pastedeploy

import os import sys from io import StringIO from paste.deploy import loadapp # --- 1. Create a dummy config.ini for demonstration --- # This config uses 'call:__main__:create_app' to reference an app factory # defined directly in this script. It also shows `eval` for env vars. config_content = """ [app:main] use = call:__main__:create_app some_setting = hello another_setting = world my_env_var = eval(os.environ.get('QUICKSTART_ENV_VAR', 'default_env_val')) [server:main] use = egg:waitress#main # Waitress is a common WSGI server host = 127.0.0.1 port = 8080 """ with open("config.ini", "w") as f: f.write(config_content) # --- 2. Define the WSGI application factory --- # This factory function will be called by PasteDeploy to create the app. # It receives `global_conf` and other settings from the INI file. def create_app(global_conf, some_setting, another_setting, my_env_var): # Using wsgiref.simple_server.demo_app as a placeholder WSGI app from wsgiref.simple_server import demo_app print(f"[create_app] App factory called with global_conf: {global_conf}") print(f"[create_app] some_setting: {some_setting}") print(f"[create_app] another_setting: {another_setting}") print(f"[create_app] my_env_var (from os.environ via eval): {my_env_var}") return demo_app # --- 3. Load the application using paste.deploy --- print("\n--- Attempting to load WSGI application from config.ini ---") # Set an environment variable for testing `eval` in the config. os.environ['QUICKSTART_ENV_VAR'] = 'set_from_env_value' # `global_conf` is passed to the app factory (read-only configuration). # The '#main' refers to the `[app:main]` section in config.ini. try: app = loadapp('config:config.ini#main', global_conf={'process_id': os.getpid(), 'api_key': os.environ.get('PASTEDEPLOY_API_KEY', '')}) print(f"Successfully loaded WSGI application: {app}") # Verify the loaded app is callable (a basic WSGI check) assert callable(app) # A minimal test of the WSGI app (not actually running a server) response_body = [] def start_response(status, headers): pass list(app({'REQUEST_METHOD': 'GET', 'PATH_INFO': '/'}, start_response)) print("WSGI app is callable and passes a basic test.") finally: # --- 4. Clean up (important for a self-contained quickstart) --- os.remove("config.ini") if 'QUICKSTART_ENV_VAR' in os.environ: del os.environ['QUICKSTART_ENV_VAR'] print("\n--- Cleanup: Removed config.ini and environment variable ---")