Prompt Title: Report Generation and Validation.

Human: make this code better: import json from django.db import connection class Report: def __init__(self, **kwargs): self.name = kwargs.get('name') self.label = kwargs.get('label') self.database = kwargs.get('database') self.sql_command = kwargs.get('sql_command') self.types = kwargs.get('types') self.format = kwargs.get('format') class ReportCollection: def __init__(self): self.reports = [] # load config file # - validation of SQL command (forbid key words like "DROP", "UPDATE", "INSERT", "ALTER") # - validation of types, format etc. with open("/mnt/data/config.json") as config_file: config = json.load(config_file) for report in config: report_object = Report(**report) self.reports.append(report_object) def get_report_config(self, name): for report in self.reports: if report.name == name: return report class ReportingService: def generate_and_send_report(self, name, email): report = ReportCollection().get_report_config(name) with connection.cursor() as cursor: cursor.execute(report.sql_command) results = cursor.fetchall() for type in report.types: file = self.generate_file_from_sql_results(results, type=type) self.send_to_user(file, email) def generate_file_from_sql_results(self, results, type): if type == 'csv': with open('./tmp.csv') as file: for row in results: print(row, file=file) elif type == 'excel': # logic for excel with XlsxWriter library ... def send_to_user(self, file, email): NotificationService().notify_common(email=email, attachement=base64(file))

ChatGPT:

Here are some suggestions to improve the code:

1. Use constants for file paths and other configurations: Use a constant for the configuration file path instead of hardcoding it in the code. This makes it easy to change the path in the future if needed.

2. Use a context manager for opening files: When opening files, use a context manager to ensure that the file is closed properly after use.

3. Validate SQL command and other parameters in the Report object: Perform validation of the SQL command, types, and format fields in the Report object during object creation. If validation fails, raise an appropriate exception.

4. Use a library to generate CSV files: Instead of manually generating a CSV file, use a library such as the csv module in Python to generate the file.

5. Use a library to generate Excel files: Instead of manually generating an Excel file, use a library such as openpyxl or xlsxwriter to generate the file.

6. Add error handling: Add error handling to handle exceptions and errors that may occur during file generation and sending.

7. Use send_mail to send email: Use Django's built-in send_mail function to send email instead of a custom NotificationService.

Here is the improved code:

pythonCopy code
import json
import csv
import io

from django.core.mail import send_mail
from django.db import connection


CONFIG_FILE_PATH = "/mnt/data/config.json"
FORBIDDEN_SQL_KEYWORDS = ["DROP", "UPDATE", "INSERT", "ALTER"]
VALID_REPORT_TYPES = ["csv", "excel"]


class Report:
    def __init__(self, **kwargs):
        self.name = kwargs.get("name")
        self.label = kwargs.get("label")
        self.database = kwargs.get("database")
        self.sql_command = kwargs.get("sql_command")
        self.types = kwargs.get("types")
        self.format = kwargs.get("format")

        self._validate()

    def _validate(self):
        if not all(getattr(self, field) for field in ("name", "label", "database", "sql_command", "types", "format")):
            raise ValueError("All fields in Report object are required.")
        if any(keyword in self.sql_command.upper() for keyword in FORBIDDEN_SQL_KEYWORDS):
            raise ValueError("Invalid SQL command in Report object.")
        if any(report_type not in VALID_REPORT_TYPES for report_type in self.types):
            raise ValueError("Invalid report type in Report object.")


class ReportCollection:
    def __init__(self):
        self.reports = []
        with open(CONFIG_FILE_PATH) as config_file:
            config = json.load(config_file)
            for report in config:
                report_object = Report(**report)
                self.reports.append(report_object)

    def get_report_config(self, name):
        for report in self.reports:
            if report.name == name:
                return report


class ReportingService:
    def generate_and_send_report(self, name, email):
        report = ReportCollection().get_report_config(name)

        with connection.cursor() as cursor:
            cursor.execute(report.sql_command)
            results = cursor.fetchall()

        for report_type in report.types:
            file = self.generate_file_from_sql_results(results, report_type)

        self.send_to_user(file, email)

    def generate_file_from_sql_results(self, results, report_type):
        if report_type == "csv":
            output = io.StringIO()
            writer = csv.writer(output)
            writer.writerows(results)
            file = output.getvalue().encode("utf-8")
        elif report_type == "excel":
            # logic for excel with openpyxl or xlsxwriter library
            ...

        return file

    def send_to_user(self