Source code for airflow.models.connection

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from __future__ import annotations

import json
import logging
import warnings
from json import JSONDecodeError
from urllib.parse import parse_qsl, quote, unquote, urlencode, urlsplit

from sqlalchemy import Boolean, Column, Integer, String, Text
from sqlalchemy.orm import declared_attr, reconstructor, synonym

from airflow.configuration import ensure_secrets_loaded
from airflow.exceptions import AirflowException, AirflowNotFoundException, RemovedInAirflow3Warning
from airflow.models.base import ID_LEN, Base
from airflow.models.crypto import get_fernet
from airflow.utils.log.logging_mixin import LoggingMixin
from airflow.utils.log.secrets_masker import mask_secret
from airflow.utils.module_loading import import_string

[docs]log = logging.getLogger(__name__)
[docs]def parse_netloc_to_hostname(*args, **kwargs): """This method is deprecated.""" warnings.warn("This method is deprecated.", RemovedInAirflow3Warning) return _parse_netloc_to_hostname(*args, **kwargs)
# Python automatically converts all letters to lowercase in hostname # See: def _parse_netloc_to_hostname(uri_parts): """Parse a URI string to get correct Hostname.""" hostname = unquote(uri_parts.hostname or "") if "/" in hostname: hostname = uri_parts.netloc if "@" in hostname: hostname = hostname.rsplit("@", 1)[1] if ":" in hostname: hostname = hostname.split(":", 1)[0] hostname = unquote(hostname) return hostname
[docs]class Connection(Base, LoggingMixin): """ Placeholder to store information about different database instances connection information. The idea here is that scripts use references to database instances (conn_id) instead of hard coding hostname, logins and passwords when using operators or hooks. .. seealso:: For more information on how to use this class, see: :doc:`/howto/connection` :param conn_id: The connection ID. :param conn_type: The connection type. :param description: The connection description. :param host: The host. :param login: The login. :param password: The password. :param schema: The schema. :param port: The port number. :param extra: Extra metadata. Non-standard data such as private/SSH keys can be saved here. JSON encoded object. :param uri: URI address describing connection parameters. """
[docs] EXTRA_KEY = "__extra__"
[docs] __tablename__ = "connection"
[docs] id = Column(Integer(), primary_key=True)
[docs] conn_id = Column(String(ID_LEN), unique=True, nullable=False)
[docs] conn_type = Column(String(500), nullable=False)
[docs] description = Column(Text().with_variant(Text(5000), "mysql").with_variant(String(5000), "sqlite"))
[docs] host = Column(String(500))
[docs] schema = Column(String(500))
[docs] login = Column(String(500))
_password = Column("password", String(5000))
[docs] port = Column(Integer())
[docs] is_encrypted = Column(Boolean, unique=False, default=False)
[docs] is_extra_encrypted = Column(Boolean, unique=False, default=False)
_extra = Column("extra", Text()) def __init__( self, conn_id: str | None = None, conn_type: str | None = None, description: str | None = None, host: str | None = None, login: str | None = None, password: str | None = None, schema: str | None = None, port: int | None = None, extra: str | dict | None = None, uri: str | None = None, ): super().__init__() self.conn_id = conn_id self.description = description if extra and not isinstance(extra, str): extra = json.dumps(extra) if uri and (conn_type or host or login or password or schema or port or extra): raise AirflowException( "You must create an object using the URI or individual values " "(conn_type, host, login, password, schema, port or extra)." "You can't mix these two ways to create this object." ) if uri: self._parse_from_uri(uri) else: self.conn_type = conn_type = host self.login = login self.password = password self.schema = schema self.port = port self.extra = extra if self.extra: self._validate_extra(self.extra, self.conn_id) if self.password: mask_secret(self.password) @staticmethod def _validate_extra(extra, conn_id) -> None: """ Here we verify that ``extra`` is a JSON-encoded Python dict. From Airflow 3.0, we should no longer suppress these errors but raise instead. """ if extra is None: return None try: extra_parsed = json.loads(extra) if not isinstance(extra_parsed, dict): warnings.warn( "Encountered JSON value in `extra` which does not parse as a dictionary in " f"connection {conn_id!r}. From Airflow 3.0, the `extra` field must contain a JSON " "representation of a Python dict.", RemovedInAirflow3Warning, stacklevel=3, ) except json.JSONDecodeError: warnings.warn( f"Encountered non-JSON in `extra` field for connection {conn_id!r}. Support for " "non-JSON `extra` will be removed in Airflow 3.0", RemovedInAirflow3Warning, stacklevel=2, ) return None @reconstructor
[docs] def on_db_load(self): if self.password: mask_secret(self.password)
[docs] def parse_from_uri(self, **uri): """This method is deprecated. Please use uri parameter in constructor.""" warnings.warn( "This method is deprecated. Please use uri parameter in constructor.", RemovedInAirflow3Warning, ) self._parse_from_uri(**uri)
@staticmethod def _normalize_conn_type(conn_type): if conn_type == "postgresql": conn_type = "postgres" elif "-" in conn_type: conn_type = conn_type.replace("-", "_") return conn_type def _parse_from_uri(self, uri: str): uri_parts = urlsplit(uri) conn_type = uri_parts.scheme self.conn_type = self._normalize_conn_type(conn_type) = _parse_netloc_to_hostname(uri_parts) quoted_schema = uri_parts.path[1:] self.schema = unquote(quoted_schema) if quoted_schema else quoted_schema self.login = unquote(uri_parts.username) if uri_parts.username else uri_parts.username self.password = unquote(uri_parts.password) if uri_parts.password else uri_parts.password self.port = uri_parts.port if uri_parts.query: query = dict(parse_qsl(uri_parts.query, keep_blank_values=True)) if self.EXTRA_KEY in query: self.extra = query[self.EXTRA_KEY] else: self.extra = json.dumps(query)
[docs] def get_uri(self) -> str: """Return connection in URI format""" if self.conn_type and "_" in self.conn_type: self.log.warning( "Connection schemes (type: %s) shall not contain '_' according to RFC3986.", self.conn_type, ) if self.conn_type: uri = f"{self.conn_type.lower().replace('_', '-')}://" else: uri = "//" authority_block = "" if self.login is not None: authority_block += quote(self.login, safe="") if self.password is not None: authority_block += ":" + quote(self.password, safe="") if authority_block > "": authority_block += "@" uri += authority_block host_block = "" if host_block += quote(, safe="") if self.port: if host_block == "" and authority_block == "": host_block += f"@:{self.port}" else: host_block += f":{self.port}" if self.schema: host_block += f"/{quote(self.schema, safe='')}" uri += host_block if self.extra: try: query: str | None = urlencode(self.extra_dejson) except TypeError: query = None if query and self.extra_dejson == dict(parse_qsl(query, keep_blank_values=True)): uri += ("?" if self.schema else "/?") + query else: uri += ("?" if self.schema else "/?") + urlencode({self.EXTRA_KEY: self.extra}) return uri
[docs] def get_password(self) -> str | None: """Return encrypted password.""" if self._password and self.is_encrypted: fernet = get_fernet() if not fernet.is_encrypted: raise AirflowException( f"Can't decrypt encrypted password for login={self.login} " f"FERNET_KEY configuration is missing" ) return fernet.decrypt(bytes(self._password, "utf-8")).decode() else: return self._password
[docs] def set_password(self, value: str | None): """Encrypt password and set in object attribute.""" if value: fernet = get_fernet() self._password = fernet.encrypt(bytes(value, "utf-8")).decode() self.is_encrypted = fernet.is_encrypted
[docs] def password(cls): """Password. The value is decrypted/encrypted when reading/setting the value.""" return synonym("_password", descriptor=property(cls.get_password, cls.set_password))
[docs] def get_extra(self) -> str: """Return encrypted extra-data.""" if self._extra and self.is_extra_encrypted: fernet = get_fernet() if not fernet.is_encrypted: raise AirflowException( f"Can't decrypt `extra` params for login={self.login}, " f"FERNET_KEY configuration is missing" ) extra_val = fernet.decrypt(bytes(self._extra, "utf-8")).decode() else: extra_val = self._extra if extra_val: self._validate_extra(extra_val, self.conn_id) return extra_val
[docs] def set_extra(self, value: str): """Encrypt extra-data and save in object attribute to object.""" if value: self._validate_extra(value, self.conn_id) fernet = get_fernet() self._extra = fernet.encrypt(bytes(value, "utf-8")).decode() self.is_extra_encrypted = fernet.is_encrypted else: self._extra = value self.is_extra_encrypted = False
[docs] def extra(cls): """Extra data. The value is decrypted/encrypted when reading/setting the value.""" return synonym("_extra", descriptor=property(cls.get_extra, cls.set_extra))
[docs] def rotate_fernet_key(self): """Encrypts data with a new key. See: :ref:`security/fernet`""" fernet = get_fernet() if self._password and self.is_encrypted: self._password = fernet.rotate(self._password.encode("utf-8")).decode() if self._extra and self.is_extra_encrypted: self._extra = fernet.rotate(self._extra.encode("utf-8")).decode()
[docs] def get_hook(self, *, hook_params=None): """Return hook based on conn_type""" from airflow.providers_manager import ProvidersManager hook = ProvidersManager().hooks.get(self.conn_type, None) if hook is None: raise AirflowException(f'Unknown hook type "{self.conn_type}"') try: hook_class = import_string(hook.hook_class_name) except ImportError: warnings.warn( "Could not import %s when discovering %s %s", hook.hook_class_name, hook.hook_name, hook.package_name, ) raise if hook_params is None: hook_params = {} return hook_class(**{hook.connection_id_attribute_name: self.conn_id}, **hook_params)
[docs] def __repr__(self): return self.conn_id or ""
[docs] def log_info(self): """ This method is deprecated. You can read each field individually or use the default representation (`__repr__`). """ warnings.warn( "This method is deprecated. You can read each field individually or " "use the default representation (__repr__).", RemovedInAirflow3Warning, stacklevel=2, ) return ( f"id: {self.conn_id}. Host: {}, Port: {self.port}, Schema: {self.schema}, "
f"Login: {self.login}, Password: {'XXXXXXXX' if self.password else None}, " f"extra: {'XXXXXXXX' if self.extra_dejson else None}" )
[docs] def debug_info(self): """ This method is deprecated. You can read each field individually or use the default representation (`__repr__`). """ warnings.warn( "This method is deprecated. You can read each field individually or " "use the default representation (__repr__).", RemovedInAirflow3Warning, stacklevel=2, ) return ( f"id: {self.conn_id}. Host: {}, Port: {self.port}, Schema: {self.schema}, "
f"Login: {self.login}, Password: {'XXXXXXXX' if self.password else None}, " f"extra: {self.extra_dejson}" )
[docs] def test_connection(self): """Calls out get_hook method and executes test_connection method on that.""" status, message = False, "" try: hook = self.get_hook() if getattr(hook, "test_connection", False): status, message = hook.test_connection() else: message = ( f"Hook {hook.__class__.__name__} doesn't implement or inherit test_connection method" ) except Exception as e: message = str(e) return status, message
[docs] def extra_dejson(self) -> dict: """Returns the extra property by deserializing json.""" obj = {} if self.extra: try: obj = json.loads(self.extra) except JSONDecodeError: self.log.exception("Failed parsing the json for conn_id %s", self.conn_id) # Mask sensitive keys from this list mask_secret(obj) return obj
[docs] def get_connection_from_secrets(cls, conn_id: str) -> Connection: """ Get connection by conn_id. :param conn_id: connection id :return: connection """ for secrets_backend in ensure_secrets_loaded(): try: conn = secrets_backend.get_connection(conn_id=conn_id) if conn: return conn except Exception: log.exception( "Unable to retrieve connection from secrets backend (%s). " "Checking subsequent secrets backend.", type(secrets_backend).__name__, ) raise AirflowNotFoundException(f"The conn_id `{conn_id}` isn't defined")
[docs] def from_json(cls, value, conn_id=None) -> Connection: kwargs = json.loads(value) extra = kwargs.pop("extra", None) if extra: kwargs["extra"] = extra if isinstance(extra, str) else json.dumps(extra) conn_type = kwargs.pop("conn_type", None) if conn_type: kwargs["conn_type"] = cls._normalize_conn_type(conn_type) port = kwargs.pop("port", None) if port: try: kwargs["port"] = int(port) except ValueError: raise ValueError(f"Expected integer value for `port`, but got {port!r} instead.") return Connection(conn_id=conn_id, **kwargs)

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