1 files changed, 33 insertions, 0 deletions
diff --git a/htmlcache.py b/htmlcache.py
new file mode 100644
index 0000000..2f727a7
--- /dev/null
+++ b/htmlcache.py
@@ -0,0 +1,33 @@
+import os
+
+import aiohttp
+
+import main
+
+
+class TexSourceGenerationError(Exception):
+    pass
+
+
+class HtmlCache:
+
+    def __init__(self, cache_path: str):
+        self._cache_path = os.path.abspath(cache_path)
+
+    async def get_utaten_tex_source(self, item_id: str) -> str:
+        cache_file_path = os.path.join(self._cache_path, f'{item_id}.html')
+        if os.path.isfile(cache_file_path):
+            with open(cache_file_path, 'r', encoding='utf-8') as f:
+                html = f.read()
+        else:
+            async with aiohttp.ClientSession() as ses:
+                async with ses.get(f'https://utaten.com/lyric/{item_id}/') as r:
+                    if not r.ok:
+                        raise TexSourceGenerationError('HTTP request failed when reading page source')
+                    html = await r.text()
+                    try:
+                        with open(cache_file_path, 'w', encoding='utf-8') as f:
+                            f.write(html)
+                    except IOError as e:
+                        print(f'Failed to update cache for song `{item_id}`: {e}')
+        return main.html_to_tex(html)