[performance] refactoring + add fave / follow / request / visibility caching (#1607)

* refactor visibility checking, add caching for visibility

* invalidate visibility cache items on account / status deletes

* fix requester ID passed to visibility cache nil ptr

* de-interface caches, fix home / public timeline caching + visibility

* finish adding code comments for visibility filter

* fix angry goconst linter warnings

* actually finish adding filter visibility code comments for timeline functions

* move home timeline status author check to after visibility

* remove now-unused code

* add more code comments

* add TODO code comment, update printed cache start names

* update printed cache names on stop

* start adding separate follow(request) delete db functions, add specific visibility cache tests

* add relationship type caching

* fix getting local account follows / followed-bys, other small codebase improvements

* simplify invalidation using cache hooks, add more GetAccountBy___() functions

* fix boosting to return 404 if not boostable but no error (to not leak status ID)

* remove dead code

* improved placement of cache invalidation

* update license headers

* add example follow, follow-request config entries

* add example visibility cache configuration to config file

* use specific PutFollowRequest() instead of just Put()

* add tests for all GetAccountBy()

* add GetBlockBy() tests

* update block to check primitive fields

* update and finish adding Get{Account,Block,Follow,FollowRequest}By() tests

* fix copy-pasted code

* update envparsing test

* whitespace

* fix bun struct tag

* add license header to gtscontext

* fix old license header

* improved error creation to not use fmt.Errorf() when not needed

* fix various rebase conflicts, fix account test

* remove commented-out code, fix-up mention caching

* fix mention select bun statement

* ensure mention target account populated, pass in context to customrenderer logging

* remove more uncommented code, fix typeutil test

* add statusfave database model caching

* add status fave cache configuration

* add status fave cache example config

* woops, catch missed error. nice catch linter!

* add back testrig panic on nil db

* update example configuration to match defaults, slight tweak to cache configuration defaults

* update envparsing test with new defaults

* fetch followingget to use the follow target account

* use accounnt.IsLocal() instead of empty domain check

* use constants for the cache visibility type check

* use bun.In() for notification type restriction in db query

* include replies when fetching PublicTimeline() (to account for single-author threads in Visibility{}.StatusPublicTimelineable())

* use bun query building for nested select statements to ensure working with postgres

* update public timeline future status checks to match visibility filter

* same as previous, for home timeline

* update public timeline tests to dynamically check for appropriate statuses

* migrate accounts to allow unique constraint on public_key

* provide minimal account with publicKey

---------

Signed-off-by: kim <grufwub@gmail.com>
Co-authored-by: tsmethurst <tobi.smethurst@protonmail.com>

internal/cache/visibility.go

@@ -0,0 +1,81 @@
+// 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/result"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
+)
+
+type VisibilityCache struct {
+	*result.Cache[*CachedVisibility]
+}
+
+// Init will initialize the visibility cache in this collection.
+// NOTE: the cache MUST NOT be in use anywhere, this is not thread-safe.
+func (c *VisibilityCache) Init() {
+	c.Cache = result.New([]result.Lookup{
+		{Name: "ItemID"},
+		{Name: "RequesterID"},
+		{Name: "Type.RequesterID.ItemID"},
+	}, func(v1 *CachedVisibility) *CachedVisibility {
+		v2 := new(CachedVisibility)
+		*v2 = *v1
+		return v2
+	}, config.GetCacheVisibilityMaxSize())
+	c.Cache.SetTTL(config.GetCacheVisibilityTTL(), true)
+	c.Cache.IgnoreErrors(ignoreErrors)
+}
+
+// Start will attempt to start the visibility cache, or panic.
+func (c *VisibilityCache) Start() {
+	tryStart(c.Cache, config.GetCacheVisibilitySweepFreq())
+}
+
+// Stop will attempt to stop the visibility cache, or panic.
+func (c *VisibilityCache) Stop() {
+	tryStop(c.Cache, config.GetCacheVisibilitySweepFreq())
+}
+
+// VisibilityType represents a visibility lookup type.
+// We use a byte type here to improve performance in the
+// result cache when generating the key.
+type VisibilityType byte
+
+const (
+	// Possible cache visibility lookup types.
+	VisibilityTypeAccount = VisibilityType('a')
+	VisibilityTypeStatus  = VisibilityType('s')
+	VisibilityTypeHome    = VisibilityType('h')
+	VisibilityTypePublic  = VisibilityType('p')
+)
+
+// CachedVisibility represents a cached visibility lookup value.
+type CachedVisibility struct {
+	// ItemID is the ID of the item in question (status / account).
+	ItemID string
+
+	// RequesterID is the ID of the requesting account for this visibility lookup.
+	RequesterID string
+
+	// Type is the visibility lookup type.
+	Type VisibilityType
+
+	// Value is the actual visibility value.
+	Value bool
+}