Fix explicit server allocation

The test cases allocated servers in a way that doesn't comfortably suit
the way the servers are now allocated. Adding a helper C++ class to load
module defaults makes it easier to do explicit server initialization in
tests.

The binlogrouter was also fixed in this commit as it uses servers much
like a test would use.

include/maxscale/config.hh

@@ -0,0 +1,38 @@
+#pragma once
+/*
+ * Copyright (c) 2016 MariaDB Corporation Ab
+ *
+ * Use of this software is governed by the Business Source License included
+ * in the LICENSE.TXT file and at www.mariadb.com/bsl11.
+ *
+ * Change Date: 2022-01-01
+ *
+ * On the date above, in accordance with the Business Source License, use
+ * of this software will be governed by version 2 or later of the General
+ * Public License.
+ */
+
+#include <maxscale/config.h>
+
+namespace maxscale
+{
+
+// Helper class for allocating temporary configuration parameters
+class ParamList
+{
+public:
+    ParamList(const ParamList&) = delete;
+    ParamList& operator=(const ParamList&) = delete;
+
+    ParamList(std::initializer_list<std::pair<const char*, const char*>> list,
+              const MXS_MODULE_PARAM* module_params = NULL);
+
+    ~ParamList();
+
+    MXS_CONFIG_PARAMETER* params();
+
+private:
+    CONFIG_CONTEXT m_ctx = {(char*)""};
+};
+
+}

server/core/config.cc

@@ -16,6 +16,7 @@
  */
 
 #include <maxscale/config.h>
+#include <maxscale/config.hh>
 
 #include <ctype.h>
 #include <ftw.h>
@@ -4309,3 +4310,32 @@ bool config_parse_disk_space_threshold(MxsDiskSpaceThreshold* pDisk_space_thresh
 
     return success;
 }
+
+namespace maxscale
+{
+
+ParamList::ParamList(std::initializer_list<std::pair<const char*, const char*>> list,
+                     const MXS_MODULE_PARAM* module_params)
+{
+    for (auto&& a : list)
+    {
+        config_add_param(&m_ctx, a.first, a.second);
+    }
+
+    if (module_params)
+    {
+        config_add_defaults(&m_ctx, module_params);
+    }
+}
+
+ParamList::~ParamList()
+{
+    config_parameter_free(m_ctx.parameters);
+}
+
+MXS_CONFIG_PARAMETER* ParamList::params()
+{
+    return m_ctx.parameters;
+}
+
+}

server/core/test/test_server.cc

@@ -37,11 +37,20 @@
 #include <maxscale/server.h>
 #include <maxscale/log_manager.h>
 #include <maxscale/paths.h>
+#include <maxscale/config.hh>
 
 // This is pretty ugly but it's required to test internal functions
 #include "../config.cc"
 #include "../server.cc"
 
+static mxs::ParamList params(
+{
+    {"address", "127.0.0.1"},
+    {"port", "9876"},
+    {"protocol", "HTTPD"},
+    {"authenticator", "NullAuthAllow"}
+}, config_server_params);
+
 /**
  * test1    Allocate a server and do lots of other things
  *
@@ -55,14 +64,10 @@ test1()
 
     /* Server tests */
     ss_dfprintf(stderr, "testserver : creating server called MyServer");
-    set_libdir(MXS_STRDUP_A("../../modules/authenticator/NullAuthAllow/"));
-    server = server_alloc("uniquename", "127.0.0.1", 9876, "HTTPD", "NullAuthAllow");
+    server = server_alloc("uniquename", params.params());
     ss_info_dassert(server, "Allocating the server should not fail");
     mxs_log_flush_sync();
 
-    //ss_info_dassert(NULL != service, "New server with valid protocol and port must not be null");
-    //ss_info_dassert(0 != service_isvalid(service), "Service must be valid after creation");
-
     char buf[120];
     ss_dfprintf(stderr, "\t..done\nTest Parameter for Server.");
     ss_info_dassert(!server_get_parameter(server, "name", buf, sizeof(buf)), "Parameter should be null when not set");
@@ -123,6 +128,7 @@ bool test_load_config(const char *input, SERVER *server)
         {
             CONFIG_CONTEXT *obj = ccontext.next;
             MXS_CONFIG_PARAMETER *param = obj->parameters;
+            config_add_defaults(obj, config_server_params);
 
             TEST(strcmp(obj->object, server->name) == 0, "Server names differ");
             TEST(strcmp(server->address, config_get_param(param, "address")->value) == 0, "Server addresses differ");
@@ -130,7 +136,7 @@ bool test_load_config(const char *input, SERVER *server)
             TEST(strcmp(server->authenticator, config_get_param(param, "authenticator")->value) == 0,
                  "Server authenticators differ");
             TEST(server->port == atoi(config_get_param(param, "port")->value), "Server ports differ");
-            TEST(create_new_server(obj) == 0, "Failed to create server from loaded config");
+            TEST(server_alloc(obj->object, obj->parameters), "Failed to create server from loaded config");
             duplicate_context_finish(&dcontext);
             config_context_free(obj);
         }
@@ -146,7 +152,7 @@ bool test_serialize()
     char old_config_name[] = "serialized-server.cnf.old";
     char *persist_dir = MXS_STRDUP_A("./");
     set_config_persistdir(persist_dir);
-    SERVER *server = server_alloc(name, "127.0.0.1", 9876, "HTTPD", "NullAuthAllow");
+    SERVER *server = server_alloc(name, params.params());
     TEST(server, "Server allocation failed");
 
     /** Make sure the files don't exist */
@@ -178,6 +184,16 @@ bool test_serialize()
 
 int main(int argc, char **argv)
 {
+    /**
+     * Prepare test environment by pre-loading modules. This prevents the server
+     * allocation from failing if multiple modules from different directories are
+     * loaded in one core function call.
+     */
+    set_libdir(MXS_STRDUP_A("../../modules/authenticator/NullAuthAllow/"));
+    load_module("NullAuthAllow", MODULE_AUTHENTICATOR);
+    set_libdir(MXS_STRDUP_A("../../modules/protocol/HTTPD/"));
+    load_module("HTTPD", MODULE_PROTOCOL);
+
     int result = 0;
 
     result += test1();

server/modules/routing/binlogrouter/blr.cc

@@ -38,6 +38,7 @@
 
 #include <maxscale/alloc.h>
 #include <maxscale/atomic.h>
+#include <maxscale/config.hh>
 #include <maxscale/dcb.h>
 #include <maxscale/housekeeper.h>
 #include <maxscale/log_manager.h>
@@ -762,12 +763,19 @@ static MXS_ROUTER* createInstance(SERVICE *service, MXS_CONFIG_PARAMETER* params
     /* Dynamically allocate master_host server struct, not written in any cnf file */
     if (service->dbref == NULL)
     {
-        SERVER *server;
-        SSL_LISTENER *ssl_cfg;
-        server = server_alloc("binlog_router_master_host",
-                              "_none_", 3306,
-                              "MySQLBackend",
-                              "MySQLBackendAuth");
+        // Declared in config.cc and needs to be removed if/when blr is refactored
+        extern const MXS_MODULE_PARAM config_server_params[];
+
+        mxs::ParamList p(
+        {
+            {"address", "_none_"},
+            {"port", "3306"},
+            {"protocol", "MySQLBackend"},
+            {"authenticator", "MySQLBackendAuth"}
+        }, config_server_params);
+
+        SERVER* server = server_alloc("binlog_router_master_host", p.params());
+
         if (server == NULL)
         {
             MXS_ERROR("%s: Error for server_alloc in createInstance",

server/modules/routing/binlogrouter/test/testbinlog.cc

@@ -52,6 +52,7 @@
 
 // This isn't really a clean way of testing
 #include "../../../../core/internal/service.h"
+#include <maxscale/config.hh>
 
 static void printVersion(const char *progname);
 static void printUsage(const char *progname);
@@ -126,8 +127,18 @@ int main(int argc, char **argv)
         service_add_parameters(service, &p);
     }
 
-    SERVER* server = server_alloc("binlog_router_master_host", "_none_", 3306,
-                          "MySQLBackend", "MySQLBackendAuth");
+    // Declared in config.cc and needs to be removed if/when blr is refactored
+    extern const MXS_MODULE_PARAM config_server_params[];
+
+    mxs::ParamList p(
+    {
+        {"address", "_none_"},
+        {"port", "3306"},
+        {"protocol", "MySQLBackend"},
+        {"authenticator", "MySQLBackendAuth"}
+    }, config_server_params);
+
+    SERVER* server = server_alloc("binlog_router_master_host", p.params());
     if (server == NULL)
     {
         printf("Failed to allocate 'server' object\n");