db refactoring, one and many

db.py

@@ -1,7 +1,10 @@
 import psycopg2
+import psycopg2.extras
 from loguru import logger
 import os
 import configparser
+import json
+import werkzeug
 
 
 
@@ -22,7 +25,11 @@ except KeyError:
     DB_HOST = config["database"]["host"]
     DB_NAME = config["database"]["name"]
 
-logger.info(f"db config: {DB_USER}, {DB_NAME}, {DB_HOST}, {DB_PASS}")
+
+
+class NoDataFoundException(Exception): pass
+
+class TooMuchDataFoundException(Exception): pass
 
 
 def databaseOperation(cursor, params):
@@ -38,10 +45,11 @@ def execDatabaseOperation(func, params):
     cur = None
     try:
         conn = psycopg2.connect(user = DB_USER, password = DB_PASS,
-                                host = DB_HOST, database = DB_NAME)
+                                host = DB_HOST, database = DB_NAME,
+                                sslmode = 'require')
         conn.autocommit = False
 
-        with conn.cursor() as cur:
+        with conn.cursor(cursor_factory = psycopg2.extras.RealDictCursor) as cur:
             return func(cur, params)
     except psycopg2.Error as err:
         raise Exception("Error when connecting to database: {}".format(err))
@@ -50,3 +58,46 @@ def execDatabaseOperation(func, params):
             conn.close()
 
 
+
+def _opGetMany(cursor, params):
+    items = []
+    cursor.execute(params["statement"])
+    for itemObj in cursor:
+        logger.debug("item received {}".format(str(itemObj)))
+        items.append(itemObj)
+    return items
+
+def dbGetMany(user, token_info, params):
+    logger.info("params: {}, token: {}".format(params, json.dumps(token_info)))
+    try:
+        return execDatabaseOperation(_opGetMany, params)
+    except Exception as e:
+        logger.error(f"Exception: {e}")
+        raise werkzeug.exceptions.InternalServerError
+
+
+
+def _opGetOne(cursor, params):
+    cursor.execute(params["statement"], params["params"])
+    itemObj = cursor.fetchone()
+    logger.debug(f"item received: {itemObj}")
+    if not itemObj:
+        raise NoDataFoundException
+    dummyObj = cursor.fetchone()
+    if dummyObj:
+        raise TooMuchDataFoundException
+    return itemObj
+
+def dbGetOne(user, token_info, params):
+    logger.info("params: {}, token: {}".format(params, json.dumps(token_info)))
+    try:
+        return execDatabaseOperation(_opGetOne, params)
+    except NoDataFoundException:
+        logger.error("no data found")
+        raise werkzeug.exceptions.NotFound
+    except TooMuchDataFoundException:
+        logger.error("too much data found")
+        raise werkzeug.exceptions.InternalServerError
+    except Exception as e:
+        logger.error(f"Exception: {e}")
+        raise werkzeug.exceptions.InternalServerError