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

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
@@ -332,6 +339,8 @@ POST /operators
 ]
 --- more_headers
 Content-type: application/json
+--- response_body_like
+.*"endpoints".*