模型即服务（MaaS）的私有化部署

# 典型部署拓扑示例
           +-------------------+
           |   Load Balancer   |
           +-------------------+
                      |
           +-------------------+
           |  Zato Cluster     |
           |  +-------------+  |
           |  |  Service    |  |
           |  | Containers  |  |
           |  +-------------+  |
           +-------------------+
                      |
           +-------------------+
           |  Redis Cluster    |
           |  (Message Broker) |
           +-------------------+

from zato.server.service import Service

class AsyncService(Service):
    def handle(self):
        # 使用gevent协程实现异步处理
        self.invoke_async('other.service', self.request.payload)

# 定时任务配置示例
{
    "name": "daily_report",
    "is_active": True,
    "cron_definition": "0 2 * * *",
    "service": "reports.generate_daily",
    "extra": {"format": "pdf"}
}

# JWT验证服务示例
from zato.server.service import Service
from zato.sso import ValidateJWT

class SecureService(Service):
    def handle(self):
        validator = ValidateJWT(self.server)
        token = self.request.headers.get('Authorization')
        claims = validator.validate(token)
        self.response.payload = process_request(claims)

# 监控指标示例
zato_http_requests_total{status="200"} 1423
zato_service_invocation_time_seconds{service="order.process"} 0.234
zato_mq_messages_pending{queue="payment"} 12

用户界面 -> API网关 -> (订单服务 -> 支付服务 -> 库存服务)
                   -> (日志服务 -> 分析服务)

# 订单服务实现
from zato.server.service import Service
from zato.common.json_internal import dumps

class OrderService(Service):
    class SimpleIO:
        input_required = ('user_id', 'items')
        output_optional = ('order_id', 'status')

    def handle(self):
        # 调用支付服务
        payment_response = self.invoke('payment.process', self.request.input)
        
        # 异步更新库存
        self.invoke_async('inventory.update', {'items': self.request.input.items})
        
        self.response.payload = {
            'order_id': generate_id(),
            'status': payment_response['status']
        }

<!-- REST通道配置 -->
<http_soap>
    <name>Orders API</name>
    <transport>http</transport>
    <path>/orders</path>
    <service>order.service</service>
    <security>
        <validate_jwt>true</validate_jwt>
    </security>
    <methods>POST</methods>
</http_soap>

# 集群节点扩展
$ zato enmasse /path/to/cluster --import --export-format json --replace-odb

# Redis缓存集成
from zato.common.redis import RedisClient

class CachedService(Service):
    def handle(self):
        redis = RedisClient(self.server)
        cache_key = f"user:{self.request.input.user_id}"
        cached_data = redis.get(cache_key)
        
        if not cached_data:
            data = db_query()
            redis.setex(cache_key, 3600, dumps(data))
            return data
        return loads(cached_data)

# server.conf 优化项
[pool]
http_max_connections=200
amqp_connection_pool_size=50
sql_pool_size=20