NOTASK: make tarantool-queue reloadable with moonlibs/package.reload

Author: Maxim Uymin

queue/abstract/driver/fifottl.lua

@@ -196,7 +196,7 @@ function tube.new(space, on_task_change, opts)
     }, { __index = method })
 
     self.cond  = qc.waiter()
-    self.fiber = fiber.create(fifottl_fiber, self)
+    self.fiber = util.background_fiber(fifottl_fiber, self)
     self.sync_chan = fiber.channel()
 
     return self
@@ -412,7 +412,7 @@ function method.start(self)
     if self.fiber then
         return
     end
-    self.fiber = fiber.create(fifottl_fiber, self)
+    self.fiber = util.background_fiber(fifottl_fiber, self)
 end
 
 function method.stop(self)

queue/abstract/driver/utubettl.lua

@@ -383,7 +383,7 @@ function tube.new(space, on_task_change, opts)
     }, { __index = method })
 
     self.cond  = qc.waiter()
-    self.fiber = fiber.create(utubettl_fiber, self)
+    self.fiber = util.background_fiber(utubettl_fiber, self)
     self.sync_chan = fiber.channel(1)
 
     return self
@@ -741,7 +741,7 @@ function method.start(self)
     if self.fiber then
         return
     end
-    self.fiber = fiber.create(utubettl_fiber, self)
+    self.fiber = util.background_fiber(utubettl_fiber, self)
 end
 
 function method.stop(self)

queue/abstract/queue_session.lua

@@ -171,7 +171,7 @@ end
 
 --- Create an expiration fiber to cleanup expired sessions.
 local function create_expiration_fiber()
-    local exp_fiber = fiber.create(function()
+    local exp_fiber = util.background_fiber(function()
         fiber.self():name('queue_expiration_fiber')
         while true do
             if box.info.ro == false then

queue/abstract/queue_state.lua

@@ -2,6 +2,7 @@
 
 local log   = require('log')
 local fiber = require('fiber')
+local util  = require('queue.util')
 
 --[[ States switching scheme:
 
@@ -62,7 +63,7 @@ end
 local function create_state_fiber(on_state_change_cb)
     log.info('Started queue state fiber')
 
-    fiber.create(function()
+    util.background_fiber(function()
         fiber.self():name('queue_state_fiber')
         while true do
             if current == queue_state.states.WAITING then

queue/init.lua

@@ -4,6 +4,7 @@ local abstract = require('queue.abstract')
 local queue_state = require('queue.abstract.queue_state')
 local qc = require('queue.compat')
 local queue = nil
+local util = require('queue.util')
 
 -- load all core drivers
 local core_drivers = {
@@ -107,7 +108,7 @@ local function wrap_box_cfg()
             cfg_mt.__call = cfg_call_wrapper
         else
             -- Wait for the rw state.
-            fiber.new(rw_waiter)
+            util.background_fiber(rw_waiter)
         end
     else
         error('The box.cfg type is unexpected: ' .. type(box.cfg))

queue/util.lua

@@ -34,6 +34,23 @@ local function event_time(tm)
     return tm
 end
 
+local function background_fiber(func, ...)
+    local fib = fiber.new(func, ...)
+
+    if not package.reload then
+        return fib
+    end
+
+    fib:set_joinable(true)
+
+    package.reload:register(function()
+        fib:cancel()
+        fib:join()
+    end)
+
+    return fib
+end
+
 local util = {
     MAX_TIMEOUT = MAX_TIMEOUT,
     TIMEOUT_INFINITY = TIMEOUT_INFINITY
@@ -42,7 +59,8 @@ local util = {
 -- methods
 local method = {
     time = time,
-    event_time = event_time
+    event_time = event_time,
+    background_fiber = background_fiber,
 }
 
 return setmetatable(util, { __index = method })