insert via queue a single writer

v2realbot/common/db.py

@@ -1,5 +1,33 @@
 from v2realbot.config import DATA_DIR
 import sqlite3
+import queue
+import threading
 
 sqlite_db_file = DATA_DIR + "/v2trading.db"
-conn = sqlite3.connect(sqlite_db_file, check_same_thread=False, isolation_level=None)
+# Define the connection pool
+class ConnectionPool:
+    def __init__(self, max_connections):
+        self.max_connections = max_connections
+        self.connections = queue.Queue(max_connections)
+        self.lock = threading.Lock()
+
+    def get_connection(self):
+        with self.lock:
+            if self.connections.empty():
+                return self.create_connection()
+            else:
+                return self.connections.get()
+
+    def release_connection(self, connection):
+        with self.lock:
+            self.connections.put(connection)
+
+    def create_connection(self):
+        connection = sqlite3.connect(sqlite_db_file, check_same_thread=False)
+        return connection
+
+#for pool of connections if necessary
+pool = ConnectionPool(10)
+#for one shared connection (used for writes only in WAL mode)
+insert_conn = sqlite3.connect(sqlite_db_file, check_same_thread=False)
+insert_queue = queue.Queue()