1 files changed, 82 insertions, 0 deletions
diff --git a/day4/task3/server.py b/day4/task3/server.py
new file mode 100644
index 0000000..b3cb619
--- /dev/null
+++ b/day4/task3/server.py
@@ -0,0 +1,82 @@
+import socket
+import struct
+from db import search_by_date
+import re
+import json
+
+
+def pack_data(data):
+    encoded = data.encode()
+    return struct.pack('I', len(encoded)) + encoded
+
+
+def handle_request(data):
+    match = re.match(r'(\d+):?(\d+)?:?(\d+)?-(.*)', data)
+    if match:
+        *date, msg = match.groups()
+        return pack_data(json.dumps(search_by_date(*date, msg)))
+
+    else:
+        print('String not matched.')
+        return pack_data(json.dumps([]))
+
+
+def get_data(connection):
+    buffer = b''
+    while len(buffer) < 4:
+        data = connection.recv(4 - len(buffer))
+        if not data:
+            raise ConnectionError('Connection was closed')
+
+        buffer += data
+
+    size_packed, buffer = buffer[:4], buffer[4:]
+    if not size_packed:
+        raise ConnectionError('Connection was closed')
+
+    (size,) = struct.unpack('I', size_packed)
+    data = connection.recv(size - len(buffer))
+    return buffer + data
+
+
+def handle_connection(connection, address):
+    while True:
+        try:
+            data = get_data(connection)
+
+        except ConnectionResetError:
+            print(f'Connection with {address[0]} was unexpectedly closed')
+            break
+
+        except ConnectionError:
+            print(f'Connection with {address[0]} was ended')
+            break
+
+        except KeyboardInterrupt:
+            raise KeyboardInterrupt()
+
+        else:
+            if not data:
+                print(f'Connection with {address[0]} was ended')
+                break
+            response = handle_request(data.decode())
+            connection.sendall(response)
+
+
+HOST, PORT = ADDR = '0.0.0.0', 6001
+sock = socket.socket()
+sock.bind(ADDR)
+sock.listen(5)
+
+while True:
+    print('Listening for new connections...')
+    try:
+        connection, address = sock.accept()
+        print(f'Got a connection from {address[0]}')
+        handle_connection(connection, address)
+
+    except KeyboardInterrupt:
+        print('Stopping server...')
+        sock.close()
+        print('Server stopped')
+        break