From 13efdcbda6029486c81190881873836126569fc6 Mon Sep 17 00:00:00 2001
From: Jan Tuomi <jans.tuomi@gmail.com>
Date: Wed, 29 Mar 2017 15:02:29 +0300
Subject: Initial commit

---
 server.py | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100755 server.py

(limited to 'server.py')

diff --git a/server.py b/server.py
new file mode 100755
index 0000000..9957710
--- /dev/null
+++ b/server.py
@@ -0,0 +1,91 @@
+#!/usr/bin/env python3
+
+import socket
+import threading
+from functools import partial
+from datetime import datetime
+
+HOST = "0.0.0.0"
+PORT = 5000
+DEBUG = True
+def debug(string):
+    if (DEBUG):
+        print("{} DEBUG: {}".format(datetime.now(), string))
+
+def parse_message(text):
+    rows = text.split('\n')
+    if (len(rows) < 3):
+        return None
+
+    try:
+        command = rows[0].strip()
+        username = rows[1].strip()
+        body = rows[2].strip()
+    except:
+        return None
+
+    debug("Command '{}' from '{}' with body '{}'".format(command, username, body))
+    return (command, username, body)
+
+def broadcast(message, username, recipients):
+    debug("Broadcasting message '{}'".format(message))
+    for rec in recipients:
+        response = "BROADCAST\n{}\n{}\n".format(username, message)
+        try:
+            rec.send(response.encode())
+        except OSError:
+            debug("ERROR: Couldn't broadcast message to {}".format(str(rec)))
+
+def do_command(command, username, body, bc):
+    if command == "CONNECT":
+        bc("User {} has connected".format(username), username)
+    elif command == "DISCONNECT":
+        bc("User {} has disconnected".format(username), username)
+    elif command == "MESSAGE":
+        bc("{}: {}".format(username, body), username)
+    elif command == "KEEPALIVE":
+        pass
+    else:
+        debug("Unknown command '{}' from user '{}'".format(command, username))
+
+def keep_connection(conn, addr, connections):
+    debug("Connection from: {}".format(addr))
+
+    broadcast_fun = partial(broadcast, recipients=connections)
+    while True:
+        data = conn.recv(1024).decode()
+
+        if not data:
+            break
+
+        data_tuple = parse_message(str(data))
+        if not data_tuple:
+            debug("Failed to parse data from client")
+            continue
+
+        command, username, body = data_tuple
+        do_command(command, username, body, broadcast_fun)
+
+    conn.close()
+    connections.remove(conn)
+    debug("Closed connection to: {}".format(addr))
+
+def main():
+    mySocket = socket.socket()
+    mySocket.bind((HOST, PORT))
+
+    connections = []
+    threads = []
+    mySocket.listen(1)
+    running = True
+
+    while running:
+        conn, addr = mySocket.accept()
+        t = threading.Thread(target=keep_connection, args=(conn, addr, connections))
+        threads.append(t)
+        connections.append(conn)
+        t.daemon = True
+        t.start()
+
+if __name__ == '__main__':
+    main()
-- 
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