124 lines
4.9 KiB
Python
124 lines
4.9 KiB
Python
from core.Errors import FileIntegrityError, UnsupportedApplicationVersionError, ApplicationAlreadyInstalledError
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from core.controllers.ApplicationController import ApplicationController
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from core.models.session.Application import Application
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from core.models.session.ApplicationVersion import ApplicationVersion
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from core.observers.ApplicationVersionObserver import ApplicationVersionObserver
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from core.observers.ConnectionObserver import ConnectionObserver
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from core.services.WebServiceApiService import WebServiceApiService
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from io import BytesIO
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from typing import Optional
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import hashlib
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import requests
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import shutil
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import tarfile
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class ApplicationVersionController:
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@staticmethod
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def get(application_code: str, version_number: str):
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return ApplicationVersion.find(application_code, version_number)
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@staticmethod
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def get_all(application: Optional[Application] = None):
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return ApplicationVersion.all(application)
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@staticmethod
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def install(application_version: ApplicationVersion, reinstall: bool = False, application_version_observer: Optional[ApplicationVersionObserver] = None, connection_observer: Optional[ConnectionObserver] = None):
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if not application_version.is_supported():
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raise UnsupportedApplicationVersionError('The application version in question is not supported.')
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if reinstall is True:
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ApplicationVersionController.uninstall(application_version)
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if application_version.is_installed():
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raise ApplicationAlreadyInstalledError('The application in question is already installed.')
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from core.controllers.ConnectionController import ConnectionController
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ConnectionController.with_preferred_connection(application_version, task=ApplicationVersionController.__install, application_version_observer=application_version_observer, connection_observer=connection_observer)
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@staticmethod
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def uninstall(application_version: ApplicationVersion):
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shutil.rmtree(application_version.get_installation_path(), ignore_errors=True)
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@staticmethod
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def _sync(proxies: Optional[dict] = None):
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applications = ApplicationController.get_all()
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application_versions = []
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for application_code in (application.code for application in applications):
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application_version_subset = WebServiceApiService.get_application_versions(application_code, proxies)
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for application_version in application_version_subset:
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application_versions.append(application_version)
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ApplicationVersion.truncate()
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ApplicationVersion.save_many(application_versions)
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@staticmethod
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def __install(application_version: ApplicationVersion, application_version_observer: Optional[ApplicationVersionObserver] = None, proxies: Optional[dict] = None):
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if application_version_observer is not None:
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application_version_observer.notify('downloading', application_version)
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if proxies is not None:
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response = requests.get(application_version.download_path, stream=True, proxies=proxies)
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else:
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response = requests.get(application_version.download_path, stream=True)
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if response.status_code == 200:
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response_size = int(response.headers.get('Content-Length', 0))
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response_buffer = BytesIO()
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block_size = 1024
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bytes_written = 0
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for data in response.iter_content(block_size):
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bytes_written += len(data)
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response_buffer.write(data)
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progress = (bytes_written / response_size) * 100 if response_size > 0 else 0
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application_version_observer.notify('download_progressing', application_version, dict(
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progress=progress
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))
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application_version_observer.notify('downloaded', application_version)
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response_buffer.seek(0)
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file_hash = ApplicationVersionController.__calculate_file_hash(response_buffer)
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if file_hash != application_version.file_hash:
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raise FileIntegrityError('Application version file integrity could not be verified.')
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with tarfile.open(fileobj=response_buffer, mode = 'r:gz') as tar_file:
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tar_file.extractall(application_version.get_installation_path())
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tar_file.close()
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with open(f'{application_version.get_installation_path()}/.sha3-512', 'w') as hash_file:
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hash_file.write(f'{file_hash}\n')
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hash_file.close()
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else:
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raise ConnectionError('The application version could not be downloaded.')
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@staticmethod
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def __calculate_file_hash(file):
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hasher = hashlib.sha3_512()
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buffer = file.read(65536)
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while len(buffer) > 0:
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hasher.update(buffer)
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buffer = file.read(65536)
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file.seek(0)
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return hasher.hexdigest()
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