Source code for dagster.core.launcher.default_run_launcher

import time
import weakref

import grpc
from dagster import check, seven
from dagster.core.errors import DagsterLaunchFailedError
from dagster.core.host_representation import ExternalPipeline
from dagster.core.host_representation.handle import (
from dagster.core.instance import DagsterInstance
from import PipelineRun
from import GRPC_INFO_TAG
from dagster.grpc.client import DagsterGrpcClient
from dagster.grpc.types import (
from dagster.serdes import ConfigurableClass
from dagster.utils import merge_dicts

from .base import RunLauncher


[docs]class DefaultRunLauncher(RunLauncher, ConfigurableClass): """Launches runs against running GRPC servers. """ def __init__(self, inst_data=None): self._instance_weakref = None self._inst_data = inst_data # Used for test cleanup purposes only self._run_id_to_repository_location_handle_cache = {} @property def inst_data(self): return self._inst_data @classmethod def config_type(cls): return {} @staticmethod def from_config_value(inst_data, config_value): return DefaultRunLauncher(inst_data=inst_data) @property def _instance(self): return self._instance_weakref() if self._instance_weakref else None def initialize(self, instance): check.inst_param(instance, "instance", DagsterInstance) check.invariant(self._instance is None, "Must only call initialize once") # Store a weakref to avoid a circular reference / enable GC self._instance_weakref = weakref.ref(instance) def launch_run(self, instance, run, external_pipeline): check.inst_param(run, "run", PipelineRun) check.inst_param(external_pipeline, "external_pipeline", ExternalPipeline) repository_location_handle = external_pipeline.repository_handle.repository_location_handle check.inst( repository_location_handle, GRPC_REPOSITORY_LOCATION_HANDLE_TYPES, "DefaultRunLauncher: Can't launch runs for pipeline not loaded from a GRPC server", ) self._instance.add_run_tags( run.run_id, { GRPC_INFO_TAG: seven.json.dumps( merge_dicts( {"host":}, {"port": repository_location_handle.port} if repository_location_handle.port else {"socket": repository_location_handle.socket}, ) ) }, ) res = repository_location_handle.client.start_run( ExecuteExternalPipelineArgs( pipeline_origin=external_pipeline.get_external_origin(), pipeline_run_id=run.run_id, instance_ref=self._instance.get_ref(), ) ) if not res.success: raise ( DagsterLaunchFailedError( res.message, serializable_error_info=res.serializable_error_info ) ) self._run_id_to_repository_location_handle_cache[run.run_id] = repository_location_handle return run def _get_grpc_client_for_termination(self, run_id): if not self._instance: return None run = self._instance.get_run_by_id(run_id) if not run or run.is_finished: return None tags = run.tags if GRPC_INFO_TAG not in tags: return None grpc_info = seven.json.loads(tags.get(GRPC_INFO_TAG)) return DagsterGrpcClient( port=grpc_info.get("port"), socket=grpc_info.get("socket"), host=grpc_info.get("host") ) def can_terminate(self, run_id): check.str_param(run_id, "run_id") client = self._get_grpc_client_for_termination(run_id) if not client: return False try: res = client.can_cancel_execution(CanCancelExecutionRequest(run_id=run_id), timeout=5) except grpc._channel._InactiveRpcError: # pylint: disable=protected-access # Server that created the run may no longer exist return False return res.can_cancel def terminate(self, run_id): check.str_param(run_id, "run_id") if not self._instance: return False run = self._instance.get_run_by_id(run_id) if not run: return False client = self._get_grpc_client_for_termination(run_id) if not client: self._instance.report_engine_event( message="Unable to get grpc client to send termination request to.", pipeline_run=run, cls=self.__class__, ) return False self._instance.report_run_canceling(run) res = client.cancel_execution(CancelExecutionRequest(run_id=run_id)) return res.success def join(self, timeout=30): # If this hasn't been initialized at all, we can just do a noop if not self._instance: return total_time = 0 interval = 0.01 while True: active_run_ids = [ run_id for run_id in self._run_id_to_repository_location_handle_cache.keys() if ( self._instance.get_run_by_id(run_id) and not self._instance.get_run_by_id(run_id).is_finished ) ] if len(active_run_ids) == 0: return if total_time >= timeout: raise Exception( "Timed out waiting for these runs to finish: {active_run_ids}".format( active_run_ids=repr(active_run_ids) ) ) total_time += interval time.sleep(interval) interval = interval * 2 def cleanup_managed_grpc_servers(self): """Shut down any managed grpc servers that used this run launcher to start a run. Should only be used for teardown purposes within tests (generally it's fine for a server to out-live the host process, since it might be finishing an execution and will automatically shut itself down once it no longer receives a heartbeat from the host process). But in tests, gRPC servers access the DagsterInstance during execution, so we need to shut them down before we can safely remove the temporary directory created for the DagsterInstance. """ for repository_location_handle in self._run_id_to_repository_location_handle_cache.values(): if isinstance(repository_location_handle, ManagedGrpcPythonEnvRepositoryLocationHandle): check.invariant( repository_location_handle.is_cleaned_up, "ManagedGrpcPythonRepositoryLocationHandle was not cleaned up " "before test teardown. This may indicate that the handle is not " "being used as a contextmanager.", ) repository_location_handle.grpc_server_process.wait()