meta_service & server_state: support set/del/clear envs for app

include/dsn/dist/replication/replication.codes.h

@@ -95,6 +95,7 @@ MAKE_EVENT_CODE(LPC_META_CALLBACK, TASK_PRIORITY_COMMON)
 MAKE_EVENT_CODE(LPC_QUERY_PN_DECREE, TASK_PRIORITY_COMMON)
 MAKE_EVENT_CODE_RPC(RPC_CM_REPORT_RESTORE_STATUS, TASK_PRIORITY_COMMON)
 MAKE_EVENT_CODE_RPC(RPC_CM_QUERY_RESTORE_STATUS, TASK_PRIORITY_COMMON)
+MAKE_EVENT_CODE_RPC(RPC_CM_UPDATE_APP_ENV, TASK_PRIORITY_COMMON)
 #undef CURRENT_THREAD_POOL
 
 #define CURRENT_THREAD_POOL THREAD_POOL_META_STATE

include/dsn/dist/replication/replication.types.h

@@ -72,5 +72,7 @@ namespace dsn { namespace replication {
     GENERATED_TYPE_SERIALIZATION(configuration_report_restore_status_response, THRIFT)
     GENERATED_TYPE_SERIALIZATION(configuration_query_restore_request, THRIFT)
     GENERATED_TYPE_SERIALIZATION(configuration_query_restore_response, THRIFT)
+    GENERATED_TYPE_SERIALIZATION(configuration_update_app_env_request, THRIFT)
+    GENERATED_TYPE_SERIALIZATION(configuration_update_app_env_response, THRIFT)
 
 } } 

include/dsn/dist/replication/replication_ddl_client.h

@@ -156,6 +156,16 @@ class replication_ddl_client : public clientlet
                                          int32_t backup_history_count_to_keep = 0,
                                          const std::string &start_time = std::string());
 
+    dsn::error_code set_app_envs(const std::string &app_name,
+                                 const std::vector<std::string> &keys,
+                                 const std::vector<std::string> &values);
+    dsn::error_code del_app_envs(const std::string &app_name, const std::vector<std::string> &keys);
+    // precondition:
+    //  -- if clear_all = true, just ignore prefix
+    //  -- if clear_all = false, then prefix must not be empty
+    dsn::error_code
+    clear_app_envs(const std::string &app_name, bool clear_all, const std::string &prefix);
+
 private:
     bool static valid_app_char(int c);