Revert "feat(testing): add reconfiguration completion detection mecha…

…nism"

This reverts commit 3a7bc16.

kong/clustering/config_helper.lua

@@ -202,12 +202,7 @@ local function fill_empty_hashes(hashes)
   end
 end
 
-function _M.update(declarative_config, msg)
-
-  local config_table = msg.config_table
-  local config_hash = msg.config_hash
-  local hashes = msg.hashes
-
+function _M.update(declarative_config, config_table, config_hash, hashes)
   assert(type(config_table) == "table")
 
   if not config_hash then
@@ -241,13 +236,11 @@ function _M.update(declarative_config, msg)
   -- executed by worker 0
 
   local res
-  res, err = declarative.load_into_cache_with_events(entities, meta, new_hash, hashes, msg.current_transaction_id)
+  res, err = declarative.load_into_cache_with_events(entities, meta, new_hash, hashes)
   if not res then
     return nil, err
   end
 
-  ngx_log(ngx.NOTICE, "loaded configuration with transaction ID " .. msg.current_transaction_id)
-
   return true
 end
 

kong/clustering/control_plane.lua

@@ -11,7 +11,6 @@ local compat = require("kong.clustering.compat")
 local constants = require("kong.constants")
 local events = require("kong.clustering.events")
 local calculate_config_hash = require("kong.clustering.config_helper").calculate_config_hash
-local global = require("kong.global")
 
 
 local string = string
@@ -116,10 +115,8 @@ function _M:export_deflated_reconfigure_payload()
 
   local config_hash, hashes = calculate_config_hash(config_table)
 
-  local current_transaction_id = global.get_current_transaction_id()
   local payload = {
     type = "reconfigure",
-    current_transaction_id = current_transaction_id,
     timestamp = ngx_now(),
     config_table = config_table,
     config_hash = config_hash,
@@ -146,8 +143,6 @@ function _M:export_deflated_reconfigure_payload()
   self.current_config_hash = config_hash
   self.deflated_reconfigure_payload = payload
 
-  ngx_log(ngx_NOTICE, "exported configuration with transaction id " .. current_transaction_id)
-
   return payload, nil, config_hash
 end
 

kong/clustering/data_plane.lua

@@ -213,7 +213,10 @@ function _M:communicate(premature)
                          msg.timestamp and " with timestamp: " .. msg.timestamp or "",
                          log_suffix)
 
-      local pok, res, err = pcall(config_helper.update, self.declarative_config, msg)
+      local config_table = assert(msg.config_table)
+
+      local pok, res, err = pcall(config_helper.update, self.declarative_config,
+                                  config_table, msg.config_hash, msg.hashes)
       if pok then
         ping_immediately = true
       end

kong/db/declarative/import.lua

@@ -507,7 +507,7 @@ do
   local DECLARATIVE_LOCK_KEY = "declarative:lock"
 
   -- make sure no matter which path it exits, we released the lock.
-  load_into_cache_with_events = function(entities, meta, hash, hashes, transaction_id)
+  load_into_cache_with_events = function(entities, meta, hash, hashes)
     local kong_shm = ngx.shared.kong
 
     local ok, err = kong_shm:add(DECLARATIVE_LOCK_KEY, 0, DECLARATIVE_LOCK_TTL)
@@ -522,11 +522,6 @@ do
     end
 
     ok, err = load_into_cache_with_events_no_lock(entities, meta, hash, hashes)
-
-    if ok and transaction_id then
-      ok, err = kong_shm:set("declarative:current-transaction-id", transaction_id)
-    end
-
     kong_shm:delete(DECLARATIVE_LOCK_KEY)
 
     return ok, err

kong/db/strategies/postgres/connector.lua

@@ -519,11 +519,10 @@ function _mt:query(sql, operation)
   end
 
   local phase = get_phase()
-  local in_admin_api = phase == "content" and ngx.ctx.KONG_PHASE == ADMIN_API_PHASE
 
   if not operation or
-          not self.config_ro or
-          in_admin_api
+     not self.config_ro or
+     (phase == "content" and ngx.ctx.KONG_PHASE == ADMIN_API_PHASE)
   then
     -- admin API requests skips the replica optimization
     -- to ensure all its results are always strongly consistent
@@ -553,9 +552,6 @@ function _mt:query(sql, operation)
 
   res, err, partial, num_queries = conn:query(sql)
 
-  if in_admin_api and operation == "write" and res and res[1] and res[1]._pg_transaction_id then
-    kong.response.set_header('X-Kong-Transaction-ID', res[1]._pg_transaction_id)
-  end
   -- if err is string then either it is a SQL error
   -- or it is a socket error, here we abort connections
   -- that encounter errors instead of reusing them, for

kong/db/strategies/postgres/init.lua

@@ -987,8 +987,6 @@ function _M.new(connector, schema, errors)
     insert(upsert_expressions, ttl_escaped .. " = "  .. "EXCLUDED." .. ttl_escaped)
   end
 
-  insert(select_expressions, "pg_current_xact_id() as _pg_transaction_id")
-
   local primary_key_escaped = {}
   for i, key in ipairs(primary_key) do
     local primary_key_field = primary_key_fields[key]

kong/global.lua

@@ -68,8 +68,7 @@ end
 
 
 local _GLOBAL = {
-  phases                 = phase_checker.phases,
-  CURRENT_TRANSACTION_ID = 0,
+  phases = phase_checker.phases,
 }
 
 
@@ -295,14 +294,4 @@ function _GLOBAL.init_timing()
 end
 
 
-function _GLOBAL.get_current_transaction_id()
-  local rows, err = kong.db.connector:query("select pg_current_xact_id() as _pg_transaction_id")
-  if not rows then
-    return nil, "could not query postgres for current transaction id: " .. err
-  else
-    return tonumber(rows[1]._pg_transaction_id)
-  end
-end
-
-
 return _GLOBAL

kong/runloop/handler.lua

@@ -13,7 +13,8 @@ local concurrency  = require "kong.concurrency"
 local lrucache     = require "resty.lrucache"
 local ktls         = require "resty.kong.tls"
 local request_id   = require "kong.tracing.request_id"
-local global       = require "kong.global"
+
+
 
 
 local PluginsIterator = require "kong.runloop.plugins_iterator"
@@ -747,8 +748,6 @@ do
         wasm.set_state(wasm_state)
       end
 
-      global.CURRENT_TRANSACTION_ID = kong_shm:get("declarative:current-transaction-id") or 0
-
       return true
     end)  -- concurrency.with_coroutine_mutex
 
@@ -766,6 +765,11 @@ do
 end
 
 
+local function register_events()
+  events.register_events(reconfigure_handler)
+end
+
+
 local balancer_prepare
 do
   local function sleep_once_for_balancer_init()
@@ -917,7 +921,7 @@ return {
         return
       end
 
-      events.register_events(reconfigure_handler)
+      register_events()
 
       -- initialize balancers for active healthchecks
       timer_at(0, function()
@@ -963,59 +967,84 @@ return {
       if strategy ~= "off" then
         local worker_state_update_frequency = kong.configuration.worker_state_update_frequency or 1
 
-        local function rebuild_timer(premature)
+        local router_async_opts = {
+          name = "router",
+          timeout = 0,
+          on_timeout = "return_true",
+        }
+
+        local function rebuild_router_timer(premature)
           if premature then
             return
           end
 
-          -- Before rebuiding the internal structures, retrieve the current PostgreSQL transaction ID to make it the
-          -- current transaction ID after the rebuild has finished.
-          local rebuild_transaction_id, err = global.get_current_transaction_id()
-          if not rebuild_transaction_id then
-            log(ERR, err)
+          -- Don't wait for the semaphore (timeout = 0) when updating via the
+          -- timer.
+          -- If the semaphore is locked, that means that the rebuild is
+          -- already ongoing.
+          local ok, err = rebuild_router(router_async_opts)
+          if not ok then
+            log(ERR, "could not rebuild router via timer: ", err)
           end
+        end
 
-          local router_update_status, err = rebuild_router({
-            name = "router",
-            timeout = 0,
-            on_timeout = "return_true",
-          })
-          if not router_update_status then
-            log(ERR, "could not rebuild router via timer: ", err)
+        local _, err = kong.timer:named_every("router-rebuild",
+                                         worker_state_update_frequency,
+                                         rebuild_router_timer)
+        if err then
+          log(ERR, "could not schedule timer to rebuild router: ", err)
+        end
+
+        local plugins_iterator_async_opts = {
+          name = "plugins_iterator",
+          timeout = 0,
+          on_timeout = "return_true",
+        }
+
+        local function rebuild_plugins_iterator_timer(premature)
+          if premature then
+            return
           end
 
-          local plugins_iterator_update_status, err = rebuild_plugins_iterator({
-            name = "plugins_iterator",
-            timeout = 0,
-            on_timeout = "return_true",
-          })
-          if not plugins_iterator_update_status then
+          local _, err = rebuild_plugins_iterator(plugins_iterator_async_opts)
+          if err then
             log(ERR, "could not rebuild plugins iterator via timer: ", err)
           end
+        end
 
-          if wasm.enabled() then
-            local wasm_update_status, err = rebuild_wasm_state({
-              name = "wasm",
-              timeout = 0,
-              on_timeout = "return_true",
-            })
-            if not wasm_update_status then
+        local _, err = kong.timer:named_every("plugins-iterator-rebuild",
+                                         worker_state_update_frequency,
+                                         rebuild_plugins_iterator_timer)
+        if err then
+          log(ERR, "could not schedule timer to rebuild plugins iterator: ", err)
+        end
+
+
+        if wasm.enabled() then
+          local wasm_async_opts = {
+            name = "wasm",
+            timeout = 0,
+            on_timeout = "return_true",
+          }
+
+          local function rebuild_wasm_filter_chains_timer(premature)
+            if premature then
+              return
+            end
+
+            local _, err = rebuild_wasm_state(wasm_async_opts)
+            if err then
               log(ERR, "could not rebuild wasm filter chains via timer: ", err)
             end
           end
 
-          if rebuild_transaction_id then
-            log(NOTICE, "configuration processing completed for transaction ID " .. rebuild_transaction_id)
-            global.CURRENT_TRANSACTION_ID = rebuild_transaction_id
+          local _, err = kong.timer:named_every("wasm-filter-chains-rebuild",
+                                           worker_state_update_frequency,
+                                           rebuild_wasm_filter_chains_timer)
+          if err then
+            log(ERR, "could not schedule timer to rebuild wasm filter chains: ", err)
           end
         end
-
-        local _, err = kong.timer:named_every("rebuild",
-                                         worker_state_update_frequency,
-                                         rebuild_timer)
-        if err then
-          log(ERR, "could not schedule timer to rebuild: ", err)
-        end
       end
     end,
   },
@@ -1105,23 +1134,6 @@ return {
   },
   access = {
     before = function(ctx)
-      -- If this is a version-conditional request, abort it if this dataplane has not processed at least the
-      -- specified configuration version yet.
-      local if_kong_transaction_id = kong.request and kong.request.get_header('x-if-kong-transaction-id')
-      if if_kong_transaction_id then
-        if_kong_transaction_id = tonumber(if_kong_transaction_id)
-        if if_kong_transaction_id and if_kong_transaction_id >= global.CURRENT_TRANSACTION_ID then
-          return kong.response.error(
-                  503,
-                  "Service Unavailable",
-                  {
-                    ["X-Kong-Reconfiguration-Status"] = "pending",
-                    ["Retry-After"] = tostring(kong.configuration.worker_state_update_frequency or 1),
-                  }
-          )
-        end
-      end
-
       -- if there is a gRPC service in the context, don't re-execute the pre-access
       -- phase handler - it has been executed before the internal redirect
       if ctx.service and (ctx.service.protocol == "grpc" or