301 lines
12 KiB
Python
301 lines
12 KiB
Python
from typing import Any, Optional, List, Tuple, Callable, Generator
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from neo4j import GraphDatabase
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from ast import literal_eval
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from .base import State, Edge, Node, Element, UUID
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class Neo4jState(State):
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def __init__(self, uri="bolt://localhost:7687", user="neo4j", password="tests"):
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self.driver = GraphDatabase.driver(uri, auth=(user, password))
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self.root = self.create_node()
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def close(self, *, clear=False):
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if clear:
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self._run_and_return(self._clear)
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self.driver.close()
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def _run_and_return(self, query: Callable, **kwargs):
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with self.driver.session() as session:
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result = session.write_transaction(query, **kwargs)
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return result
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@staticmethod
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def _clear(tx):
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tx.run("MATCH (n) "
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"DETACH DELETE n")
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@staticmethod
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def _existence_check(tx, eid, label="Element"):
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result = tx.run(f"MATCH (elem:{label}) "
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"WHERE elem.id = $eid "
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"RETURN elem.id",
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eid=eid)
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try:
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return result.single()[0]
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except TypeError:
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# No node found for nid
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# ergo, no edge created
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return None
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def create_node(self) -> Node:
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def query(tx, nid):
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result = tx.run("CREATE (n:Element:Node) "
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"SET n.id = $nid "
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"RETURN n.id",
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nid=nid)
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return result.single()[0]
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node = self._run_and_return(query, nid=str(self.new_id()))
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return UUID(node) if node is not None else None
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def create_edge(self, source: Element, target: Element) -> Optional[Edge]:
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def query(tx, eid, sid, tid):
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result = tx.run("MATCH (source), (target) "
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"WHERE source.id = $sid AND target.id = $tid "
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"CREATE (source) -[:Source]-> (e:Element:Edge) -[:Target]-> (target) "
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"SET e.id = $eid "
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"RETURN e.id",
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eid=eid, sid=sid, tid=tid)
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try:
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return result.single()[0]
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except TypeError:
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# No node found for sid and/or tid
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# ergo, no edge created
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return None
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edge = self._run_and_return(query, eid=str(self.new_id()), sid=str(source), tid=str(target))
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return UUID(edge) if edge is not None else None
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def create_nodevalue(self, value: Any) -> Optional[Node]:
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def query(tx, nid, val):
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result = tx.run("CREATE (n:Element:Node) "
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"SET n.id = $nid, n.value = $val "
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"RETURN n.id",
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nid=nid, val=val)
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return result.single()[0]
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if not self.is_valid_datavalue(value):
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return None
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node = self._run_and_return(query, nid=str(self.new_id()), val=repr(value))
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return UUID(node) if node is not None else None
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def create_dict(self, source: Element, value: Any, target: Element) -> Optional[Tuple[Edge, Edge, Node]]:
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if not self.is_valid_datavalue(value):
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return None
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edge_node = self.create_edge(source, target)
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val_node = self.create_nodevalue(value)
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if edge_node is not None and val_node is not None:
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self.create_edge(edge_node, val_node)
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def read_root(self) -> Node:
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return self.root
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def read_value(self, node: Node) -> Optional[Any]:
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def query(tx, nid):
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result = tx.run("MATCH (n:Node) "
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"WHERE n.id = $nid "
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"RETURN n.value",
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nid=nid)
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try:
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return result.single()[0]
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except TypeError:
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# No node found for nid
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return None
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value = self._run_and_return(query, nid=str(node))
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return literal_eval(value) if value is not None else None
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def read_outgoing(self, elem: Element) -> Optional[List[Edge]]:
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def query(tx, eid):
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result = tx.run("MATCH (elem:Element) -[:Source]-> (e:Edge) "
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"WHERE elem.id = $eid "
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"RETURN e.id",
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eid=eid)
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return result.value()
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source_exists = self._run_and_return(self._existence_check, eid=str(elem)) is not None
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if source_exists:
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result = self._run_and_return(query, eid=str(elem))
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return [UUID(x) for x in result] if result is not None else None
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def read_incoming(self, elem: Element) -> Optional[List[Edge]]:
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def query(tx, eid):
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result = tx.run("MATCH (elem:Element) <-[:Target]- (e:Edge) "
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"WHERE elem.id = $eid "
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"RETURN e.id",
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eid=eid)
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return result.value()
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target_exists = self._run_and_return(self._existence_check, eid=str(elem)) is not None
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if target_exists:
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result = self._run_and_return(query, eid=str(elem))
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return [UUID(x) for x in result] if result is not None else None
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def read_edge(self, edge: Edge) -> Tuple[Optional[Node], Optional[Node]]:
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def query(tx, eid):
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result = tx.run("MATCH (src) -[:Source]-> (e:Edge) -[:Target]-> (tgt)"
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"WHERE e.id = $eid "
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"RETURN src.id, tgt.id",
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eid=eid)
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return result.single()
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edge_exists = self._run_and_return(self._existence_check, eid=str(edge), label="Edge") is not None
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if edge_exists:
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try:
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src, tgt = self._run_and_return(query, eid=str(edge))
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return UUID(src), UUID(tgt)
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except TypeError:
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return None, None
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else:
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return None, None
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def read_dict(self, elem: Element, value: Any) -> Optional[Element]:
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def query(tx, eid, label_value):
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result = tx.run("MATCH (src) -[:Source]-> (e:Edge) -[:Target]-> (tgt), "
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"(e) -[:Source]-> (:Edge) -[:Target]-> (label)"
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"WHERE src.id = $eid "
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"AND label.value = $val "
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"RETURN tgt.id",
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eid=eid, val=label_value)
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try:
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return result.single()[0]
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except TypeError:
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# No edge found with given label
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return None
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elem_exists = self._run_and_return(self._existence_check, eid=str(elem)) is not None
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if elem_exists:
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if isinstance(value, UUID):
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return None
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result = self._run_and_return(query, eid=str(elem), label_value=repr(value))
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return UUID(result) if result is not None else None
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def read_dict_keys(self, elem: Element) -> Optional[List[Any]]:
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def query(tx, eid):
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result = tx.run("MATCH (src) -[:Source]-> (e:Edge) -[:Target]-> (), "
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"(e) -[:Source]-> (:Edge) -[:Target]-> (label)"
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"WHERE src.id = $eid "
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"RETURN label.id",
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eid=eid)
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try:
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return result.value()
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except TypeError:
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# No edge found with given label
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return None
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elem_exists = self._run_and_return(self._existence_check, eid=str(elem)) is not None
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if elem_exists:
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result = self._run_and_return(query, eid=str(elem))
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return [UUID(x) for x in result if x is not None]
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def read_dict_edge(self, elem: Element, value: Any) -> Optional[Edge]:
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def query(tx, eid, label_value):
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result = tx.run("MATCH (src) -[:Source]-> (e:Edge) -[:Target]-> (), "
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"(e) -[:Source]-> (:Edge) -[:Target]-> (label)"
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"WHERE src.id = $eid "
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"AND label.value = $val "
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"RETURN e.id",
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eid=eid, val=label_value)
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try:
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return result.single()[0]
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except TypeError:
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# No edge found with given label
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return None
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elem_exists = self._run_and_return(self._existence_check, eid=str(elem)) is not None
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if elem_exists:
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result = self._run_and_return(query, eid=str(elem), label_value=repr(value))
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return UUID(result) if result is not None else None
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def read_dict_node(self, elem: Element, value_node: Node) -> Optional[Element]:
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def query(tx, eid, label_id):
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result = tx.run("MATCH (src) -[:Source]-> (e:Edge) -[:Target]-> (tgt), "
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"(e) -[:Source]-> (:Edge) -[:Target]-> (label)"
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"WHERE src.id = $eid "
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"AND label.id = $lid "
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"RETURN tgt.id",
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eid=eid, lid=label_id)
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try:
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return result.single()[0]
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except TypeError:
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# No edge found with given label
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return None
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elem_exists = self._run_and_return(self._existence_check, eid=str(elem)) is not None
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if elem_exists:
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result = self._run_and_return(query, eid=str(elem), label_id=str(value_node))
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return UUID(result) if result is not None else None
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def read_dict_node_edge(self, elem: Element, value_node: Node) -> Optional[Edge]:
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def query(tx, eid, label_id):
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result = tx.run("MATCH (src) -[:Source]-> (e:Edge) -[:Target]-> (), "
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"(e) -[:Source]-> (:Edge) -[:Target]-> (label)"
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"WHERE src.id = $eid "
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"AND label.id = $lid "
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"RETURN e.id",
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eid=eid, lid=label_id)
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try:
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return result.single()[0]
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except TypeError:
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# No edge found with given label
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return None
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elem_exists = self._run_and_return(self._existence_check, eid=str(elem)) is not None
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if elem_exists:
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result = self._run_and_return(query, eid=str(elem), label_id=str(value_node))
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return UUID(result) if result is not None else None
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def read_reverse_dict(self, elem: Element, value: Any) -> Optional[List[Element]]:
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def query(tx, eid, label_value):
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result = tx.run("MATCH (src) -[:Source]-> (e:Edge) -[:Target]-> (tgt), "
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"(e) -[:Source]-> (:Edge) -[:Target]-> (label)"
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"WHERE tgt.id = $eid "
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"AND label.value = $val "
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"RETURN src.id",
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eid=eid, val=label_value)
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try:
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return result.value()
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except TypeError:
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# No edge found with given label
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return None
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elem_exists = self._run_and_return(self._existence_check, eid=str(elem)) is not None
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if elem_exists:
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result = self._run_and_return(query, eid=str(elem), label_value=repr(value))
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return [UUID(x) for x in result if x is not None]
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def delete_node(self, node: Node) -> None:
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def query(tx, nid):
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result = tx.run("MATCH (n:Node) "
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"WHERE n.id = $nid "
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"OPTIONAL MATCH (n) -- (e:Edge) "
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"DETACH DELETE n "
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"RETURN e.id",
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nid=nid)
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return result.value()
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to_be_deleted = self._run_and_return(query, nid=str(node))
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to_be_deleted = [UUID(x) for x in to_be_deleted if x is not None]
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for edge in to_be_deleted:
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self.delete_edge(edge)
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def delete_edge(self, edge: Edge) -> None:
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def query(tx, eid):
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result = tx.run("MATCH (e1:Edge) "
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"WHERE e1.id = $eid "
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"OPTIONAL MATCH (e1) -- (e2:Edge) "
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"WHERE (e1) -[:Source]-> (e2) "
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"OR (e1) <-[:Target]- (e2) "
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"DETACH DELETE e1 "
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"RETURN e2.id",
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eid=eid)
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return result.value()
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to_be_deleted = self._run_and_return(query, eid=str(edge))
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to_be_deleted = [UUID(x) for x in to_be_deleted if x is not None]
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for edge in to_be_deleted:
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self.delete_edge(edge)
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