fix(etcd): reuse cli and enable keepalive (apache#9420)

apisix/cli/snippet.lua

@@ -28,6 +28,9 @@ upstream apisix_conf_backend {
         local conf_server = require("apisix.conf_server")
         conf_server.balancer()
     }
+    keepalive 320;
+    keepalive_requests 1000;
+    keepalive_timeout 60s;
 }
 
 {% if trusted_ca_cert then %}

apisix/core/etcd.lua

@@ -372,9 +372,7 @@ do
                 return nil, nil, err
             end
 
-            if tmp_etcd_cli.use_grpc then
-                etcd_cli = tmp_etcd_cli
-            end
+            etcd_cli = tmp_etcd_cli
 
             return tmp_etcd_cli, prefix
         end

t/core/config_etcd.t

@@ -266,7 +266,6 @@ qr/etcd auth failed/
 etcd auth failed
 etcd auth failed
 etcd auth failed
-etcd auth failed
 
 
 

t/core/etcd.t

@@ -401,35 +401,3 @@ qr/init_by_lua:\d+: \S+/
 init_by_lua:12: ab
 init_by_lua:19: 200
 init_by_lua:26: 404
-
-
-
-=== TEST 8: error handling in server_version
---- yaml_config
-deployment:
-  role: traditional
-  role_traditional:
-    config_provider: etcd
-  etcd:
-    host:
-      - "http://127.0.0.1:2379"
-    prefix: "/apisix"
---- config
-    location /t {
-        content_by_lua_block {
-            local etcd_lib = require("resty.etcd")
-            -- the mock won't take effect when using gRPC because the connection will be cached
-            etcd_lib.new = function()
-                return nil, "ouch"
-            end
-            local etcd = require("apisix.core.etcd")
-            local res, err = etcd.server_version()
-            ngx.say(err)
-        }
-    }
---- request
-GET /t
---- response_body
-ouch
---- error_log
-failed to get server_info from etcd