1 files changed, 37 insertions, 30 deletions
diff --git a/management/parsers/ups2018.py b/management/parsers/ups2018.py
index 522a26a..f1da5bf 100644
--- a/management/parsers/ups2018.py
+++ b/management/parsers/ups2018.py
@@ -28,20 +28,22 @@ import requests
 
 from ...models import Course, Group, Room
 from ...utils import get_current_week, get_week
-from .abstractparser import AbstractParser
+from .abstractparser import AbstractParser, ParserError
 
 VARNAME = "v.events.list = "
 
 
 def find_events_list(soup):
     res = []
+    found = False
     for script in soup.xpath("//script/text()"):
         if VARNAME in script:
             for var in script.split('\n'):
                 if var.startswith(VARNAME):
                     res = json.loads(var[len(VARNAME):-2])
+                    found = True
 
-    return res
+    return res, found
 
 
 def get_next_month(dt):
@@ -52,21 +54,40 @@ def get_next_month(dt):
 class Parser(AbstractParser):
     def __init__(self, source):
         super(Parser, self).__init__(source)
+        self.events = [self._make_request(source.url)]
+        self.source = source
+
+    def _make_request(self, url, date=None):
+        events, found = [], False
+        attempts = 0
+        params = {}
+
+        if date is not None:
+            params["Date"] = date
+
+        while not found:
+            if attempts == 3:
+                raise ParserError("Failed to retrieve {0}".format(url))
+            attempts += 1
+
+            # En-tête tiré de mon Firefox…
+            req = super(Parser, self)._make_request(
+                url, params=params,
+                headers={"Accept-Language": "en-US,en;q=0.5"},
+            )
+            req.raise_for_status()
 
-        # En-tête tiré de mon Firefox…
-        base_req = self._make_request(
-            source.url, headers={"Accept-Language": "en-US,en;q=0.5"}
-        )
+            parser = lxml.html.HTMLParser(encoding="utf8")
+            soup = lxml.html.document_fromstring(req.content, parser=parser)
+            events, found = find_events_list(soup)
 
-        parser = lxml.html.HTMLParser(encoding="utf-8")
-        self.soup = lxml.html.document_fromstring(
-            base_req.content, parser=parser
-        )
+        if date is None:
+            self.months = []
+            for option in soup.xpath("//option"):
+                if option.get("selected") is not None or len(self.months) > 0:
+                    self.months.append(option.text)
 
-        self.months = []
-        for option in self.soup.xpath("//option"):
-            if option.get("selected") is not None or len(self.months) > 0:
-                self.months.append(option.text)
+        return events
 
     def __get_event(self, event, today,
                     beginning_of_month, end_of_month,
@@ -179,19 +200,7 @@ class Parser(AbstractParser):
         )
         month_str = month.replace(day=first_monday).strftime("%Y%m%d")
 
-        req = self._make_request(
-            self.source.url,
-            headers={
-                "Accept-Language": "en-US,en;q=0.5",
-            },
-            params={"Date": month_str},
-        )
-        req.raise_for_status()
-
-        parser = lxml.html.HTMLParser(encoding="utf8")
-        soup = lxml.html.document_fromstring(req.content, parser=parser)
-
-        return find_events_list(soup)
+        return self._make_request(self.source.url, month_str)
 
     @asyncio.coroutine
     def get_months_async(self):
@@ -217,7 +226,5 @@ class Parser(AbstractParser):
         return events
 
     def get_source(self):
-        self.events = [
-            find_events_list(self.soup)
-        ] + self.get_source_from_months()
+        self.events += self.get_source_from_months()
         return self.events