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datalog.py
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datalog.py
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"""
The Datalog module contains all logic to declaratively create XTDB queries.
"""
from typing import Any, List, Literal, Optional, Tuple, Union
from xtdb.exceptions import XTDBException
class Clause:
commutative = True
idempotent = True
def compile(self, root: bool = True, *, separator=" ") -> str:
raise NotImplementedError
def format(self) -> str:
return self.compile(separator="\n ")
def _collect(self, *, separator=" ") -> List:
return [self.compile(root=False, separator=separator)]
def __str__(self) -> str:
return self.compile()
def __and__(self, other: Optional["Clause"]) -> "Clause":
if other is None:
return self
return self._and(other)
def _and(self, other: "Clause") -> "Clause":
if issubclass(type(other), Find):
raise XTDBException("Cannot perform a where-find. User find-where instead.")
return And([self, other])
def __or__(self, other: Optional["Clause"]) -> "Clause":
if other is None:
return self
return self._or(other)
def _or(self, other: "Clause") -> "Clause":
raise NotImplementedError
def __ror__(self, other: Optional["Clause"]) -> "Clause":
if other is None:
return self
raise NotImplementedError
def __rand__(self, other: Optional["Clause"]) -> "Clause":
if other is None:
return self
raise NotImplementedError
def __invert__(self):
raise NotImplementedError
class And(Clause):
def __init__(self, clauses: List[Clause], query_section: str = "where"):
self.clauses = clauses
self.query_section = query_section
def compile(self, root: bool = True, *, separator=" ") -> str:
compiled_clauses = self._collect(separator=separator)
expression = separator + separator.join(compiled_clauses)
if root:
return f":{self.query_section} [{expression}]"
return expression
def _collect(self, *, separator=" ") -> List:
collected = []
for clause in self.clauses:
collected.extend(clause._collect(separator=separator))
if all(clause.idempotent for clause in self.clauses):
collected = list(set(collected))
if all(clause.commutative for clause in self.clauses):
collected = sorted(collected)
return collected
def _or(self, other: Clause) -> "Clause":
if isinstance(other, (Where, WherePredicate)):
raise XTDBException("Cannot | on a single where, use & instead")
return Or([self, other])
def _and(self, other: Clause) -> Clause:
if self.query_section != "find" and issubclass(type(other), Find):
raise XTDBException("Cannot perform a where-find. User find-where instead.")
if self.query_section == "find" and isinstance(other, And) and other.query_section != "find":
return FindWhere(self, other)
if self.query_section == "find" and isinstance(other, (Where, Or, Not, NotJoin, WherePredicate)):
return FindWhere(self, other)
return And(self.clauses + [other], self.query_section)
def __invert__(self):
return Not(self.clauses)
class Or(Clause):
def __init__(self, clauses: List[Clause]):
self.clauses = clauses
def compile(self, root: bool = True, *, separator=" ") -> str:
collected = []
for clause in self.clauses:
if isinstance(clause, And):
collected.append(f"(and{clause.compile(root=False, separator=separator)})")
else:
collected.append(clause.compile(root=False, separator=separator))
if all(clause.idempotent for clause in self.clauses):
collected = list(set(collected))
if all(clause.commutative for clause in self.clauses):
collected = sorted(collected)
if root:
return f":where [(or{separator}{separator.join(collected)})]"
return f"(or{separator}{separator.join(collected)})"
def _or(self, other: Clause) -> Clause:
return Or(self.clauses + [other])
def __invert__(self):
raise XTDBException("Cannot use ~ on or clauses")
class Not(Clause):
def __init__(self, clauses: List[Clause]):
self.clauses = clauses
def compile(self, root: bool = True, *, separator=" ") -> str:
collected = []
for clause in self.clauses:
collected.append(clause.compile(root=False, separator=separator))
if all(clause.idempotent for clause in self.clauses):
collected = list(set(collected))
if all(clause.commutative for clause in self.clauses):
collected = sorted(collected)
if root:
return f":where [(not{separator}{separator.join(collected)})]"
return f"(not{separator}{separator.join(collected)})"
def _or(self, other: Clause) -> Clause:
return Or(self.clauses + [other])
def __invert__(self):
return And(self.clauses)
class NotJoin(Clause):
def __init__(self, variable: str, clauses: Optional[List] = None):
self.variable = variable
self.clauses = clauses or []
def compile(self, root: bool = True, *, separator=" ") -> str:
collected = []
for clause in self.clauses:
collected.append(clause.compile(root=False, separator=separator))
if all(clause.idempotent for clause in self.clauses):
collected = list(set(collected))
if all(clause.commutative for clause in self.clauses):
collected = sorted(collected)
if root:
return f":where [(not-join{separator}[{self.variable}] {separator.join(collected)})]"
return f"(not-join{separator}[{self.variable}] {separator.join(collected)})"
def _and(self, other: Clause) -> Clause:
return NotJoin(self.variable, self.clauses + [other])
def __invert__(self):
raise XTDBException("Cannot use ~ on not-join")
class OrJoin(Clause):
def __init__(self, variable: str, clauses: Optional[List] = None):
self.variable = variable
self.clauses = clauses or []
def compile(self, root: bool = True, *, separator=" ") -> str:
collected = []
for clause in self.clauses:
collected.append(clause.compile(root=False, separator=separator))
if all(clause.idempotent for clause in self.clauses):
collected = list(set(collected))
if all(clause.commutative for clause in self.clauses):
collected = sorted(collected)
if root:
return f":where [(or-join{separator}[{self.variable}] {separator.join(collected)})]"
return f"(or-join{separator}[{self.variable}] {separator.join(collected)})"
def _and(self, other: Clause) -> Clause:
return OrJoin(self.variable, self.clauses + [other])
def __invert__(self):
raise XTDBException("Cannot use ~ on or-join")
class Where(Clause):
def __init__(self, document: str, field: str, value: Any = ""):
self.document = document
self.field = field
self.value = value
def compile(self, root: bool = True, *, separator=" ") -> str:
if root:
return f":where [[ {self.document} :{self.field} {self.value} ]]"
return f"[ {self.document} :{self.field} {self.value} ]"
def _or(self, other: Clause) -> Clause:
if isinstance(other, And):
raise XTDBException("Cannot | on a single where, use & instead")
return Or([self, other])
def __invert__(self):
return Not([self])
class WherePredicate(Clause):
def __init__(self, operation: str, *args, bind: Optional[str] = None):
self.args = args
self.operation = operation
self.bind = bind
def compile(self, root: bool = True, *, separator=" ") -> str:
bind = self.bind or ""
if root:
return f":where [[ ({self.operation} {' '.join([str(arg) for arg in self.args])}) {bind}]]"
return f"[ ({self.operation} {' '.join(self.args)}) {bind}]"
def _or(self, other: Clause) -> Clause:
if isinstance(other, And):
raise XTDBException("Cannot | on a single predicate, use & instead")
return Or([self, other])
def __invert__(self):
return Not([self])
class Expression:
def __init__(self, statement: str):
self.statement = statement
def __str__(self):
return self.statement
class _BaseAggregate(Expression):
supported_aggregates = ["sum", "min", "max", "count", "avg", "median", "variance", "stddev", "distinct"]
supported_aggregates_with_arg = ["rand", "sample"]
def __init__(self, function: str, expression: str, *args):
if function not in self.supported_aggregates + self.supported_aggregates_with_arg:
raise XTDBException("Invalid aggregate function")
if function in self.supported_aggregates:
super().__init__(f"({function} {expression})")
if function in self.supported_aggregates_with_arg:
if len(args) != 1:
raise XTDBException("Invalid arguments to aggregate, it needs one argument: N")
super().__init__(f"({function} {' '.join(args)} {expression})")
class QueryKey(Clause):
def compile(self, root: bool = True, *, separator=" ") -> str:
raise NotImplementedError
def _or(self, other: Clause) -> Clause:
raise XTDBException("Cannot use | on query keys")
def _and(self, other: Clause) -> Clause:
return And([self, other])
def __invert__(self):
raise XTDBException("Cannot use ~ on query keys")
class Find(QueryKey):
commutative = False
idempotent = False
def __init__(self, expression: Union[str, Expression]):
self.expression = expression
def compile(self, root: bool = True, *, separator=" ") -> str:
if root:
return f":find [{self.expression}]"
return str(self.expression)
def _and(self, other: Clause) -> Clause:
if isinstance(other, And) and other.query_section != "find":
return FindWhere(self, other)
if isinstance(other, (Where, Or, Not, WherePredicate)):
return FindWhere(self, other)
return And([self, other], "find")
class In(QueryKey):
def __init__(self, in_args: Union[str, List[str], List[List[str]]], values: Union[str, List[str], List[List[str]]]):
if not in_args:
raise XTDBException("No in_arg supplied: cannot be empty")
if not values:
raise XTDBException("No values supplied: cannot be empty")
self.in_args = in_args
self.values = values
def compile(self, root: bool = True, *, separator=" ") -> str:
if isinstance(self.in_args, str):
return f" :in [{self.in_args}]"
if isinstance(self.in_args[0], str):
expression = " ".join([in_arg for in_arg in self.in_args if isinstance(in_arg, str)])
return f" :in [[{expression}]]"
nested_args = [" ".join(in_arg) for in_arg in self.in_args if isinstance(in_arg, List)]
expression = " ".join(nested_args)
return f" :in [[[{expression}]]]"
def compile_values(self) -> str:
if not isinstance(self.values, List):
return f' :in-args ["{self.values}"]'
if not isinstance(self.values[0], List):
expression = " ".join([f'"{value}"' for value in self.values])
return f" :in-args [[{expression}]]"
nested_values = ["[" + " ".join([f'"{value}"' for value in values]) + "]" for values in self.values]
expression = " ".join(nested_values)
return f" :in-args [[{expression}]]"
class OrderBy(QueryKey):
def __init__(self, fields: List[Tuple[str, Literal["asc", "desc"]]]):
if not all([field[1] in ["asc", "desc"] for field in fields]):
raise XTDBException("Only 'asc' and 'desc' allowed as ordering functions.")
self.fields = fields
def compile(self, root: bool = True, *, separator=" ") -> str:
expression = " ".join([self.compile_field(field) for field in self.fields])
return f" :order-by [{expression}]"
def compile_field(self, field: Tuple[str, Literal["asc", "desc"]]):
return f"[{field[0]} :{field[1]}]"
class Limit(QueryKey):
def __init__(self, limit: int):
self.limit = limit
def compile(self, root: bool = True, *, separator=" ") -> str:
return f" :limit {self.limit}"
class Offset(QueryKey):
def __init__(self, offset: int):
self.offset = offset
def compile(self, root: bool = True, *, separator=" ") -> str:
return f" :offset {self.offset}"
class Timeout(QueryKey):
def __init__(self, timeout: int):
self.timeout = timeout
def compile(self, root: bool = True, *, separator=" ") -> str:
return f" :timeout {self.timeout}"
class FindWhere(QueryKey):
def __init__(
self,
find: Clause,
where: Clause,
in_args: Optional[In] = None,
order_by: Optional[OrderBy] = None,
limit: Optional[Limit] = None,
offset: Optional[Offset] = None,
timeout: Optional[Timeout] = None,
):
self.find = find
self.where = where
self.in_args = in_args
self.order_by = order_by
self.limit = limit
self.offset = offset
self.timeout = timeout
def compile(self, root: bool = True, *, separator=" ") -> str:
q = f"{{:query {{{self.find.compile(separator=separator)} {self.where.compile(separator=separator)}"
if self.in_args is not None:
q += self.in_args.compile(separator=separator)
if self.order_by is not None:
q += self.order_by.compile(separator=separator)
if self.limit is not None:
q += self.limit.compile(separator=separator)
if self.offset is not None:
q += self.offset.compile(separator=separator)
if self.timeout is not None:
q += self.timeout.compile(separator=separator)
if self.in_args is not None:
return q + f"}}{self.in_args.compile_values()}}}"
return q + "}}"
def _and(self, other: Clause) -> Clause:
if isinstance(other, In):
return FindWhere(self.find, self.where, other, self.order_by, self.limit, self.offset, self.timeout)
if isinstance(other, OrderBy):
return FindWhere(self.find, self.where, self.in_args, other, self.limit, self.offset, self.timeout)
if isinstance(other, Limit):
return FindWhere(self.find, self.where, self.in_args, self.order_by, other, self.offset, self.timeout)
if isinstance(other, Offset):
return FindWhere(self.find, self.where, self.in_args, self.order_by, self.limit, other, self.timeout)
if isinstance(other, Timeout):
return FindWhere(self.find, self.where, self.in_args, self.order_by, self.limit, self.offset, other)
raise XTDBException("And operator is not supported for find-where clauses")
def _build_find_aggregation_class(name: str):
class Extended(Find):
def __init__(self, expression: str):
super().__init__(_BaseAggregate(name, expression))
return Extended
def _build_find_aggregation_class_with_argument(name: str):
class Extended(Find):
def __init__(self, expression: str, N: int):
super().__init__(_BaseAggregate(name, expression, str(N)))
return Extended
# Dynamically create classes extending the Find clause but do aggregations
Sum = _build_find_aggregation_class("sum")
Min = _build_find_aggregation_class("min")
Max = _build_find_aggregation_class("max")
Count = _build_find_aggregation_class("count")
CountDistinct = _build_find_aggregation_class("count-distinct")
Avg = _build_find_aggregation_class("avg")
Median = _build_find_aggregation_class("median")
Variance = _build_find_aggregation_class("variance")
Stddev = _build_find_aggregation_class("stddev")
Distinct = _build_find_aggregation_class("distinct")
Rand = _build_find_aggregation_class_with_argument("rand")
Sample = _build_find_aggregation_class_with_argument("sample")