Work around duplicate registration of groupcache error in tests

pkg/eth/api_test.go

@@ -217,6 +217,7 @@ var _ = Describe("API", func() {
 			RPCGasCap:   big.NewInt(10000000000), // Max gas capacity for a rpc call.
 			GroupCacheConfig: &ethServerShared.GroupCacheConfig{
 				StateDB: ethServerShared.GroupConfig{
+					Name:                   "api_test",
 					CacheSizeInMB:          8,
 					CacheExpiryInMins:      60,
 					LogStatsIntervalInSecs: 0,

pkg/eth/backend.go

@@ -117,9 +117,14 @@ type Config struct {
 func NewEthBackend(db *postgres.DB, c *Config) (*Backend, error) {
 	gcc := c.GroupCacheConfig
 
+	groupName := gcc.StateDB.Name
+	if groupName == "" {
+		groupName = StateDBGroupCacheName
+	}
+
 	r := NewCIDRetriever(db)
 	ethDB := ipfsethdb.NewDatabase(db.DB, ipfsethdb.CacheConfig{
-		Name:           StateDBGroupCacheName,
+		Name:           groupName,
 		Size:           gcc.StateDB.CacheSizeInMB * 1024 * 1024,
 		ExpiryDuration: time.Minute * time.Duration(gcc.StateDB.CacheExpiryInMins),
 	})

pkg/eth/eth_state_test.go

@@ -83,6 +83,7 @@ var _ = Describe("eth state reading tests", func() {
 			RPCGasCap:   big.NewInt(10000000000), // Max gas capacity for a rpc call.
 			GroupCacheConfig: &ethServerShared.GroupCacheConfig{
 				StateDB: ethServerShared.GroupConfig{
+					Name:                   "eth_state_test",
 					CacheSizeInMB:          8,
 					CacheExpiryInMins:      60,
 					LogStatsIntervalInSecs: 0,

pkg/graphql/graphql_test.go

@@ -88,6 +88,7 @@ var _ = Describe("GraphQL", func() {
 			RPCGasCap:   big.NewInt(10000000000),
 			GroupCacheConfig: &ethServerShared.GroupCacheConfig{
 				StateDB: ethServerShared.GroupConfig{
+					Name:                   "graphql_test",
 					CacheSizeInMB:          8,
 					CacheExpiryInMins:      60,
 					LogStatsIntervalInSecs: 0,

pkg/shared/types.go

@@ -26,6 +26,10 @@ type GroupConfig struct {
 	CacheSizeInMB          int
 	CacheExpiryInMins      int
 	LogStatsIntervalInSecs int
+
+	// Used in tests to override the cache name, to work around
+	// the "duplicate registration of group" error from groupcache
+	Name string
 }
 
 type GroupCacheConfig struct {