From f7b00442d21032aa5e68bcdd3ca4b3e38467fc31 Mon Sep 17 00:00:00 2001
From: Ahmed Mamdouh <a.mamd007@gmail.com>
Date: Mon, 24 Feb 2025 04:04:43 +0200
Subject: [PATCH] Add class for delayed job handler

---
 pyworker/job_handler.py | 140 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 pyworker/job_handler.py

diff --git a/pyworker/job_handler.py b/pyworker/job_handler.py
new file mode 100644
index 0000000..96723ac
--- /dev/null
+++ b/pyworker/job_handler.py
@@ -0,0 +1,140 @@
+import json
+import logging
+from datetime import datetime
+from typing import Dict, Any
+
+
+def format_args(args, yaml_style=False):
+    """
+    Formats the args dictionary into the desired output format.
+
+    Args:
+        args (dict): A dictionary of variable names and their values.
+        yaml_style (bool): If True, formats the output in YAML-style.
+
+    Returns:
+        str: The formatted string.
+    """
+    formatted_args = []
+
+    for key, value in args.items():
+        if value is None or value == "":
+            formatted_value = ""
+        elif isinstance(value, str):
+            formatted_value = f'"{value}"'
+        elif isinstance(value, dict):
+            formatted_value = json.dumps(value)  # Convert dict to JSON format
+        else:
+            formatted_value = value
+
+        if yaml_style:
+            formatted_args.append(f" :{key}: {formatted_value}")
+        else:
+            formatted_args.append(f"    {key}: {formatted_value}")
+
+    if yaml_style:
+        return "\n".join(f"-{formatted_args[0]}" if i == 0 else f" {line}" for i, line in enumerate(formatted_args))
+
+    return "\n".join(formatted_args)
+
+
+def generate_handler(classname: str, args: Dict[str, Any], use_class_object: bool = True, method_name: str ='run') -> str:
+    """
+    Generates a handler string in the Delayed::PerformableMethod format.
+
+    Args:
+        classname (str): The class name to be used in the handler.
+        args (Dict[str, Any]): A dictionary of arguments where keys are variable names and values are their corresponding values.
+        use_class_object (bool): Determines whether to use an object or a class reference.
+
+    Returns:
+        str: The formatted handler string.
+    """
+    # Generate the args section dynamically
+    formatted_args = format_args(args, yaml_style=(use_class_object==False))
+
+    if use_class_object:
+        return f"""--- !ruby/object:Delayed::PerformableMethod
+object: !ruby/object:{classname}
+  raw_attributes:
+{formatted_args}
+"""
+    else:
+
+        return f"""--- !ruby/object:Delayed::PerformableMethod
+object: !ruby/class '{classname}'
+method_name: :{method_name}
+args:
+{formatted_args}
+"""
+
+
+class DelayedJobHandler:
+    def __init__(self, database, logger=None):
+        """
+        Initializes the DelayedJobHandler with a database connection and logger.
+
+        :param database: A database connection object.
+        :param logger: A logger object (optional). If not provided, a default logger will be used.
+        """
+        self.database = database
+        self.logger = logger or logging.getLogger(__name__)
+
+    def get_current_time(self):
+        """
+        Helper function to get the current time.
+
+        :return: The current time as a datetime object.
+        """
+        return datetime.now()
+
+    def create_delayed_job(
+        self,
+        classname: str,
+        args: Dict[str, Any],
+        queue: str = "default",
+        use_class_object: bool = True,
+        method_name: str = "run"
+    ) -> None:
+        """
+        Creates a delayed job with the given class and arguments.
+
+        Args:
+            classname (str): The name of the class to be used in the handler.
+            args (Dict[str, Any]): A dictionary of arguments where keys are variable names and values are their corresponding values.
+            queue (str, optional): The queue name where the job should be enqueued. Defaults to "default".
+            use_class_object (bool, optional): Determines whether the object should be instantiated (`True`) or referenced as a class (`False`). Defaults to `True`.
+            method_name (str, optional): The method to be invoked on the class. Defaults to `"run"`.
+
+        Returns:
+            None
+        """
+
+        # Generate the handler string dynamically
+        handler = generate_handler(
+            classname=classname,
+            args=args,
+            use_class_object=use_class_object,
+            method_name=method_name
+        )
+        # SQL query to insert the delayed job
+        query = '''
+        INSERT INTO delayed_jobs
+            (handler, queue, run_at, created_at, updated_at)
+        VALUES
+            (%s, %s, %s, %s, %s)
+        '''
+
+        # Log the query for debugging
+        self.logger.debug(f"Insert delayed job query: {query}")
+        self.logger.debug(f"Handler: {handler}")
+        self.logger.debug(f"queue: {queue}")
+        # Get the current time
+        now = self.get_current_time()
+
+        # Execute the query
+        cursor = self.database.cursor()
+        cursor.execute(query, (handler, queue, now, now, now))
+
+        # Commit the transaction
+        self.database.commit()
\ No newline at end of file