服务间集成的契约测试自动化：Pact与AI生成测试桩

class ContractGenerator:
    def generate_from_consumer(self, consumer_code: str) -> Contract:
        """
        从消费者代码生成契约
        """
        # 分析AST提取HTTP调用
        http_calls = extract_http_calls(consumer_code)
        
        contracts = []
        for call in http_calls:
            # 分析请求模式
            request_pattern = self.analyze_request(call.request)
            
            # 分析响应使用模式
            response_usage = self.analyze_response_usage(
                call.response, consumer_code
            )
            
            # 推断字段约束
            constraints = self.infer_constraints(response_usage)
            
            contract = Contract(
                request=request_pattern,
                response_constraints=constraints,
                provider=call.provider,
                consumer=call.consumer
            )
            contracts.append(contract)
        
        return contracts
    
    def infer_constraints(self, usage_patterns: List[Usage]) -> Constraints:
        """
        从使用模式推断字段约束
        """
        constraints = Constraints()
        
        for pattern in usage_patterns:
            # 如果字段被直接比较，推断枚举类型
            if pattern.is_compared_with_constants():
                constraints.add_enum(
                    field=pattern.field,
                    values=pattern.constant_values
                )
            
            # 如果字段参与计算，推断数值类型
            if pattern.used_in_arithmetic():
                constraints.add_type(
                    field=pattern.field,
                    type="number"
                )
            
            # 如果字段被格式化，推断日期类型
            if pattern.formatted_as_date():
                constraints.add_type(
                    field=pattern.field,
                    type="date-time"
                )
        
        return constraints

class AIPactVerifier:
    def verify_with_semantics(self, pact: Pact, provider_impl) -> VerificationResult:
        """
        语义感知的契约验证
        """
        result = VerificationResult()
        
        for interaction in pact.interactions:
            # 1. 结构验证（传统）
            structural_match = self.verify_structure(
                interaction.expected_response,
                actual_response
            )
            
            # 2. 语义验证（AI增强）
            semantic_match = self.verify_semantics(
                interaction.expected_response,
                actual_response,
                interaction.description
            )
            
            if structural_match and not semantic_match:
                # 危险：结构匹配但语义不符
                result.add_warning(
                    interaction=interaction,
                    type="SEMANTIC_MISMATCH",
                    explanation=semantic_match.explanation,
                    suggestion=semantic_match.fix_suggestion
                )
            
            # 3. 业务规则验证
            business_rules = self.extract_business_rules(interaction)
            for rule in business_rules:
                if not self.verify_rule(rule, actual_response):
                    result.add_failure(
                        interaction=interaction,
                        rule=rule,
                        violation=rule.violation_description
                    )
        
        return result

# AI Mock：智能响应
class AIMockProvider:
    def __init__(self, contract: Contract):
        self.contract = contract
        self.llm = LLMClient()
    
    def handle_request(self, request: Request) -> Response:
        # 1. 验证请求合理性
        if not self.is_valid_request(request):
            return self.generate_error_response(request)
        
        # 2. 根据上下文生成合理响应
        context = self.build_context(request)
        
        # 3. AI生成符合契约的响应
        response_data = self.llm.generate(
            prompt=f"""
            根据以下契约生成一个合理的响应：
            
            契约：{self.contract.schema}
            请求：{request}
            上下文：{context}
            
            要求：
            - 符合契约结构
            - 数据合理（符合业务逻辑）
            - 包含边界条件（如空列表、大数值）
            - 返回JSON格式
            """,
            schema=self.contract.response_schema
        )
        
        return Response(data=response_data)
    
    def is_valid_request(self, request: Request) -> bool:
        """验证请求参数是否合理"""
        # 检查必填字段
        # 检查数值范围
        # 检查格式有效性
        # AI辅助：检查业务逻辑合理性
        pass
    
    def build_context(self, request: Request) -> Context:
        """构建生成响应的上下文"""
        return {
            "request_params": request.params,
            "session_history": self.session_history,
            "business_rules": self.contract.business_rules
        }

class StatefulMock:
    """
    维护状态，支持跨调用的场景测试
    """
    def __init__(self):
        self.state = {}
    
    def create_order(self, request):
        order_id = generate_id()
        self.state[order_id] = {
            "status": "CREATED",
            "items": request.items,
            "created_at": now()
        }
        return {"orderId": order_id, "status": "CREATED"}
    
    def pay_order(self, request):
        order = self.state.get(request.order_id)
        
        if not order:
            return error("Order not found")
        
        if order["status"] != "CREATED":
            return error(f"Cannot pay order in {order['status']} state")
        
        order["status"] = "PAID"
        order["paid_at"] = now()
        
        return {"orderId": request.order_id, "status": "PAID"}
    
    def get_order(self, request):
        order = self.state.get(request.order_id)
        
        if not order:
            return error("Order not found")
        
        return order

class ContractChangeNotifier:
    def on_contract_change(self, event: ContractChangeEvent):
        """
        契约变更时的自动通知
        """
        # 1. 分析变更影响
        impact = self.analyze_impact(event)
        
        # 2. 查找受影响的消费者
        affected_consumers = self.find_affected_consumers(event)
        
        # 3. 生成迁移指南
        migration_guide = self.ai.generate_migration_guide(
            old_contract=event.old_version,
            new_contract=event.new_version,
            consumers=affected_consumers
        )
        
        # 4. 通知相关团队
        for consumer in affected_consumers:
            self.notify_team(
                team=consumer.team,
                subject=f"契约变更通知: {event.provider}/{event.contract_name}",
                body={
                    "change_summary": impact.summary,
                    "breaking_changes": impact.breaking_changes,
                    "migration_guide": migration_guide,
                    "deadline": event.compatibility_deadline
                }
            )