formatting/add meme endpoints

utils/meme_util.py

@@ -0,0 +1,77 @@
+import os
+import io
+from typing import Optional
+import aiosqlite as sqlite3
+from PIL import Image
+
+
+class MemeUtil:
+    """
+    Meme Utils
+    """
+
+    def __init__(self, constants) -> None:
+        self.constants = constants
+        self.meme_db_path = os.path.join("/usr/local/share", "sqlite_dbs", "meme.db")
+
+    def convert_to_png(self, in_buffer: io.BytesIO) -> bytes:
+        in_buffer.seek(0)
+        with Image.open(in_buffer) as im:
+            if im.format == "PNG":
+                raise ValueError("Already a PNG")
+            out_buffer = io.BytesIO()
+            im.save(out_buffer, format="PNG")
+            out_buffer.seek(0)
+        return out_buffer.read()
+
+    async def get_meme_by_id(self, meme_id: int) -> Optional[bytes]:
+        """
+        Get meme by id
+        Args:
+            meme_id (int)
+        Returns:
+            Optional[bytes]
+        """
+        ret_image: Optional[bytes] = None
+        buffer: Optional[io.BytesIO] = None
+        async with sqlite3.connect(self.meme_db_path, timeout=5) as db_conn:
+            db_conn.row_factory = sqlite3.Row
+            query: str = "SELECT image FROM memes WHERE id = ? LIMIT 1"
+            async with await db_conn.execute(query, (meme_id,)) as db_cursor:
+                result = await db_cursor.fetchone()
+                if not result:
+                    return None
+                buffer = io.BytesIO(result["image"])
+                with Image.open(buffer) as im:
+                    if im.format != "PNG":
+                        ret_image = self.convert_to_png(buffer)
+                    else:
+                        ret_image = result["image"]
+                return ret_image
+
+    async def list_memes(self, page: int) -> Optional[list]:
+        """
+        List memes (paginated)
+        Args:
+            page (id)
+        Returns:
+            list
+        """
+        out_result: list = []
+        async with sqlite3.connect(self.meme_db_path, timeout=5) as db_conn:
+            db_conn.row_factory = sqlite3.Row
+            rows_per_page: int = 10
+            offset: int = (page - 1) * rows_per_page
+            query: str = "SELECT id, timestamp FROM memes ORDER BY timestamp DESC LIMIT 10 OFFSET ?"
+            async with await db_conn.execute(query, (offset,)) as db_cursor:
+                results = await db_cursor.fetchall()
+                for result in results:
+                    result_id = result["id"]
+                    result_timestamp = result["timestamp"]
+                    out_result.append(
+                        {
+                            "id": result_id,
+                            "timestamp": result_timestamp,
+                        }
+                    )
+        return out_result