mcs: Refactor ServicePath to make caller's life easier (#6799)

close #6800

Signed-off-by: Xiaoguang Sun <sunxiaoguang@gmail.com>

Co-authored-by: ti-chi-bot[bot] <108142056+ti-chi-bot[bot]@users.noreply.github.com>

pkg/mcs/discovery/discover.go

@@ -21,7 +21,7 @@ import (
 
 // Discover is used to get all the service instances of the specified service name.
 func Discover(cli *clientv3.Client, clusterID, serviceName string) ([]string, error) {
-	key := ServicePath(clusterID, serviceName) + "/"
+	key := ServicePath(clusterID, serviceName)
 	endKey := clientv3.GetPrefixRangeEnd(key)
 
 	withRange := clientv3.WithRange(endKey)

pkg/mcs/discovery/key_path.go

@@ -32,10 +32,10 @@ func RegistryPath(clusterID, serviceName, serviceAddr string) string {
 
 // ServicePath returns the path to store microservice addresses.
 func ServicePath(clusterID, serviceName string) string {
-	return strings.Join([]string{utils.MicroserviceRootPath, clusterID, serviceName, registryKey}, "/")
+	return strings.Join([]string{utils.MicroserviceRootPath, clusterID, serviceName, registryKey, ""}, "/")
 }
 
 // TSOPath returns the path to store TSO addresses.
 func TSOPath(clusterID uint64) string {
-	return ServicePath(strconv.FormatUint(clusterID, 10), "tso") + "/"
+	return ServicePath(strconv.FormatUint(clusterID, 10), "tso")
 }

pkg/tso/keyspace_group_manager_test.go

@@ -151,7 +151,7 @@ func (suite *keyspaceGroupManagerTestSuite) TestNewKeyspaceGroupManager() {
 
 	tsoServiceID := &discovery.ServiceRegistryEntry{ServiceAddr: suite.cfg.AdvertiseListenAddr}
 	guid := uuid.New().String()
-	tsoServiceKey := discovery.ServicePath(guid, "tso") + "/"
+	tsoServiceKey := discovery.ServicePath(guid, "tso")
 	legacySvcRootPath := path.Join("/pd", guid)
 	tsoSvcRootPath := path.Join(mcsutils.MicroserviceRootPath, guid, "tso")
 	electionNamePrefix := "tso-server-" + guid
@@ -817,7 +817,7 @@ func (suite *keyspaceGroupManagerTestSuite) newKeyspaceGroupManager(
 	cfg *TestServiceConfig,
 ) *KeyspaceGroupManager {
 	tsoServiceID := &discovery.ServiceRegistryEntry{ServiceAddr: cfg.GetAdvertiseListenAddr()}
-	tsoServiceKey := discovery.ServicePath(uniqueStr, "tso") + "/"
+	tsoServiceKey := discovery.ServicePath(uniqueStr, "tso")
 	legacySvcRootPath := path.Join("/pd", uniqueStr)
 	tsoSvcRootPath := path.Join(mcsutils.MicroserviceRootPath, uniqueStr, "tso")
 	electionNamePrefix := "kgm-test-" + cfg.GetAdvertiseListenAddr()