hooks: generate bind port before init of TcpServer for better logging.

rhodecode/lib/hooks_daemon.py

@@ -24,6 +24,7 b' import logging'
 import tempfile
 import traceback
 import threading
+import socket
 
 from BaseHTTPServer import BaseHTTPRequestHandler
 from SocketServer import TCPServer
@@ -152,20 +153,34 b' class HttpHooksCallbackDaemon(ThreadedHo'
     # request and wastes cpu at all other times.
     POLL_INTERVAL = 0.01
 
+    def get_available_port():
+        family = socket.AF_INET
+        socktype = socket.SOCK_STREAM
+        host = '127.0.0.1'
+
+        mysocket = socket.socket(family, socktype)
+        mysocket.bind((host, 0))
+        port = mysocket.getsockname()[1]
+        mysocket.close()
+        del mysocket
+        return port
+
     def _prepare(self, txn_id=None, host=None, port=None):
 
         host = host or '127.0.0.1'
-        self._done = False
+        port = port or self.get_available_port()
+        server_address = (host, port)
         self.hooks_uri = '{}:{}'.format(host, port)
         self.txn_id = txn_id
+        self._done = False
+
+        log.debug(
+            "Preparing HTTP callback daemon at `%s` and registering hook object: %s",
+            self.hooks_uri, HooksHttpHandler)
+
+        self._daemon = TCPServer(server_address, HooksHttpHandler)
         # inject transaction_id for later verification
         self._daemon.txn_id = self.txn_id
-        log.debug(
-            "Preparing HTTP callback daemon at `%s` and registering hook object",
-            self.hooks_uri)
-
-        self._daemon = TCPServer((host, port or 0), HooksHttpHandler)
-        _, port = self._daemon.server_address
 
     def _run(self):
         log.debug("Running event loop of callback daemon in background thread")