From dac8d31567b4b47c32f41e8c38e634d784d6553b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B8rn-Andre=20Skaar?=
 <31540110+bjornandre@users.noreply.github.com>
Date: Tue, 13 Sep 2022 14:52:30 +0200
Subject: [PATCH] Pick a random port number at startup (#59)

* Pick a random port at startup
---
 DataDoc.ipynb    | 2 +-
 datadoc/app.py   | 4 ++--
 datadoc/utils.py | 9 +++++++++
 3 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/DataDoc.ipynb b/DataDoc.ipynb
index 47b171d4..6c02729b 100644
--- a/DataDoc.ipynb
+++ b/DataDoc.ipynb
@@ -35,4 +35,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 5
-}
+}
\ No newline at end of file
diff --git a/datadoc/app.py b/datadoc/app.py
index c03d0ef2..f9278b76 100644
--- a/datadoc/app.py
+++ b/datadoc/app.py
@@ -21,7 +21,7 @@
     progress_bar,
 )
 from datadoc.frontend.components.VariablesTab import get_variables_tab
-from datadoc.utils import running_in_notebook
+from datadoc.utils import running_in_notebook, pick_random_port
 
 logger = logging.getLogger(__name__)
 
@@ -90,7 +90,7 @@ def main(dataset_path: str = None):
 
         JupyterDash.infer_jupyter_proxy_config()
         app = build_app(JupyterDash)
-        app.run_server(mode="jupyterlab")
+        app.run_server(mode="jupyterlab", port=pick_random_port())
     else:
         # Assume running in server mode is better (largely for development purposes)
         logger.debug("Starting in development mode")
diff --git a/datadoc/utils.py b/datadoc/utils.py
index 1bbe9418..5a16e786 100644
--- a/datadoc/utils.py
+++ b/datadoc/utils.py
@@ -30,3 +30,12 @@ def get_display_values(
             value = value.dict()[current_language.value]
         return_dict[field_name] = value
     return return_dict
+
+
+def pick_random_port():
+    """Pick a random free port number. The function will bind a socket to port 0, and
+    a random free port from 1024 to 65535 will be selected by the operating system."""
+    import socket
+    sock = socket.socket()
+    sock.bind(('', 0))
+    return sock.getsockname()[1]