65 lines
2.3 KiB
Python
65 lines
2.3 KiB
Python
"""
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Service discovery for API Gateway
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"""
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import logging
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import httpx
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from typing import Optional, Dict
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import json
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from app.core.config import settings
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logger = logging.getLogger(__name__)
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class ServiceDiscovery:
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"""Service discovery client"""
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def __init__(self):
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self.consul_url = settings.CONSUL_URL if hasattr(settings, 'CONSUL_URL') else None
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self.service_cache: Dict[str, str] = {}
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async def get_service_url(self, service_name: str) -> Optional[str]:
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"""Get service URL from service discovery"""
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# Return cached URL if available
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if service_name in self.service_cache:
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return self.service_cache[service_name]
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# Try Consul if enabled
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if self.consul_url and getattr(settings, 'ENABLE_SERVICE_DISCOVERY', False):
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try:
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url = await self._get_from_consul(service_name)
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if url:
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self.service_cache[service_name] = url
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return url
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except Exception as e:
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logger.warning(f"Failed to get {service_name} from Consul: {e}")
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# Fall back to environment variables
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return self._get_from_env(service_name)
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async def _get_from_consul(self, service_name: str) -> Optional[str]:
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"""Get service URL from Consul"""
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try:
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async with httpx.AsyncClient(timeout=5.0) as client:
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response = await client.get(
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f"{self.consul_url}/v1/health/service/{service_name}?passing=true"
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)
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if response.status_code == 200:
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services = response.json()
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if services:
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service = services[0]
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address = service['Service']['Address']
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port = service['Service']['Port']
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return f"http://{address}:{port}"
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except Exception as e:
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logger.error(f"Consul query failed: {e}")
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return None
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def _get_from_env(self, service_name: str) -> Optional[str]:
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"""Get service URL from environment variables"""
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env_var = f"{service_name.upper().replace('-', '_')}_SERVICE_URL"
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return getattr(settings, env_var, None) |