feat(cache): redis cache (#8822)

# Which Problems Are Solved

Add a cache implementation using Redis single mode. This does not add
support for Redis Cluster or sentinel.

# How the Problems Are Solved

Added the `internal/cache/redis` package. All operations occur
atomically, including setting of secondary indexes, using LUA scripts
where needed.

The [`miniredis`](https://github.com/alicebob/miniredis) package is used
to run unit tests.

# Additional Changes

- Move connector code to `internal/cache/connector/...` and remove
duplicate code from `query` and `command` packages.
- Fix a missed invalidation on the restrictions projection

# Additional Context

Closes #8130

internal/cache/cache.go

@@ -6,8 +6,16 @@ import (
 	"time"
 
 	"github.com/zitadel/logging"
+)
 
-	"github.com/zitadel/zitadel/internal/database/postgres"
+// Purpose describes which object types are stored by a cache.
+type Purpose int
+
+//go:generate enumer -type Purpose -transform snake -trimprefix Purpose
+const (
+	PurposeUnspecified Purpose = iota
+	PurposeAuthzInstance
+	PurposeMilestones
 )
 
 // Cache stores objects with a value of type `V`.
@@ -72,18 +80,19 @@ type Entry[I, K comparable] interface {
 	Keys(index I) (key []K)
 }
 
-type CachesConfig struct {
-	Connectors struct {
-		Memory   MemoryConnectorConfig
-		Postgres PostgresConnectorConfig
-		// Redis redis.Config?
-	}
-	Instance   *CacheConfig
-	Milestones *CacheConfig
-}
+type Connector int
 
-type CacheConfig struct {
-	Connector string
+//go:generate enumer -type Connector -transform snake -trimprefix Connector -linecomment -text
+const (
+	// Empty line comment ensures empty string for unspecified value
+	ConnectorUnspecified Connector = iota //
+	ConnectorMemory
+	ConnectorPostgres
+	ConnectorRedis
+)
+
+type Config struct {
+	Connector Connector
 
 	// Age since an object was added to the cache,
 	// after which the object is considered invalid.
@@ -99,14 +108,3 @@ type CacheConfig struct {
 	// By default only errors are logged to stdout.
 	Log *logging.Config
 }
-
-type MemoryConnectorConfig struct {
-	Enabled   bool
-	AutoPrune AutoPruneConfig
-}
-
-type PostgresConnectorConfig struct {
-	Enabled    bool
-	AutoPrune  AutoPruneConfig
-	Connection postgres.Config
-}

internal/cache/connector/connector.go

@@ -0,0 +1,69 @@
+// Package connector provides glue between the [cache.Cache] interface and implementations from the connector sub-packages.
+package connector
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/zitadel/zitadel/internal/cache"
+	"github.com/zitadel/zitadel/internal/cache/connector/gomap"
+	"github.com/zitadel/zitadel/internal/cache/connector/noop"
+	"github.com/zitadel/zitadel/internal/cache/connector/pg"
+	"github.com/zitadel/zitadel/internal/cache/connector/redis"
+	"github.com/zitadel/zitadel/internal/database"
+)
+
+type CachesConfig struct {
+	Connectors struct {
+		Memory   gomap.Config
+		Postgres pg.Config
+		Redis    redis.Config
+	}
+	Instance   *cache.Config
+	Milestones *cache.Config
+}
+
+type Connectors struct {
+	Config   CachesConfig
+	Memory   *gomap.Connector
+	Postgres *pg.Connector
+	Redis    *redis.Connector
+}
+
+func StartConnectors(conf *CachesConfig, client *database.DB) (Connectors, error) {
+	if conf == nil {
+		return Connectors{}, nil
+	}
+	return Connectors{
+		Config:   *conf,
+		Memory:   gomap.NewConnector(conf.Connectors.Memory),
+		Postgres: pg.NewConnector(conf.Connectors.Postgres, client),
+		Redis:    redis.NewConnector(conf.Connectors.Redis),
+	}, nil
+}
+
+func StartCache[I ~int, K ~string, V cache.Entry[I, K]](background context.Context, indices []I, purpose cache.Purpose, conf *cache.Config, connectors Connectors) (cache.Cache[I, K, V], error) {
+	if conf == nil || conf.Connector == cache.ConnectorUnspecified {
+		return noop.NewCache[I, K, V](), nil
+	}
+	if conf.Connector == cache.ConnectorMemory && connectors.Memory != nil {
+		c := gomap.NewCache[I, K, V](background, indices, *conf)
+		connectors.Memory.Config.StartAutoPrune(background, c, purpose)
+		return c, nil
+	}
+	if conf.Connector == cache.ConnectorPostgres && connectors.Postgres != nil {
+		c, err := pg.NewCache[I, K, V](background, purpose, *conf, indices, connectors.Postgres)
+		if err != nil {
+			return nil, fmt.Errorf("start cache: %w", err)
+		}
+		connectors.Postgres.Config.AutoPrune.StartAutoPrune(background, c, purpose)
+		return c, nil
+	}
+	if conf.Connector == cache.ConnectorRedis && connectors.Redis != nil {
+		db := connectors.Redis.Config.DBOffset + int(purpose)
+		c := redis.NewCache[I, K, V](*conf, connectors.Redis, db, indices)
+		return c, nil
+	}
+
+	return nil, fmt.Errorf("cache connector %q not enabled", conf.Connector)
+}

internal/cache/connector/gomap/connector.go

@@ -0,0 +1,23 @@
+package gomap
+
+import (
+	"github.com/zitadel/zitadel/internal/cache"
+)
+
+type Config struct {
+	Enabled   bool
+	AutoPrune cache.AutoPruneConfig
+}
+
+type Connector struct {
+	Config cache.AutoPruneConfig
+}
+
+func NewConnector(config Config) *Connector {
+	if !config.Enabled {
+		return nil
+	}
+	return &Connector{
+		Config: config.AutoPrune,
+	}
+}

internal/cache/connector/gomap/gomap.go

@@ -14,14 +14,14 @@ import (
 )
 
 type mapCache[I, K comparable, V cache.Entry[I, K]] struct {
-	config   *cache.CacheConfig
+	config   *cache.Config
 	indexMap map[I]*index[K, V]
 	logger   *slog.Logger
 }
 
 // NewCache returns an in-memory Cache implementation based on the builtin go map type.
 // Object values are stored as-is and there is no encoding or decoding involved.
-func NewCache[I, K comparable, V cache.Entry[I, K]](background context.Context, indices []I, config cache.CacheConfig) cache.PrunerCache[I, K, V] {
+func NewCache[I, K comparable, V cache.Entry[I, K]](background context.Context, indices []I, config cache.Config) cache.PrunerCache[I, K, V] {
 	m := &mapCache[I, K, V]{
 		config:   &config,
 		indexMap: make(map[I]*index[K, V], len(indices)),
@@ -116,7 +116,7 @@ func (c *mapCache[I, K, V]) Truncate(ctx context.Context) error {
 
 type index[K comparable, V any] struct {
 	mutex   sync.RWMutex
-	config  *cache.CacheConfig
+	config  *cache.Config
 	entries map[K]*entry[V]
 }
 
@@ -177,7 +177,7 @@ type entry[V any] struct {
 	lastUse atomic.Int64 // UnixMicro time
 }
 
-func (e *entry[V]) isValid(c *cache.CacheConfig) bool {
+func (e *entry[V]) isValid(c *cache.Config) bool {
 	if e.invalid.Load() {
 		return false
 	}

internal/cache/connector/gomap/gomap_test.go

@@ -41,7 +41,7 @@ func (o *testObject) Keys(index testIndex) []string {
 }
 
 func Test_mapCache_Get(t *testing.T) {
-	c := NewCache[testIndex, string, *testObject](context.Background(), testIndices, cache.CacheConfig{
+	c := NewCache[testIndex, string, *testObject](context.Background(), testIndices, cache.Config{
 		MaxAge:     time.Second,
 		LastUseAge: time.Second / 4,
 		Log: &logging.Config{
@@ -103,7 +103,7 @@ func Test_mapCache_Get(t *testing.T) {
 }
 
 func Test_mapCache_Invalidate(t *testing.T) {
-	c := NewCache[testIndex, string, *testObject](context.Background(), testIndices, cache.CacheConfig{
+	c := NewCache[testIndex, string, *testObject](context.Background(), testIndices, cache.Config{
 		MaxAge:     time.Second,
 		LastUseAge: time.Second / 4,
 		Log: &logging.Config{
@@ -124,7 +124,7 @@ func Test_mapCache_Invalidate(t *testing.T) {
 }
 
 func Test_mapCache_Delete(t *testing.T) {
-	c := NewCache[testIndex, string, *testObject](context.Background(), testIndices, cache.CacheConfig{
+	c := NewCache[testIndex, string, *testObject](context.Background(), testIndices, cache.Config{
 		MaxAge:     time.Second,
 		LastUseAge: time.Second / 4,
 		Log: &logging.Config{
@@ -157,7 +157,7 @@ func Test_mapCache_Delete(t *testing.T) {
 }
 
 func Test_mapCache_Prune(t *testing.T) {
-	c := NewCache[testIndex, string, *testObject](context.Background(), testIndices, cache.CacheConfig{
+	c := NewCache[testIndex, string, *testObject](context.Background(), testIndices, cache.Config{
 		MaxAge:     time.Second,
 		LastUseAge: time.Second / 4,
 		Log: &logging.Config{
@@ -193,7 +193,7 @@ func Test_mapCache_Prune(t *testing.T) {
 }
 
 func Test_mapCache_Truncate(t *testing.T) {
-	c := NewCache[testIndex, string, *testObject](context.Background(), testIndices, cache.CacheConfig{
+	c := NewCache[testIndex, string, *testObject](context.Background(), testIndices, cache.Config{
 		MaxAge:     time.Second,
 		LastUseAge: time.Second / 4,
 		Log: &logging.Config{
@@ -235,7 +235,7 @@ func Test_entry_isValid(t *testing.T) {
 	tests := []struct {
 		name   string
 		fields fields
-		config *cache.CacheConfig
+		config *cache.Config
 		want   bool
 	}{
 		{
@@ -245,7 +245,7 @@ func Test_entry_isValid(t *testing.T) {
 				invalid: true,
 				lastUse: time.Now(),
 			},
-			config: &cache.CacheConfig{
+			config: &cache.Config{
 				MaxAge:     time.Minute,
 				LastUseAge: time.Second,
 			},
@@ -258,7 +258,7 @@ func Test_entry_isValid(t *testing.T) {
 				invalid: false,
 				lastUse: time.Now(),
 			},
-			config: &cache.CacheConfig{
+			config: &cache.Config{
 				MaxAge:     time.Minute,
 				LastUseAge: time.Second,
 			},
@@ -271,7 +271,7 @@ func Test_entry_isValid(t *testing.T) {
 				invalid: false,
 				lastUse: time.Now(),
 			},
-			config: &cache.CacheConfig{
+			config: &cache.Config{
 				LastUseAge: time.Second,
 			},
 			want: true,
@@ -283,7 +283,7 @@ func Test_entry_isValid(t *testing.T) {
 				invalid: false,
 				lastUse: time.Now().Add(-(time.Second * 2)),
 			},
-			config: &cache.CacheConfig{
+			config: &cache.Config{
 				MaxAge:     time.Minute,
 				LastUseAge: time.Second,
 			},
@@ -296,7 +296,7 @@ func Test_entry_isValid(t *testing.T) {
 				invalid: false,
 				lastUse: time.Now().Add(-(time.Second * 2)),
 			},
-			config: &cache.CacheConfig{
+			config: &cache.Config{
 				MaxAge: time.Minute,
 			},
 			want: true,
@@ -308,7 +308,7 @@ func Test_entry_isValid(t *testing.T) {
 				invalid: false,
 				lastUse: time.Now(),
 			},
-			config: &cache.CacheConfig{
+			config: &cache.Config{
 				MaxAge:     time.Minute,
 				LastUseAge: time.Second,
 			},

internal/cache/connector/pg/connector.go

@@ -0,0 +1,28 @@
+package pg
+
+import (
+	"github.com/zitadel/zitadel/internal/cache"
+	"github.com/zitadel/zitadel/internal/database"
+)
+
+type Config struct {
+	Enabled   bool
+	AutoPrune cache.AutoPruneConfig
+}
+
+type Connector struct {
+	PGXPool
+	Dialect string
+	Config  Config
+}
+
+func NewConnector(config Config, client *database.DB) *Connector {
+	if !config.Enabled {
+		return nil
+	}
+	return &Connector{
+		PGXPool: client.Pool,
+		Dialect: client.Type(),
+		Config:  config,
+	}
+}

internal/cache/connector/pg/pg.go

@@ -40,25 +40,25 @@ type PGXPool interface {
 }
 
 type pgCache[I ~int, K ~string, V cache.Entry[I, K]] struct {
-	name    string
-	config  *cache.CacheConfig
-	indices []I
-	pool    PGXPool
-	logger  *slog.Logger
+	purpose   cache.Purpose
+	config    *cache.Config
+	indices   []I
+	connector *Connector
+	logger    *slog.Logger
 }
 
 // NewCache returns a cache that stores and retrieves objects using PostgreSQL unlogged tables.
-func NewCache[I ~int, K ~string, V cache.Entry[I, K]](ctx context.Context, name string, config cache.CacheConfig, indices []I, pool PGXPool, dialect string) (cache.PrunerCache[I, K, V], error) {
+func NewCache[I ~int, K ~string, V cache.Entry[I, K]](ctx context.Context, purpose cache.Purpose, config cache.Config, indices []I, connector *Connector) (cache.PrunerCache[I, K, V], error) {
 	c := &pgCache[I, K, V]{
-		name:    name,
-		config:  &config,
-		indices: indices,
-		pool:    pool,
-		logger:  config.Log.Slog().With("cache_name", name),
+		purpose:   purpose,
+		config:    &config,
+		indices:   indices,
+		connector: connector,
+		logger:    config.Log.Slog().With("cache_purpose", purpose),
 	}
 	c.logger.InfoContext(ctx, "pg cache logging enabled")
 
-	if dialect == "postgres" {
+	if connector.Dialect == "postgres" {
 		if err := c.createPartition(ctx); err != nil {
 			return nil, err
 		}
@@ -68,10 +68,10 @@ func NewCache[I ~int, K ~string, V cache.Entry[I, K]](ctx context.Context, name
 
 func (c *pgCache[I, K, V]) createPartition(ctx context.Context) error {
 	var query strings.Builder
-	if err := createPartitionTmpl.Execute(&query, c.name); err != nil {
+	if err := createPartitionTmpl.Execute(&query, c.purpose.String()); err != nil {
 		return err
 	}
-	_, err := c.pool.Exec(ctx, query.String())
+	_, err := c.connector.Exec(ctx, query.String())
 	return err
 }
 
@@ -87,7 +87,7 @@ func (c *pgCache[I, K, V]) set(ctx context.Context, entry V) (err error) {
 	keys := c.indexKeysFromEntry(entry)
 	c.logger.DebugContext(ctx, "pg cache set", "index_key", keys)
 
-	_, err = c.pool.Exec(ctx, setQuery, c.name, keys, entry)
+	_, err = c.connector.Exec(ctx, setQuery, c.purpose.String(), keys, entry)
 	if err != nil {
 		c.logger.ErrorContext(ctx, "pg cache set", "err", err)
 		return err
@@ -117,7 +117,7 @@ func (c *pgCache[I, K, V]) get(ctx context.Context, index I, key K) (value V, er
 	if !slices.Contains(c.indices, index) {
 		return value, cache.NewIndexUnknownErr(index)
 	}
-	err = c.pool.QueryRow(ctx, getQuery, c.name, index, key, c.config.MaxAge, c.config.LastUseAge).Scan(&value)
+	err = c.connector.QueryRow(ctx, getQuery, c.purpose.String(), index, key, c.config.MaxAge, c.config.LastUseAge).Scan(&value)
 	return value, err
 }
 
@@ -125,7 +125,7 @@ func (c *pgCache[I, K, V]) Invalidate(ctx context.Context, index I, keys ...K) (
 	ctx, span := tracing.NewSpan(ctx)
 	defer func() { span.EndWithError(err) }()
 
-	_, err = c.pool.Exec(ctx, invalidateQuery, c.name, index, keys)
+	_, err = c.connector.Exec(ctx, invalidateQuery, c.purpose.String(), index, keys)
 	c.logger.DebugContext(ctx, "pg cache invalidate", "index", index, "keys", keys)
 	return err
 }
@@ -134,7 +134,7 @@ func (c *pgCache[I, K, V]) Delete(ctx context.Context, index I, keys ...K) (err
 	ctx, span := tracing.NewSpan(ctx)
 	defer func() { span.EndWithError(err) }()
 
-	_, err = c.pool.Exec(ctx, deleteQuery, c.name, index, keys)
+	_, err = c.connector.Exec(ctx, deleteQuery, c.purpose.String(), index, keys)
 	c.logger.DebugContext(ctx, "pg cache delete", "index", index, "keys", keys)
 	return err
 }
@@ -143,7 +143,7 @@ func (c *pgCache[I, K, V]) Prune(ctx context.Context) (err error) {
 	ctx, span := tracing.NewSpan(ctx)
 	defer func() { span.EndWithError(err) }()
 
-	_, err = c.pool.Exec(ctx, pruneQuery, c.name, c.config.MaxAge, c.config.LastUseAge)
+	_, err = c.connector.Exec(ctx, pruneQuery, c.purpose.String(), c.config.MaxAge, c.config.LastUseAge)
 	c.logger.DebugContext(ctx, "pg cache prune")
 	return err
 }
@@ -152,7 +152,7 @@ func (c *pgCache[I, K, V]) Truncate(ctx context.Context) (err error) {
 	ctx, span := tracing.NewSpan(ctx)
 	defer func() { span.EndWithError(err) }()
 
-	_, err = c.pool.Exec(ctx, truncateQuery, c.name)
+	_, err = c.connector.Exec(ctx, truncateQuery, c.purpose.String())
 	c.logger.DebugContext(ctx, "pg cache truncate")
 	return err
 }

internal/cache/connector/pg/pg_test.go

@@ -67,7 +67,7 @@ func TestNewCache(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			conf := cache.CacheConfig{
+			conf := cache.Config{
 				Log: &logging.Config{
 					Level:     "debug",
 					AddSource: true,
@@ -76,8 +76,12 @@ func TestNewCache(t *testing.T) {
 			pool, err := pgxmock.NewPool()
 			require.NoError(t, err)
 			tt.expect(pool)
+			connector := &Connector{
+				PGXPool: pool,
+				Dialect: "postgres",
+			}
 
-			c, err := NewCache[testIndex, string, *testObject](context.Background(), cacheName, conf, testIndices, pool, "postgres")
+			c, err := NewCache[testIndex, string, *testObject](context.Background(), cachePurpose, conf, testIndices, connector)
 			require.ErrorIs(t, err, tt.wantErr)
 			if tt.wantErr == nil {
 				assert.NotNil(t, c)
@@ -111,7 +115,7 @@ func Test_pgCache_Set(t *testing.T) {
 			},
 			expect: func(ppi pgxmock.PgxCommonIface) {
 				ppi.ExpectExec(queryExpect).
-					WithArgs("test",
+					WithArgs(cachePurpose.String(),
 						[]indexKey[testIndex, string]{
 							{IndexID: testIndexID, IndexKey: "id1"},
 							{IndexID: testIndexName, IndexKey: "foo"},
@@ -135,7 +139,7 @@ func Test_pgCache_Set(t *testing.T) {
 			},
 			expect: func(ppi pgxmock.PgxCommonIface) {
 				ppi.ExpectExec(queryExpect).
-					WithArgs("test",
+					WithArgs(cachePurpose.String(),
 						[]indexKey[testIndex, string]{
 							{IndexID: testIndexID, IndexKey: "id1"},
 							{IndexID: testIndexName, IndexKey: "foo"},
@@ -151,7 +155,7 @@ func Test_pgCache_Set(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			c, pool := prepareCache(t, cache.CacheConfig{})
+			c, pool := prepareCache(t, cache.Config{})
 			defer pool.Close()
 			tt.expect(pool)
 
@@ -173,7 +177,7 @@ func Test_pgCache_Get(t *testing.T) {
 	}
 	tests := []struct {
 		name   string
-		config cache.CacheConfig
+		config cache.Config
 		args   args
 		expect func(pgxmock.PgxCommonIface)
 		want   *testObject
@@ -181,7 +185,7 @@ func Test_pgCache_Get(t *testing.T) {
 	}{
 		{
 			name: "invalid index",
-			config: cache.CacheConfig{
+			config: cache.Config{
 				MaxAge:     time.Minute,
 				LastUseAge: time.Second,
 			},
@@ -194,7 +198,7 @@ func Test_pgCache_Get(t *testing.T) {
 		},
 		{
 			name: "no rows",
-			config: cache.CacheConfig{
+			config: cache.Config{
 				MaxAge:     0,
 				LastUseAge: 0,
 			},
@@ -204,14 +208,14 @@ func Test_pgCache_Get(t *testing.T) {
 			},
 			expect: func(pci pgxmock.PgxCommonIface) {
 				pci.ExpectQuery(queryExpect).
-					WithArgs("test", testIndexID, "id1", time.Duration(0), time.Duration(0)).
+					WithArgs(cachePurpose.String(), testIndexID, "id1", time.Duration(0), time.Duration(0)).
 					WillReturnRows(pgxmock.NewRows([]string{"payload"}))
 			},
 			wantOk: false,
 		},
 		{
 			name: "error",
-			config: cache.CacheConfig{
+			config: cache.Config{
 				MaxAge:     0,
 				LastUseAge: 0,
 			},
@@ -221,14 +225,14 @@ func Test_pgCache_Get(t *testing.T) {
 			},
 			expect: func(pci pgxmock.PgxCommonIface) {
 				pci.ExpectQuery(queryExpect).
-					WithArgs("test", testIndexID, "id1", time.Duration(0), time.Duration(0)).
+					WithArgs(cachePurpose.String(), testIndexID, "id1", time.Duration(0), time.Duration(0)).
 					WillReturnError(pgx.ErrTxClosed)
 			},
 			wantOk: false,
 		},
 		{
 			name: "ok",
-			config: cache.CacheConfig{
+			config: cache.Config{
 				MaxAge:     time.Minute,
 				LastUseAge: time.Second,
 			},
@@ -238,7 +242,7 @@ func Test_pgCache_Get(t *testing.T) {
 			},
 			expect: func(pci pgxmock.PgxCommonIface) {
 				pci.ExpectQuery(queryExpect).
-					WithArgs("test", testIndexID, "id1", time.Minute, time.Second).
+					WithArgs(cachePurpose.String(), testIndexID, "id1", time.Minute, time.Second).
 					WillReturnRows(
 						pgxmock.NewRows([]string{"payload"}).AddRow(&testObject{
 							ID:   "id1",
@@ -276,14 +280,14 @@ func Test_pgCache_Invalidate(t *testing.T) {
 	}
 	tests := []struct {
 		name    string
-		config  cache.CacheConfig
+		config  cache.Config
 		args    args
 		expect  func(pgxmock.PgxCommonIface)
 		wantErr error
 	}{
 		{
 			name: "error",
-			config: cache.CacheConfig{
+			config: cache.Config{
 				MaxAge:     0,
 				LastUseAge: 0,
 			},
@@ -293,14 +297,14 @@ func Test_pgCache_Invalidate(t *testing.T) {
 			},
 			expect: func(pci pgxmock.PgxCommonIface) {
 				pci.ExpectExec(queryExpect).
-					WithArgs("test", testIndexID, []string{"id1", "id2"}).
+					WithArgs(cachePurpose.String(), testIndexID, []string{"id1", "id2"}).
 					WillReturnError(pgx.ErrTxClosed)
 			},
 			wantErr: pgx.ErrTxClosed,
 		},
 		{
 			name: "ok",
-			config: cache.CacheConfig{
+			config: cache.Config{
 				MaxAge:     time.Minute,
 				LastUseAge: time.Second,
 			},
@@ -310,7 +314,7 @@ func Test_pgCache_Invalidate(t *testing.T) {
 			},
 			expect: func(pci pgxmock.PgxCommonIface) {
 				pci.ExpectExec(queryExpect).
-					WithArgs("test", testIndexID, []string{"id1", "id2"}).
+					WithArgs(cachePurpose.String(), testIndexID, []string{"id1", "id2"}).
 					WillReturnResult(pgxmock.NewResult("DELETE", 1))
 			},
 		},
@@ -338,14 +342,14 @@ func Test_pgCache_Delete(t *testing.T) {
 	}
 	tests := []struct {
 		name    string
-		config  cache.CacheConfig
+		config  cache.Config
 		args    args
 		expect  func(pgxmock.PgxCommonIface)
 		wantErr error
 	}{
 		{
 			name: "error",
-			config: cache.CacheConfig{
+			config: cache.Config{
 				MaxAge:     0,
 				LastUseAge: 0,
 			},
@@ -355,14 +359,14 @@ func Test_pgCache_Delete(t *testing.T) {
 			},
 			expect: func(pci pgxmock.PgxCommonIface) {
 				pci.ExpectExec(queryExpect).
-					WithArgs("test", testIndexID, []string{"id1", "id2"}).
+					WithArgs(cachePurpose.String(), testIndexID, []string{"id1", "id2"}).
 					WillReturnError(pgx.ErrTxClosed)
 			},
 			wantErr: pgx.ErrTxClosed,
 		},
 		{
 			name: "ok",
-			config: cache.CacheConfig{
+			config: cache.Config{
 				MaxAge:     time.Minute,
 				LastUseAge: time.Second,
 			},
@@ -372,7 +376,7 @@ func Test_pgCache_Delete(t *testing.T) {
 			},
 			expect: func(pci pgxmock.PgxCommonIface) {
 				pci.ExpectExec(queryExpect).
-					WithArgs("test", testIndexID, []string{"id1", "id2"}).
+					WithArgs(cachePurpose.String(), testIndexID, []string{"id1", "id2"}).
 					WillReturnResult(pgxmock.NewResult("DELETE", 1))
 			},
 		},
@@ -396,32 +400,32 @@ func Test_pgCache_Prune(t *testing.T) {
 	queryExpect := regexp.QuoteMeta(pruneQuery)
 	tests := []struct {
 		name    string
-		config  cache.CacheConfig
+		config  cache.Config
 		expect  func(pgxmock.PgxCommonIface)
 		wantErr error
 	}{
 		{
 			name: "error",
-			config: cache.CacheConfig{
+			config: cache.Config{
 				MaxAge:     0,
 				LastUseAge: 0,
 			},
 			expect: func(pci pgxmock.PgxCommonIface) {
 				pci.ExpectExec(queryExpect).
-					WithArgs("test", time.Duration(0), time.Duration(0)).
+					WithArgs(cachePurpose.String(), time.Duration(0), time.Duration(0)).
 					WillReturnError(pgx.ErrTxClosed)
 			},
 			wantErr: pgx.ErrTxClosed,
 		},
 		{
 			name: "ok",
-			config: cache.CacheConfig{
+			config: cache.Config{
 				MaxAge:     time.Minute,
 				LastUseAge: time.Second,
 			},
 			expect: func(pci pgxmock.PgxCommonIface) {
 				pci.ExpectExec(queryExpect).
-					WithArgs("test", time.Minute, time.Second).
+					WithArgs(cachePurpose.String(), time.Minute, time.Second).
 					WillReturnResult(pgxmock.NewResult("DELETE", 1))
 			},
 		},
@@ -445,32 +449,32 @@ func Test_pgCache_Truncate(t *testing.T) {
 	queryExpect := regexp.QuoteMeta(truncateQuery)
 	tests := []struct {
 		name    string
-		config  cache.CacheConfig
+		config  cache.Config
 		expect  func(pgxmock.PgxCommonIface)
 		wantErr error
 	}{
 		{
 			name: "error",
-			config: cache.CacheConfig{
+			config: cache.Config{
 				MaxAge:     0,
 				LastUseAge: 0,
 			},
 			expect: func(pci pgxmock.PgxCommonIface) {
 				pci.ExpectExec(queryExpect).
-					WithArgs("test").
+					WithArgs(cachePurpose.String()).
 					WillReturnError(pgx.ErrTxClosed)
 			},
 			wantErr: pgx.ErrTxClosed,
 		},
 		{
 			name: "ok",
-			config: cache.CacheConfig{
+			config: cache.Config{
 				MaxAge:     time.Minute,
 				LastUseAge: time.Second,
 			},
 			expect: func(pci pgxmock.PgxCommonIface) {
 				pci.ExpectExec(queryExpect).
-					WithArgs("test").
+					WithArgs(cachePurpose.String()).
 					WillReturnResult(pgxmock.NewResult("DELETE", 1))
 			},
 		},
@@ -491,18 +495,18 @@ func Test_pgCache_Truncate(t *testing.T) {
 }
 
 const (
-	cacheName                    = "test"
-	expectedCreatePartitionQuery = `create unlogged table if not exists cache.objects_test
+	cachePurpose                 = cache.PurposeAuthzInstance
+	expectedCreatePartitionQuery = `create unlogged table if not exists cache.objects_authz_instance
 partition of cache.objects
-for values in ('test');
+for values in ('authz_instance');
 
-create unlogged table if not exists cache.string_keys_test
+create unlogged table if not exists cache.string_keys_authz_instance
 partition of cache.string_keys
-for values in ('test');
+for values in ('authz_instance');
 `
 )
 
-func prepareCache(t *testing.T, conf cache.CacheConfig) (cache.PrunerCache[testIndex, string, *testObject], pgxmock.PgxPoolIface) {
+func prepareCache(t *testing.T, conf cache.Config) (cache.PrunerCache[testIndex, string, *testObject], pgxmock.PgxPoolIface) {
 	conf.Log = &logging.Config{
 		Level:     "debug",
 		AddSource: true,
@@ -512,8 +516,11 @@ func prepareCache(t *testing.T, conf cache.CacheConfig) (cache.PrunerCache[testI
 
 	pool.ExpectExec(regexp.QuoteMeta(expectedCreatePartitionQuery)).
 		WillReturnResult(pgxmock.NewResult("CREATE TABLE", 0))
-
-	c, err := NewCache[testIndex, string, *testObject](context.Background(), cacheName, conf, testIndices, pool, "postgres")
+	connector := &Connector{
+		PGXPool: pool,
+		Dialect: "postgres",
+	}
+	c, err := NewCache[testIndex, string, *testObject](context.Background(), cachePurpose, conf, testIndices, connector)
 	require.NoError(t, err)
 	return c, pool
 }

internal/cache/connector/redis/_remove.lua

@@ -0,0 +1,10 @@
+local function remove(object_id)
+    local setKey = keySetKey(object_id)
+    local keys = redis.call("SMEMBERS", setKey)
+    local n = #keys
+    for i = 1, n do
+        redis.call("DEL", keys[i])
+    end
+    redis.call("DEL", setKey)
+    redis.call("DEL", object_id)
+end

internal/cache/connector/redis/_select.lua

@@ -0,0 +1,3 @@
+-- SELECT ensures the DB namespace for each script.
+-- When used, it consumes the first ARGV entry.
+redis.call("SELECT", ARGV[1])

internal/cache/connector/redis/_util.lua

@@ -0,0 +1,17 @@
+-- keySetKey returns the redis key of the set containing all keys to the object.
+local function keySetKey (object_id)
+    return object_id .. "-keys"
+end
+
+local function getTime()
+    return tonumber(redis.call('TIME')[1])
+end
+
+-- getCall wrapts redis.call so a nil is returned instead of false.
+local function getCall (...)
+    local result = redis.call(...)
+    if result == false then
+        return nil
+    end
+    return result 
+end

internal/cache/connector/redis/connector.go

@@ -0,0 +1,154 @@
+package redis
+
+import (
+	"crypto/tls"
+	"time"
+
+	"github.com/redis/go-redis/v9"
+)
+
+type Config struct {
+	Enabled bool
+
+	// The network type, either tcp or unix.
+	// Default is tcp.
+	Network string
+	// host:port address.
+	Addr string
+	// ClientName will execute the `CLIENT SETNAME ClientName` command for each conn.
+	ClientName string
+	// Use the specified Username to authenticate the current connection
+	// with one of the connections defined in the ACL list when connecting
+	// to a Redis 6.0 instance, or greater, that is using the Redis ACL system.
+	Username string
+	// Optional password. Must match the password specified in the
+	// requirepass server configuration option (if connecting to a Redis 5.0 instance, or lower),
+	// or the User Password when connecting to a Redis 6.0 instance, or greater,
+	// that is using the Redis ACL system.
+	Password string
+	// Each ZITADEL cache uses an incremental DB namespace.
+	// This option offsets the first DB so it doesn't conflict with other databases on the same server.
+	// Note that ZITADEL uses FLUSHDB command to truncate a cache.
+	// This can have destructive consequences when overlapping DB namespaces are used.
+	DBOffset int
+
+	// Maximum number of retries before giving up.
+	// Default is 3 retries; -1 (not 0) disables retries.
+	MaxRetries int
+	// Minimum backoff between each retry.
+	// Default is 8 milliseconds; -1 disables backoff.
+	MinRetryBackoff time.Duration
+	// Maximum backoff between each retry.
+	// Default is 512 milliseconds; -1 disables backoff.
+	MaxRetryBackoff time.Duration
+
+	// Dial timeout for establishing new connections.
+	// Default is 5 seconds.
+	DialTimeout time.Duration
+	// Timeout for socket reads. If reached, commands will fail
+	// with a timeout instead of blocking. Supported values:
+	//   - `0` - default timeout (3 seconds).
+	//   - `-1` - no timeout (block indefinitely).
+	//   - `-2` - disables SetReadDeadline calls completely.
+	ReadTimeout time.Duration
+	// Timeout for socket writes. If reached, commands will fail
+	// with a timeout instead of blocking.  Supported values:
+	//   - `0` - default timeout (3 seconds).
+	//   - `-1` - no timeout (block indefinitely).
+	//   - `-2` - disables SetWriteDeadline calls completely.
+	WriteTimeout time.Duration
+
+	// Type of connection pool.
+	// true for FIFO pool, false for LIFO pool.
+	// Note that FIFO has slightly higher overhead compared to LIFO,
+	// but it helps closing idle connections faster reducing the pool size.
+	PoolFIFO bool
+	// Base number of socket connections.
+	// Default is 10 connections per every available CPU as reported by runtime.GOMAXPROCS.
+	// If there is not enough connections in the pool, new connections will be allocated in excess of PoolSize,
+	// you can limit it through MaxActiveConns
+	PoolSize int
+	// Amount of time client waits for connection if all connections
+	// are busy before returning an error.
+	// Default is ReadTimeout + 1 second.
+	PoolTimeout time.Duration
+	// Minimum number of idle connections which is useful when establishing
+	// new connection is slow.
+	// Default is 0. the idle connections are not closed by default.
+	MinIdleConns int
+	// Maximum number of idle connections.
+	// Default is 0. the idle connections are not closed by default.
+	MaxIdleConns int
+	// Maximum number of connections allocated by the pool at a given time.
+	// When zero, there is no limit on the number of connections in the pool.
+	MaxActiveConns int
+	// ConnMaxIdleTime is the maximum amount of time a connection may be idle.
+	// Should be less than server's timeout.
+	//
+	// Expired connections may be closed lazily before reuse.
+	// If d <= 0, connections are not closed due to a connection's idle time.
+	//
+	// Default is 30 minutes. -1 disables idle timeout check.
+	ConnMaxIdleTime time.Duration
+	// ConnMaxLifetime is the maximum amount of time a connection may be reused.
+	//
+	// Expired connections may be closed lazily before reuse.
+	// If <= 0, connections are not closed due to a connection's age.
+	//
+	// Default is to not close idle connections.
+	ConnMaxLifetime time.Duration
+
+	EnableTLS bool
+
+	// Disable set-lib on connect. Default is false.
+	DisableIndentity bool
+
+	// Add suffix to client name. Default is empty.
+	IdentitySuffix string
+}
+
+type Connector struct {
+	*redis.Client
+	Config Config
+}
+
+func NewConnector(config Config) *Connector {
+	if !config.Enabled {
+		return nil
+	}
+	return &Connector{
+		Client: redis.NewClient(optionsFromConfig(config)),
+		Config: config,
+	}
+}
+
+func optionsFromConfig(c Config) *redis.Options {
+	opts := &redis.Options{
+		Network:               c.Network,
+		Addr:                  c.Addr,
+		ClientName:            c.ClientName,
+		Protocol:              3,
+		Username:              c.Username,
+		Password:              c.Password,
+		MaxRetries:            c.MaxRetries,
+		MinRetryBackoff:       c.MinRetryBackoff,
+		MaxRetryBackoff:       c.MaxRetryBackoff,
+		DialTimeout:           c.DialTimeout,
+		ReadTimeout:           c.ReadTimeout,
+		WriteTimeout:          c.WriteTimeout,
+		ContextTimeoutEnabled: true,
+		PoolFIFO:              c.PoolFIFO,
+		PoolTimeout:           c.PoolTimeout,
+		MinIdleConns:          c.MinIdleConns,
+		MaxIdleConns:          c.MaxIdleConns,
+		MaxActiveConns:        c.MaxActiveConns,
+		ConnMaxIdleTime:       c.ConnMaxIdleTime,
+		ConnMaxLifetime:       c.ConnMaxLifetime,
+		DisableIndentity:      c.DisableIndentity,
+		IdentitySuffix:        c.IdentitySuffix,
+	}
+	if c.EnableTLS {
+		opts.TLSConfig = new(tls.Config)
+	}
+	return opts
+}

internal/cache/connector/redis/get.lua

@@ -0,0 +1,29 @@
+local result = redis.call("GET", KEYS[1])
+if result == false then
+    return nil
+end
+local object_id = tostring(result)
+
+local object = getCall("HGET", object_id, "object")
+if object == nil then
+    -- object expired, but there are keys that need to be cleaned up
+    remove(object_id)
+    return nil
+end
+
+-- max-age must be checked manually
+local expiry = getCall("HGET", object_id, "expiry")
+if not (expiry == nil) and expiry > 0 then
+    if getTime() > expiry then
+        remove(object_id)
+        return nil
+    end
+end
+
+local usage_lifetime = getCall("HGET", object_id, "usage_lifetime")
+-- reset usage based TTL
+if not (usage_lifetime == nil) and tonumber(usage_lifetime) > 0 then
+    redis.call('EXPIRE', object_id, usage_lifetime)
+end
+
+return object

internal/cache/connector/redis/invalidate.lua

@@ -0,0 +1,9 @@
+local n = #KEYS
+for i = 1, n do
+    local result = redis.call("GET", KEYS[i])
+    if result == false then
+        return nil
+    end
+    local object_id = tostring(result)
+    remove(object_id)
+end

internal/cache/connector/redis/redis.go

@@ -0,0 +1,172 @@
+package redis
+
+import (
+	"context"
+	_ "embed"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"log/slog"
+	"strings"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/redis/go-redis/v9"
+
+	"github.com/zitadel/zitadel/internal/cache"
+	"github.com/zitadel/zitadel/internal/telemetry/tracing"
+)
+
+var (
+	//go:embed _select.lua
+	selectComponent string
+	//go:embed _util.lua
+	utilComponent string
+	//go:embed _remove.lua
+	removeComponent string
+	//go:embed set.lua
+	setScript string
+	//go:embed get.lua
+	getScript string
+	//go:embed invalidate.lua
+	invalidateScript string
+
+	// Don't mind the creative "import"
+	setParsed        = redis.NewScript(strings.Join([]string{selectComponent, utilComponent, setScript}, "\n"))
+	getParsed        = redis.NewScript(strings.Join([]string{selectComponent, utilComponent, removeComponent, getScript}, "\n"))
+	invalidateParsed = redis.NewScript(strings.Join([]string{selectComponent, utilComponent, removeComponent, invalidateScript}, "\n"))
+)
+
+type redisCache[I, K comparable, V cache.Entry[I, K]] struct {
+	db        int
+	config    *cache.Config
+	indices   []I
+	connector *Connector
+	logger    *slog.Logger
+}
+
+// NewCache returns a cache that stores and retrieves object using single Redis.
+func NewCache[I, K comparable, V cache.Entry[I, K]](config cache.Config, client *Connector, db int, indices []I) cache.Cache[I, K, V] {
+	return &redisCache[I, K, V]{
+		config:    &config,
+		db:        db,
+		indices:   indices,
+		connector: client,
+		logger:    config.Log.Slog(),
+	}
+}
+
+func (c *redisCache[I, K, V]) Set(ctx context.Context, value V) {
+	if _, err := c.set(ctx, value); err != nil {
+		c.logger.ErrorContext(ctx, "redis cache set", "err", err)
+	}
+}
+
+func (c *redisCache[I, K, V]) set(ctx context.Context, value V) (objectID string, err error) {
+	ctx, span := tracing.NewSpan(ctx)
+	defer func() { span.EndWithError(err) }()
+
+	// Internal ID used for the object
+	objectID = uuid.NewString()
+	keys := []string{objectID}
+	// flatten the secondary keys
+	for _, index := range c.indices {
+		keys = append(keys, c.redisIndexKeys(index, value.Keys(index)...)...)
+	}
+	var buf strings.Builder
+	err = json.NewEncoder(&buf).Encode(value)
+	if err != nil {
+		return "", err
+	}
+	err = setParsed.Run(ctx, c.connector, keys,
+		c.db,                                   // DB namespace
+		buf.String(),                           // object
+		int64(c.config.LastUseAge/time.Second), // usage_lifetime
+		int64(c.config.MaxAge/time.Second),     // max_age,
+	).Err()
+	// redis.Nil is always returned because the script doesn't have a return value.
+	if err != nil && !errors.Is(err, redis.Nil) {
+		return "", err
+	}
+	return objectID, nil
+}
+
+func (c *redisCache[I, K, V]) Get(ctx context.Context, index I, key K) (value V, ok bool) {
+	var (
+		obj any
+		err error
+	)
+	ctx, span := tracing.NewSpan(ctx)
+	defer func() {
+		if errors.Is(err, redis.Nil) {
+			err = nil
+		}
+		span.EndWithError(err)
+	}()
+
+	logger := c.logger.With("index", index, "key", key)
+	obj, err = getParsed.Run(ctx, c.connector, c.redisIndexKeys(index, key), c.db).Result()
+	if err != nil && !errors.Is(err, redis.Nil) {
+		logger.ErrorContext(ctx, "redis cache get", "err", err)
+		return value, false
+	}
+	data, ok := obj.(string)
+	if !ok {
+		logger.With("err", err).InfoContext(ctx, "redis cache miss")
+		return value, false
+	}
+	err = json.NewDecoder(strings.NewReader(data)).Decode(&value)
+	if err != nil {
+		logger.ErrorContext(ctx, "redis cache get", "err", fmt.Errorf("decode: %w", err))
+		return value, false
+	}
+	return value, true
+}
+
+func (c *redisCache[I, K, V]) Invalidate(ctx context.Context, index I, key ...K) (err error) {
+	ctx, span := tracing.NewSpan(ctx)
+	defer func() { span.EndWithError(err) }()
+
+	if len(key) == 0 {
+		return nil
+	}
+	err = invalidateParsed.Run(ctx, c.connector, c.redisIndexKeys(index, key...), c.db).Err()
+	// redis.Nil is always returned because the script doesn't have a return value.
+	if err != nil && !errors.Is(err, redis.Nil) {
+		return err
+	}
+	return nil
+}
+
+func (c *redisCache[I, K, V]) Delete(ctx context.Context, index I, key ...K) (err error) {
+	ctx, span := tracing.NewSpan(ctx)
+	defer func() { span.EndWithError(err) }()
+
+	if len(key) == 0 {
+		return nil
+	}
+	pipe := c.connector.Pipeline()
+	pipe.Select(ctx, c.db)
+	pipe.Del(ctx, c.redisIndexKeys(index, key...)...)
+	_, err = pipe.Exec(ctx)
+	return err
+}
+
+func (c *redisCache[I, K, V]) Truncate(ctx context.Context) (err error) {
+	ctx, span := tracing.NewSpan(ctx)
+	defer func() { span.EndWithError(err) }()
+
+	pipe := c.connector.Pipeline()
+	pipe.Select(ctx, c.db)
+	pipe.FlushDB(ctx)
+	_, err = pipe.Exec(ctx)
+	return err
+}
+
+func (c *redisCache[I, K, V]) redisIndexKeys(index I, keys ...K) []string {
+	out := make([]string, len(keys))
+	for i, k := range keys {
+		out[i] = fmt.Sprintf("%v:%v", index, k)
+	}
+	return out
+}

internal/cache/connector/redis/redis_test.go

@@ -0,0 +1,714 @@
+package redis
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/alicebob/miniredis/v2"
+	"github.com/redis/go-redis/v9"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/zitadel/logging"
+
+	"github.com/zitadel/zitadel/internal/cache"
+)
+
+type testIndex int
+
+const (
+	testIndexID testIndex = iota
+	testIndexName
+)
+
+const (
+	testDB = 99
+)
+
+var testIndices = []testIndex{
+	testIndexID,
+	testIndexName,
+}
+
+type testObject struct {
+	ID   string
+	Name []string
+}
+
+func (o *testObject) Keys(index testIndex) []string {
+	switch index {
+	case testIndexID:
+		return []string{o.ID}
+	case testIndexName:
+		return o.Name
+	default:
+		return nil
+	}
+}
+
+func Test_redisCache_set(t *testing.T) {
+	type args struct {
+		ctx   context.Context
+		value *testObject
+	}
+	tests := []struct {
+		name       string
+		config     cache.Config
+		args       args
+		assertions func(t *testing.T, s *miniredis.Miniredis, objectID string)
+		wantErr    error
+	}{
+		{
+			name:   "ok",
+			config: cache.Config{},
+			args: args{
+				ctx: context.Background(),
+				value: &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				},
+			},
+			assertions: func(t *testing.T, s *miniredis.Miniredis, objectID string) {
+				s.CheckGet(t, "0:one", objectID)
+				s.CheckGet(t, "1:foo", objectID)
+				s.CheckGet(t, "1:bar", objectID)
+				assert.Empty(t, s.HGet(objectID, "expiry"))
+				assert.JSONEq(t, `{"ID":"one","Name":["foo","bar"]}`, s.HGet(objectID, "object"))
+			},
+		},
+		{
+			name: "with last use TTL",
+			config: cache.Config{
+				LastUseAge: time.Second,
+			},
+			args: args{
+				ctx: context.Background(),
+				value: &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				},
+			},
+			assertions: func(t *testing.T, s *miniredis.Miniredis, objectID string) {
+				s.CheckGet(t, "0:one", objectID)
+				s.CheckGet(t, "1:foo", objectID)
+				s.CheckGet(t, "1:bar", objectID)
+				assert.Empty(t, s.HGet(objectID, "expiry"))
+				assert.JSONEq(t, `{"ID":"one","Name":["foo","bar"]}`, s.HGet(objectID, "object"))
+				assert.Positive(t, s.TTL(objectID))
+
+				s.FastForward(2 * time.Second)
+				v, err := s.Get(objectID)
+				require.Error(t, err)
+				assert.Empty(t, v)
+			},
+		},
+		{
+			name: "with last use TTL and max age",
+			config: cache.Config{
+				MaxAge:     time.Minute,
+				LastUseAge: time.Second,
+			},
+			args: args{
+				ctx: context.Background(),
+				value: &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				},
+			},
+			assertions: func(t *testing.T, s *miniredis.Miniredis, objectID string) {
+				s.CheckGet(t, "0:one", objectID)
+				s.CheckGet(t, "1:foo", objectID)
+				s.CheckGet(t, "1:bar", objectID)
+				assert.NotEmpty(t, s.HGet(objectID, "expiry"))
+				assert.JSONEq(t, `{"ID":"one","Name":["foo","bar"]}`, s.HGet(objectID, "object"))
+				assert.Positive(t, s.TTL(objectID))
+
+				s.FastForward(2 * time.Second)
+				v, err := s.Get(objectID)
+				require.Error(t, err)
+				assert.Empty(t, v)
+			},
+		},
+		{
+			name: "with max age TTL",
+			config: cache.Config{
+				MaxAge: time.Minute,
+			},
+			args: args{
+				ctx: context.Background(),
+				value: &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				},
+			},
+			assertions: func(t *testing.T, s *miniredis.Miniredis, objectID string) {
+				s.CheckGet(t, "0:one", objectID)
+				s.CheckGet(t, "1:foo", objectID)
+				s.CheckGet(t, "1:bar", objectID)
+				assert.Empty(t, s.HGet(objectID, "expiry"))
+				assert.JSONEq(t, `{"ID":"one","Name":["foo","bar"]}`, s.HGet(objectID, "object"))
+				assert.Positive(t, s.TTL(objectID))
+
+				s.FastForward(2 * time.Minute)
+				v, err := s.Get(objectID)
+				require.Error(t, err)
+				assert.Empty(t, v)
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			c, server := prepareCache(t, tt.config)
+			rc := c.(*redisCache[testIndex, string, *testObject])
+			objectID, err := rc.set(tt.args.ctx, tt.args.value)
+			require.ErrorIs(t, err, tt.wantErr)
+			t.Log(rc.connector.HGetAll(context.Background(), objectID))
+			tt.assertions(t, server, objectID)
+		})
+	}
+}
+
+func Test_redisCache_Get(t *testing.T) {
+	type args struct {
+		ctx   context.Context
+		index testIndex
+		key   string
+	}
+	tests := []struct {
+		name        string
+		config      cache.Config
+		preparation func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis)
+		args        args
+		want        *testObject
+		wantOK      bool
+	}{
+		{
+			name:   "connection error",
+			config: cache.Config{},
+			preparation: func(_ *testing.T, _ cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				s.RequireAuth("foobar")
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexName,
+				key:   "foo",
+			},
+			wantOK: false,
+		},
+		{
+			name:   "get by ID",
+			config: cache.Config{},
+			preparation: func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				c.Set(context.Background(), &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				})
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexID,
+				key:   "one",
+			},
+			want: &testObject{
+				ID:   "one",
+				Name: []string{"foo", "bar"},
+			},
+			wantOK: true,
+		},
+		{
+			name:   "get by name",
+			config: cache.Config{},
+			preparation: func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				c.Set(context.Background(), &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				})
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexName,
+				key:   "foo",
+			},
+			want: &testObject{
+				ID:   "one",
+				Name: []string{"foo", "bar"},
+			},
+			wantOK: true,
+		},
+		{
+			name: "usage timeout",
+			config: cache.Config{
+				LastUseAge: time.Minute,
+			},
+			preparation: func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				c.Set(context.Background(), &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				})
+				_, ok := c.Get(context.Background(), testIndexID, "one")
+				require.True(t, ok)
+				s.FastForward(2 * time.Minute)
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexName,
+				key:   "foo",
+			},
+			want:   nil,
+			wantOK: false,
+		},
+		{
+			name: "max age timeout",
+			config: cache.Config{
+				MaxAge: time.Minute,
+			},
+			preparation: func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				c.Set(context.Background(), &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				})
+				_, ok := c.Get(context.Background(), testIndexID, "one")
+				require.True(t, ok)
+				s.FastForward(2 * time.Minute)
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexName,
+				key:   "foo",
+			},
+			want:   nil,
+			wantOK: false,
+		},
+		{
+			name:   "not found",
+			config: cache.Config{},
+			preparation: func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				c.Set(context.Background(), &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				})
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexName,
+				key:   "spanac",
+			},
+			wantOK: false,
+		},
+		{
+			name:   "json decode error",
+			config: cache.Config{},
+			preparation: func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				c.Set(context.Background(), &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				})
+				objectID, err := s.Get(c.(*redisCache[testIndex, string, *testObject]).redisIndexKeys(testIndexID, "one")[0])
+				require.NoError(t, err)
+				s.HSet(objectID, "object", "~~~")
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexID,
+				key:   "one",
+			},
+			wantOK: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			c, server := prepareCache(t, tt.config)
+			tt.preparation(t, c, server)
+			t.Log(server.Keys())
+
+			got, ok := c.Get(tt.args.ctx, tt.args.index, tt.args.key)
+			require.Equal(t, tt.wantOK, ok)
+			assert.Equal(t, tt.want, got)
+		})
+	}
+}
+
+func Test_redisCache_Invalidate(t *testing.T) {
+	type args struct {
+		ctx   context.Context
+		index testIndex
+		key   []string
+	}
+	tests := []struct {
+		name        string
+		config      cache.Config
+		preparation func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis)
+		assertions  func(t *testing.T, c cache.Cache[testIndex, string, *testObject])
+		args        args
+		wantErr     bool
+	}{
+		{
+			name:   "connection error",
+			config: cache.Config{},
+			preparation: func(_ *testing.T, _ cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				s.RequireAuth("foobar")
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexName,
+				key:   []string{"foo"},
+			},
+			wantErr: true,
+		},
+		{
+			name:   "no keys, noop",
+			config: cache.Config{},
+			preparation: func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				c.Set(context.Background(), &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				})
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexID,
+				key:   []string{},
+			},
+			wantErr: false,
+		},
+		{
+			name:   "invalidate by ID",
+			config: cache.Config{},
+			preparation: func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				c.Set(context.Background(), &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				})
+			},
+			assertions: func(t *testing.T, c cache.Cache[testIndex, string, *testObject]) {
+				obj, ok := c.Get(context.Background(), testIndexID, "one")
+				assert.False(t, ok)
+				assert.Nil(t, obj)
+				obj, ok = c.Get(context.Background(), testIndexName, "foo")
+				assert.False(t, ok)
+				assert.Nil(t, obj)
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexID,
+				key:   []string{"one"},
+			},
+			wantErr: false,
+		},
+		{
+			name:   "invalidate by name",
+			config: cache.Config{},
+			preparation: func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				c.Set(context.Background(), &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				})
+			},
+			assertions: func(t *testing.T, c cache.Cache[testIndex, string, *testObject]) {
+				obj, ok := c.Get(context.Background(), testIndexID, "one")
+				assert.False(t, ok)
+				assert.Nil(t, obj)
+				obj, ok = c.Get(context.Background(), testIndexName, "foo")
+				assert.False(t, ok)
+				assert.Nil(t, obj)
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexName,
+				key:   []string{"foo"},
+			},
+			wantErr: false,
+		},
+		{
+			name: "invalidate after timeout",
+			config: cache.Config{
+				LastUseAge: time.Minute,
+			},
+			preparation: func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				c.Set(context.Background(), &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				})
+				_, ok := c.Get(context.Background(), testIndexID, "one")
+				require.True(t, ok)
+				s.FastForward(2 * time.Minute)
+			},
+			assertions: func(t *testing.T, c cache.Cache[testIndex, string, *testObject]) {
+				obj, ok := c.Get(context.Background(), testIndexID, "one")
+				assert.False(t, ok)
+				assert.Nil(t, obj)
+				obj, ok = c.Get(context.Background(), testIndexName, "foo")
+				assert.False(t, ok)
+				assert.Nil(t, obj)
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexName,
+				key:   []string{"foo"},
+			},
+			wantErr: false,
+		},
+		{
+			name:   "not found",
+			config: cache.Config{},
+			preparation: func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				c.Set(context.Background(), &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				})
+			},
+			assertions: func(t *testing.T, c cache.Cache[testIndex, string, *testObject]) {
+				obj, ok := c.Get(context.Background(), testIndexID, "one")
+				assert.True(t, ok)
+				assert.NotNil(t, obj)
+				obj, ok = c.Get(context.Background(), testIndexName, "foo")
+				assert.True(t, ok)
+				assert.NotNil(t, obj)
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexName,
+				key:   []string{"spanac"},
+			},
+			wantErr: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			c, server := prepareCache(t, tt.config)
+			tt.preparation(t, c, server)
+			t.Log(server.Keys())
+
+			err := c.Invalidate(tt.args.ctx, tt.args.index, tt.args.key...)
+			if tt.wantErr {
+				require.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+		})
+	}
+}
+
+func Test_redisCache_Delete(t *testing.T) {
+	type args struct {
+		ctx   context.Context
+		index testIndex
+		key   []string
+	}
+	tests := []struct {
+		name        string
+		config      cache.Config
+		preparation func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis)
+		assertions  func(t *testing.T, c cache.Cache[testIndex, string, *testObject])
+		args        args
+		wantErr     bool
+	}{
+		{
+			name:   "connection error",
+			config: cache.Config{},
+			preparation: func(_ *testing.T, _ cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				s.RequireAuth("foobar")
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexName,
+				key:   []string{"foo"},
+			},
+			wantErr: true,
+		},
+		{
+			name:   "no keys, noop",
+			config: cache.Config{},
+			preparation: func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				c.Set(context.Background(), &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				})
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexID,
+				key:   []string{},
+			},
+			wantErr: false,
+		},
+		{
+			name:   "delete ID",
+			config: cache.Config{},
+			preparation: func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				c.Set(context.Background(), &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				})
+			},
+			assertions: func(t *testing.T, c cache.Cache[testIndex, string, *testObject]) {
+				obj, ok := c.Get(context.Background(), testIndexID, "one")
+				assert.False(t, ok)
+				assert.Nil(t, obj)
+				// Get be name should still work
+				obj, ok = c.Get(context.Background(), testIndexName, "foo")
+				assert.True(t, ok)
+				assert.NotNil(t, obj)
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexID,
+				key:   []string{"one"},
+			},
+			wantErr: false,
+		},
+		{
+			name:   "delete name",
+			config: cache.Config{},
+			preparation: func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				c.Set(context.Background(), &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				})
+			},
+			assertions: func(t *testing.T, c cache.Cache[testIndex, string, *testObject]) {
+				// get by ID should still work
+				obj, ok := c.Get(context.Background(), testIndexID, "one")
+				assert.True(t, ok)
+				assert.NotNil(t, obj)
+				obj, ok = c.Get(context.Background(), testIndexName, "foo")
+				assert.False(t, ok)
+				assert.Nil(t, obj)
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexName,
+				key:   []string{"foo"},
+			},
+			wantErr: false,
+		},
+		{
+			name:   "not found",
+			config: cache.Config{},
+			preparation: func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				c.Set(context.Background(), &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				})
+			},
+			assertions: func(t *testing.T, c cache.Cache[testIndex, string, *testObject]) {
+				obj, ok := c.Get(context.Background(), testIndexID, "one")
+				assert.True(t, ok)
+				assert.NotNil(t, obj)
+				obj, ok = c.Get(context.Background(), testIndexName, "foo")
+				assert.True(t, ok)
+				assert.NotNil(t, obj)
+			},
+			args: args{
+				ctx:   context.Background(),
+				index: testIndexName,
+				key:   []string{"spanac"},
+			},
+			wantErr: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			c, server := prepareCache(t, tt.config)
+			tt.preparation(t, c, server)
+			t.Log(server.Keys())
+
+			err := c.Delete(tt.args.ctx, tt.args.index, tt.args.key...)
+			if tt.wantErr {
+				require.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+		})
+	}
+}
+
+func Test_redisCache_Truncate(t *testing.T) {
+	type args struct {
+		ctx context.Context
+	}
+	tests := []struct {
+		name        string
+		config      cache.Config
+		preparation func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis)
+		assertions  func(t *testing.T, c cache.Cache[testIndex, string, *testObject])
+		args        args
+		wantErr     bool
+	}{
+		{
+			name:   "connection error",
+			config: cache.Config{},
+			preparation: func(_ *testing.T, _ cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				s.RequireAuth("foobar")
+			},
+			args: args{
+				ctx: context.Background(),
+			},
+			wantErr: true,
+		},
+		{
+			name:   "ok",
+			config: cache.Config{},
+			preparation: func(t *testing.T, c cache.Cache[testIndex, string, *testObject], s *miniredis.Miniredis) {
+				c.Set(context.Background(), &testObject{
+					ID:   "one",
+					Name: []string{"foo", "bar"},
+				})
+				c.Set(context.Background(), &testObject{
+					ID:   "two",
+					Name: []string{"Hello", "World"},
+				})
+			},
+			assertions: func(t *testing.T, c cache.Cache[testIndex, string, *testObject]) {
+				obj, ok := c.Get(context.Background(), testIndexID, "one")
+				assert.False(t, ok)
+				assert.Nil(t, obj)
+				obj, ok = c.Get(context.Background(), testIndexName, "World")
+				assert.False(t, ok)
+				assert.Nil(t, obj)
+			},
+			args: args{
+				ctx: context.Background(),
+			},
+			wantErr: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			c, server := prepareCache(t, tt.config)
+			tt.preparation(t, c, server)
+			t.Log(server.Keys())
+
+			err := c.Truncate(tt.args.ctx)
+			if tt.wantErr {
+				require.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+		})
+	}
+}
+
+func prepareCache(t *testing.T, conf cache.Config) (cache.Cache[testIndex, string, *testObject], *miniredis.Miniredis) {
+	conf.Log = &logging.Config{
+		Level:     "debug",
+		AddSource: true,
+	}
+	server := miniredis.RunT(t)
+	server.Select(testDB)
+	client := redis.NewClient(&redis.Options{
+		Network: "tcp",
+		Addr:    server.Addr(),
+	})
+	t.Cleanup(func() {
+		client.Close()
+		server.Close()
+	})
+	connector := NewConnector(Config{
+		Enabled: true,
+		Network: "tcp",
+		Addr:    server.Addr(),
+	})
+	c := NewCache[testIndex, string, *testObject](conf, connector, testDB, testIndices)
+	return c, server
+}

internal/cache/connector/redis/set.lua

@@ -0,0 +1,27 @@
+-- KEYS: [1]: object_id; [>1]: index keys.
+local object_id = KEYS[1]
+local object = ARGV[2]
+local usage_lifetime = tonumber(ARGV[3]) -- usage based lifetime in seconds
+local max_age = tonumber(ARGV[4]) -- max age liftime in seconds
+
+redis.call("HSET", object_id,"object", object)
+if usage_lifetime > 0 then
+    redis.call("HSET", object_id, "usage_lifetime", usage_lifetime)
+    -- enable usage based TTL
+    redis.call("EXPIRE", object_id, usage_lifetime)
+    if max_age > 0 then
+        -- set max_age to hash map for expired remove on Get
+        local expiry = getTime() + max_age
+        redis.call("HSET", object_id, "expiry", expiry)
+    end
+elseif max_age > 0 then
+    -- enable max_age based TTL
+    redis.call("EXPIRE", object_id, max_age)
+end
+
+local n = #KEYS
+local setKey = keySetKey(object_id)
+for i = 2, n do -- offset to the second element to skip object_id
+    redis.call("SADD", setKey, KEYS[i]) -- set of all keys used for housekeeping
+    redis.call("SET", KEYS[i], object_id) -- key to object_id mapping
+end

internal/cache/connector_enumer.go

@@ -0,0 +1,98 @@
+// Code generated by "enumer -type Connector -transform snake -trimprefix Connector -linecomment -text"; DO NOT EDIT.
+
+package cache
+
+import (
+	"fmt"
+	"strings"
+)
+
+const _ConnectorName = "memorypostgresredis"
+
+var _ConnectorIndex = [...]uint8{0, 0, 6, 14, 19}
+
+const _ConnectorLowerName = "memorypostgresredis"
+
+func (i Connector) String() string {
+	if i < 0 || i >= Connector(len(_ConnectorIndex)-1) {
+		return fmt.Sprintf("Connector(%d)", i)
+	}
+	return _ConnectorName[_ConnectorIndex[i]:_ConnectorIndex[i+1]]
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _ConnectorNoOp() {
+	var x [1]struct{}
+	_ = x[ConnectorUnspecified-(0)]
+	_ = x[ConnectorMemory-(1)]
+	_ = x[ConnectorPostgres-(2)]
+	_ = x[ConnectorRedis-(3)]
+}
+
+var _ConnectorValues = []Connector{ConnectorUnspecified, ConnectorMemory, ConnectorPostgres, ConnectorRedis}
+
+var _ConnectorNameToValueMap = map[string]Connector{
+	_ConnectorName[0:0]:        ConnectorUnspecified,
+	_ConnectorLowerName[0:0]:   ConnectorUnspecified,
+	_ConnectorName[0:6]:        ConnectorMemory,
+	_ConnectorLowerName[0:6]:   ConnectorMemory,
+	_ConnectorName[6:14]:       ConnectorPostgres,
+	_ConnectorLowerName[6:14]:  ConnectorPostgres,
+	_ConnectorName[14:19]:      ConnectorRedis,
+	_ConnectorLowerName[14:19]: ConnectorRedis,
+}
+
+var _ConnectorNames = []string{
+	_ConnectorName[0:0],
+	_ConnectorName[0:6],
+	_ConnectorName[6:14],
+	_ConnectorName[14:19],
+}
+
+// ConnectorString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func ConnectorString(s string) (Connector, error) {
+	if val, ok := _ConnectorNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _ConnectorNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Connector values", s)
+}
+
+// ConnectorValues returns all values of the enum
+func ConnectorValues() []Connector {
+	return _ConnectorValues
+}
+
+// ConnectorStrings returns a slice of all String values of the enum
+func ConnectorStrings() []string {
+	strs := make([]string, len(_ConnectorNames))
+	copy(strs, _ConnectorNames)
+	return strs
+}
+
+// IsAConnector returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Connector) IsAConnector() bool {
+	for _, v := range _ConnectorValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}
+
+// MarshalText implements the encoding.TextMarshaler interface for Connector
+func (i Connector) MarshalText() ([]byte, error) {
+	return []byte(i.String()), nil
+}
+
+// UnmarshalText implements the encoding.TextUnmarshaler interface for Connector
+func (i *Connector) UnmarshalText(text []byte) error {
+	var err error
+	*i, err = ConnectorString(string(text))
+	return err
+}

internal/cache/pruner.go

@@ -31,22 +31,22 @@ type AutoPruneConfig struct {
 	Timeout time.Duration
 }
 
-func (c AutoPruneConfig) StartAutoPrune(background context.Context, pruner Pruner, name string) (close func()) {
-	return c.startAutoPrune(background, pruner, name, clockwork.NewRealClock())
+func (c AutoPruneConfig) StartAutoPrune(background context.Context, pruner Pruner, purpose Purpose) (close func()) {
+	return c.startAutoPrune(background, pruner, purpose, clockwork.NewRealClock())
 }
 
-func (c *AutoPruneConfig) startAutoPrune(background context.Context, pruner Pruner, name string, clock clockwork.Clock) (close func()) {
+func (c *AutoPruneConfig) startAutoPrune(background context.Context, pruner Pruner, purpose Purpose, clock clockwork.Clock) (close func()) {
 	if c.Interval <= 0 {
 		return func() {}
 	}
 	background, cancel := context.WithCancel(background)
 	// randomize the first interval
 	timer := clock.NewTimer(time.Duration(rand.Int63n(int64(c.Interval))))
-	go c.pruneTimer(background, pruner, name, timer)
+	go c.pruneTimer(background, pruner, purpose, timer)
 	return cancel
 }
 
-func (c *AutoPruneConfig) pruneTimer(background context.Context, pruner Pruner, name string, timer clockwork.Timer) {
+func (c *AutoPruneConfig) pruneTimer(background context.Context, pruner Pruner, purpose Purpose, timer clockwork.Timer) {
 	defer func() {
 		if !timer.Stop() {
 			<-timer.Chan()
@@ -58,9 +58,9 @@ func (c *AutoPruneConfig) pruneTimer(background context.Context, pruner Pruner,
 		case <-background.Done():
 			return
 		case <-timer.Chan():
-			timer.Reset(c.Interval)
 			err := c.doPrune(background, pruner)
-			logging.OnError(err).WithField("name", name).Error("cache auto prune")
+			logging.OnError(err).WithField("purpose", purpose).Error("cache auto prune")
+			timer.Reset(c.Interval)
 		}
 	}
 }

internal/cache/pruner_test.go

@@ -30,7 +30,7 @@ func TestAutoPruneConfig_startAutoPrune(t *testing.T) {
 		called: make(chan struct{}),
 	}
 	clock := clockwork.NewFakeClock()
-	close := c.startAutoPrune(ctx, &pruner, "foo", clock)
+	close := c.startAutoPrune(ctx, &pruner, PurposeAuthzInstance, clock)
 	defer close()
 	clock.Advance(time.Second)
 

internal/cache/purpose_enumer.go

@@ -0,0 +1,82 @@
+// Code generated by "enumer -type Purpose -transform snake -trimprefix Purpose"; DO NOT EDIT.
+
+package cache
+
+import (
+	"fmt"
+	"strings"
+)
+
+const _PurposeName = "unspecifiedauthz_instancemilestones"
+
+var _PurposeIndex = [...]uint8{0, 11, 25, 35}
+
+const _PurposeLowerName = "unspecifiedauthz_instancemilestones"
+
+func (i Purpose) String() string {
+	if i < 0 || i >= Purpose(len(_PurposeIndex)-1) {
+		return fmt.Sprintf("Purpose(%d)", i)
+	}
+	return _PurposeName[_PurposeIndex[i]:_PurposeIndex[i+1]]
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _PurposeNoOp() {
+	var x [1]struct{}
+	_ = x[PurposeUnspecified-(0)]
+	_ = x[PurposeAuthzInstance-(1)]
+	_ = x[PurposeMilestones-(2)]
+}
+
+var _PurposeValues = []Purpose{PurposeUnspecified, PurposeAuthzInstance, PurposeMilestones}
+
+var _PurposeNameToValueMap = map[string]Purpose{
+	_PurposeName[0:11]:       PurposeUnspecified,
+	_PurposeLowerName[0:11]:  PurposeUnspecified,
+	_PurposeName[11:25]:      PurposeAuthzInstance,
+	_PurposeLowerName[11:25]: PurposeAuthzInstance,
+	_PurposeName[25:35]:      PurposeMilestones,
+	_PurposeLowerName[25:35]: PurposeMilestones,
+}
+
+var _PurposeNames = []string{
+	_PurposeName[0:11],
+	_PurposeName[11:25],
+	_PurposeName[25:35],
+}
+
+// PurposeString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func PurposeString(s string) (Purpose, error) {
+	if val, ok := _PurposeNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _PurposeNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Purpose values", s)
+}
+
+// PurposeValues returns all values of the enum
+func PurposeValues() []Purpose {
+	return _PurposeValues
+}
+
+// PurposeStrings returns a slice of all String values of the enum
+func PurposeStrings() []string {
+	strs := make([]string, len(_PurposeNames))
+	copy(strs, _PurposeNames)
+	return strs
+}
+
+// IsAPurpose returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Purpose) IsAPurpose() bool {
+	for _, v := range _PurposeValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}