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import json
import logging
import warnings
from json import JSONDecodeError
from typing import Dict, Optional, Union
from urllib.parse import parse_qsl, quote, unquote, urlencode, urlparse
from sqlalchemy import Boolean, Column, Integer, String, Text
from sqlalchemy.ext.declarative import declared_attr
from sqlalchemy.orm import reconstructor, synonym
from airflow.configuration import ensure_secrets_loaded
from airflow.exceptions import AirflowException, AirflowNotFoundException
from airflow.models.base import ID_LEN, Base
from airflow.models.crypto import get_fernet
from airflow.providers_manager import ProvidersManager
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.", DeprecationWarning)
return _parse_netloc_to_hostname(*args, **kwargs)
# Python automatically converts all letters to lowercase in hostname
# See: https://issues.apache.org/jira/browse/AIRFLOW-3615
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] __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(5000))
[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)
_extra = Column('extra', Text())
def __init__(
self,
conn_id: Optional[str] = None,
conn_type: Optional[str] = None,
description: Optional[str] = None,
host: Optional[str] = None,
login: Optional[str] = None,
password: Optional[str] = None,
schema: Optional[str] = None,
port: Optional[int] = None,
extra: Optional[Union[str, dict]] = None,
uri: Optional[str] = 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
self.host = 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.",
DeprecationWarning,
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",
DeprecationWarning,
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.", DeprecationWarning
)
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 = urlparse(uri)
conn_type = uri_parts.scheme
self.conn_type = self._normalize_conn_type(conn_type)
self.host = _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 '_' in self.conn_type:
self.log.warning(
f"Connection schemes (type: {str(self.conn_type)}) "
f"shall not contain '_' according to RFC3986."
)
uri = f"{str(self.conn_type).lower().replace('_', '-')}://"
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 self.host:
host_block += quote(self.host, 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: Optional[str] = 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) -> Optional[str]:
"""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: Optional[str]):
"""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
@declared_attr
[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))
@declared_attr
[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"""
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__).",
DeprecationWarning,
stacklevel=2,
)
return (
f"id: {self.conn_id}. Host: {self.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__).",
DeprecationWarning,
stacklevel=2,
)
return (
f"id: {self.conn_id}. Host: {self.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
@property
@classmethod
[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")
@classmethod
[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)
