[feature] support configuring database caches (#1246)

* update config generator to support nested structs, add cache configuration options

* update envparsing test

* add cache configuration to config parse tests

* set cache configuration in testrig

* move caches to sub-cache "gts" namespace, update envparsing, add cache config docs to example config

Signed-off-by: kim <grufwub@gmail.com>

internal/config/defaults.go

@@ -18,7 +18,12 @@
 
 package config
 
-import "github.com/coreos/go-oidc/v3/oidc"
+import (
+	"time"
+
+	"codeberg.org/gruf/go-bytesize"
+	"github.com/coreos/go-oidc/v3/oidc"
+)
 
 // Defaults contains a populated Configuration with reasonable defaults. Note that
 // if you use this, you will still need to set Host, and, if desired, ConfigPath.
@@ -56,13 +61,13 @@ var Defaults = Configuration{
 	AccountsReasonRequired:   true,
 	AccountsAllowCustomCSS:   false,
 
-	MediaImageMaxSize:        10485760, // 10mb
-	MediaVideoMaxSize:        41943040, // 40mb
+	MediaImageMaxSize:        10 * bytesize.MiB,
+	MediaVideoMaxSize:        40 * bytesize.MiB,
 	MediaDescriptionMinChars: 0,
 	MediaDescriptionMaxChars: 500,
 	MediaRemoteCacheDays:     30,
-	MediaEmojiLocalMaxSize:   51200,  // 50kb
-	MediaEmojiRemoteMaxSize:  102400, // 100kb
+	MediaEmojiLocalMaxSize:   50 * bytesize.KiB,
+	MediaEmojiRemoteMaxSize:  100 * bytesize.KiB,
 
 	StorageBackend:       "local",
 	StorageLocalBasePath: "/gotosocial/storage",
@@ -101,4 +106,48 @@ var Defaults = Configuration{
 
 	AdvancedCookiesSamesite:   "lax",
 	AdvancedRateLimitRequests: 1000, // per 5 minutes
+
+	Cache: CacheConfiguration{
+		GTS: GTSCacheConfiguration{
+			AccountMaxSize:   100,
+			AccountTTL:       time.Minute * 5,
+			AccountSweepFreq: time.Second * 10,
+
+			BlockMaxSize:   100,
+			BlockTTL:       time.Minute * 5,
+			BlockSweepFreq: time.Second * 10,
+
+			DomainBlockMaxSize:   1000,
+			DomainBlockTTL:       time.Hour * 24,
+			DomainBlockSweepFreq: time.Minute,
+
+			EmojiMaxSize:   500,
+			EmojiTTL:       time.Minute * 5,
+			EmojiSweepFreq: time.Second * 10,
+
+			EmojiCategoryMaxSize:   100,
+			EmojiCategoryTTL:       time.Minute * 5,
+			EmojiCategorySweepFreq: time.Second * 10,
+
+			MentionMaxSize:   500,
+			MentionTTL:       time.Minute * 5,
+			MentionSweepFreq: time.Second * 10,
+
+			NotificationMaxSize:   500,
+			NotificationTTL:       time.Minute * 5,
+			NotificationSweepFreq: time.Second * 10,
+
+			StatusMaxSize:   500,
+			StatusTTL:       time.Minute * 5,
+			StatusSweepFreq: time.Second * 10,
+
+			TombstoneMaxSize:   100,
+			TombstoneTTL:       time.Minute * 5,
+			TombstoneSweepFreq: time.Second * 10,
+
+			UserMaxSize:   100,
+			UserTTL:       time.Minute * 5,
+			UserSweepFreq: time.Second * 10,
+		},
+	},
 }