD3S1KT7RD51N8",
+			"064Q5D7VJYFBYSAH86KDBKZ6AC",
+			"064Q5D7VK8H7WMJS399SHEPCB0",
+			"064Q5D7VKG5EQ43TYP71B4K6K0",
+		},
+		Expect: []string{
+			"064Q5D7VK8H7WMJS399SHEPCB0",
+			"064Q5D7VJYFBYSAH86KDBKZ6AC",
+			"064Q5D7VJMWXZD3S1KT7RD51N8",
+			"064Q5D7VJADJTPA3GW8WAX10TW",
+			"064Q5D7VJ073XG9ZTWHA2KHN10",
+			"064Q5D7VHMSW9DF3GCS088VAZC",
+			"064Q5D7VH5F0JXG6W5NCQ3JCWW",
+			"064Q5D7VGPTC4NK5T070VYSSF8",
+		},
+		Page: (&paging.Pager{
+			SinceID: "064Q5D7VG6TPPQ46T09MHJ96FW",
+			MaxID:   "064Q5D7VKG5EQ43TYP71B4K6K0",
+		}).PageAsc,
+	},
+}
+
+func TestPage(t *testing.T) {
+	for _, c := range cases {
+		t.Run(c.Name, func(t *testing.T) {
+			// Page the input slice.
+			out := c.Page(c.Input)
+
+			// Check paged output is as expected.
+			if !slices.Equal(out, c.Expect) {
+				t.Errorf("\nreceived=%v\nexpect%v\n", out, c.Expect)
+			}
+		})
+	}
+}

internal/processing/account/delete.go

@@ -20,7 +20,6 @@ package account
 import (
 	"context"
 	"errors"
-	"fmt"
 	"net"
 	"time"
 
@@ -114,38 +113,38 @@ func (p *Processor) DeleteSelf(ctx context.Context, account *gtsmodel.Account) g
 func (p *Processor) deleteUserAndTokensForAccount(ctx context.Context, account *gtsmodel.Account) error {
 	user, err := p.state.DB.GetUserByAccountID(ctx, account.ID)
 	if err != nil {
-		return fmt.Errorf("deleteUserAndTokensForAccount: db error getting user: %w", err)
+		return gtserror.Newf("db error getting user: %w", err)
 	}
 
 	tokens := []*gtsmodel.Token{}
 	if err := p.state.DB.GetWhere(ctx, []db.Where{{Key: "user_id", Value: user.ID}}, &tokens); err != nil {
-		return fmt.Errorf("deleteUserAndTokensForAccount: db error getting tokens: %w", err)
+		return gtserror.Newf("db error getting tokens: %w", err)
 	}
 
 	for _, t := range tokens {
 		// Delete any OAuth clients associated with this token.
 		if err := p.state.DB.DeleteByID(ctx, t.ClientID, &[]*gtsmodel.Client{}); err != nil {
-			return fmt.Errorf("deleteUserAndTokensForAccount: db error deleting client: %w", err)
+			return gtserror.Newf("db error deleting client: %w", err)
 		}
 
 		// Delete any OAuth applications associated with this token.
 		if err := p.state.DB.DeleteWhere(ctx, []db.Where{{Key: "client_id", Value: t.ClientID}}, &[]*gtsmodel.Application{}); err != nil {
-			return fmt.Errorf("deleteUserAndTokensForAccount: db error deleting application: %w", err)
+			return gtserror.Newf("db error deleting application: %w", err)
 		}
 
 		// Delete the token itself.
 		if err := p.state.DB.DeleteByID(ctx, t.ID, t); err != nil {
-			return fmt.Errorf("deleteUserAndTokensForAccount: db error deleting token: %w", err)
+			return gtserror.Newf("db error deleting token: %w", err)
 		}
 	}
 
 	columns, err := stubbifyUser(user)
 	if err != nil {
-		return fmt.Errorf("deleteUserAndTokensForAccount: error stubbifying user: %w", err)
+		return gtserror.Newf("error stubbifying user: %w", err)
 	}
 
 	if err := p.state.DB.UpdateUser(ctx, user, columns...); err != nil {
-		return fmt.Errorf("deleteUserAndTokensForAccount: db error updating user: %w", err)
+		return gtserror.Newf("db error updating user: %w", err)
 	}
 
 	return nil
@@ -160,24 +159,24 @@ func (p *Processor) deleteAccountFollows(ctx context.Context, account *gtsmodel.
 	// Delete follows targeting this account.
 	followedBy, err := p.state.DB.GetAccountFollowers(ctx, account.ID)
 	if err != nil && !errors.Is(err, db.ErrNoEntries) {
-		return fmt.Errorf("deleteAccountFollows: db error getting follows targeting account %s: %w", account.ID, err)
+		return gtserror.Newf("db error getting follows targeting account %s: %w", account.ID, err)
 	}
 
 	for _, follow := range followedBy {
 		if err := p.state.DB.DeleteFollowByID(ctx, follow.ID); err != nil {
-			return fmt.Errorf("deleteAccountFollows: db error unfollowing account followedBy: %w", err)
+			return gtserror.Newf("db error unfollowing account followedBy: %w", err)
 		}
 	}
 
 	// Delete follow requests targeting this account.
 	followRequestedBy, err := p.state.DB.GetAccountFollowRequests(ctx, account.ID)
 	if err != nil && !errors.Is(err, db.ErrNoEntries) {
-		return fmt.Errorf("deleteAccountFollows: db error getting follow requests targeting account %s: %w", account.ID, err)
+		return gtserror.Newf("db error getting follow requests targeting account %s: %w", account.ID, err)
 	}
 
 	for _, followRequest := range followRequestedBy {
 		if err := p.state.DB.DeleteFollowRequestByID(ctx, followRequest.ID); err != nil {
-			return fmt.Errorf("deleteAccountFollows: db error unfollowing account followRequestedBy: %w", err)
+			return gtserror.Newf("db error unfollowing account followRequestedBy: %w", err)
 		}
 	}
 
@@ -193,14 +192,14 @@ func (p *Processor) deleteAccountFollows(ctx context.Context, account *gtsmodel.
 	// Delete follows originating from this account.
 	following, err := p.state.DB.GetAccountFollows(ctx, account.ID)
 	if err != nil && !errors.Is(err, db.ErrNoEntries) {
-		return fmt.Errorf("deleteAccountFollows: db error getting follows owned by account %s: %w", account.ID, err)
+		return gtserror.Newf("db error getting follows owned by account %s: %w", account.ID, err)
 	}
 
 	// For each follow owned by this account, unfollow
 	// and process side effects (noop if remote account).
 	for _, follow := range following {
 		if err := p.state.DB.DeleteFollowByID(ctx, follow.ID); err != nil {
-			return fmt.Errorf("deleteAccountFollows: db error unfollowing account: %w", err)
+			return gtserror.Newf("db error unfollowing account: %w", err)
 		}
 		if msg := unfollowSideEffects(ctx, account, follow); msg != nil {
 			// There was a side effect to process.
@@ -211,14 +210,14 @@ func (p *Processor) deleteAccountFollows(ctx context.Context, account *gtsmodel.
 	// Delete follow requests originating from this account.
 	followRequesting, err := p.state.DB.GetAccountFollowRequesting(ctx, account.ID)
 	if err != nil && !errors.Is(err, db.ErrNoEntries) {
-		return fmt.Errorf("deleteAccountFollows: db error getting follow requests owned by account %s: %w", account.ID, err)
+		return gtserror.Newf("db error getting follow requests owned by account %s: %w", account.ID, err)
 	}
 
 	// For each follow owned by this account, unfollow
 	// and process side effects (noop if remote account).
 	for _, followRequest := range followRequesting {
 		if err := p.state.DB.DeleteFollowRequestByID(ctx, followRequest.ID); err != nil {
-			return fmt.Errorf("deleteAccountFollows: db error unfollowingRequesting account: %w", err)
+			return gtserror.Newf("db error unfollowingRequesting account: %w", err)
 		}
 
 		// Dummy out a follow so our side effects func
@@ -279,7 +278,7 @@ func (p *Processor) unfollowSideEffectsFunc(deletedAccount *gtsmodel.Account) fu
 
 func (p *Processor) deleteAccountBlocks(ctx context.Context, account *gtsmodel.Account) error {
 	if err := p.state.DB.DeleteAccountBlocks(ctx, account.ID); err != nil {
-		return fmt.Errorf("deleteAccountBlocks: db error deleting account blocks for %s: %w", account.ID, err)
+		return gtserror.Newf("db error deleting account blocks for %s: %w", account.ID, err)
 	}
 	return nil
 }
@@ -333,7 +332,7 @@ statusLoop:
 			// Look for any boosts of this status in DB.
 			boosts, err := p.state.DB.GetStatusReblogs(ctx, status)
 			if err != nil && !errors.Is(err, db.ErrNoEntries) {
-				return fmt.Errorf("deleteAccountStatuses: error fetching status reblogs for %s: %w", status.ID, err)
+				return gtserror.Newf("error fetching status reblogs for %s: %w", status.ID, err)
 			}
 
 			for _, boost := range boosts {
@@ -347,7 +346,7 @@ statusLoop:
 							log.WithContext(ctx).WithField("boost", boost).Warnf("no account found with id %s for boost %s", boost.AccountID, boost.ID)
 							continue
 						}
-						return fmt.Errorf("deleteAccountStatuses: error fetching boosted status account for %s: %w", boost.AccountID, err)
+						return gtserror.Newf("error fetching boosted status account for %s: %w", boost.AccountID, err)
 					}
 
 					// Set account model
@@ -505,7 +504,7 @@ func stubbifyUser(user *gtsmodel.User) ([]string, error) {
 		return nil, err
 	}
 
-	var never = time.Time{}
+	never := time.Time{}
 
 	user.EncryptedPassword = string(dummyPassword)
 	user.SignUpIP = net.IPv4zero

internal/processing/blocks.go

@@ -19,69 +19,71 @@ package processing
 
 import (
 	"context"
-	"fmt"
+	"errors"
-	"net/url"
 
 	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
-	"github.com/superseriousbusiness/gotosocial/internal/config"
 	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
-	"github.com/superseriousbusiness/gotosocial/internal/oauth"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/log"
+	"github.com/superseriousbusiness/gotosocial/internal/paging"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
 )
 
-func (p *Processor) BlocksGet(ctx context.Context, authed *oauth.Auth, maxID string, sinceID string, limit int) (*apimodel.BlocksResponse, gtserror.WithCode) {
+// BlocksGet ...
-	accounts, nextMaxID, prevMinID, err := p.state.DB.GetAccountBlocks(ctx, authed.Account.ID, maxID, sinceID, limit)
+func (p *Processor) BlocksGet(
-	if err != nil {
+	ctx context.Context,
-		if err == db.ErrNoEntries {
+	requestingAccount *gtsmodel.Account,
-			// there are just no entries
+	page paging.Pager,
-			return &apimodel.BlocksResponse{
+) (*apimodel.PageableResponse, gtserror.WithCode) {
-				Accounts: []*apimodel.Account{},
+	blocks, err := p.state.DB.GetAccountBlocks(ctx,
-			}, nil
+		requestingAccount.ID,
-		}
+		&page,
-		// there's an actual error
+	)
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
 		return nil, gtserror.NewErrorInternalError(err)
 	}
 
-	apiAccounts := []*apimodel.Account{}
+	// Check for zero length.
-	for _, a := range accounts {
+	count := len(blocks)
-		apiAccount, err := p.tc.AccountToAPIAccountBlocked(ctx, a)
+	if len(blocks) == 0 {
-		if err != nil {
+		return util.EmptyPageableResponse(), nil
+	}
+
+	var (
+		items = make([]interface{}, 0, count)
+
+		// Set next + prev values before API converting
+		// so the caller can still page even on error.
+		nextMaxIDValue = blocks[count-1].ID
+		prevMinIDValue = blocks[0].ID
+	)
+
+	for _, block := range blocks {
+		if block.TargetAccount == nil {
+			// All models should be populated at this point.
+			log.Warnf(ctx, "block target account was nil: %v", err)
 			continue
 		}
-		apiAccounts = append(apiAccounts, apiAccount)
-	}
 
-	return p.packageBlocksResponse(apiAccounts, "/api/v1/blocks", nextMaxID, prevMinID, limit)
+		// Convert target account to frontend API model.
-}
+		account, err := p.tc.AccountToAPIAccountBlocked(ctx, block.TargetAccount)
-
+		if err != nil {
-func (p *Processor) packageBlocksResponse(accounts []*apimodel.Account, path string, nextMaxID string, prevMinID string, limit int) (*apimodel.BlocksResponse, gtserror.WithCode) {
+			log.Errorf(ctx, "error converting account to public api account: %v", err)
-	resp := &apimodel.BlocksResponse{
+			continue
-		Accounts: []*apimodel.Account{},
-	}
-	resp.Accounts = accounts
-
-	// prepare the next and previous links
-	if len(accounts) != 0 {
-		protocol := config.GetProtocol()
-		host := config.GetHost()
-
-		nextLink := &url.URL{
-			Scheme:   protocol,
-			Host:     host,
-			Path:     path,
-			RawQuery: fmt.Sprintf("limit=%d&max_id=%s", limit, nextMaxID),
 		}
-		next := fmt.Sprintf("<%s>; rel=\"next\"", nextLink.String())
 
-		prevLink := &url.URL{
+		// Append target to return items.
-			Scheme:   protocol,
+		items = append(items, account)
-			Host:     host,
-			Path:     path,
-			RawQuery: fmt.Sprintf("limit=%d&min_id=%s", limit, prevMinID),
-		}
-		prev := fmt.Sprintf("<%s>; rel=\"prev\"", prevLink.String())
-		resp.LinkHeader = fmt.Sprintf("%s, %s", next, prev)
 	}
 
-	return resp, nil
+	return util.PackagePageableResponse(util.PageableResponseParams{
+		Items:          items,
+		Path:           "/api/v1/blocks",
+		NextMaxIDKey:   "max_id",
+		PrevMinIDKey:   "since_id",
+		NextMaxIDValue: nextMaxIDValue,
+		PrevMinIDValue: prevMinIDValue,
+		Limit:          page.Limit,
+	})
 }

test/envparsing.sh

@@ -25,6 +25,9 @@ EXPECT=$(cat <<"EOF"
             "account-note-ttl": 1800000000000,
             "account-sweep-freq": 1000000000,
             "account-ttl": 10800000000000,
+            "block-ids-max-size": 500,
+            "block-ids-sweep-freq": 60000000000,
+            "block-ids-ttl": 1800000000000,
             "block-max-size": 1000,
             "block-sweep-freq": 60000000000,
             "block-ttl": 1800000000000,
@@ -37,7 +40,13 @@ EXPECT=$(cat <<"EOF"
             "emoji-max-size": 2000,
             "emoji-sweep-freq": 60000000000,
             "emoji-ttl": 1800000000000,
+            "follow-ids-max-size": 500,
+            "follow-ids-sweep-freq": 60000000000,
+            "follow-ids-ttl": 1800000000000,
             "follow-max-size": 2000,
+            "follow-request-ids-max-size": 500,
+            "follow-request-ids-sweep-freq": 60000000000,
+            "follow-request-ids-ttl": 1800000000000,
             "follow-request-max-size": 2000,
             "follow-request-sweep-freq": 60000000000,
             "follow-request-ttl": 1800000000000,

vendor/codeberg.org/gruf/go-cache/v3/ttl/ttl.go

@@ -479,23 +479,23 @@ func (c *Cache[K, V]) InvalidateAll(keys ...K) (ok bool) {
 	kvs = make([]kv[K, V], 0, len(keys))
 
 	c.locked(func() {
-		for _, key := range keys {
+		for x := range keys {
 			var item *Entry[K, V]
 
 			// Check for item in cache
-			item, ok = c.Cache.Get(key)
+			item, ok = c.Cache.Get(keys[x])
 			if !ok {
-				return
+				continue
 			}
 
 			// Append this old value to slice
 			kvs = append(kvs, kv[K, V]{
-				K: key,
+				K: keys[x],
 				V: item.Value,
 			})
 
 			// Remove from cache map
-			_ = c.Cache.Delete(key)
+			_ = c.Cache.Delete(keys[x])
 
 			// Free entry
 			c.free(item)
@@ -553,6 +553,7 @@ func (c *Cache[K, V]) Cap() (l int) {
 	return
 }
 
+// locked performs given function within mutex lock (NOTE: UNLOCK IS NOT DEFERRED).
 func (c *Cache[K, V]) locked(fn func()) {
 	c.Lock()
 	fn()

vendor/modules.txt

@@ -13,7 +13,7 @@ codeberg.org/gruf/go-bytesize
 # codeberg.org/gruf/go-byteutil v1.1.2
 ## explicit; go 1.16
 codeberg.org/gruf/go-byteutil
-# codeberg.org/gruf/go-cache/v3 v3.4.3
+# codeberg.org/gruf/go-cache/v3 v3.4.4
 ## explicit; go 1.19
 codeberg.org/gruf/go-cache/v3
 codeberg.org/gruf/go-cache/v3/result