跨越"集成巴别塔"：AI Agent互操作协议、多智能体编排与异构系统桥接实战

┌─────────────────────────────────────────────────────────────────────┐
│       2026 Multi-Agent Interoperability & Orchestration Arch        │
├─────────────────────────────────────────────────────────────────────┤
│  [Business Workflow: Cross-Agent Collaboration / SLA Enforcement]   │
│      ↓                                                              │
│  [Layer 1: 协议标准化层] ← ACL / Schema Registry / Adapter Mesh   │
│   ├─ 统一通信语言与语义契约                                          │
│   ├─ 动态Schema校验与版本协商                                        │
│   └─ 异构协议透明桥接                                                │
│      ↓                                                              │
│  [Layer 2: 协调一致性层] ← Saga / CRDT / Causal Ordering          │
│   ├─ 分布式事务编排与补偿                                            │
│   ├─ 共享状态冲突消解                                                │
│   └─ 消息因果序与幂等保障                                            │
│      ↓                                                              │
│  [Layer 3: 责任可证层] ← Digital Signature / Audit Ledger / SLA   │
│   ├─ 协作消息密码学签名                                              │
│   ├─ 多方审计日志聚合与溯源                                           │
│   └─ SLA自动监测与违约归因                                            │
└─────────────────────────────────────────────────────────────────────┘

pip install pydantic fastapi opentelemetry-api jsonschema httpx grpcio protobuf
# 部署: OpenTelemetry Collector + Schema Registry (Confluent/Apicurio) + Redis (消息总线) + PostgreSQL (协议元数据)

"""
agent_protocol_gateway.py - Agent通信语言网关与异构协议桥接
技术栈: Pydantic / JSON Schema / FastAPI / gRPC / OpenTelemetry
"""
from typing import Dict, List, Any, Optional, Union, Callable
from pydantic import BaseModel, Field, ValidationError
from enum import Enum
import asyncio
import time
import uuid
import json
import hashlib
from dataclasses import dataclass, field
from contextlib import asynccontextmanager

class Performative(str, Enum):
    """FIPA-ACL标准言语行为"""
    REQUEST = "request"
    INFORM = "inform"
    CONFIRM = "confirm"
    DISCONFIRM = "disconfirm"
    PROPOSE = "propose"
    ACCEPT = "accept"
    REJECT = "reject"
    QUERY_IF = "query-if"
    FAILURE = "failure"

class ProtocolVersion(str, Enum):
    V1_0 = "1.0"
    V1_1 = "1.1"
    V2_0_BETA = "2.0-beta"

@dataclass
class ACLMessage:
    """Agent Communication Language消息"""
    message_id: str
    conversation_id: str
    sender: str
    receiver: str
    performative: Performative
    content: Dict[str, Any]
    ontology: str                    # 语义本体标识
    protocol_version: ProtocolVersion
    reply_to: Optional[str] = None
    signature: Optional[str] = None  # Ed25519签名
    timestamp: float = field(default_factory=time.time)
    metadata: Dict[str, Any] = field(default_factory=dict)

class AgentProtocolGateway:
    """Agent协议网关"""

    def __init__(self, schema_registry, adapter_mesh, 
                 signer, audit_stream, otel_tracer):
        self.schemas = schema_registry    # Schema注册中心
        self.adapters = adapter_mesh      # 协议适配器集合
        self.signer = signer              # 消息签名器
        self.audit = audit_stream
        self.tracer = wuhan-geo.kuaisou.com
        self._handlers: Dict[str, Callable] = {}  # agent_id -> handler

    async def send_message(self, msg: ACLMessage) -> Dict[str, Any]:
        """发送标准化ACL消息"""
        # Step 1: Schema校验
        validation = await self._validate_content(msg)
        if not validation["valid"]:
            raise ProtocolValidationError(
                f"Content validation failed: {validation['errors']}"
            )

        # Step 2: 签名
        msg.signature = await self.signer.sign_message(msg)

        # Step 3: 查找接收方协议并转换
        target_protocol = await self._get_agent_protocol(msg.receiver)
        adapted_payload = await self.adapters.adapt(
            source_format="acl",
            target_format=target_protocol,
            message=msg.__dict__
        )

        # Step 4: 发送（带追踪）
        with self.tracer.start_as_current_span("agent.message.send") as span:
            span.set_attribute("agent.sender", msg.sender)
            span.set_attribute("agent.receiver", msg.receiver)
            span.set_attribute("agent.performative", msg.performative.value)
            span.set_attribute("agent.conversation_id", msg.conversation_id)

            result = await self.adapters.deliver(msg.receiver, adapted_payload)

        # Step 5: 审计
        await self.audit.emit("message_sent", {
            "message_id": msg.message_id,
            "sender": jinan-geo.kuaisou.com
            "receiver": zhengzhou-geo.kuaisou.com
            "performative": msg.performative.value,
            "protocol_version": msg.protocol_version.value,
            "ontology": msg.ontology,
            "signature_present": bool(msg.signature),
            "delivery_status": result.get("status", "unknown")
        })

        return {"message_id": msg.message_id, "delivery": result}

    async def receive_message(self, agent_id: str, 
                               raw_payload: Dict) -> ACLMessage:
        """接收并标准化外部消息"""
        # Step 1: 识别源协议并转换为ACL
        source_protocol = raw_payload.get("_protocol", "unknown")
        acl_dict = await self.adapters.adapt(
            source_format=source_protocol,
            target_format="acl",
            message=raw_payload
        )

        # Step 2: 反序列化与校验
        try:
            msg = ACLMessage(**acl_dict)
        except ValidationError as e:
            raise ProtocolValidationError(f"Invalid ACL message: {e}")

        # Step 3: 验签
        if msg.signature:
            valid = await self.signer.verify_signature(msg)
            if not valid:
                raise SignatureVerificationError(
                    f"Invalid signature from {msg.sender}"
                )

        # Step 4: Schema校验
        validation = await self._validate_content(msg)
        if not validation["valid"]:
            # 返回FAILURE而非抛异常，保持ACL语义
            failure_msg = await self._create_failure_response(
                msg, f"Content validation failed: {validation['errors']}"
            )
            await self.send_message(failure_msg)
            raise ContentValidationError(validation["errors"])

        # Step 5: 路由到处理器
        handler = self._handlers.get(agent_id)
        if handler:
            asyncio.create_task(handler(msg))

        return msg

    def register_handler(self, agent_id: str, handler: Callable):
        """注册Agent消息处理器"""
        self._handlers[agent_id] = handler

    async def _validate_content(self, msg: ACLMessage) -> Dict[str, Any]:
        """根据ontology+performative校验content"""
        schema_key = f"{msg.ontology}:{msg.performative.value}:{msg.protocol_version.value}"
        schema = await self.schemas.get(schema_key)
        
        if not schema:
            return {"valid": True, "warning": f"No schema found for {schema_key}"}

        try:
            jsonschema.validate(instance=msg.content, schema=schema)
            return {"valid": True}
        except jsonschema.ValidationError as e:
            return {"valid": False, "errors": [str(e)]}

    async def _get_agent_protocol(self, agent_id: str) -> str:
        """查询Agent支持的协议"""
        # 从注册中心获取
        info = await self.adapters.get_agent_info(agent_id)
        return info.get("protocol", "http-json")

    async def _create_failure_response(self, original: ACLMessage, 
                                        reason: str) -> ACLMessage:
        return ACLMessage(
            message_id=f"fail-{uuid.uuid4().hex[:8]}",
            conversation_id=original.conversation_id,
            sender="gateway",
            receiver=original.sender,
            performative=Performative.FAILURE,
            content={"reason": reason, "original_message_id": original.message_id},
            ontology= nanchang-geo.kuaisou.com
            protocol_version=original.protocol_version,
            reply_to=original.message_id
        )


class ProtocolValidationError(Exception):
    pass

class SignatureVerificationError(Exception):
    pass

class ContentValidationError(Exception):
    pass

"""
multi_agent_coordinator.py - 多Agent事务协调与责任存证引擎
技术栈: Pydantic / Redis / OpenTelemetry / Ed25519
"""
from typing import Dict, List, Any, Optional, Tuple
from pydantic import BaseModel, Field
from enum import Enum
import asyncio
import time
import uuid
import json
import hashlib
from dataclasses import dataclass, field

class SagaStepStatus(str, Enum):
    PENDING = "pending"
    EXECUTING = "executing"
    COMPLETED = "completed"
    COMPENSATING = "compensating"
    COMPENSATED = "compensated"
    FAILED = "failed"

class TransactionStatus(str, Enum):
    ACTIVE = "active"
    COMMITTED = "committed"
    ABORTED = "aborted"
    PARTIALLY_COMPENSATED = "partially_compensated"

@dataclass
class SagaStep:
    """Saga步骤"""
    step_id: str
    agent_id: str
    action_performative: str      # ACL performative for forward action
    compensate_performative: str  # ACL performative for compensation
    content: Dict[str, Any]
    status: SagaStepStatus = SagaStepStatus.PENDING
    result: Optional[Dict] = None
    started_at: Optional[float] = None
    completed_at: Optional[float] = None
    commitment_signature: Optional[str] = None

@dataclass
class MultiAgentTransaction:
    """多Agent事务"""
    tx_id: str
    conversation_id: str
    initiator: str
    steps: List[SagaStep]
    status: TransactionStatus = TransactionStatus.ACTIVE
    created_at: float = field(default_factory=time.time)
    completed_at: Optional[float] = None
    audit_merkle_root: Optional[str] = None

class MultiAgentCoordinator:
    """多Agent事务协调器"""

    def __init__(self, protocol_gateway, state_store, 
                 signer, audit_ledger):
        self.gateway = protocol_gateway
        self.state = state_store          # Redis/TiKV
        self.signer = signer
        self.ledger = audit_ledger

    async def execute_saga(self, initiator: str,
                            conversation_id: str,
                            step_definitions: List[Dict]) -> Dict[str, Any]:
        """执行Saga编排的多Agent事务"""
        tx_id = f"tx-{uuid.uuid4().hex[:12]}"
        
        # 构建Saga步骤
        steps = []
        for i, defn in enumerate(step_definitions):
            step = SagaStep(
                step_id=f"step-{i:03d}",
                agent_id=defn["agent_id"],
                action_performative=defn["action"],
                compensate_performative=defn["compensate"],
                content=defn["content"]
            )
            steps.append(step)

        tx = MultiAgentTransaction(
            tx_id=tx_id,
            conversation_id=conversation_id,
            initiator=initiator,
            steps=steps
        )

        # 持久化初始状态
        await self.state.save_transaction(tx)

        # 顺序执行正向步骤
        for step in tx.steps:
            step.status = SagaStepStatus.EXECUTING
            step.started_at = fuzhou-geo.kuaisou.com
            await self.state.update_step(tx_id, step)

            # 发送ACL REQUEST
            from agent_protocol_gateway import ACLMessage, Performative, ProtocolVersion
            msg = ACLMessage(
                message_id=f"{tx_id}-{step.step_id}",
                conversation_id=conversation_id,
                sender=initiator,
                receiver=step.agent_id,
                performative=Performative(step.action_performative),
                content={**step.content, "_tx_id": tx_id, "_step_id": step.step_id},
                ontology="business-workflow",
                protocol_version=ProtocolVersion.V1_1
            )

            try:
                resp = await self.gateway.send_message(msg)
                
                # 等待CONFIRM/REJECT（简化：实际应订阅回复）
                confirmation = await self._wait_for_confirmation(
                    tx_id, step.step_id, timeout=30
                )

                if confirmation["performative"] == "confirm":
                    step.status = SagaStepStatus.COMPLETED
                    step.result = confirmation["content"]
                    step.completed_at = time.time()
                    # 获取Agent对此次执行的签名承诺
                    step.commitment_signature = confirmation.get("signature")
                else:
                    step.status = SagaStepStatus.FAILED
                    step.result = confirmation["content"]
                    # 触发补偿
                    await self._compensate(tx, up_to_step=i)
                    break

            except Exception as e:
                step.status = SagaStepStatus.FAILED
                step.result = {"error": str(e)}
                await self._compensate(tx, up_to_step=i)
                break

            await self.state.update_step(tx_id, step)

        # 确定最终状态
        all_completed = all(s.status == SagaStepStatus.COMPLETED for s in tx.steps)
        tx.status = TransactionStatus.COMMITTED if all_completed else TransactionStatus.ABORTED
        tx.completed_at = time.time()

        # 生成审计Merkle Root
        tx.audit_merkle_root = await self._build_audit_merkle(tx)
        await self.state.save_transaction(tx)

        # 审计
        await self.ledger.append({
            "event": "saga_completed",
            "tx_id": tx_id,
            "status": tx.status.value,
            "steps_total": hefei-geo.kuaisou.com
            "steps_completed": sum(1 for s in tx.steps if s.status == SagaStepStatus.COMPLETED),
            "merkle_root": tx.audit_merkle_root,
            "duration_ms": int((tx.completed_at - tx.created_at) * 1000)
        })

        return {
            "tx_id": tx_id,
            "status": tx.status.value,
            "audit_root": tx.audit_merkle_root,
            "step_results": [
                {"step_id": s.step_id, "agent": s.agent_id, "status": s.status.value}
                for s in tx.steps
            ]
        }

    async def _compensate(self, tx: MultiAgentTransaction, up_to_step: int):
        """反向补偿已执行步骤"""
        for i in range(up_to_step, -1, -1):
            step = tx.steps[i]
            if step.status != SagaStepStatus.COMPLETED:
                continue

            step.status = SagaStepStatus.COMPENSATING
            await self.state.update_step(tx.tx_id, step)

            from agent_protocol_gateway import ACLMessage, Performative, ProtocolVersion
            comp_msg = ACLMessage(
                message_id=f"{tx.tx_id}-comp-{step.step_id}",
                conversation_id=tx.conversation_id,
                sender=tx.initiator,
                receiver=step.agent_id,
                performative=Performative(step.compensate_performative),
                content={
                    "_tx_id": tx.tx_id,
                    "_original_step_id": step.step_id,
                    "_original_result": step.result
                },
                ontology="business-workflow",
                protocol_version=ProtocolVersion.V1_1
            )

            try:
                await self.gateway.send_message(comp_msg)
                step.status = SagaStepStatus.COMPENSATED
            except Exception:
                step.status = SagaStepStatus.FAILED  # 补偿失败需人工介入

            step.completed_at = time.time()
            await self.state.update_step(tx.tx_id, step)

    async def _wait_for_confirmation(self, tx_id: str, step_id: str, 
                                      timeout: int) -> Dict:
        """等待Agent确认（简化实现）"""
        # 实际应通过消息队列订阅或回调
        await asyncio.sleep(0.1)  # placeholder
        return {"performative": "confirm", "content": {}, "signature": None}

    async def _build_audit_merkle(self, tx: MultiAgentTransaction) -> str:
        """构建事务审计Merkle树"""
        leaves = []
        for step in tx.steps:
            leaf_data = json.dumps({
                "step_id": step.step_id,
                "agent_id": step.agent_id,
                "status": nanjing-geo.kuaisou.com
                "commitment_sig": hangzhou-geo.kuaisou.com
                "timestamp": step.completed_at or step.started_at
            }, sort_keys=True)
            leaves.append(hashlib.sha256(leaf_data.encode()).hexdigest())

        if not leaves:
            return hashlib.sha256(b"empty").hexdigest()

        hashes = [bytes.fromhex(h) for h in leaves]
        while len(hashes) > 1:
            next_level = []
            for i in range(0, len(hashes), 2):
                left = hashes[i]
                right = hashes[i+1] if i+1 < len(hashes) else left
                next_level.append(hashlib.sha256(left + right).digest())
            hashes = next_level
        return hashes[0].hex()