airflow.models.variable

Module Contents

Classes

Variable

Variables are a generic way to store and retrieve arbitrary content or settings

Attributes

log

airflow.models.variable.log[source]
class airflow.models.variable.Variable(key=None, val=None, description=None)[source]

Bases: airflow.models.base.Base, airflow.utils.log.logging_mixin.LoggingMixin

Variables are a generic way to store and retrieve arbitrary content or settings as a simple key value store within Airflow.

__tablename__ = variable[source]
id[source]
key[source]
description[source]
is_encrypted[source]
on_db_load(self)[source]
__repr__(self)[source]

Return repr(self).

get_val(self)[source]

Get Airflow Variable from Metadata DB and decode it using the Fernet Key

set_val(self, value)[source]

Encode the specified value with Fernet Key and store it in Variables Table.

property val(cls)[source]

Get Airflow Variable from Metadata DB and decode it using the Fernet Key

classmethod setdefault(cls, key, default, description=None, deserialize_json=False)[source]

Like a Python builtin dict object, setdefault returns the current value for a key, and if it isn't there, stores the default value and returns it.

Parameters

  • key -- Dict key for this Variable

  • default -- Default value to set and return if the variable isn't already in the DB

  • deserialize_json -- Store this as a JSON encoded value in the DB and un-encode it when retrieving a value

Returns

Mixed

classmethod get(cls, key, default_var=__NO_DEFAULT_SENTINEL, deserialize_json=False)[source]

Gets a value for an Airflow Variable Key

Parameters

  • key (str) -- Variable Key

  • default_var (Any) -- Default value of the Variable if the Variable doesn't exist

  • deserialize_json (bool) -- Deserialize the value to a Python dict

classmethod set(cls, key, value, description=None, serialize_json=False, session=None)[source]

Sets a value for an Airflow Variable with a given Key. This operation will overwrite an existing variable.

Parameters

  • key (str) -- Variable Key

  • value (Any) -- Value to set for the Variable

  • description (Optional[str]) -- Description of the Variable

  • serialize_json (bool) -- Serialize the value to a JSON string

  • session (sqlalchemy.orm.Session) -- SQL Alchemy Sessions

classmethod update(cls, key, value, serialize_json=False, session=None)[source]

Updates a given Airflow Variable with the Provided value

Parameters

  • key (str) -- Variable Key

  • value (Any) -- Value to set for the Variable

  • serialize_json (bool) -- Serialize the value to a JSON string

  • session (sqlalchemy.orm.Session) -- SQL Alchemy Session

classmethod delete(cls, key, session=None)[source]

Delete an Airflow Variable for a given key

Parameters
rotate_fernet_key(self)[source]

Rotate Fernet Key

static check_for_write_conflict(key)[source]

Logs a warning if a variable exists outside of the metastore.

If we try to write a variable to the metastore while the same key exists in an environment variable or custom secrets backend, then subsequent reads will not read the set value.

Parameters

key (str) -- Variable Key

static get_variable_from_secrets(key)[source]

Get Airflow Variable by iterating over all Secret Backends.

Parameters

key (str) -- Variable Key

Returns

Variable Value

Return type

Optional[str]

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