feat: add discovery k8s dump data interface

apisix/discovery/kubernetes/init.lua

@@ -615,4 +615,46 @@ function _M.init_worker()
     end
 end
 
+
+function _M.dump_data()
+
+    local eps = {}
+    for _, conf in ipairs(local_conf.discovery.kubernetes) do
+
+        local id = conf.id
+        local endpoint_dict = get_endpoint_dict(id)
+        local keys, err = endpoint_dict:get_keys()
+        if err then
+            error(err)
+            break
+        end
+
+        if keys then
+            local k8s = {}
+            for i = 1, #keys do
+
+                local key = keys[i]
+                --skip key with suffix #version
+                if key:sub(-#"#version") ~= "#version" then
+                    local value = endpoint_dict:get(key)
+
+                    core.table.insert(k8s, {
+                        name = key,
+                        value = value
+                    })
+                end
+            end
+
+            core.table.insert(eps, {
+                id = conf.id,
+                endpoints = k8s
+            })
+
+        end
+    end
+
+    return {config = local_conf.discovery.kubernetes, endpoints = eps}
+end
+
+
 return _M

docs/en/latest/discovery/kubernetes.md

@@ -351,3 +351,57 @@ A: Assume your [_ServiceAccount_](https://kubernetes.io/docs/tasks/configure-pod
  ```shell
  kubectl -n apisix get secret kubernetes-discovery-token-c64cv -o jsonpath={.data.token} | base64 -d
  ```
+
+## Debugging API
+
+It also offers control api for debugging.
+
+### Memory Dump API
+
+To query/list the nodes discoverd by kubernetes discovery, you can query the /v1/discovery/kubernetes/dump control API endpoint like so:
+
+```shell
+GET /v1/discovery/kubernetes/dump
+```
+
+Which will yield the following response:
+
+```shell
+# curl http://127.0.0.1:9090/v1/discovery/kubernetes/dump | jq
+{
+  "endpoints": [
+    {
+      "endpoints": [
+        {
+          "value": "{\"https\":[{\"host\":\"172.18.164.170\",\"port\":6443,\"weight\":50},{\"host\":\"172.18.164.171\",\"port\":6443,\"weight\":50},{\"host\":\"172.18.164.172\",\"port\":6443,\"weight\":50}]}",
+          "name": "default/kubernetes"
+        },
+        {
+          "value": "{\"metrics\":[{\"host\":\"172.18.164.170\",\"port\":2379,\"weight\":50},{\"host\":\"172.18.164.171\",\"port\":2379,\"weight\":50},{\"host\":\"172.18.164.172\",\"port\":2379,\"weight\":50}]}",
+          "name": "kube-system/etcd"
+        },
+        {
+          "value": "{\"http-85\":[{\"host\":\"172.64.89.2\",\"port\":85,\"weight\":50}]}",
+          "name": "test-ws/testing"
+        }
+      ],
+      "id": "first"
+    }
+  ],
+  "config": [
+    {
+      "default_weight": 50,
+      "id": "first",
+      "client": {
+        "token": "xxx"
+      },
+      "service": {
+        "host": "172.18.164.170",
+        "port": "6443",
+        "schema": "https"
+      },
+      "shared_size": "1m"
+    }
+  ]
+}
+```

docs/zh/latest/discovery/kubernetes.md

@@ -349,3 +349,55 @@ A: 假定你指定的 [_ServiceAccount_](https://kubernetes.io/docs/tasks/config
  ```shell
  kubectl -n apisix get secret kubernetes-discovery-token-c64cv -o jsonpath={.data.token} | base64 -d
  ```
+
+## 调试 API
+
+它还提供了用于调试的控制 api。
+
+### 内存 Dump API
+
+```shell
+GET /v1/discovery/kubernetes/dump
+```
+
+例子
+
+```shell
+# curl http://127.0.0.1:9090/v1/discovery/kubernetes/dump | jq
+{
+  "endpoints": [
+    {
+      "endpoints": [
+        {
+          "value": "{\"https\":[{\"host\":\"172.18.164.170\",\"port\":6443,\"weight\":50},{\"host\":\"172.18.164.171\",\"port\":6443,\"weight\":50},{\"host\":\"172.18.164.172\",\"port\":6443,\"weight\":50}]}",
+          "name": "default/kubernetes"
+        },
+        {
+          "value": "{\"metrics\":[{\"host\":\"172.18.164.170\",\"port\":2379,\"weight\":50},{\"host\":\"172.18.164.171\",\"port\":2379,\"weight\":50},{\"host\":\"172.18.164.172\",\"port\":2379,\"weight\":50}]}",
+          "name": "kube-system/etcd"
+        },
+        {
+          "value": "{\"http-85\":[{\"host\":\"172.64.89.2\",\"port\":85,\"weight\":50}]}",
+          "name": "test-ws/testing"
+        }
+      ],
+      "id": "first"
+    }
+  ],
+  "config": [
+    {
+      "default_weight": 50,
+      "id": "first",
+      "client": {
+        "token": "xxx"
+      },
+      "service": {
+        "host": "172.18.164.170",
+        "port": "6443",
+        "schema": "https"
+      },
+      "shared_size": "1m"
+    }
+  ]
+}
+```

t/kubernetes/discovery/kubernetes3.t

@@ -187,6 +187,13 @@ _EOC_
                         core.log.err("operator k8s cluster error: ", err)
                         return 500
                     end
+
+                    ngx.sleep(1)
+
+                    local k8s = require("apisix.discovery.kubernetes")
+                    local data = k8s.dump_data()
+                    ngx.say(core.json.encode(data,true))
+
                     if res.status ~= 200 and res.status ~= 201 and res.status ~= 409 then
                         return res.status
                     end
@@ -195,6 +202,29 @@ _EOC_
             }
         }
 
+        location /dump {
+            content_by_lua_block {
+                local json_decode = require("toolkit.json").decode
+                local core = require("apisix.core")
+                local http = require "resty.http"
+                local httpc = http.new()
+
+                ngx.sleep(1)
+
+                local dump_uri = "http://127.0.0.1:" .. ngx.var.server_port .. "/v1/discovery/kubernetes/dump"
+                local res, err = httpc:request_uri(dump_uri, { method = "GET"})
+                if err then
+                    ngx.log(ngx.ERR, err)
+                    ngx.status = res.status
+                    return
+                end
+
+                local body = json_decode(res.body)
+                local endpoints = body.endpoints
+                ngx.say(core.json.encode(endpoints,true))
+            }
+        }
+
 _EOC_
 
     $block->set_value("config", $config);
@@ -332,6 +362,8 @@ POST /operators
 ]
 --- more_headers
 Content-type: application/json
+--- response_body_like
+.*"name":"default/kubernetes".*
 
 
 
@@ -386,3 +418,12 @@ GET /queries
 Content-type: application/json
 --- response_body eval
 qr{ 0 0 2 2 0 0 0 0 2 2 0 0 }
+
+
+
+=== TEST 4: test dump
+--- yaml_config eval: $::yaml_config
+--- request
+GET /dump
+--- response_body_like
+.*"name":"default/kubernetes".*