From 3a90ab0dbf5826bc7476971cd163c9a080d2fb2f Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Fri, 8 Mar 2019 22:30:36 +0100
Subject: Digikey: extracting http caching into its own class.

---
 src/ee/_utils.py | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

(limited to 'src/ee/_utils.py')

diff --git a/src/ee/_utils.py b/src/ee/_utils.py
index 29b039a..f917847 100644
--- a/src/ee/_utils.py
+++ b/src/ee/_utils.py
@@ -1,4 +1,5 @@
-from typing import List
+from pathlib import Path
+from typing import List, Optional
 
 
 def ensure_has_columns(df: "pandas.DataFrame", columns: List[str]):
@@ -40,3 +41,38 @@ def all(filters):
         return True
 
     return f
+
+
+class HttpCache(object):
+    def __init__(self, path: Path):
+        self.path = path
+
+    def lookup(self, key):
+        cache_path = self._make_path(key)
+
+        if cache_path.exists():
+            with open(str(cache_path), "r") as f:
+                return f.read()
+
+    def save(self, key, value):
+        cache_path = self._make_path(key)
+        cache_path.parent.mkdir(parents=True, exist_ok=True)
+
+        with cache_path.open("w") as f:
+            f.write(value)
+
+    def _make_path(self, key) -> Path:
+        return self.path / "{}.html".format(key)
+
+
+class EmptyHttpCache(object):
+    @staticmethod
+    def lookup(key):
+        return None
+
+    def save(self, key, value):
+        pass
+
+
+def maybe_cache(path: Optional[Path]) -> HttpCache:
+    return HttpCache(path) if path is not None else EmptyHttpCache()
-- 
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