[thread] close sockets at graceful shutdown

gunicorn/workers/gthread.py

@@ -44,11 +44,11 @@
 
 class TConn(object):
 
-    def __init__(self, cfg, listener, sock, addr):
+    def __init__(self, cfg, sock, client, server):
         self.cfg = cfg
-        self.listener = listener
         self.sock = sock
-        self.addr = addr
+        self.client = client
+        self.server = server
 
         self.timeout = None
         self.parser = None
@@ -127,11 +127,11 @@ def enqueue_req(self, conn):
         fs = self.tpool.submit(self.handle, conn)
         self._wrap_future(fs, conn)
 
-    def accept(self, listener):
+    def accept(self, server, listener):
         try:
-            client, addr = listener.accept()
+            sock, client = listener.accept()
             # initialize the connection object
-            conn = TConn(self.cfg, listener, client, addr)
+            conn = TConn(self.cfg, sock, client, server)
             self.nr_conns += 1
             # enqueue the job
             self.enqueue_req(conn)
@@ -192,11 +192,13 @@ def is_parent_alive(self):
 
     def run(self):
         # init listeners, add them to the event loop
-        for s in self.sockets:
-            s.setblocking(False)
-            self.poller.register(s, selectors.EVENT_READ, self.accept)
-
-        timeout = self.cfg.timeout or 0.5
+        for sock in self.sockets:
+            sock.setblocking(False)
+            # a race condition during graceful shutdown may make the listener
+            # name unavailable in the request handler so capture it once here
+            server = sock.getsockname()
+            acceptor = partial(self.accept, server)
+            self.poller.register(sock, selectors.EVENT_READ, acceptor)
 
         while self.alive:
             # notify the arbiter we are alive
@@ -205,33 +207,37 @@ def run(self):
             # can we accept more connections?
             if self.nr_conns < self.worker_connections:
                 # wait for an event
-                events = self.poller.select(0.02)
+                events = self.poller.select(1.0)
                 for key, mask in events:
                     callback = key.data
                     callback(key.fileobj)
 
+                # check (but do not wait) for finished requests
+                result = futures.wait(self.futures, timeout=0,
+                        return_when=futures.FIRST_COMPLETED)
+            else:
+                # wait for a request to finish
+                result = futures.wait(self.futures, timeout=1.0,
+                        return_when=futures.FIRST_COMPLETED)
+
+            # clean up finished requests
+            for fut in result.done:
+                self.futures.remove(fut)
+
             if not self.is_parent_alive():
                 break
 
             # hanle keepalive timeouts
             self.murder_keepalived()
 
-            # if the number of connections is < to the max we can handle at
-            # the same time there is no need to wait for one
-            if len(self.futures) < self.cfg.threads:
-                continue
-
-            result = futures.wait(self.futures, timeout=timeout,
-                    return_when=futures.FIRST_COMPLETED)
-
-            if not result.done:
-                break
-            else:
-                [self.futures.remove(f) for f in result.done]
-
         self.tpool.shutdown(False)
         self.poller.close()
 
+        for s in self.sockets:
+            s.close()
+
+        futures.wait(self.futures, timeout=self.cfg.graceful_timeout)
+
     def finish_request(self, fs):
         if fs.cancelled():
             fs.conn.close()
@@ -285,7 +291,7 @@ def handle(self, conn):
                 conn.sock.close()
             else:
                 self.log.debug("Error processing SSL request.")
-                self.handle_error(req, conn.sock, conn.addr, e)
+                self.handle_error(req, conn.sock, conn.client, e)
 
         except EnvironmentError as e:
             if e.errno not in (errno.EPIPE, errno.ECONNRESET):
@@ -296,7 +302,7 @@ def handle(self, conn):
                 else:
                     self.log.debug("Ignoring connection epipe")
         except Exception as e:
-            self.handle_error(req, conn.sock, conn.addr, e)
+            self.handle_error(req, conn.sock, conn.client, e)
 
         return (False, conn)
 
@@ -306,8 +312,8 @@ def handle_request(self, req, conn):
         try:
             self.cfg.pre_request(self, req)
             request_start = datetime.now()
-            resp, environ = wsgi.create(req, conn.sock, conn.addr,
-                    conn.listener.getsockname(), self.cfg)
+            resp, environ = wsgi.create(req, conn.sock, conn.client,
+                    conn.server, self.cfg)
             environ["wsgi.multithread"] = True
             self.nr += 1
             if self.alive and self.nr >= self.max_requests: