mirror of
https://github.com/lnbits/lnbits-legend.git
synced 2024-11-19 18:11:30 +01:00
456 lines
15 KiB
Python
456 lines
15 KiB
Python
import asyncio
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import glob
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import importlib
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import logging
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import os
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import shutil
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import signal
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import sys
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import traceback
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from http import HTTPStatus
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from typing import Callable, List
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from fastapi import FastAPI, Request
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from fastapi.exceptions import HTTPException, RequestValidationError
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from fastapi.middleware.cors import CORSMiddleware
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from fastapi.middleware.gzip import GZipMiddleware
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from fastapi.responses import JSONResponse
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from fastapi.staticfiles import StaticFiles
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from loguru import logger
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from lnbits.core.crud import get_installed_extensions
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from lnbits.core.helpers import migrate_extension_database
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from lnbits.core.tasks import register_task_listeners
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from lnbits.settings import get_wallet_class, set_wallet_class, settings
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from .commands import db_versions, load_disabled_extension_list, migrate_databases
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from .core import (
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add_installed_extension,
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core_app,
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core_app_extra,
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update_installed_extension_state,
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)
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from .core.services import check_admin_settings
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from .core.views.generic import core_html_routes
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from .extension_manager import Extension, InstallableExtension, get_valid_extensions
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from .helpers import template_renderer
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from .middleware import ExtensionsRedirectMiddleware, InstalledExtensionMiddleware
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from .requestvars import g
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from .tasks import (
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catch_everything_and_restart,
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check_pending_payments,
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internal_invoice_listener,
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invoice_listener,
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webhook_handler,
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)
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def create_app() -> FastAPI:
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configure_logger()
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app = FastAPI(
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title="LNbits API",
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description="API for LNbits, the free and open source bitcoin wallet and accounts system with plugins.",
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version=settings.version,
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license_info={
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"name": "MIT License",
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"url": "https://raw.githubusercontent.com/lnbits/lnbits/main/LICENSE",
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},
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)
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app.mount("/static", StaticFiles(packages=[("lnbits", "static")]), name="static")
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app.mount(
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"/core/static",
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StaticFiles(packages=[("lnbits.core", "static")]),
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name="core_static",
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)
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g().base_url = f"http://{settings.host}:{settings.port}"
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app.add_middleware(
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CORSMiddleware, allow_origins=["*"], allow_methods=["*"], allow_headers=["*"]
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)
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app.add_middleware(GZipMiddleware, minimum_size=1000)
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# order of these two middlewares is important
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app.add_middleware(InstalledExtensionMiddleware)
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app.add_middleware(ExtensionsRedirectMiddleware)
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register_startup(app)
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register_routes(app)
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register_async_tasks(app)
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register_exception_handlers(app)
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# Allow registering new extensions routes without direct access to the `app` object
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setattr(core_app_extra, "register_new_ext_routes", register_new_ext_routes(app))
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return app
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async def check_funding_source() -> None:
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original_sigint_handler = signal.getsignal(signal.SIGINT)
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def signal_handler(signal, frame):
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logger.debug("SIGINT received, terminating LNbits.")
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sys.exit(1)
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signal.signal(signal.SIGINT, signal_handler)
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WALLET = get_wallet_class()
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# fallback to void after 30 seconds of failures
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sleep_time = 5
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timeout = int(30 / sleep_time)
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balance = 0
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retry_counter = 0
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while True:
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try:
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error_message, balance = await WALLET.status()
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if not error_message:
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retry_counter = 0
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break
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logger.error(
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f"The backend for {WALLET.__class__.__name__} isn't working properly: '{error_message}'",
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RuntimeWarning,
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)
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except:
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pass
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if settings.lnbits_admin_ui and retry_counter == timeout:
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logger.warning(
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f"Fallback to VoidWallet, because the backend for {WALLET.__class__.__name__} isn't working properly"
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)
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set_wallet_class("VoidWallet")
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WALLET = get_wallet_class()
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break
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else:
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logger.warning(f"Retrying connection to backend in {sleep_time} seconds...")
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retry_counter += 1
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await asyncio.sleep(sleep_time)
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signal.signal(signal.SIGINT, original_sigint_handler)
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logger.info(
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f"✔️ Backend {WALLET.__class__.__name__} connected and with a balance of {balance} msat."
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)
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async def check_installed_extensions(app: FastAPI):
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"""
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Check extensions that have been installed, but for some reason no longer present in the 'lnbits/extensions' directory.
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One reason might be a docker-container that was re-created.
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The 'data' directory (where the '.zip' files live) is expected to persist state.
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Zips that are missing will be re-downloaded.
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"""
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shutil.rmtree(os.path.join("lnbits", "upgrades"), True)
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await load_disabled_extension_list()
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installed_extensions = await build_all_installed_extensions_list()
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for ext in installed_extensions:
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try:
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installed = check_installed_extension(ext)
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if not installed:
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await restore_installed_extension(app, ext)
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logger.info(
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f"✔️ Successfully re-installed extension: {ext.id} ({ext.installed_version})"
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)
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except Exception as e:
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logger.warning(e)
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logger.warning(
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f"Failed to re-install extension: {ext.id} ({ext.installed_version})"
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)
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async def build_all_installed_extensions_list() -> List[InstallableExtension]:
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"""
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Returns a list of all the installed extensions plus the extensions that
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MUST be installed by default (see LNBITS_EXTENSIONS_DEFAULT_INSTALL).
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"""
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installed_extensions = await get_installed_extensions()
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installed_extensions_ids = [e.id for e in installed_extensions]
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for ext_id in settings.lnbits_extensions_default_install:
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if ext_id in installed_extensions_ids:
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continue
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ext_releases = await InstallableExtension.get_extension_releases(ext_id)
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release = ext_releases[0] if len(ext_releases) else None
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if release:
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ext_info = InstallableExtension(
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id=ext_id, name=ext_id, installed_release=release, icon=release.icon
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)
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installed_extensions.append(ext_info)
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await add_installed_extension(ext_info)
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await update_installed_extension_state(ext_id=ext_id, active=True)
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return installed_extensions
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def check_installed_extension(ext: InstallableExtension) -> bool:
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if ext.has_installed_version:
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return True
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zip_files = glob.glob(
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os.path.join(settings.lnbits_data_folder, "extensions", "*.zip")
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)
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if f"./{str(ext.zip_path)}" not in zip_files:
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ext.download_archive()
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ext.extract_archive()
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return False
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async def restore_installed_extension(app: FastAPI, ext: InstallableExtension):
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extension = Extension.from_installable_ext(ext)
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register_ext_routes(app, extension)
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current_version = (await db_versions()).get(ext.id, 0)
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await migrate_extension_database(extension, current_version)
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# mount routes for the new version
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core_app_extra.register_new_ext_routes(extension)
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if extension.upgrade_hash:
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ext.nofiy_upgrade()
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def register_routes(app: FastAPI) -> None:
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"""Register FastAPI routes / LNbits extensions."""
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app.include_router(core_app)
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app.include_router(core_html_routes)
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for ext in get_valid_extensions():
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try:
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register_ext_routes(app, ext)
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except Exception as e:
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logger.error(str(e))
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raise ImportError(
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f"Please make sure that the extension `{ext.code}` follows conventions."
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)
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def register_new_ext_routes(app: FastAPI) -> Callable:
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# Returns a function that registers new routes for an extension.
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# The returned function encapsulates (creates a closure around) the `app` object but does expose it.
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def register_new_ext_routes_fn(ext: Extension):
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register_ext_routes(app, ext)
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return register_new_ext_routes_fn
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def register_ext_routes(app: FastAPI, ext: Extension) -> None:
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"""Register FastAPI routes for extension."""
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ext_module = importlib.import_module(ext.module_name)
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ext_route = getattr(ext_module, f"{ext.code}_ext")
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if hasattr(ext_module, f"{ext.code}_start"):
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ext_start_func = getattr(ext_module, f"{ext.code}_start")
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ext_start_func()
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if hasattr(ext_module, f"{ext.code}_static_files"):
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ext_statics = getattr(ext_module, f"{ext.code}_static_files")
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for s in ext_statics:
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app.mount(s["path"], s["app"], s["name"])
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if hasattr(ext_module, f"{ext.code}_redirect_paths"):
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ext_redirects = getattr(ext_module, f"{ext.code}_redirect_paths")
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settings.lnbits_extensions_redirects = [
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r for r in settings.lnbits_extensions_redirects if r["ext_id"] != ext.code
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]
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for r in ext_redirects:
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r["ext_id"] = ext.code
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settings.lnbits_extensions_redirects.append(r)
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logger.trace(f"adding route for extension {ext_module}")
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prefix = f"/upgrades/{ext.upgrade_hash}" if ext.upgrade_hash != "" else ""
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app.include_router(router=ext_route, prefix=prefix)
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def register_startup(app: FastAPI):
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@app.on_event("startup")
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async def lnbits_startup():
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try:
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# wait till migration is done
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await migrate_databases()
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# setup admin settings
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await check_admin_settings()
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log_server_info()
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# initialize WALLET
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set_wallet_class()
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# initialize funding source
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await check_funding_source()
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# check extensions after restart
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await check_installed_extensions(app)
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except Exception as e:
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logger.error(str(e))
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raise ImportError("Failed to run 'startup' event.")
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def log_server_info():
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logger.info("Starting LNbits")
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logger.info(f"Version: {settings.version}")
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logger.info(f"Baseurl: {settings.lnbits_baseurl}")
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logger.info(f"Host: {settings.host}")
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logger.info(f"Port: {settings.port}")
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logger.info(f"Debug: {settings.debug}")
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logger.info(f"Site title: {settings.lnbits_site_title}")
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logger.info(f"Funding source: {settings.lnbits_backend_wallet_class}")
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logger.info(f"Data folder: {settings.lnbits_data_folder}")
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logger.info(f"Git version: {settings.lnbits_commit}")
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logger.info(f"Database: {get_db_vendor_name()}")
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logger.info(f"Service fee: {settings.lnbits_service_fee}")
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def get_db_vendor_name():
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db_url = settings.lnbits_database_url
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return (
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"PostgreSQL"
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if db_url and db_url.startswith("postgres://")
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else "CockroachDB"
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if db_url and db_url.startswith("cockroachdb://")
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else "SQLite"
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)
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def register_async_tasks(app):
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@app.route("/wallet/webhook")
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async def webhook_listener():
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return await webhook_handler()
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@app.on_event("startup")
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async def listeners():
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loop = asyncio.get_event_loop()
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loop.create_task(catch_everything_and_restart(check_pending_payments))
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loop.create_task(catch_everything_and_restart(invoice_listener))
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loop.create_task(catch_everything_and_restart(internal_invoice_listener))
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await register_task_listeners()
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# await run_deferred_async() # calle: doesn't do anyting?
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@app.on_event("shutdown")
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async def stop_listeners():
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pass
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def register_exception_handlers(app: FastAPI):
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@app.exception_handler(Exception)
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async def exception_handler(request: Request, exc: Exception):
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etype, _, tb = sys.exc_info()
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traceback.print_exception(etype, exc, tb)
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logger.error(f"Exception: {str(exc)}")
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# Only the browser sends "text/html" request
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# not fail proof, but everything else get's a JSON response
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if (
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request.headers
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and "accept" in request.headers
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and "text/html" in request.headers["accept"]
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):
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return template_renderer().TemplateResponse(
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"error.html", {"request": request, "err": f"Error: {str(exc)}"}
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)
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return JSONResponse(
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status_code=HTTPStatus.INTERNAL_SERVER_ERROR,
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content={"detail": str(exc)},
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)
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@app.exception_handler(RequestValidationError)
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async def validation_exception_handler(
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request: Request, exc: RequestValidationError
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):
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logger.error(f"RequestValidationError: {str(exc)}")
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# Only the browser sends "text/html" request
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# not fail proof, but everything else get's a JSON response
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if (
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request.headers
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and "accept" in request.headers
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and "text/html" in request.headers["accept"]
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):
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return template_renderer().TemplateResponse(
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"error.html",
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{"request": request, "err": f"Error: {str(exc)}"},
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)
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return JSONResponse(
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status_code=HTTPStatus.BAD_REQUEST,
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content={"detail": str(exc)},
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)
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@app.exception_handler(HTTPException)
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async def http_exception_handler(request: Request, exc: HTTPException):
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logger.error(f"HTTPException {exc.status_code}: {exc.detail}")
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# Only the browser sends "text/html" request
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# not fail proof, but everything else get's a JSON response
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if (
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request.headers
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and "accept" in request.headers
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and "text/html" in request.headers["accept"]
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):
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return template_renderer().TemplateResponse(
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"error.html",
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{
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"request": request,
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"err": f"HTTP Error {exc.status_code}: {exc.detail}",
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},
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)
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return JSONResponse(
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status_code=exc.status_code,
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content={"detail": exc.detail},
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)
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def configure_logger() -> None:
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logger.remove()
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log_level: str = "DEBUG" if settings.debug else "INFO"
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formatter = Formatter()
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logger.add(sys.stderr, level=log_level, format=formatter.format)
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logging.getLogger("uvicorn").handlers = [InterceptHandler()]
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logging.getLogger("uvicorn.access").handlers = [InterceptHandler()]
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class Formatter:
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def __init__(self):
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self.padding = 0
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self.minimal_fmt: str = "<green>{time:YYYY-MM-DD HH:mm:ss.SS}</green> | <level>{level}</level> | <level>{message}</level>\n"
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if settings.debug:
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self.fmt: str = (
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"<green>{time:YYYY-MM-DD HH:mm:ss.SS}</green> | <level>{level: <4}</level> | "
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"<cyan>{name}</cyan>:<cyan>{function}</cyan>:<cyan>{line}</cyan> | <level>{message}</level>\n"
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)
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else:
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self.fmt: str = self.minimal_fmt
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def format(self, record):
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function = "{function}".format(**record) # pylint: disable=C0209
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if function == "emit": # uvicorn logs
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return self.minimal_fmt
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return self.fmt
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class InterceptHandler(logging.Handler):
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def emit(self, record):
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try:
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level = logger.level(record.levelname).name
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except ValueError:
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level = record.levelno
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logger.log(level, record.getMessage())
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