Merge pull request #1019 from Mashape/chore/serf

Improving the performance of Serf

.luacheckrc

@@ -1,6 +1,6 @@
 redefined = false
 unused_args = false
-globals = {"ngx", "dao", "app", "configuration", "events"}
+globals = {"ngx", "dao", "app", "configuration", "events", "serf"}
 
 files["kong/"] = {
   std = "luajit"

kong/api/routes/cluster.lua

@@ -1,5 +1,4 @@
 local responses = require "kong.tools.responses"
-local Serf = require "kong.cli.services.serf"
 
 local pairs = pairs
 local table_insert = table.insert
@@ -8,7 +7,7 @@ local string_upper = string.upper
 return {
   ["/cluster/"] = {
     GET = function(self, dao_factory, helpers)
-      local members, err = Serf(configuration):_members()
+      local members, err = serf:_members()
       if err then
         return responses.send_HTTP_INTERNAL_SERVER_ERROR(err)
       end
@@ -33,7 +32,7 @@ return {
         return responses.send_HTTP_BAD_REQUEST("Missing node \"name\"")
       end
 
-      local _, err = Serf(configuration):invoke_signal("force-leave", {self.params.name})
+      local _, err = serf:invoke_signal("force-leave", {self.params.name})
       if err then
         return responses.send_HTTP_BAD_REQUEST(err)
       end
@@ -46,7 +45,7 @@ return {
         return responses.send_HTTP_BAD_REQUEST("Missing node \"address\"")
       end
 
-      local _, err = Serf(configuration):invoke_signal("join", {self.params.address})
+      local _, err = serf:invoke_signal("join", {self.params.address})
       if err then
         return responses.send_HTTP_BAD_REQUEST(err)
       end

kong/cli/services/base_service.lua

@@ -68,11 +68,14 @@ function BaseService:is_running()
 end
 
 function BaseService:_get_cmd(additional_paths, check_path_func)
-  local cmd = BaseService.find_cmd(self._name, additional_paths, check_path_func)
-  if not cmd then
-    return nil, "Can't find "..self._name
+  if not self._cmd then -- Cache the command after the first time
+    local cmd = BaseService.find_cmd(self._name, additional_paths, check_path_func)
+    if not cmd then
+      return nil, "Can't find "..self._name
+    end
+    self._cmd = cmd
   end
-  return cmd
+  return self._cmd
 end
 
 function BaseService:start()

kong/cli/services/serf.lua

@@ -257,7 +257,7 @@ function Serf:event(t_payload)
     return false, "Encoded payload is "..string.len(encoded_payload).." and it exceeds the limit of 512 bytes!"
   end 
 
-  return self:invoke_signal("event "..tostring(args).." kong", {"'"..encoded_payload.."'"}, true)
+  return self:invoke_signal("event "..tostring(args).." kong", {"'"..encoded_payload.."'", "&"}, true)
 end
 
 function Serf:stop()

kong/core/cluster.lua

@@ -1,5 +1,4 @@
 local cluster_utils = require "kong.tools.cluster"
-local Serf = require "kong.cli.services.serf"
 local cache = require "kong.tools.database_cache"
 
 local resty_lock
@@ -38,7 +37,6 @@ local function async_autojoin(premature)
     if err then
       ngx.log(ngx.ERR, tostring(err))
     elseif count > 1 then
-      local serf = Serf(configuration)
       local members, err = serf:_members()
       if err then
         ngx.log(ngx.ERR, tostring(err))

kong/core/hooks.lua

@@ -1,7 +1,6 @@
 local events = require "kong.core.events"
 local cache = require "kong.tools.database_cache"
 local stringy = require "stringy"
-local Serf = require "kong.cli.services.serf"
 
 local function invalidate_plugin(entity)
   cache.delete(cache.plugin_key(entity.name, entity.api_id, entity.consumer_id))
@@ -22,7 +21,6 @@ local function invalidate(message_t)
 end
 
 local function get_cluster_members()
-  local serf = require("kong.cli.services.serf")(configuration)
   local members, err = serf:_members()
   if err then
     ngx.log(ngx.ERR, err)
@@ -128,11 +126,7 @@ return {
     invalidate(message_t)
   end,
   [events.TYPES.CLUSTER_PROPAGATE] = function(message_t)
-    local serf = Serf(configuration)
-    local ok, err = serf:event(message_t)
-    if not ok then
-      ngx.log(ngx.ERR, err)
-    end
+    serf:event(message_t)
   end,
   [events.TYPES["MEMBER-JOIN"]] = function(message_t)
     member_join(message_t)

kong/kong.lua

@@ -30,6 +30,7 @@ local dao_loader = require "kong.tools.dao_loader"
 local config_loader = require "kong.tools.config_loader"
 local plugins_iterator = require "kong.core.plugins_iterator"
 local Events = require "kong.core.events"
+local Serf = require "kong.cli.services.serf"
 
 local ipairs = ipairs
 local table_insert = table.insert
@@ -127,6 +128,7 @@ local Kong = {}
 function Kong.init()
   local status, err = pcall(function() 
       configuration = config_loader.load(os.getenv("KONG_CONF"))
+      serf = Serf(configuration)
       events = Events()
       dao = dao_loader.load(configuration, true, events)
       loaded_plugins = load_node_plugins(configuration)