asyncio: Use logging and errno modules.

Author: Paul Sokolovsky

asyncio/asyncio.py

@@ -1,7 +1,12 @@
+import __main__
 import time
 import heapq
+import errno
+import logging
 
 
+log = logging.getLogger("asyncio")
+
 def coroutine(f):
     return f
 
@@ -24,7 +29,7 @@ def call_later(self, delay, callback, *args):
     def call_at(self, time, callback, *args):
 #        self.q.append((callback, args))
         # self.cnt is workaround per heapq docs
-#        print("Scheduling", (time, self.cnt, callback, args))
+        log.debug("Scheduling %s", (time, self.cnt, callback, args))
         heapq.heappush(self.q, (time, self.cnt, callback, args))
 #        print(self.q)
         self.cnt += 1
@@ -42,6 +47,8 @@ def run_forever(self):
         while True:
             if self.q:
                 t, cnt, cb, args = heapq.heappop(self.q)
+                log.debug("Next task to run: %s", (t, cnt, cb, args))
+#                __main__.mem_info()
                 tnow = self.time()
                 delay = t - tnow
                 if delay > 0:
@@ -57,20 +64,22 @@ def run_forever(self):
                 try:
                     if args == ():
                         args = (None,)
-                    print("Send args:", args)
+                    log.debug("Gen send args: %s", args)
                     ret = cb.send(*args)
-                    print("ret:", ret)
+                    log.debug("Gen yield result: %s", ret)
                     if isinstance(ret, SysCall):
                         if isinstance(ret, Sleep):
                             delay = ret.args[0]
                         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(ret.obj.fileno(), lambda f: self.call_soon(cb, f), ret.obj)
                             continue
                         elif isinstance(ret, IOWrite):
                             self.add_writer(ret.obj.fileno(), lambda f: self.call_soon(cb, f), ret.obj)
                             continue
                 except StopIteration as e:
-                    print(cb, "finished")
+                    log.debug("Gen finished: %s", cb)
                     continue
                 #self.q.append(c)
                 self.call_later(delay, cb, *args)
@@ -99,22 +108,22 @@ def __init__(self):
         self.poller = select.epoll(1)
 
     def add_reader(self, fd, cb, *args):
-        print("add_reader")
+        log.debug("add_reader%s", (fd, cb, args))
         self.poller.register(fd, select.EPOLLIN, (cb, args))
 
     def add_writer(self, fd, cb, *args):
-        print("add_writer")
+        log.debug("add_writer%s", (fd, cb, args))
         self.poller.register(fd, select.EPOLLOUT, (cb, args))
 
     def wait(self, delay):
-        print("epoll.wait", delay)
+        log.debug("epoll.wait(%d)", delay)
         if delay == -1:
             res = self.poller.poll(-1)
         else:
             res = self.poller.poll(int(delay * 1000))
-        print("poll: ", res)
+        log.debug("epoll result: %s", res)
         for cb, ev in res:
-            print("Calling %s%s" % (cb[0], cb[1]))
+            log.debug("Calling IO callback: %s%s", cb[0], cb[1])
             cb[0](*cb[1])
 
 
@@ -164,11 +173,11 @@ def __init__(self, s):
         self.s = s
 
     def readline(self):
-        print("readline")
+        log.debug("StreamReader.readline()")
         s = yield IORead(self.s)
-        print("after IORead")
+        log.debug("StreamReader.readline(): after IORead: %s", s)
         res = self.s.readline()
-        print("readline res:", res)
+        log.debug("StreamReader.readline(): res: %s", res)
         return res
 
 
@@ -186,15 +195,17 @@ def write(self, buf):
 
 
 def open_connection(host, port):
+    log.debug("open_connection(%s, %s)", host, port)
     s = _socket.socket()
     s.setblocking(False)
     ai = _socket.getaddrinfo(host, port)
     addr = ai[0][4]
     try:
         s.connect(addr)
     except OSError as e:
-        print(e.args[0])
-    print("After connect")
+        if e.args[0] != errno.EINPROGRESS:
+            raise
+    log.debug("open_connection: After connect")
     s = yield IOWrite(s)
-    print("After iowait:", s)
+    log.debug("open_connection: After iowait: %s", s)
     return StreamReader(s), StreamWriter(s)