uasyncio.core: Don't pass any callback args to add_reader/add_writer.

pfalcon · pfalcon · commit 460dd59b1611 · 2015-12-09T00:40:04.000+02:00
Instead, capture all needed param in closure. Due do bug in MicroPython's
handling of default args to lambdas, helper function is used.
diff --git a/uasyncio.core/uasyncio/core.py b/uasyncio.core/uasyncio/core.py
@@ -44,6 +44,12 @@ def wait(self, delay):
         log.debug("Sleeping for: %s", delay)
         time.sleep(delay)
 
+    # Workaround bug for in uPy - default args for lambda's are not supported
+    def lambda_helper(self, cb):
+        def lmb(cb=cb):
+            self.call_soon(cb)
+        return lmb
+
     def run_forever(self):
         while True:
             if self.q:
@@ -78,10 +84,12 @@ def run_forever(self):
                         elif isinstance(ret, IORead):
 #                            self.add_reader(ret.obj.fileno(), lambda self, c, f: self.call_soon(c, f), self, cb, ret.obj)
 #                            self.add_reader(ret.obj.fileno(), lambda c, f: self.call_soon(c, f), cb, ret.obj)
-                            self.add_reader(arg.fileno(), lambda cb, f: self.call_soon(cb, f), cb, arg)
+#                            self.add_reader(arg.fileno(), lambda cb: self.call_soon(cb), cb)
+                            self.add_reader(arg.fileno(), self.lambda_helper(cb))
                             continue
                         elif isinstance(ret, IOWrite):
-                            self.add_writer(arg.fileno(), lambda cb, f: self.call_soon(cb, f), cb, arg)
+#                            self.add_writer(arg.fileno(), lambda cb: self.call_soon(cb), cb)
+                            self.add_writer(arg.fileno(), self.lambda_helper(cb))
                             continue
                         elif isinstance(ret, IOReadDone):
                             self.remove_reader(arg.fileno())
