webhooks: Use reactor to watch for writable fds

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/webhooks.py

@@ -171,9 +171,9 @@ class ClientConnection:
         self.uid = id(self)
         self.sock = sock
         self.fd_handle = self.reactor.register_fd(
-            self.sock.fileno(), self.process_received)
+            self.sock.fileno(), self.process_received, self._do_send)
         self.partial_data = self.send_buffer = b""
-        self.is_sending_data = False
+        self.is_blocking = False
         self.set_client_info("?", "New connection")
         self.request_log = collections.deque([], REQUEST_LOG_SIZE)
 
@@ -259,33 +259,28 @@ class ClientConnection:
     def send(self, data):
         jmsg = json.dumps(data, separators=(',', ':'))
         self.send_buffer += jmsg.encode() + b"\x03"
-        if not self.is_sending_data:
-            self.is_sending_data = True
-            self.reactor.register_callback(self._do_send)
+        if not self.is_blocking:
+            self._do_send()
 
-    def _do_send(self, eventtime):
-        retries = 10
-        while self.send_buffer:
-            try:
-                sent = self.sock.send(self.send_buffer)
-            except socket.error as e:
-                if e.errno == errno.EBADF or e.errno == errno.EPIPE \
-                        or not retries:
-                    sent = 0
-                else:
-                    retries -= 1
-                    waketime = self.reactor.monotonic() + .001
-                    self.reactor.pause(waketime)
-                    continue
-            retries = 10
-            if sent > 0:
-                self.send_buffer = self.send_buffer[sent:]
-            else:
-                logging.info(
-                    "webhooks: Error sending server data,  closing socket")
+    def _do_send(self, eventtime=None):
+        if self.fd_handle is None:
+            return
+        try:
+            sent = self.sock.send(self.send_buffer)
+        except socket.error as e:
+            if e.errno not in [errno.EAGAIN, errno.EWOULDBLOCK]:
+                logging.info("webhooks: socket write error %d" % (self.uid,))
                 self.close()
-                break
-        self.is_sending_data = False
+                return
+            sent = 0
+        if sent < len(self.send_buffer):
+            if not self.is_blocking:
+                self.reactor.set_fd_wake(self.fd_handle, False, True)
+                self.is_blocking = True
+        elif self.is_blocking:
+            self.reactor.set_fd_wake(self.fd_handle, True, False)
+            self.is_blocking = False
+        self.send_buffer = self.send_buffer[sent:]
 
 class WebHooks:
     def __init__(self, printer):