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+import json
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+import uuid
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+from contextlib import contextmanager
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+from typing import Any
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+
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+import psycopg2.extras # type: ignore
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+import psycopg2.pool # type: ignore
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+from pydantic import BaseModel, model_validator
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+
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+from configs import dify_config
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+from core.rag.datasource.vdb.vector_base import BaseVector
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+from core.rag.datasource.vdb.vector_factory import AbstractVectorFactory
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+from core.rag.datasource.vdb.vector_type import VectorType
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+from core.rag.embedding.embedding_base import Embeddings
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+from core.rag.models.document import Document
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+from extensions.ext_redis import redis_client
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+from models.dataset import Dataset
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+
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+
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+class OpenGaussConfig(BaseModel):
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+ host: str
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+ port: int
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+ user: str
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+ password: str
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+ database: str
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+ min_connection: int
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+ max_connection: int
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+
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+ @model_validator(mode="before")
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+ @classmethod
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+ def validate_config(cls, values: dict) -> dict:
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+ if not values["host"]:
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+ raise ValueError("config OPENGAUSS_HOST is required")
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+ if not values["port"]:
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+ raise ValueError("config OPENGAUSS_PORT is required")
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+ if not values["user"]:
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+ raise ValueError("config OPENGAUSS_USER is required")
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+ if not values["password"]:
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+ raise ValueError("config OPENGAUSS_PASSWORD is required")
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+ if not values["database"]:
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+ raise ValueError("config OPENGAUSS_DATABASE is required")
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+ if not values["min_connection"]:
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+ raise ValueError("config OPENGAUSS_MIN_CONNECTION is required")
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+ if not values["max_connection"]:
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+ raise ValueError("config OPENGAUSS_MAX_CONNECTION is required")
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+ if values["min_connection"] > values["max_connection"]:
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+ raise ValueError("config OPENGAUSS_MIN_CONNECTION should less than OPENGAUSS_MAX_CONNECTION")
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+ return values
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+
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+
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+SQL_CREATE_TABLE = """
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+CREATE TABLE IF NOT EXISTS {table_name} (
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+ id UUID PRIMARY KEY,
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+ text TEXT NOT NULL,
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+ meta JSONB NOT NULL,
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+ embedding vector({dimension}) NOT NULL
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+);
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+"""
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+
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+SQL_CREATE_INDEX = """
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+CREATE INDEX IF NOT EXISTS embedding_cosine_{table_name}_idx ON {table_name}
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+USING hnsw (embedding vector_cosine_ops) WITH (m = 16, ef_construction = 64);
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+"""
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+
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+
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+class OpenGauss(BaseVector):
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+ def __init__(self, collection_name: str, config: OpenGaussConfig):
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+ super().__init__(collection_name)
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+ self.pool = self._create_connection_pool(config)
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+ self.table_name = f"embedding_{collection_name}"
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+
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+ def get_type(self) -> str:
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+ return VectorType.OPENGAUSS
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+
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+ def _create_connection_pool(self, config: OpenGaussConfig):
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+ return psycopg2.pool.SimpleConnectionPool(
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+ config.min_connection,
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+ config.max_connection,
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+ host=config.host,
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+ port=config.port,
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+ user=config.user,
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+ password=config.password,
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+ database=config.database,
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+ )
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+
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+ @contextmanager
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+ def _get_cursor(self):
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+ conn = self.pool.getconn()
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+ cur = conn.cursor()
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+ try:
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+ yield cur
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+ finally:
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+ cur.close()
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+ conn.commit()
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+ self.pool.putconn(conn)
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+
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+ def create(self, texts: list[Document], embeddings: list[list[float]], **kwargs):
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+ dimension = len(embeddings[0])
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+ self._create_collection(dimension)
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+ return self.add_texts(texts, embeddings)
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+
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+ def add_texts(self, documents: list[Document], embeddings: list[list[float]], **kwargs):
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+ values = []
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+ pks = []
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+ for i, doc in enumerate(documents):
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+ if doc.metadata is not None:
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+ doc_id = doc.metadata.get("doc_id", str(uuid.uuid4()))
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+ pks.append(doc_id)
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+ values.append(
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+ (
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+ doc_id,
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+ doc.page_content,
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+ json.dumps(doc.metadata),
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+ embeddings[i],
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+ )
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+ )
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+ with self._get_cursor() as cur:
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+ psycopg2.extras.execute_values(
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+ cur, f"INSERT INTO {self.table_name} (id, text, meta, embedding) VALUES %s", values
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+ )
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+ return pks
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+
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+ def text_exists(self, id: str) -> bool:
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+ with self._get_cursor() as cur:
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+ cur.execute(f"SELECT id FROM {self.table_name} WHERE id = %s", (id,))
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+ return cur.fetchone() is not None
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+
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+ def get_by_ids(self, ids: list[str]) -> list[Document]:
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+ with self._get_cursor() as cur:
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+ cur.execute(f"SELECT meta, text FROM {self.table_name} WHERE id IN %s", (tuple(ids),))
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+ docs = []
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+ for record in cur:
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+ docs.append(Document(page_content=record[1], metadata=record[0]))
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+ return docs
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+
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+ def delete_by_ids(self, ids: list[str]) -> None:
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+ # Avoiding crashes caused by performing delete operations on empty lists in certain scenarios
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+ # Scenario 1: extract a document fails, resulting in a table not being created.
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+ # Then clicking the retry button triggers a delete operation on an empty list.
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+ if not ids:
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+ return
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+ with self._get_cursor() as cur:
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+ cur.execute(f"DELETE FROM {self.table_name} WHERE id IN %s", (tuple(ids),))
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+
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+ def delete_by_metadata_field(self, key: str, value: str) -> None:
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+ with self._get_cursor() as cur:
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+ cur.execute(f"DELETE FROM {self.table_name} WHERE meta->>%s = %s", (key, value))
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+
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+ def search_by_vector(self, query_vector: list[float], **kwargs: Any) -> list[Document]:
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+ """
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+ Search the nearest neighbors to a vector.
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+
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+ :param query_vector: The input vector to search for similar items.
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+ :param top_k: The number of nearest neighbors to return, default is 5.
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+ :return: List of Documents that are nearest to the query vector.
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+ """
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+ top_k = kwargs.get("top_k", 4)
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+
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+ with self._get_cursor() as cur:
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+ cur.execute(
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+ f"SELECT meta, text, embedding <=> %s AS distance FROM {self.table_name}"
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+ f" ORDER BY distance LIMIT {top_k}",
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+ (json.dumps(query_vector),),
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+ )
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+ docs = []
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+ score_threshold = float(kwargs.get("score_threshold") or 0.0)
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+ for record in cur:
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+ metadata, text, distance = record
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+ score = 1 - distance
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+ metadata["score"] = score
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+ if score > score_threshold:
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+ docs.append(Document(page_content=text, metadata=metadata))
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+ return docs
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+
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+ def search_by_full_text(self, query: str, **kwargs: Any) -> list[Document]:
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+ top_k = kwargs.get("top_k", 5)
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+
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+ with self._get_cursor() as cur:
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+ cur.execute(
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+ f"""SELECT meta, text, ts_rank(to_tsvector(coalesce(text, '')), plainto_tsquery(%s)) AS score
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+ FROM {self.table_name}
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+ WHERE to_tsvector(text) @@ plainto_tsquery(%s)
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+ ORDER BY score DESC
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+ LIMIT {top_k}""",
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+ # f"'{query}'" is required in order to account for whitespace in query
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+ (f"'{query}'", f"'{query}'"),
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+ )
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+
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+ docs = []
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+
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+ for record in cur:
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+ metadata, text, score = record
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+ metadata["score"] = score
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+ docs.append(Document(page_content=text, metadata=metadata))
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+
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+ return docs
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+
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+ def delete(self) -> None:
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+ with self._get_cursor() as cur:
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+ cur.execute(f"DROP TABLE IF EXISTS {self.table_name}")
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+
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+ def _create_collection(self, dimension: int):
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+ cache_key = f"vector_indexing_{self._collection_name}"
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+ lock_name = f"{cache_key}_lock"
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+ with redis_client.lock(lock_name, timeout=20):
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+ collection_exist_cache_key = f"vector_indexing_{self._collection_name}"
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+ if redis_client.get(collection_exist_cache_key):
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+ return
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+
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+ with self._get_cursor() as cur:
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+ cur.execute(SQL_CREATE_TABLE.format(table_name=self.table_name, dimension=dimension))
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+ if dimension <= 2000:
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+ cur.execute(SQL_CREATE_INDEX.format(table_name=self.table_name))
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+ redis_client.set(collection_exist_cache_key, 1, ex=3600)
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+
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+
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+class OpenGaussFactory(AbstractVectorFactory):
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+ def init_vector(self, dataset: Dataset, attributes: list, embeddings: Embeddings) -> OpenGauss:
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+ if dataset.index_struct_dict:
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+ class_prefix: str = dataset.index_struct_dict["vector_store"]["class_prefix"]
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+ collection_name = class_prefix
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+ else:
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+ dataset_id = dataset.id
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+ collection_name = Dataset.gen_collection_name_by_id(dataset_id)
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+ dataset.index_struct = json.dumps(self.gen_index_struct_dict(VectorType.OPENGAUSS, collection_name))
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+
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+ return OpenGauss(
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+ collection_name=collection_name,
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+ config=OpenGaussConfig(
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+ host=dify_config.OPENGAUSS_HOST or "localhost",
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+ port=dify_config.OPENGAUSS_PORT,
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+ user=dify_config.OPENGAUSS_USER or "postgres",
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+ password=dify_config.OPENGAUSS_PASSWORD or "",
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+ database=dify_config.OPENGAUSS_DATABASE or "dify",
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+ min_connection=dify_config.OPENGAUSS_MIN_CONNECTION,
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+ max_connection=dify_config.OPENGAUSS_MAX_CONNECTION,
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+ ),
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+ )
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LittleFish-15