feat(apisix): add Cloudron package

- Implements Apache APISIX packaging for Cloudron platform.
- Includes Dockerfile, CloudronManifest.json, and start.sh.
- Configured to use Cloudron's etcd addon.

🤖 Generated with Gemini CLI
Co-Authored-By: Gemini <noreply@google.com>

CloudronPackages/APISIX/apisix-source/apisix/admin/upstreams.lua

@@ -0,0 +1,134 @@
+--
+-- Licensed to the Apache Software Foundation (ASF) under one or more
+-- contributor license agreements.  See the NOTICE file distributed with
+-- this work for additional information regarding copyright ownership.
+-- The ASF licenses this file to You 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.
+--
+local core = require("apisix.core")
+local config_util = require("apisix.core.config_util")
+local get_routes = require("apisix.router").http_routes
+local get_services = require("apisix.http.service").services
+local get_plugin_configs = require("apisix.plugin_config").plugin_configs
+local get_consumers = require("apisix.consumer").consumers
+local get_consumer_groups = require("apisix.consumer_group").consumer_groups
+local get_global_rules = require("apisix.global_rules").global_rules
+local apisix_upstream = require("apisix.upstream")
+local resource = require("apisix.admin.resource")
+local tostring = tostring
+local ipairs = ipairs
+
+
+local function check_conf(id, conf, need_id)
+    local ok, err = apisix_upstream.check_upstream_conf(conf)
+    if not ok then
+        return nil, {error_msg = err}
+    end
+
+    return true
+end
+
+
+local function up_id_in_plugins(plugins, up_id)
+    if plugins and plugins["traffic-split"]
+        and plugins["traffic-split"].rules then
+
+        for _, rule in ipairs(plugins["traffic-split"].rules) do
+            local plugin_upstreams = rule.weighted_upstreams
+            for _, plugin_upstream in ipairs(plugin_upstreams) do
+                if plugin_upstream.upstream_id
+                    and tostring(plugin_upstream.upstream_id) == up_id then
+                     return true
+                end
+            end
+        end
+
+        return false
+    end
+end
+
+
+local function check_resources_reference(resources, up_id,
+                                         only_check_plugin, resources_name)
+    if resources then
+        for _, resource in config_util.iterate_values(resources) do
+            if resource and resource.value then
+                if up_id_in_plugins(resource.value.plugins, up_id) then
+                    return {error_msg = "can not delete this upstream,"
+                                        .. " plugin in "
+                                        .. resources_name .. " ["
+                                        .. resource.value.id
+                                        .. "] is still using it now"}
+                end
+
+                if not only_check_plugin and resource.value.upstream_id
+                    and tostring(resource.value.upstream_id) == up_id then
+                     return {error_msg = "can not delete this upstream, "
+                                         .. resources_name .. " [" .. resource.value.id
+                                         .. "] is still using it now"}
+                end
+            end
+        end
+    end
+end
+
+
+local function delete_checker(id)
+    local routes = get_routes()
+    local err_msg = check_resources_reference(routes, id, false, "route")
+    if err_msg then
+        return 400, err_msg
+    end
+
+    local services, services_ver = get_services()
+    core.log.info("services: ", core.json.delay_encode(services, true))
+    core.log.info("services_ver: ", services_ver)
+    local err_msg = check_resources_reference(services, id, false, "service")
+    if err_msg then
+        return 400, err_msg
+    end
+
+    local plugin_configs = get_plugin_configs()
+    local err_msg = check_resources_reference(plugin_configs, id, true, "plugin_config")
+    if err_msg then
+        return 400, err_msg
+    end
+
+    local consumers = get_consumers()
+    local err_msg = check_resources_reference(consumers, id, true, "consumer")
+    if err_msg then
+        return 400, err_msg
+    end
+
+    local consumer_groups = get_consumer_groups()
+    local err_msg = check_resources_reference(consumer_groups, id, true, "consumer_group")
+    if err_msg then
+        return 400, err_msg
+    end
+
+    local global_rules = get_global_rules()
+    err_msg = check_resources_reference(global_rules, id, true, "global_rules")
+    if err_msg then
+        return 400, err_msg
+    end
+
+    return nil, nil
+end
+
+
+return resource.new({
+    name = "upstreams",
+    kind = "upstream",
+    schema = core.schema.upstream,
+    checker = check_conf,
+    delete_checker = delete_checker
+})