Add thumbnail downloading

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

chanbans/__main__.py

@@ -14,6 +14,8 @@ from bs4 import BeautifulSoup as Soup
 BANS_URL = "https://4chan.org/bans"
 PREVIEW_RE = re.compile(r"var postPreviews = (.+)")
 DB_PATH = "bans.db"
+THUMBS_DIR = Path("thumbs")
+CACHE_DIR = Path("bans")
 
 
 def get_db():
@@ -38,14 +40,14 @@ def file_cache(
 
     def decorator(func):
         @functools.wraps(func)
-        def wrapper(*args, **kwargs):
+        async def wrapper(*args, **kwargs):
             d = Path(directory)
             d.mkdir(parents=True, exist_ok=True)
             path = Path(directory, time.strftime(format) + suffix)
             if path.exists():
                 return path.read_text()
             else:
-                text = func(*args, **kwargs)
+                text = await func(*args, **kwargs)
                 if deduplicate:
                     # find the most recent file in the path
                     newest_path = newest_in_dir(directory)
@@ -64,13 +66,30 @@ def file_cache(
     return decorator
 
 
-@file_cache(directory="bans", suffix=".html")
-def get_bans_html() -> str:
-    r = httpx.get(BANS_URL)
+@file_cache(directory=CACHE_DIR, suffix=".html")
+async def get_bans_html() -> str:
+    async with httpx.AsyncClient() as c:
+        r = await c.get(BANS_URL)
     return r.text
 
 
-def main():
+async def get_thumb(thumb_path: Union[str, Path], post: dict) -> Optional[bytes]:
+    if "thumb" in post:
+        if thumb_path.exists():
+            return thumb_path.read_bytes()
+        else:
+            url = f"https://i.4cdn.org/bans/thumb/{post['board']}/{post['thumb']}s.jpg"
+            print("Downloading", url)
+            async with httpx.AsyncClient() as c:
+                r = await c.get(url)
+            THUMBS_DIR.mkdir(parents=True, exist_ok=True)
+            thumb_path.write_bytes(r.content)
+            return r.content
+    else:
+        return None
+
+
+async def main():
     # Ensure DB tables
     db = get_db()
     db.executescript(
@@ -81,13 +100,14 @@ def main():
             board varchar(10),
             length varchar(10),
             post text unique,
+            thumb_path text,
             reason varchar(200)
         );
         """
     )
 
     # Get HTML
-    html = get_bans_html()
+    html = await get_bans_html()
     # Get post JSON
     m = PREVIEW_RE.search(html)
     posts = json.loads(m[1][:-1])
@@ -100,6 +120,7 @@ def main():
 
     cur = db.cursor()
 
+    download_jobs = []
     for i, row in enumerate(rows):
         # Labels
         # ['board', 'action', 'length', 'post', 'reason', 'time']
@@ -108,16 +129,31 @@ def main():
             for key, value in zip(labels, [c for c in row if c != "\n"])
             if key != "time"
         }
-        cols["post"] = posts[cols["post"]["data-pid"]]
+        post = posts[cols["post"]["data-pid"]]
+        cols["post"] = post
+
+        if 'thumb' in post:
+            thumb_path = Path(THUMBS_DIR, f"{post['thumb']}s.jpg")
+            download_jobs += [get_thumb(thumb_path, post)]
+
         # Try to create post in database
         try:
             with db:
                 curs = db.execute(
-                    "insert into bans (action, board, length, post, reason) values(?, ?, ?, ?, ?)",
-                    (cols['action'], cols['board'], cols['length'], json.dumps(cols['post']), cols['reason']),
+                    "insert into bans (action, board, length, post, thumb_path, reason) values(?, ?, ?, ?, ?)",
+                    (
+                        cols["action"],
+                        cols["board"],
+                        cols["length"],
+                        json.dumps(cols["post"]),
+                        cols["thumb_path"],
+                        cols["reason"],
+                    ),
                 )
         except:
             pass
+    # Finish off thumbnail jobs
+    await asyncio.gather(*download_jobs)
 
 
-main()
+asyncio.run(main())