MM-62079: Using a cache prefix to isolate cache keys for each test (#30261)

```release-note
A new config setting CacheSettings.RedisCachePrefix has been added which can be used to add a prefix to all Redis cache keys.
```

server/channels/api4/apitestlib.go

@@ -113,6 +113,7 @@ func setupTestHelper(dbStore store.Store, searchEngine *searchengine.Broker, ent
 		*memoryConfig.CacheSettings.RedisAddress = redisHost + ":6379"
 		*memoryConfig.CacheSettings.DisableClientCache = true
 		*memoryConfig.CacheSettings.RedisDB = 0
+		*memoryConfig.CacheSettings.RedisCachePrefix = model.NewId()
 		options = append(options, app.ForceEnableRedis())
 	}
 	if updateConfig != nil {

server/channels/api4/post_test.go

@@ -131,7 +131,6 @@ func TestCreatePost(t *testing.T) {
 	})
 
 	t.Run("Create posts without the USE_CHANNEL_MENTIONS Permission - returns ephemeral message with mentions and no ephemeral message without mentions", func(t *testing.T) {
-		t.Skip("MM-62764")
 		wsClient := th.CreateConnectedWebSocketClient(t)
 
 		defaultPerms := th.SaveDefaultRolePermissions()
@@ -188,7 +187,6 @@ func TestCreatePost(t *testing.T) {
 				}
 			case <-timeout:
 				require.Fail(t, fmt.Sprintf("Got %d ephemeral messages, expected: %d", gotEvents, expectedEvents))
-				break
 			}
 		}
 	})

server/channels/app/platform/service.go

@@ -168,10 +168,11 @@ func New(sc ServiceConfig, options ...Option) (*PlatformService, error) {
 	} else if *cacheConfig.CacheType == model.CacheTypeRedis {
 		ps.cacheProvider, err = cache.NewRedisProvider(
 			&cache.RedisOptions{
-				RedisAddr:     *cacheConfig.RedisAddress,
-				RedisPassword: *cacheConfig.RedisPassword,
-				RedisDB:       *cacheConfig.RedisDB,
-				DisableCache:  *cacheConfig.DisableClientCache,
+				RedisAddr:        *cacheConfig.RedisAddress,
+				RedisPassword:    *cacheConfig.RedisPassword,
+				RedisDB:          *cacheConfig.RedisDB,
+				RedisCachePrefix: *cacheConfig.RedisCachePrefix,
+				DisableCache:     *cacheConfig.DisableClientCache,
 			},
 		)
 	}

server/platform/services/cache/provider.go

@@ -74,15 +74,17 @@ func (c *cacheProvider) Type() string {
 }
 
 type redisProvider struct {
-	client  rueidis.Client
-	metrics einterfaces.MetricsInterface
+	client      rueidis.Client
+	cachePrefix string
+	metrics     einterfaces.MetricsInterface
 }
 
 type RedisOptions struct {
-	RedisAddr     string
-	RedisPassword string
-	RedisDB       int
-	DisableCache  bool
+	RedisAddr        string
+	RedisPassword    string
+	RedisDB          int
+	RedisCachePrefix string
+	DisableCache     bool
 }
 
 // NewProvider creates a new CacheProvider
@@ -107,11 +109,14 @@ func NewRedisProvider(opts *RedisOptions) (Provider, error) {
 	if err != nil {
 		return nil, err
 	}
-	return &redisProvider{client: client}, nil
+	return &redisProvider{client: client, cachePrefix: opts.RedisCachePrefix}, nil
 }
 
 // NewCache creates a new cache with given opts
 func (r *redisProvider) NewCache(opts *CacheOptions) (Cache, error) {
+	if r.cachePrefix != "" {
+		opts.Name = r.cachePrefix + ":" + opts.Name
+	}
 	rr, err := NewRedis(opts, r.client)
 	rr.metrics = r.metrics
 	return rr, err

server/public/model/config.go

@@ -974,6 +974,7 @@ type CacheSettings struct {
 	RedisAddress       *string `access:",write_restrictable,cloud_restrictable"` // telemetry: none
 	RedisPassword      *string `access:",write_restrictable,cloud_restrictable"` // telemetry: none
 	RedisDB            *int    `access:",write_restrictable,cloud_restrictable"` // telemetry: none
+	RedisCachePrefix   *string `access:",write_restrictable,cloud_restrictable"` // telemetry: none
 	DisableClientCache *bool   `access:",write_restrictable,cloud_restrictable"` // telemetry: none
 }
 
@@ -994,6 +995,10 @@ func (s *CacheSettings) SetDefaults() {
 		s.RedisDB = NewPointer(-1)
 	}
 
+	if s.RedisCachePrefix == nil {
+		s.RedisCachePrefix = NewPointer("")
+	}
+
 	if s.DisableClientCache == nil {
 		s.DisableClientCache = NewPointer(false)
 	}