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cli.py
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cli.py
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# special support for CLI argument parsing.
# TODO: Remove as part of https://github.com/dbt-labs/dbt-core/issues/6701
from dbt.flags import get_flags
from copy import deepcopy
import itertools
from dbt.clients.yaml_helper import yaml, Loader, Dumper # noqa: F401
from typing import Dict, List, Optional, Tuple, Any, Union
from dbt.contracts.selection import SelectorDefinition, SelectorFile
from dbt_common.exceptions import DbtInternalError, DbtValidationError
from .selector_spec import (
SelectionUnion,
SelectionSpec,
SelectionIntersection,
SelectionDifference,
SelectionCriteria,
IndirectSelection,
)
INTERSECTION_DELIMITER = ","
DEFAULT_INCLUDES: List[str] = ["fqn:*", "source:*", "exposure:*", "metric:*", "semantic_model:*"]
DEFAULT_EXCLUDES: List[str] = []
def parse_union(
components: List[str],
expect_exists: bool,
indirect_selection: IndirectSelection = IndirectSelection.Eager,
) -> SelectionUnion:
# turn ['a b', 'c'] -> ['a', 'b', 'c']
raw_specs = itertools.chain.from_iterable(r.split(" ") for r in components)
union_components: List[SelectionSpec] = []
flags = get_flags()
# ['a', 'b', 'c,d'] -> union('a', 'b', intersection('c', 'd'))
for raw_spec in raw_specs:
intersection_components: List[SelectionSpec] = [
SelectionCriteria.from_single_spec(part, indirect_selection=indirect_selection)
for part in raw_spec.split(INTERSECTION_DELIMITER)
]
union_components.append(
SelectionIntersection(
components=intersection_components,
expect_exists=expect_exists,
raw=raw_spec,
indirect_selection=IndirectSelection(flags.INDIRECT_SELECTION),
)
)
return SelectionUnion(
components=union_components,
expect_exists=False,
raw=components,
indirect_selection=IndirectSelection(flags.INDIRECT_SELECTION),
)
def parse_union_from_default(
raw: Optional[List[str]],
default: List[str],
indirect_selection: IndirectSelection = IndirectSelection.Eager,
) -> SelectionUnion:
components: List[str]
expect_exists: bool
if raw is None:
return parse_union(
components=default, expect_exists=False, indirect_selection=indirect_selection
)
else:
return parse_union(
components=raw, expect_exists=True, indirect_selection=indirect_selection
)
def parse_difference(
include: Optional[List[str]], exclude: Optional[List[str]], indirect_selection: Any
) -> SelectionDifference:
if include == ():
include = None
included = parse_union_from_default(
include, DEFAULT_INCLUDES, indirect_selection=IndirectSelection(indirect_selection)
)
flags = get_flags()
excluded = parse_union_from_default(
exclude, DEFAULT_EXCLUDES, indirect_selection=IndirectSelection(flags.INDIRECT_SELECTION)
)
return SelectionDifference(
components=[included, excluded],
indirect_selection=IndirectSelection(flags.INDIRECT_SELECTION),
)
RawDefinition = Union[str, Dict[str, Any]]
def _get_list_dicts(dct: Dict[str, Any], key: str) -> List[RawDefinition]:
result: List[RawDefinition] = []
if key not in dct:
raise DbtInternalError(f"Expected to find key {key} in dict, only found {list(dct)}")
values = dct[key]
if not isinstance(values, list):
raise DbtValidationError(f'Invalid value for key "{key}". Expected a list.')
for value in values:
if isinstance(value, dict):
for value_key in value:
if not isinstance(value_key, str):
raise DbtValidationError(
f'Expected all keys to "{key}" dict to be strings, '
f'but "{value_key}" is a "{type(value_key)}"'
)
result.append(value)
elif isinstance(value, str):
result.append(value)
else:
raise DbtValidationError(
f'Invalid value type {type(value)} in key "{key}", expected '
f"dict or str (value: {value})."
)
return result
def _parse_exclusions(definition, result={}) -> Optional[SelectionSpec]:
exclusions = _get_list_dicts(definition, "exclude")
parsed_exclusions = [parse_from_definition(excl, result=result) for excl in exclusions]
if len(parsed_exclusions) == 1:
return parsed_exclusions[0]
elif len(parsed_exclusions) > 1:
return SelectionUnion(components=parsed_exclusions, raw=exclusions)
else:
return None
def _parse_include_exclude_subdefs(
definitions: List[RawDefinition], result={}
) -> Tuple[List[SelectionSpec], Optional[SelectionSpec]]:
include_parts: List[SelectionSpec] = []
diff_arg: Optional[SelectionSpec] = None
for definition in definitions:
if isinstance(definition, dict) and "exclude" in definition:
# do not allow multiple exclude: defs at the same level
if diff_arg is not None:
yaml_sel_cfg = yaml.dump(definition)
raise DbtValidationError(
f"You cannot provide multiple exclude arguments to the "
f"same selector set operator:\n{yaml_sel_cfg}"
)
diff_arg = _parse_exclusions(definition, result=result)
else:
include_parts.append(parse_from_definition(definition, result=result))
return (include_parts, diff_arg)
def parse_union_definition(definition: Dict[str, Any], result={}) -> SelectionSpec:
union_def_parts = _get_list_dicts(definition, "union")
include, exclude = _parse_include_exclude_subdefs(union_def_parts, result=result)
union = SelectionUnion(components=include)
if exclude is None:
union.raw = definition
return union
else:
return SelectionDifference(components=[union, exclude], raw=definition)
def parse_intersection_definition(definition: Dict[str, Any], result={}) -> SelectionSpec:
intersection_def_parts = _get_list_dicts(definition, "intersection")
include, exclude = _parse_include_exclude_subdefs(intersection_def_parts, result=result)
intersection = SelectionIntersection(components=include)
if exclude is None:
intersection.raw = definition
return intersection
else:
return SelectionDifference(components=[intersection, exclude], raw=definition)
def parse_dict_definition(definition: Dict[str, Any], result={}) -> SelectionSpec:
diff_arg: Optional[SelectionSpec] = None
if len(definition) == 1:
key = list(definition)[0]
value = definition[key]
if not isinstance(key, str):
raise DbtValidationError(
f'Expected definition key to be a "str", got one of type ' f'"{type(key)}" ({key})'
)
dct = {
"method": key,
"value": value,
}
elif definition.get("method") == "selector":
sel_def = definition.get("value")
if sel_def not in result:
raise DbtValidationError(f"Existing selector definition for {sel_def} not found.")
return result[definition["value"]]["definition"]
elif "method" in definition and "value" in definition:
dct = definition
if "exclude" in definition:
diff_arg = _parse_exclusions(definition, result=result)
dct = {k: v for k, v in dct.items() if k != "exclude"}
else:
raise DbtValidationError(
f'Expected either 1 key or else "method" '
f'and "value" keys, but got {list(definition)}'
)
# if key isn't a valid method name, this will raise
base = SelectionCriteria.selection_criteria_from_dict(definition, dct)
if diff_arg is None:
return base
else:
return SelectionDifference(components=[base, diff_arg])
def parse_from_definition(
definition: RawDefinition,
rootlevel=False,
result: Dict[str, Dict[str, Union[SelectionSpec, bool]]] = {},
) -> SelectionSpec:
if (
isinstance(definition, dict)
and ("union" in definition or "intersection" in definition)
and rootlevel
and len(definition) > 1
):
keys = ",".join(definition.keys())
raise DbtValidationError(
f"Only a single 'union' or 'intersection' key is allowed "
f"in a root level selector definition; found {keys}."
)
if isinstance(definition, str):
return SelectionCriteria.from_single_spec(definition)
elif "union" in definition:
return parse_union_definition(definition, result=result)
elif "intersection" in definition:
return parse_intersection_definition(definition, result=result)
elif isinstance(definition, dict):
return parse_dict_definition(definition, result=result)
else:
raise DbtValidationError(
f"Expected to find union, intersection, str or dict, instead "
f"found {type(definition)}: {definition}"
)
def parse_from_selectors_definition(
source: SelectorFile,
) -> Dict[str, Dict[str, Union[SelectionSpec, bool]]]:
result: Dict[str, Dict[str, Union[SelectionSpec, bool]]] = {}
selector: SelectorDefinition
for selector in source.selectors:
result[selector.name] = {
"default": selector.default,
"definition": parse_from_definition(
selector.definition, rootlevel=True, result=deepcopy(result)
),
}
return result