cache can_connect for 3 seconds

oml/localnodes.py

@@ -7,18 +7,20 @@ import netifaces
 from zeroconf import (
     ServiceBrowser, ServiceInfo, ServiceStateChange
 )
-from  zeroconf.asyncio import AsyncZeroconf
+from zeroconf.asyncio import AsyncZeroconf
 from tornado.ioloop import PeriodicCallback
 
 import settings
 import state
 from tor_request import get_opener
+from utils import time_cache
 
 import logging
 logger = logging.getLogger(__name__)
 
 
-def can_connect(data):
+@time_cache(3)
+def can_connect(**data):
     try:
         opener = get_opener(data['id'])
         headers = {
@@ -171,6 +173,6 @@ class LocalNodes(dict):
 
     def get_data(self, user_id):
         data = self.get(user_id)
-        if data and can_connect(data):
+        if data and can_connect(**data):
             return data
         return None

oml/utils.py

@@ -5,6 +5,7 @@ from datetime import datetime
 from io import StringIO, BytesIO
 from PIL import Image, ImageFile
 import base64
+import functools
 import hashlib
 import json
 import os
@@ -581,3 +582,17 @@ def iexists(path):
 
 def same_path(f1, f2):
     return unicodedata.normalize('NFC', f1) == unicodedata.normalize('NFC', f2)
+
+def time_cache(max_age, maxsize=128, typed=False):
+    def _decorator(fn):
+        @functools.lru_cache(maxsize=maxsize, typed=typed)
+        def _new(*args, __time_salt, **kwargs):
+            return fn(*args, **kwargs)
+
+        @functools.wraps(fn)
+        def _wrapped(*args, **kwargs):
+            return _new(*args, **kwargs, __time_salt=int(time.time() / max_age))
+
+        return _wrapped
+
+    return _decorator