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Make check_exists cache negative results as well as positive ones #580

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Make check_exists cache negative results as well as positive ones #580

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6 changes: 5 additions & 1 deletion schema_salad/fetcher.py
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Original file line number Diff line number Diff line change
Expand Up @@ -105,7 +105,10 @@ def fetch_text(self, url: str, content_types: Optional[List[str]] = None) -> str
raise ValidationException(f"Unsupported scheme in url: {url}")

def check_exists(self, url: str) -> bool:
if url in self.cache:
entry = self.cache.get(url)
if entry is False:
return False
elif entry is not None:
return True

split = urllib.parse.urlsplit(url)
Expand All @@ -118,6 +121,7 @@ def check_exists(self, url: str) -> bool:
resp = self.session.head(url, allow_redirects=True)
resp.raise_for_status()
except Exception:
self.cache[url] = False
return False
self.cache[url] = True
return True
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