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# -*- coding: utf-8 -*-
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import hashlib
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import json
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import time
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from typing import Iterator, Dict
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from openai import OpenAI
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from openai.types.chat import ChatCompletionChunk
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from Neo4j.K2_Neo4jExecutor import *
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class KnowledgeGraph:
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def __init__(self, content: str):
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self.content = content
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self.question_id = self._generate_question_id()
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self.graph = self._init_graph_connection()
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self.existing_knowledge = self._fetch_existing_nodes("KnowledgePoint")
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self.existing_ability = self._fetch_existing_nodes("AbilityPoint")
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self.client = OpenAI(api_key=MODEL_API_KEY, base_url=MODEL_API_URL)
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def _validate_ids(self, line: str) -> bool:
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"""强化ID验证（严格过滤非法节点）"""
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# 调整正则表达式严格匹配格式
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found_ids = {
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'kp': set(re.findall(r'\b(kp_[a-f0-9]{6})\b', line.lower())),
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'ab': set(re.findall(r'\b(ab_[a-f0-9]{6})\b', line.lower()))
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}
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# 严格检查存在性（空集合视为有效）
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valid_kp = not found_ids['kp'] or all(kp in self.existing_knowledge for kp in found_ids['kp'])
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valid_ab = not found_ids['ab'] or all(ab in self.existing_ability for ab in found_ids['ab'])
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return valid_kp and valid_ab
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def _init_graph_connection(self) -> Graph:
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"""初始化并测试数据库连接"""
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try:
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graph = Graph(NEO4J_URI, auth=NEO4J_AUTH)
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graph.run("RETURN 1").data()
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print("✅ Neo4j连接成功")
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return graph
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except Exception as e:
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raise ConnectionError(f"❌ 数据库连接失败: {str(e)}")
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def _validate_weight(self, line: str) -> bool:
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"""验证关系权重是否合法"""
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weight_match = re.search(r"weight\s*:\s*([0-9.]+)", line)
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if weight_match:
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try:
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weight = float(weight_match.group(1))
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return 0.0 <= weight <= 1.0
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except ValueError:
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return False
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return True # 没有weight属性时视为合法
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def _validate_cypher_structure(self, cypher: str) -> bool:
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"""验证WITH子句存在性"""
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has_merge = re.search(r'\bMERGE\s*\(q:Question\b', cypher, re.IGNORECASE)
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has_with = re.search(r'\bWITH\s+q\b', cypher, re.IGNORECASE)
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return not has_merge or (has_merge and has_with)
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def _generate_question_id(self) -> str:
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"""生成题目唯一标识符"""
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return hashlib.md5(self.content.encode()).hexdigest()[:8]
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def _fetch_existing_nodes(self, label: str) -> Dict[str, str]:
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"""从Neo4j获取已有节点"""
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try:
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cypher = f"MATCH (n:{label}) RETURN n.id as id, n.name as name"
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result = self.graph.run(cypher).data()
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return {item['id']: item['name'] for item in result}
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except Exception as e:
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print(f"❌ 节点查询失败: {str(e)}")
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return {}
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def _generate_stream(self) -> Iterator[ChatCompletionChunk]:
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"""强化提示词限制"""
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# 生成现有ID列表的提示
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existing_kp_ids = '\n'.join([f"- {k}" for k in list(self.existing_knowledge.keys())[:5]])
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existing_ab_ids = '\n'.join([f"- {k}" for k in list(self.existing_ability.keys())[:5]])
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system_prompt = f'''
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将题目中涉及到的小学数学知识点、能力点进行总结，并且按照以下格式生成在neo4j-community-5.26.2上的语句：
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重要限制条件（违反将导致执行失败）：
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1. 只输出cypher脚本，不要输出其它内容,也不要加代码块的起始终止符
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2. 禁止创建新节点（只能使用以下现有ID）
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3. 现有知识点ID列表：
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{existing_kp_ids}
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...
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4. 现有能力点ID列表：
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{existing_ab_ids}
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...
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5. 必须使用MATCH定位已有节点后才能建立关系
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生成格式示例（注意WITH子句）：
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MERGE (q:Question {{id: "{self.question_id}"}})
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SET q.content = "题目内容",
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q.name = "前10字符"
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WITH q
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MATCH (kp1:KnowledgePoint {{id: "kp_3f5g6h"}})
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WHERE kp1 IS NOT NULL
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MERGE (q)-[:TESTS_KNOWLEDGE]->(kp1)
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'''
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return self.client.chat.completions.create(
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model=MODEL_NAME,
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messages=[
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{"role": "system", "content": system_prompt},
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{"role": "user", "content": self.content}
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],
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stream=True,
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timeout=300
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)
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def _format_node_list(self, nodes: Dict[str, str]) -> str:
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"""格式化节点列表"""
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if not nodes:
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return " （无相关节点）"
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sample = []
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for i, (k, v) in enumerate(nodes.items()):
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if i >= 5:
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sample.append(f" ...（共{len(nodes)}个，仅显示前5个）")
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break
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sample.append(f" - {k}: {v}")
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return '\n'.join(sample)
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def _extract_cypher(self, content: str) -> str:
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"""安全提取Cypher"""
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safe_blocks = []
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for block in re.findall(r"```(?:cypher)?\n(.*?)```", content, re.DOTALL):
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cleaned = self._sanitize_cypher(block)
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if cleaned:
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safe_blocks.append(cleaned)
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return ';\n\n'.join(safe_blocks) if safe_blocks else ""
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def _sanitize_cypher(self, cypher: str) -> str:
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# 新增过滤条件：禁止MERGE非Question节点
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if re.search(r'\bMERGE\s*\((?!q:Question)', cypher, re.IGNORECASE):
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print("⚠️ 检测到非法MERGE语句，已过滤")
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return ""
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# 新增过滤条件：验证所有MATCH的节点是否带ID
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for line in cypher.split('\n'):
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if 'MATCH' in line and not re.search(r'\{id:\s*".+?"\}', line):
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print(f"⚠️ 检测到无ID的MATCH语句: {line[:50]}")
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return ""
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def run(self) -> Tuple[bool, str, str]:
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"""执行安全生成流程（修正返回三元组）"""
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if not self.existing_knowledge or not self.existing_ability:
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print("❌ 知识库或能力点为空，请检查数据库")
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return False, "节点数据为空", "" # 保持三元组格式
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start_time = time.time()
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spinner = ['⠋', '⠙', '⠹', '⠸', '⠼', '⠴', '⠦', '⠧', '⠇', '⠏']
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content_buffer = []
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try:
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print(f"🚀 开始生成（知识点：{len(self.existing_knowledge)}个，能力点：{len(self.existing_ability)}个）")
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stream = self._generate_stream()
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for idx, chunk in enumerate(stream):
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print(f"\r{spinner[idx % 10]} 生成中（{int(time.time() - start_time)}秒）", end="")
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if chunk.choices and chunk.choices[0].delta.content:
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content_chunk = chunk.choices[0].delta.content
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content_buffer.append(content_chunk)
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if len(content_buffer) == 1:
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print("\n\n📝 内容生成开始：")
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print(content_chunk, end="", flush=True)
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if content_buffer:
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full_content = ''.join(content_buffer)
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cypher_script = self._extract_cypher(full_content) # 新增提取步骤
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print(f"\n\n✅ 生成完成！耗时 {int(time.time() - start_time)}秒")
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return True, full_content, cypher_script # 返回三元组
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print("\n⚠️ 生成完成但未获取到有效内容")
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return False, "空内容", "" # 修正为三元组
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except Exception as e:
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error_msg = str(e) if not isinstance(e, dict) else json.dumps(e)
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print(f"\n\n❌ 生成失败：{error_msg}")
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return False, error_msg, "" # 保持三元组格式
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