tests: plugin_alias: Add internal tests for handling plugin aliases

Signed-off-by: Hiroshi Hatake <hiroshi@chronosphere.io>

Author: cosmo0920

tests/internal/CMakeLists.txt

@@ -53,6 +53,7 @@ set(UNIT_TESTS_FILES
   endianness.c
   task_map.c
   strptime.c
+  plugin_alias.c
   storage_inherit.c
   unicode.c
   opentelemetry.c

tests/internal/plugin_alias.c

@@ -0,0 +1,130 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015-2026 The Fluent Bit Authors
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#include <fluent-bit/flb_info.h>
+#include <fluent-bit/flb_mem.h>
+#include <fluent-bit/flb_plugin.h>
+#include <fluent-bit/flb_plugin_alias.h>
+#include <fluent-bit/flb_network.h>
+#include <fluent-bit/flb_config.h>
+#include <fluent-bit/flb_output.h>
+
+#include <string.h>
+
+#include "flb_tests_internal.h"
+
+void plugin_alias_lookup_test()
+{
+    const char *alias_target;
+
+    alias_target = flb_plugin_alias_get(FLB_PLUGIN_OUTPUT, "elasticsearch",
+                                        strlen("elasticsearch"));
+    if (!TEST_CHECK(alias_target != NULL)) {
+        TEST_MSG("output plugin alias was not resolved");
+        return;
+    }
+
+    if (!TEST_CHECK(strcmp(alias_target, "es") == 0)) {
+        TEST_MSG("unexpected alias target: %s", alias_target);
+    }
+}
+
+void plugin_alias_rewrite_test()
+{
+    char *rewritten_name;
+
+    rewritten_name = flb_plugin_alias_rewrite(FLB_PLUGIN_OUTPUT,
+                                              "elasticsearch://127.0.0.1:9200");
+    if (!TEST_CHECK(rewritten_name != FLB_PLUGIN_ALIAS_ERR)) {
+        TEST_MSG("error while rewriting output plugin alias");
+        return;
+    }
+    if (!TEST_CHECK(rewritten_name != NULL)) {
+        TEST_MSG("could not rewrite output plugin alias");
+        return;
+    }
+
+    if (!TEST_CHECK(strcmp(rewritten_name, "es://127.0.0.1:9200") == 0)) {
+        TEST_MSG("unexpected rewritten output plugin name: %s", rewritten_name);
+    }
+
+    flb_free(rewritten_name);
+}
+
+void network_alias_address_parse_test()
+{
+    int ret;
+    struct flb_net_host host;
+
+    ret = flb_net_host_set("es", &host, "elasticsearch://127.0.0.1:9200/path");
+    if (!TEST_CHECK(ret == 0)) {
+        TEST_MSG("could not parse alias output address");
+        return;
+    }
+
+    if (!TEST_CHECK(strcmp(host.name, "127.0.0.1") == 0)) {
+        TEST_MSG("unexpected host name parsed from alias output address: %s",
+                 host.name);
+    }
+
+    if (!TEST_CHECK(host.port == 9200)) {
+        TEST_MSG("unexpected host port parsed from alias output address: %d",
+                 host.port);
+    }
+
+    flb_sds_destroy(host.name);
+    flb_sds_destroy(host.listen);
+    flb_uri_destroy(host.uri);
+    flb_sds_destroy(host.address);
+}
+
+void output_alias_instantiation_test()
+{
+    struct flb_config *config;
+    struct flb_output_instance *instance;
+
+    config = flb_config_init();
+    if (!TEST_CHECK(config != NULL)) {
+        TEST_MSG("could not initialize config context");
+        return;
+    }
+
+    instance = flb_output_new(config, "elasticsearch", NULL, FLB_TRUE);
+    if (!TEST_CHECK(instance != NULL)) {
+        TEST_MSG("could not instantiate aliased output plugin");
+        flb_config_exit(config);
+        return;
+    }
+
+    if (!TEST_CHECK(strcmp(instance->p->name, "es") == 0)) {
+        TEST_MSG("unexpected output plugin instantiated for alias: %s",
+                 instance->p->name);
+    }
+
+    flb_output_instance_destroy(instance);
+    flb_config_exit(config);
+}
+
+TEST_LIST = {
+    { "plugin_alias_lookup_test", plugin_alias_lookup_test },
+    { "plugin_alias_rewrite_test", plugin_alias_rewrite_test },
+    { "network_alias_address_parse_test", network_alias_address_parse_test },
+    { "output_alias_instantiation_test", output_alias_instantiation_test },
+    { 0 }
+};