feat: Migration knowledge base retrieval node

Author: shaohuzhang1

apps/application/workflow/nodes/search_knowledge_node/__init__.py

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+# coding=utf-8
+"""
+    @project: MaxKB
+    @Author：虎虎虎
+    @file： __init__.py
+    @date：2026/7/2 10:00
+    @desc:
+"""
+from .search_knowledge_node import SearchKnowledgeNode

apps/application/workflow/nodes/search_knowledge_node/search_knowledge_node.py

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+# coding=utf-8
+"""
+    @project: MaxKB
+    @Author：虎虎虎
+    @file： search_knowledge_node.py
+    @date：2026/7/2 10:00
+    @desc:
+"""
+import os
+import re
+from typing import List, Dict
+
+from django.core import validators
+from django.db import connection
+from django.db.models import QuerySet
+from django.utils.translation import gettext_lazy as _
+from rest_framework import serializers
+
+from application.workflow.common import WorkflowType
+from application.workflow.i_node import INode
+from common.config.embedding_config import VectorStore
+from common.constants.permission_constants import RoleConstants
+from common.database_model_manage.database_model_manage import DatabaseModelManage
+from common.db.search import native_search
+from common.utils.common import flat_map, get_file_content
+from common.utils.shared_resource_auth import filter_authorized_ids
+from knowledge.models import Document, Paragraph, Knowledge, SearchMode
+from maxkb.conf import PROJECT_DIR
+from models_provider.tools import get_model_instance_by_model_workspace_id
+
+
+class DatasetSettingSerializer(serializers.Serializer):
+    top_n = serializers.IntegerField(required=True, label=_("Reference segment number"))
+    similarity = serializers.FloatField(required=True, max_value=2, min_value=0, label=_('similarity'))
+    search_mode = serializers.CharField(required=True, validators=[
+        validators.RegexValidator(regex=re.compile("^embedding|keywords|blend$"),
+                                  message=_("The type only supports embedding|keywords|blend"), code=500)
+    ], label=_("Retrieval Mode"))
+    max_paragraph_char_number = serializers.IntegerField(required=True,
+                                                         label=_("Maximum number of words in a quoted segment"))
+
+
+class SearchKnowledgeNodeSerializer(serializers.Serializer):
+    knowledge_id_list = serializers.ListField(required=True, child=serializers.UUIDField(required=True),
+                                              label=_("Dataset id list"))
+    knowledge_setting = DatasetSettingSerializer(required=True)
+    question_reference_address = serializers.ListField(required=True)
+    show_knowledge = serializers.BooleanField(required=True,
+                                              label=_("The results are displayed in the knowledge sources"))
+    search_scope_type = serializers.ChoiceField(
+        required=False, choices=['custom', 'referencing'], label=_("search scope type"),
+        allow_null=True, default='custom'
+    )
+    search_scope_source = serializers.ChoiceField(
+        required=False, choices=['document', 'knowledge'],
+        label=_("search scope variable type"), default='knowledge'
+    )
+    search_scope_reference = serializers.ListField(
+        required=False, label=_("search scope variable"), default=list
+    )
+
+
+def _get_paragraph_list(chat_record, node_id):
+    return flat_map([chat_record.details[key].get('paragraph_list', []) for key in chat_record.details if
+                     (chat_record.details[
+                          key].get('type', '') == 'search-dataset-node') and chat_record.details[key].get(
+                         'paragraph_list', []) is not None and key == node_id])
+
+
+def _get_embedding_id(dataset_id_list):
+    dataset_list = QuerySet(Knowledge).filter(id__in=dataset_id_list)
+    if len(set([dataset.embedding_model_id for dataset in dataset_list])) > 1:
+        raise Exception("关联知识库的向量模型不一致，无法召回分段。")
+    if len(dataset_list) == 0:
+        raise Exception("知识库设置错误,请重新设置知识库")
+    return dataset_list[0].embedding_model_id
+
+
+def _reset_title(title):
+    if title is None or len(title.strip()) == 0:
+        return ""
+    else:
+        return f"#### {title}\n"
+
+
+def _reset_meta(meta):
+    if not meta.get('allow_download', False):
+        return {'allow_download': False}
+    return meta
+
+
+def _reset_paragraph(paragraph: Dict, embedding_list: List):
+    filter_embedding_list = [embedding for embedding in embedding_list if
+                             str(embedding.get('paragraph_id')) == str(paragraph.get('id'))]
+    if filter_embedding_list is not None and len(filter_embedding_list) > 0:
+        find_embedding = filter_embedding_list[-1]
+        return {
+            **paragraph,
+            'similarity': find_embedding.get('similarity'),
+            'is_hit_handling_method': find_embedding.get('similarity') > paragraph.get(
+                'directly_return_similarity') and paragraph.get('hit_handling_method') == 'directly_return',
+            'update_time': paragraph.get('update_time').strftime("%Y-%m-%d %H:%M:%S"),
+            'create_time': paragraph.get('create_time').strftime("%Y-%m-%d %H:%M:%S"),
+            'id': str(paragraph.get('id')),
+            'knowledge_id': str(paragraph.get('knowledge_id')),
+            'document_id': str(paragraph.get('document_id')),
+            'meta': _reset_meta(paragraph.get('meta'))
+        }
+
+
+def _list_paragraph(embedding_list: List, vector):
+    paragraph_id_list = [row.get('paragraph_id') for row in embedding_list]
+    if paragraph_id_list is None or len(paragraph_id_list) == 0:
+        return []
+    paragraph_list = native_search(QuerySet(Paragraph).filter(id__in=paragraph_id_list),
+                                   get_file_content(
+                                       os.path.join(PROJECT_DIR, "apps", "application", 'sql',
+                                                    'list_knowledge_paragraph_by_paragraph_id.sql')),
+                                   with_table_name=True)
+    if len(paragraph_list) != len(paragraph_id_list):
+        exist_paragraph_list = [row.get('id') for row in paragraph_list]
+        for paragraph_id in paragraph_id_list:
+            if paragraph_id not in exist_paragraph_list:
+                vector.delete_by_paragraph_id(paragraph_id)
+    return paragraph_list
+
+
+class SearchKnowledgeNode(INode):
+    serializer_class = SearchKnowledgeNodeSerializer
+    supported_workflow_type_list = [WorkflowType.APPLICATION, WorkflowType.TOOL]
+    type = 'search-knowledge-node'
+
+    def execute(self):
+        node_params = self.get_parameters()
+        workflow_params = self.get_workflow_parameters()
+
+        knowledge_id_list = node_params.get('knowledge_id_list', [])
+        knowledge_setting = node_params.get('knowledge_setting', {})
+        question_reference_address = node_params.get('question_reference_address', [])
+        show_knowledge = node_params.get('show_knowledge', False)
+        search_scope_type = node_params.get('search_scope_type', 'custom')
+        search_scope_source = node_params.get('search_scope_source', 'knowledge')
+        search_scope_reference = node_params.get('search_scope_reference', [])
+
+        question = str(self.workflow_manage.get_reference_field(
+            question_reference_address[0], question_reference_address[1:]))
+
+        exclude_paragraph_id_list = []
+        if workflow_params.get('re_chat', False):
+            history_chat_record = workflow_params.get('history_chat_record', [])
+            paragraph_id_list = [p.get('id') for p in flat_map(
+                [_get_paragraph_list(chat_record, self.get_node_id()) for chat_record in history_chat_record if
+                 chat_record.problem_text == question])]
+            exclude_paragraph_id_list = list(set(paragraph_id_list))
+
+        self.write_context('question', question)
+        self.write_context('show_knowledge', show_knowledge)
+
+        document_id_list = None
+        if search_scope_type == 'referencing':
+            if search_scope_source == 'knowledge':
+                knowledge_id_list = self._get_reference_content(search_scope_reference)
+            else:
+                document_id_list = self._get_reference_content(search_scope_reference)
+                knowledge_id_list = [str(k) for k in QuerySet(Document).filter(
+                    id__in=document_id_list
+                ).values_list('knowledge_id', flat=True).distinct()]
+
+        get_knowledge_list_of_authorized = DatabaseModelManage.get_model('get_knowledge_list_of_authorized')
+        chat_user_type = workflow_params.get('chat_user_type')
+        if get_knowledge_list_of_authorized is not None and RoleConstants.CHAT_USER.value.name == chat_user_type:
+            knowledge_id_list = get_knowledge_list_of_authorized(
+                workflow_params.get('chat_user_id'), knowledge_id_list)
+
+        workspace_id = workflow_params.get('workspace_id')
+        knowledge_id_list = filter_authorized_ids('knowledge', knowledge_id_list, workspace_id)
+
+        if len(knowledge_id_list) == 0:
+            self._write_empty_result(question)
+            return
+
+        model_id = _get_embedding_id(knowledge_id_list)
+        embedding_model = get_model_instance_by_model_workspace_id(model_id, workspace_id)
+        embedding_value = embedding_model.embed_query(question)
+        vector = VectorStore.get_embedding_vector()
+
+        exclude_document_id_list = [str(document.id) for document in
+                                    QuerySet(Document).filter(knowledge_id__in=knowledge_id_list, is_active=False)]
+
+        embedding_list = vector.query(question, embedding_value, knowledge_id_list, document_id_list,
+                                      exclude_document_id_list, exclude_paragraph_id_list, True,
+                                      knowledge_setting.get('top_n'), knowledge_setting.get('similarity'),
+                                      SearchMode(knowledge_setting.get('search_mode')))
+
+        connection.close()
+
+        if embedding_list is None:
+            self._write_empty_result(question)
+            return
+
+        paragraph_list = _list_paragraph(embedding_list, vector)
+        result = [_reset_paragraph(paragraph, embedding_list) for paragraph in paragraph_list]
+        result = sorted(result, key=lambda p: p.get('similarity'), reverse=True)
+
+        self.write_context('paragraph_list', result)
+        self.write_context('is_hit_handling_method_list',
+                           [row for row in result if row.get('is_hit_handling_method')])
+        self.write_context('data', '\n'.join(
+            [f"{_reset_title(paragraph.get('title', ''))}{paragraph.get('content')}" for paragraph in
+             result])[0:knowledge_setting.get('max_paragraph_char_number', 5000)])
+        self.write_context('directly_return', '\n'.join(
+            [paragraph.get('content') for paragraph in result if paragraph.get('is_hit_handling_method')]))
+
+    def _write_empty_result(self, question):
+        self.write_context('paragraph_list', [])
+        self.write_context('is_hit_handling_method_list', [])
+        self.write_context('data', '')
+        self.write_context('directly_return', '')
+        self.write_context('question', question)
+
+    def _get_reference_content(self, fields: List[str]):
+        if fields:
+            return self.workflow_manage.get_reference_field(fields[0], fields[1:])
+        return None