From b4a8e0963c0309d2a4cdb76a4d7f0fd1359383da Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Thu, 9 Jun 2016 04:08:19 +0300
Subject: track_status.py: ignore connection errors

This closes (hopefully) #1.
---
 api.py          | 34 +++++++++++++++++++++++-----------
 track_status.py |  5 ++++-
 2 files changed, 27 insertions(+), 12 deletions(-)

diff --git a/api.py b/api.py
index 4b337ff..40df08a 100644
--- a/api.py
+++ b/api.py
@@ -7,6 +7,7 @@ from datetime import datetime
 from enum import Enum
 import json
 import sys
+from urllib.error import URLError
 import urllib.request
 
 class Language(Enum):
@@ -74,6 +75,20 @@ class User:
         def __str__(self):
             return self.value
 
+
+class Error(RuntimeError):
+    pass
+
+class InvalidResponseError(Error):
+    def __init__(self, response):
+        self.response = response
+
+    def __str__(self):
+        return str(self.response)
+
+class ConnectionError(Error):
+    pass
+
 class API:
     def __init__(self, lang=Language.DEFAULT):
         self.lang = lang
@@ -95,10 +110,14 @@ class API:
 
     def _call_method(self, method, **kwargs):
         url = self._build_method_url(method, **kwargs)
-        response = json.loads(urllib.request.urlopen(url).read().decode())
-        if 'response' not in response:
-            raise self.Error(response)
-        return response['response']
+        try:
+            with urllib.request.urlopen(url) as request:
+                response = json.loads(request.read().decode())
+                if 'response' not in response:
+                    raise InvalidResponseError(response)
+                return response['response']
+        except URLError:
+            raise ConnectionError()
 
     @staticmethod
     def _format_param_values(xs):
@@ -119,10 +138,3 @@ class API:
             Method.FRIENDS_GET,
             user_id=str(user_id),
             fields=self._format_param_values(fields)))
-
-    class Error(RuntimeError):
-        def __init__(self, impl):
-            self._impl = impl
-
-        def __str__(self):
-            return repr(self._impl)
diff --git a/track_status.py b/track_status.py
index 2761b2b..129b236 100644
--- a/track_status.py
+++ b/track_status.py
@@ -65,7 +65,10 @@ def loop_update_status(api, uids, timeout=DEFAULT_TIMEOUT):
         print_status(users[uid])
     while True:
         time.sleep(timeout)
-        updated_users = update_status(api, uids)
+        try:
+            updated_users = update_status(api, uids)
+        except API.ConnectionError:
+            continue
         for uid in updated_users:
             if users[uid].is_online() != updated_users[uid].is_online():
                 users[uid] = updated_users[uid]
-- 
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