feat: nebula graph add time label (#1383)

Co-authored-by: Wendong <[email protected]>
Co-authored-by: Wendong-Fan <[email protected]>

camel/storages/graph_storages/nebula_graph.py

@@ -15,7 +15,7 @@
 import logging
 import re
 import time
-from typing import TYPE_CHECKING, Any, Dict, List, Tuple
+from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple
 
 from camel.storages.graph_storages.base import BaseGraphStorage
 from camel.storages.graph_storages.graph_element import (
@@ -203,46 +203,62 @@ def add_graph_elements(
     def ensure_edge_type_exists(
         self,
         edge_type: str,
+        time_label: Optional[str] = None,
     ) -> None:
         r"""Ensures that a specified edge type exists in the NebulaGraph
         database. If the edge type already exists, this method does nothing.
 
         Args:
             edge_type (str): The name of the edge type to be created.
+            time_label (str, optional): A specific timestamp to set as the
+                default value for the time label property. If not
+                provided, no timestamp will be added. (default: :obj:`None`)
 
         Raises:
             Exception: If the edge type creation fails after multiple retry
                 attempts, an exception is raised with the error message.
         """
-        create_edge_stmt = f'CREATE EDGE IF NOT EXISTS {edge_type}()'
+        create_edge_stmt = f"CREATE EDGE IF NOT EXISTS {edge_type} ()"
+        if time_label is not None:
+            time_label = self._validate_time_label(time_label)
+            create_edge_stmt = f"""CREATE EDGE IF NOT EXISTS {edge_type}
+            (time_label DATETIME DEFAULT {time_label})"""
 
         for attempt in range(MAX_RETRIES):
             res = self.query(create_edge_stmt)
             if res.is_succeeded():
-                return  # Tag creation succeeded, exit the method
+                return  # Edge type creation succeeded
 
             if attempt < MAX_RETRIES - 1:
                 time.sleep(RETRY_DELAY)
             else:
                 # Final attempt failed, raise an exception
                 raise Exception(
-                    f"Failed to create tag `{edge_type}` after "
+                    f"Failed to create edge type `{edge_type}` after "
                     f"{MAX_RETRIES} attempts: {res.error_msg()}"
                 )
 
-    def ensure_tag_exists(self, tag_name: str) -> None:
+    def ensure_tag_exists(
+        self, tag_name: str, time_label: Optional[str] = None
+    ) -> None:
         r"""Ensures a tag is created in the NebulaGraph database. If the tag
         already exists, it does nothing.
 
         Args:
             tag_name (str): The name of the tag to be created.
+            time_label (str, optional): A specific timestamp to set as the
+                default value for the time label property. If not provided,
+                no timestamp will be added. (default: :obj:`None`)
 
         Raises:
             Exception: If the tag creation fails after retries, an exception
                 is raised with the error message.
         """
-
-        create_tag_stmt = f'CREATE TAG IF NOT EXISTS {tag_name}()'
+        create_tag_stmt = f"CREATE TAG IF NOT EXISTS {tag_name} ()"
+        if time_label is not None:
+            time_label = self._validate_time_label(time_label)
+            create_tag_stmt = f"""CREATE TAG IF NOT EXISTS {tag_name}
+            (time_label DATETIME DEFAULT {time_label})"""
 
         for attempt in range(MAX_RETRIES):
             res = self.query(create_tag_stmt)
@@ -262,27 +278,39 @@ def add_node(
         self,
         node_id: str,
         tag_name: str,
+        time_label: Optional[str] = None,
     ) -> None:
         r"""Add a node with the specified tag and properties.
 
         Args:
             node_id (str): The ID of the node.
             tag_name (str): The tag name of the node.
+            time_label (str, optional): A specific timestamp to set for
+                the node's time label property. If not provided, no timestamp
+                will be added. (default: :obj:`None`)
         """
         node_id = re.sub(r'[^a-zA-Z0-9\u4e00-\u9fa5]', '', node_id)
         tag_name = re.sub(r'[^a-zA-Z0-9\u4e00-\u9fa5]', '', tag_name)
 
-        self.ensure_tag_exists(tag_name)
+        self.ensure_tag_exists(tag_name, time_label)
 
-        # Insert node without properties
-        insert_stmt = (
-            f'INSERT VERTEX IF NOT EXISTS {tag_name}() VALUES "{node_id}":()'
-        )
+        # Insert node with or without time_label property
+        if time_label is not None:
+            time_label = self._validate_time_label(time_label)
+            insert_stmt = (
+                f'INSERT VERTEX IF NOT EXISTS {tag_name}(time_label) VALUES '
+                f'"{node_id}":("{time_label}")'
+            )
+        else:
+            insert_stmt = (
+                f'INSERT VERTEX IF NOT EXISTS {tag_name}() VALUES '
+                f'"{node_id}":()'
+            )
 
         for attempt in range(MAX_RETRIES):
             res = self.query(insert_stmt)
             if res.is_succeeded():
-                return  # Tag creation succeeded, exit the method
+                return  # Node creation succeeded, exit the method
 
             if attempt < MAX_RETRIES - 1:
                 time.sleep(RETRY_DELAY)
@@ -348,7 +376,7 @@ def refresh_schema(self) -> None:
     @property
     def get_structured_schema(self) -> Dict[str, Any]:
         r"""Generates a structured schema consisting of node and relationship
-        properties, relationships, and metadata.
+        properties, relationships, and metadata, including timestamps.
 
         Returns:
             Dict[str, Any]: A dictionary representing the structured schema.
@@ -419,6 +447,7 @@ def add_triplet(
         subj: str,
         obj: str,
         rel: str,
+        time_label: Optional[str] = None,
     ) -> None:
         r"""Adds a relationship (triplet) between two entities in the Nebula
         Graph database.
@@ -427,28 +456,44 @@ def add_triplet(
             subj (str): The identifier for the subject entity.
             obj (str): The identifier for the object entity.
             rel (str): The relationship between the subject and object.
+            time_label (str, optional): A specific timestamp to set for the
+                time label property of the relationship. If not provided,
+                no timestamp will be added. (default: :obj:`None`)
+
+        Raises:
+            ValueError: If the time_label format is invalid.
+            Exception: If creating the relationship fails.
         """
         subj = re.sub(r'[^a-zA-Z0-9\u4e00-\u9fa5]', '', subj)
         obj = re.sub(r'[^a-zA-Z0-9\u4e00-\u9fa5]', '', obj)
         rel = re.sub(r'[^a-zA-Z0-9\u4e00-\u9fa5]', '', rel)
 
         self.ensure_tag_exists(subj)
         self.ensure_tag_exists(obj)
-        self.ensure_edge_type_exists(rel)
+        self.ensure_edge_type_exists(rel, time_label)
         self.add_node(node_id=subj, tag_name=subj)
         self.add_node(node_id=obj, tag_name=obj)
 
-        # Avoid latenicy
+        # Avoid latency
         time.sleep(1)
 
-        insert_stmt = (
-            f'INSERT EDGE IF NOT EXISTS {rel}() VALUES "{subj}"->"{obj}":();'
-        )
+        # Create edge with or without time_label property
+        if time_label is not None:
+            time_label = self._validate_time_label(time_label)
+            insert_stmt = (
+                f'INSERT EDGE IF NOT EXISTS {rel}(time_label) VALUES '
+                f'"{subj}"->"{obj}":("{time_label}")'
+            )
+        else:
+            insert_stmt = (
+                f'INSERT EDGE IF NOT EXISTS {rel}() VALUES '
+                f'"{subj}"->"{obj}":()'
+            )
 
         res = self.query(insert_stmt)
         if not res.is_succeeded():
             raise Exception(
-                f'create relationship `]{subj}` -> `{obj}`'
+                f'create relationship `{subj}` -> `{obj}`'
                 + f'failed: {res.error_msg()}'
             )
 
@@ -568,3 +613,27 @@ def get_relationship_properties(
             )
 
         return rel_schema_props, rel_structure_props
+
+    def _validate_time_label(self, time_label: str) -> str:
+        r"""Validates the format of a time label string.
+
+        Args:
+            time_label (str): The time label string to validate.
+                Should be in format 'YYYY-MM-DDThh:mm:ss'.
+
+        Returns:
+            str: The validated time label.
+
+        Raises:
+            ValueError: If the time label format is invalid.
+        """
+        try:
+            # Check if the format matches YYYY-MM-DDThh:mm:ss
+            pattern = r'^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}$'
+            if not re.match(pattern, time_label):
+                raise ValueError(
+                    "Time label must be in format 'YYYY-MM-DDThh:mm:ss'"
+                )
+            return time_label
+        except Exception as e:
+            raise ValueError(f"Invalid time label format: {e!s}")

test/storages/graph_storages/test_nebula_graph.py

@@ -12,7 +12,7 @@
 # limitations under the License.
 # ========= Copyright 2023-2024 @ CAMEL-AI.org. All Rights Reserved. =========
 import unittest
-from unittest.mock import Mock, patch
+from unittest.mock import Mock, call, patch
 
 from unstructured.documents.elements import Element
 
@@ -106,7 +106,7 @@ def test_add_node(self):
 
         self.graph.add_node(node_id, tag_name)
 
-        self.graph.ensure_tag_exists.assert_called_with(tag_name)
+        self.graph.ensure_tag_exists.assert_has_calls([call(tag_name, None)])
         insert_stmt = (
             f'INSERT VERTEX IF NOT EXISTS {tag_name}() VALUES "{node_id}":()'
         )
@@ -121,7 +121,7 @@ def test_ensure_tag_exists_success(self):
 
         self.graph.ensure_tag_exists(tag_name)
 
-        create_tag_stmt = f'CREATE TAG IF NOT EXISTS {tag_name}()'
+        create_tag_stmt = f'CREATE TAG IF NOT EXISTS {tag_name} ()'
         self.graph.query.assert_called_with(create_tag_stmt)
 
     @patch('time.sleep', return_value=None)
@@ -153,13 +153,12 @@ def test_add_triplet(self):
 
         self.graph.add_triplet(subj, obj, rel)
 
-        self.graph.ensure_tag_exists.assert_any_call(subj)
-        self.graph.ensure_tag_exists.assert_any_call(obj)
-        self.graph.ensure_edge_type_exists.assert_called_with(rel)
+        self.graph.ensure_tag_exists.assert_has_calls([call(subj), call(obj)])
+        self.graph.ensure_edge_type_exists.assert_has_calls([call(rel, None)])
         self.graph.add_node.assert_any_call(node_id=subj, tag_name=subj)
         self.graph.add_node.assert_any_call(node_id=obj, tag_name=obj)
         insert_stmt = (
-            f'INSERT EDGE IF NOT EXISTS {rel}() VALUES "{subj}"->"{obj}":();'
+            f'INSERT EDGE IF NOT EXISTS {rel}() VALUES "{subj}"->"{obj}":()'
         )
         self.graph.query.assert_called_with(insert_stmt)
 
@@ -401,24 +400,24 @@ def test_get_schema(self):
     def test_get_structured_schema(self):
         self.graph.get_node_properties = Mock(
             return_value=(
-                ['Node.prop'],
-                [{'labels': 'Node', 'properties': ['prop']}],
+                ['Person.name', 'Person.age'],
+                [{'labels': 'Person', 'properties': ['name', 'age']}],
             )
         )
         self.graph.get_relationship_properties = Mock(
             return_value=(
-                ['Rel.prop'],
-                [{'type': 'Rel', 'properties': ['prop']}],
+                ['KNOWS.since'],
+                [{'type': 'KNOWS', 'properties': ['since']}],
             )
         )
-        self.graph.get_relationship_types = Mock(return_value=['RELATES_TO'])
-        self.graph.get_indexes = Mock(return_value=['index1'])
+        self.graph.get_relationship_types = Mock(return_value=['KNOWS'])
+        self.graph.get_indexes = Mock(return_value=[])
         structured_schema = self.graph.get_structured_schema
         expected_schema = {
-            "node_props": {'Node': ['prop']},
-            "rel_props": {'Rel': ['prop']},
-            "relationships": ['RELATES_TO'],
-            "metadata": {"index": ['index1']},
+            "node_props": {"Person": ["name", "age"]},
+            "rel_props": {"KNOWS": ["since"]},
+            "relationships": ["KNOWS"],
+            "metadata": {"index": []},
         }
         self.assertEqual(structured_schema, expected_schema)
 
@@ -465,6 +464,64 @@ def test_add_graph_elements(self):
             'node1', 'node2', 'RELATES_TO'
         )
 
+    def test_validate_time_label_valid(self):
+        valid_time = "2024-12-31T21:45:22"
+        result = self.graph._validate_time_label(valid_time)
+        self.assertEqual(result, valid_time)
+
+    def test_validate_time_label_none(self):
+        with self.assertRaises(ValueError):
+            self.graph._validate_time_label(None)
+
+    def test_add_triplet_with_time_label(self):
+        subj = 'node1'
+        obj = 'node2'
+        rel = 'RELATESTO'
+        time_label = '2024-12-31T21:45:22'
+
+        self.graph.ensure_tag_exists = Mock()
+        self.graph.ensure_edge_type_exists = Mock()
+        self.graph.add_node = Mock()
+        mock_result = Mock()
+        mock_result.is_succeeded.return_value = True
+        self.graph.query = Mock(return_value=mock_result)
+
+        self.graph.add_triplet(subj, obj, rel, time_label)
+
+        self.graph.ensure_tag_exists.assert_has_calls(
+            [call('node1'), call('node2')]
+        )
+        self.graph.ensure_edge_type_exists.assert_called_with(rel, time_label)
+        self.graph.add_node.assert_any_call(node_id=subj, tag_name=subj)
+        self.graph.add_node.assert_any_call(node_id=obj, tag_name=obj)
+
+        expected_stmt = (
+            f'INSERT EDGE IF NOT EXISTS {rel}(time_label) VALUES '
+            f'"{subj}"->"{obj}":("{time_label}")'
+        )
+        self.graph.query.assert_called_with(expected_stmt)
+
+    def test_add_triplet_with_invalid_time_label(self):
+        subj = 'node1'
+        obj = 'node2'
+        rel = 'RELATESTO'
+        invalid_time = '2024/12/31 21:45:22'  # wrong format
+
+        with self.assertRaises(ValueError) as context:
+            self.graph.add_triplet(subj, obj, rel, invalid_time)
+
+        self.assertIn("Invalid time label format", str(context.exception))
+
+    def test_ensure_tag_exists_with_time_label(self):
+        tag_name = 'Tag1'
+        time_label = '2024-12-31T21:45:22'
+
+        mock_result = Mock()
+        mock_result.is_succeeded.return_value = True
+        self.graph.query = Mock(return_value=mock_result)
+
+        self.graph.ensure_tag_exists(tag_name, time_label)
 
-if __name__ == '__main__':
-    unittest.main()
+        expected_stmt = f"""CREATE TAG IF NOT EXISTS {tag_name}
+            (time_label DATETIME DEFAULT {time_label})"""
+        self.graph.query.assert_called_with(expected_stmt)