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282 | class DagsterSlingFactory:
"""Factory to generate dagster definitions from Sling yaml config files."""
@cache
@staticmethod
def build_definitions(config_dir: Path) -> dg.Definitions:
"""Returns a Definitions object for a path that contains Sling yaml configs."""
connections = []
assets = []
freshness_checks = []
kind_map = {}
for config_path in os.listdir(config_dir):
if config_path.endswith(".yaml") or config_path.endswith(".yml"):
config_path = config_dir.joinpath(config_path).resolve()
with open(config_path) as file:
config = yaml.load(file, Loader=yaml.FullLoader)
if not config:
continue
if connection_configs := config.get("connections"):
connections, kind_map = DagsterSlingFactory._get_connections(
connection_configs, connections, kind_map
)
if replication_configs := config.get("replications"):
assets, freshness_checks = DagsterSlingFactory._get_replications(
replication_configs, freshness_checks, kind_map, assets
)
return dg.Definitions(
resources={"sling": SlingResource(connections=connections)},
assets=assets,
asset_checks=freshness_checks,
sensors=[
dg.build_sensor_for_freshness_checks(
freshness_checks=freshness_checks,
name="sling_freshness_checks_sensor",
)
],
)
@staticmethod
def _get_connections(
connection_configs, connections, kind_map
) -> tuple[list[SlingConnectionResource], dict[str, str]]:
"""Returns a list of SlingConnectionResource for connections in the Sling
yaml file.
"""
for connection_config in connection_configs:
if connection := DagsterSlingFactory._get_connection(connection_config):
source = connection_config.get("name")
kind = connection_config.get("type")
kind_map[source] = kind
connections.append(connection)
return connections, kind_map
@staticmethod
def _get_connection(connection_config: dict) -> SlingConnectionResource | None:
"""Returns a SlingConnectionResource for a connection in the Sling yaml file."""
for k, v in connection_config.items():
if isinstance(v, dict):
secret_name = list(v.keys())[0]
display_type = list(v.values())[0]
if display_type == "show":
connection_config[k] = get_secret(secret_name).get_value()
else:
connection_config[k] = get_secret(secret_name)
connection = SlingConnectionResource(**connection_config)
return connection
@staticmethod
def _get_replications(
replication_configs, freshness_checks, kind_map, assets
) -> tuple[list[dg.AssetsDefinition], list[dg.AssetChecksDefinition]]:
"""Returns a list of AssetsDefinitions for
replications in a Sling yaml file
"""
for replication_config in replication_configs:
if bool(os.getenv("DAGSTER_IS_DEV_CLI")):
replication_config = DagsterSlingFactory._set_dev_schema(
replication_config
)
assets_definition = DagsterSlingFactory._get_replication(replication_config)
kind = kind_map.get(replication_config.get("source", None), None)
dep_asset_specs = DagsterSlingFactory._get_sling_deps(
replication_config, kind
)
asset_freshness_checks = DagsterSlingFactory._get_freshness_checks(
replication_config
)
if asset_freshness_checks:
freshness_checks.extend(asset_freshness_checks)
if assets_definition:
assets.append(assets_definition)
if dep_asset_specs:
assets.extend(dep_asset_specs)
return assets, freshness_checks
@staticmethod
def _get_replication(config: dict) -> dg.AssetsDefinition:
"""Returns a AssetsDefinition for replication
in a Sling yaml file
"""
@sling_assets(
name=config["source"] + "_assets",
replication_config=config,
backfill_policy=dg.BackfillPolicy.single_run(),
dagster_sling_translator=CustomDagsterSlingTranslator(),
pool="sling",
)
def assets(
context: dg.AssetExecutionContext, sling: SlingResource
) -> Generator[SlingEventType, Any, None]:
if "defaults" not in config:
config["defaults"] = {}
try: # to inject start and end dates for partitioned runs
time_window = context.partition_time_window
if time_window:
if "source_options" not in config["defaults"]:
config["defaults"]["source_options"] = {}
format = "%Y-%m-%d %H:%M:%S"
start = time_window.start.strftime(format)
end = time_window.end.strftime(format)
config["defaults"]["source_options"]["range"] = f"{start},{end}"
except Exception: # run normal run if time window not provided
pass
yield from sling.replicate(
context=context,
replication_config=config,
dagster_sling_translator=CustomDagsterSlingTranslator(),
)
for row in sling.stream_raw_logs():
context.log.info(row)
return assets
@staticmethod
def _set_dev_schema(replication_config: dict) -> dict:
"""Override the desination schema set in the yaml file when the environment
is set to dev to point to a unique schema based on the developer.
"""
user = os.environ["DESTINATION__SNOWFLAKE__CREDENTIALS__USERNAME"].upper()
if default_object := replication_config["defaults"]["object"]:
schema, table = default_object.split(".")
replication_config["defaults"]["object"] = f"{schema}__{user}.{table}"
for stream, stream_config in list(
replication_config.get("streams", {}).items()
):
stream_config = stream_config or {}
if stream_object := stream_config.get("object"):
schema, table = stream_object.split(".")
replication_config["streams"][stream]["object"] = (
f"{schema}__{user}.{table}"
)
return replication_config
@staticmethod
def _get_sling_deps(
replication_config: dict, kind: str | None
) -> list[dg.AssetSpec] | None:
"""Create an external asset that is placed in the same prefix
as the asset, and assigned the correct resource kind.
"""
kinds = {kind} if kind else None
deps = []
for k in replication_config["streams"]:
schema, table = k.split(".")
dep = dg.AssetSpec(
key=[schema, "src", table], group_name=schema, kinds=kinds
)
deps.append(dep)
return deps
@staticmethod
def _get_freshness_checks(
replication_config: dict,
) -> list[dg.AssetChecksDefinition]:
"""Returns a list of AssetChecksDefinition for replication configs.
Configs supplied on the stream will take priority, otherwise the
default will be used.
"""
freshness_checks = []
default_freshness_check_config = (
get_nested(
replication_config, ["defaults", "meta", "dagster", "freshness_check"]
)
or {}
)
default_partition = get_nested(
replication_config, ["defaults", "meta", "dagster", "partition"]
)
streams = replication_config.get("streams", {})
for stream_name, steam_config in streams.items():
freshness_check_config = (
get_nested(steam_config, ["meta", "dagster", "freshness_check"]) or {}
)
partition = get_nested(steam_config, ["meta", "dagster", "partition"])
freshness_check_config = (
freshness_check_config | default_freshness_check_config
)
partition = partition or default_partition
if freshness_check_config:
if lower_bound_delta_seconds := freshness_check_config.pop(
"lower_bound_delta_seconds", None
):
lower_bound_delta = timedelta(
seconds=float(lower_bound_delta_seconds)
)
freshness_check_config["lower_bound_delta"] = lower_bound_delta
schema, table_name = stream_name.split(".")
asset_key = [schema, "raw", table_name]
freshness_check_config["assets"] = [asset_key]
try:
if partition in ["hourly", "daily", "weekly", "monthly"]:
freshness_check_config = sanitize_input_signature(
dg.build_time_partition_freshness_checks,
freshness_check_config,
)
time_partition_update_freshness_checks = (
dg.build_time_partition_freshness_checks(
**freshness_check_config
)
)
freshness_checks.extend(time_partition_update_freshness_checks)
else:
freshness_check_config = sanitize_input_signature(
dg.build_last_update_freshness_checks,
freshness_check_config,
)
last_update_freshness_checks = (
dg.build_last_update_freshness_checks(
**freshness_check_config
)
)
freshness_checks.extend(last_update_freshness_checks)
except TypeError as e:
raise TypeError(
"Error creating freshness check, check your configuration for "
f"'{asset_key}'. Supplied arguments: {freshness_check_config}"
) from e
return freshness_checks
|