ASLM-Python-Example-Module/main.py at main · NEXTGGTECH/ASLM-Python-Example-Module · GitHub

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from __future__ importannotations

importargparse
importjson
importos
importsys
importthreading
frompathlibimportPath


# Prepare project imports
BASE_DIR=os.path.dirname(os.path.abspath(__file__))
ifBASE_DIRnotinsys.path:
sys.path.insert(0, BASE_DIR)


# Lazy Flask application
classLazyFlaskApplication:
"""Bind the port before Flask loads so ASLM can reserve example-port immediately."""

# Initialize loader state (app not created yet).
def__init__(self) ->None:
"""Initialize loader state (app not created yet)."""

self._application=None
self._error: BaseException|None=None
self._ready=threading.Event()
self._lock=threading.Lock()

# Start a daemon thread that imports and builds the Flask app.
defload_in_background(self) ->None:
"""Start a daemon thread that imports and builds the Flask app."""

thread=threading.Thread(
target=self._load,
name="aslm-example-flask-loader",
daemon=True,
 )
thread.start()

# Import App.app.create_app once; store result or error for WSGI.
def_load(self) ->None:
"""Import App.app.create_app once; store result or error for WSGI."""

withself._lock:
ifself._applicationisnotNoneorself._errorisnotNone:
return
try:
fromApp.appimportcreate_app

self._application=create_app()
exceptBaseExceptionasexc:
self._error=exc
finally:
self._ready.set()

# Serve requests: Flask app, startup error page, or loading placeholder.
def__call__(self, environ, start_response):
"""Serve requests: Flask app, startup error page, or loading placeholder."""

# Flask finished loading — delegate to the real application.
ifself._applicationisnotNone:
returnself._application(environ, start_response)

# Import or create_app failed — return plain-text 500.
ifself._errorisnotNone:
body=f"ASLM-Example failed to start: {self._error}".encode("utf-8", errors="replace")
start_response(
"500 Internal Server Error",
 [("Content-Type", "text/plain; charset=utf-8"), ("Content-Length", str(len(body)))],
 )
return [body]

# Still loading — auto-refresh HTML so the WebView retries.
body= (
"<!doctype html><html><head><meta charset=\"utf-8\">"
"<meta http-equiv=\"refresh\" content=\"1\">"
"<title>Example Python Module starting</title></head>"
"<body style=\"font-family:Segoe UI,sans-serif;background:#111;color:#eee;\">"
"Example Python Module is starting\u2026"
"</body></html>"
 ).encode("utf-8")
start_response(
"503 Service Unavailable",
 [
 ("Content-Type", "text/html; charset=utf-8"),
 ("Content-Length", str(len(body))),
 ("Retry-After", "1"),
 ],
 )
return [body]


# Run runserver
defcmd_runserver(port: int, log: bool) ->None:
"""Start the Flask UI server on the requested port."""

iflog:
print(f"[ASLM-Example] Starting server on port {port}...")

fromsocketserverimportThreadingMixIn
fromwsgiref.simple_serverimportWSGIRequestHandler, WSGIServer, make_server

classThreadedWSGIServer(ThreadingMixIn, WSGIServer):
"""Serve requests concurrently."""

daemon_threads=True

classQuietWSGIRequestHandler(WSGIRequestHandler):
"""Suppress routine HTTP access logs in the ASLM console."""

# Suppress per-request access log lines.
deflog_message(self, format: str, *args) ->None:
return

# Bind socket immediately; load Flask on a background thread.
app=LazyFlaskApplication()
withmake_server(
"127.0.0.1",
port,
app,
server_class=ThreadedWSGIServer,
handler_class=QuietWSGIRequestHandler,
 ) ashttpd:
app.load_in_background()
iflog:
print(f"[ASLM-Example] UI server listening at http://127.0.0.1:{port}/", flush=True)
httpd.serve_forever()


# Run first_run
defcmd_first_run(log: bool, ui_port: int) ->None:
"""Run Settings/first_run.py (settings.json only; venv is host-managed)."""

fromSettings.first_runimportrunasfirst_run

first_run(log=log, ui_port=ui_port)


# Run get_setting
defcmd_get_setting(key: str) ->None:
"""Print one setting value to stdout for ASLM getExec."""

fromSettings.settingsimportget

value=get(key)
print(valueifvalueisnotNoneelse"")


# Run set_setting
defcmd_set_setting(key: str, value: str) ->None:
"""Parse {value} and persist one setting for ASLM setExec."""

fromSettings.settingsimportnormalize_setting_value, setassettings_set

parsed=normalize_setting_value(value)
settings_set(key, parsed)
print(f"[ASLM-Example] Setting '{key}' updated to {parsed!r}")


# Run apply_aslm_host_theme
defcmd_apply_aslm_host_theme(theme_file: str) ->None:
"""Load host theme JSON from --file and write Settings/host_theme.json."""

fromSettings.host_themeimportsave_host_theme_payload

# Read temp file written by ASLM before setExec.
path=Path(theme_file)
ifnotpath.is_file():
print(f"Error: theme file not found: {theme_file}")
sys.exit(1)
try:
raw=path.read_text(encoding="utf-8")
exceptOSErrorasexc:
print(f"Error: could not read theme file: {exc}")
sys.exit(1)

# .NET may write UTF-8 with BOM; strip it before JSON parsing.
raw=raw.lstrip("\ufeff").strip()
try:
data=json.loads(raw)
exceptjson.JSONDecodeErrorasexc:
print(f"Error: invalid JSON in theme file: {exc}")
sys.exit(1)
ifnotisinstance(data, dict):
print("Error: host theme JSON must be an object.")
sys.exit(1)

save_host_theme_payload(data)
print("[ASLM-Example] Host theme snapshot updated.")


# Run apply_aslm_locale
defcmd_apply_aslm_locale(locale_file: str) ->None:
"""Load host locale JSON from --file and write Settings/host_locale.json."""

fromSettings.host_localeimportsave_host_locale_payload

path=Path(locale_file)
ifnotpath.is_file():
print(f"Error: locale file not found: {locale_file}")
sys.exit(1)
try:
raw=path.read_text(encoding="utf-8")
exceptOSErrorasexc:
print(f"Error: could not read locale file: {exc}")
sys.exit(1)

raw=raw.lstrip("\ufeff").strip()
try:
data=json.loads(raw)
exceptjson.JSONDecodeErrorasexc:
print(f"Error: invalid JSON in locale file: {exc}")
sys.exit(1)
ifnotisinstance(data, dict):
print("Error: host locale JSON must be an object.")
sys.exit(1)

save_host_locale_payload(data)
print("[ASLM-Example] Host locale snapshot updated.")


# Run downloads_bridge
defcmd_downloads_bridge() ->None:
"""Dispatch one bridge request from stdin and print the JSON response."""

fromServices.downloads_bridgeimportrun_cli

raiseSystemExit(run_cli())


# CLI parser
def_build_parser() ->argparse.ArgumentParser:
"""Return the argparse definition for main.py."""

parser=argparse.ArgumentParser(
prog="main.py",
description="Example Python Module — ASLM command entry point",
 )
parser.add_argument("command", type=str, help="Command to execute")
parser.add_argument("--port", type=int, default=20100, help="Port for runserver (default: 20100)")
parser.add_argument("--key", type=str, default=None, help="Setting key for get_setting/set_setting")
parser.add_argument("--value", type=str, default=None, help="Setting value for set_setting")
parser.add_argument(
"--file",
type=str,
default=None,
help="Path to JSON payload for apply_aslm_host_theme or apply_aslm_locale",
 )
parser.add_argument("--log", action="store_true", help="Enable verbose output")
returnparser


# Startup banner
def_maybe_print_banner(command: str) ->None:
"""Print the module name for commands that are not machine-readable hooks."""

# Hooks that must emit only machine-readable stdout.
silent= {
"get_setting",
"set_setting",
"downloads_bridge",
"apply_aslm_host_theme",
"apply_aslm_locale",
 }
ifcommandnotinsilent:
try:
manifest_path=Path(BASE_DIR) /"ASLM_Module.json"
ifmanifest_path.exists():
manifest=json.loads(manifest_path.read_text(encoding="utf-8"))
name=manifest.get("name", "Example Python Module")
version=manifest.get("version", "")
print(f"[ASLM-Example] {name} v{version}")
exceptException:
pass


# Port resolution
def_resolve_runserver_port(requested_port: int) ->int:
"""Prefer CLI port, then ASLM_UI_PORT, then settings.json example-port."""

# Explicit CLI override (not the default 20100 placeholder).
ifrequested_port!=20100:
returnrequested_port

# Host-injected port when ASLM starts runserver.
env_port=os.environ.get("ASLM_UI_PORT")
ifenv_port:
try:
returnint(env_port)
exceptValueError:
pass

# Fall back to persisted settings.
try:
fromSettings.settingsimportload_settings

runtime_settings=load_settings()
returnint(runtime_settings.get("example-port", 20100))
exceptException:
return20100


# Main entry
defmain() ->None:
"""Parse argv and dispatch the requested command."""

parser=_build_parser()
args=parser.parse_args()

_maybe_print_banner(args.command)

matchargs.command:
case"runserver":
port=_resolve_runserver_port(args.port)
cmd_runserver(port, log=args.log)

case"first_run":
cmd_first_run(log=True, ui_port=args.port)

case"get_setting":
ifnotargs.key:
print("Error: --key argument is required.")
sys.exit(1)
cmd_get_setting(args.key)

case"set_setting":
ifnotargs.keyorargs.valueisNone:
print("Error: --key and --value arguments are required.")
sys.exit(1)
cmd_set_setting(args.key, args.value)

case"apply_aslm_host_theme":
ifnotargs.file:
print("Error: --file argument is required.")
sys.exit(1)
cmd_apply_aslm_host_theme(args.file)

case"apply_aslm_locale":
ifnotargs.file:
print("Error: --file argument is required.")
sys.exit(1)
cmd_apply_aslm_locale(args.file)

case"downloads_bridge":
cmd_downloads_bridge()

case"help":
parser.print_help()

case _:
print(f"[ASLM-Example] Unknown command: '{args.command}'")
print("Run 'python main.py help' for usage.")
sys.exit(1)


if__name__=="__main__":
main()