Source code for tests.system.openlineage.transport.variable

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from __future__ import annotations

from typing import TYPE_CHECKING

from openlineage.client.serde import Serde
from openlineage.client.transport import Transport, get_default_factory

from airflow.models.variable import Variable

if TYPE_CHECKING:
    from openlineage.client.client import Event


[docs]class VariableTransport(Transport):
    """
    This transport sends OpenLineage events to Variables.

    Key schema is <DAG_ID>.<TASK_ID>.event.<EVENT_TYPE>.
    It's made to be used in system tests, stored data read by OpenLineageTestOperator.
    """

[docs]    kind = "variable"

[docs]    def emit(self, event: Event) -> None:
        key = f"{event.job.name}.event.{event.eventType.value.lower()}"  # type: ignore[union-attr]
        event_str = Serde.to_json(event)
        if (var := Variable.get(key=key, default_var=None, deserialize_json=True)) is not None:
            Variable.set(key=key, value=var + [event_str], serialize_json=True)
        else:
            Variable.set(key=key, value=[event_str], serialize_json=True)


get_default_factory().register_transport(VariableTransport.kind, VariableTransport)