[archive] move DownloadArchive into its own module

gallery_dl/util.py

@@ -16,7 +16,6 @@ import time
 import random
 import getpass
 import hashlib
-import sqlite3
 import binascii
 import datetime
 import functools
@@ -852,46 +851,3 @@ class FilterPredicate():
             raise
         except Exception as exc:
             raise exception.FilterError(exc)
-
-
-class DownloadArchive():
-
-    def __init__(self, path, format_string, pragma=None,
-                 cache_key="_archive_key"):
-        try:
-            con = sqlite3.connect(path, timeout=60, check_same_thread=False)
-        except sqlite3.OperationalError:
-            os.makedirs(os.path.dirname(path))
-            con = sqlite3.connect(path, timeout=60, check_same_thread=False)
-        con.isolation_level = None
-
-        from . import formatter
-        self.keygen = formatter.parse(format_string).format_map
-        self.close = con.close
-        self.cursor = cursor = con.cursor()
-        self._cache_key = cache_key
-
-        if pragma:
-            for stmt in pragma:
-                cursor.execute("PRAGMA " + stmt)
-
-        try:
-            cursor.execute("CREATE TABLE IF NOT EXISTS archive "
-                           "(entry TEXT PRIMARY KEY) WITHOUT ROWID")
-        except sqlite3.OperationalError:
-            # fallback for missing WITHOUT ROWID support (#553)
-            cursor.execute("CREATE TABLE IF NOT EXISTS archive "
-                           "(entry TEXT PRIMARY KEY)")
-
-    def check(self, kwdict):
-        """Return True if the item described by 'kwdict' exists in archive"""
-        key = kwdict[self._cache_key] = self.keygen(kwdict)
-        self.cursor.execute(
-            "SELECT 1 FROM archive WHERE entry=? LIMIT 1", (key,))
-        return self.cursor.fetchone()
-
-    def add(self, kwdict):
-        """Add item described by 'kwdict' to archive"""
-        key = kwdict.get(self._cache_key) or self.keygen(kwdict)
-        self.cursor.execute(
-            "INSERT OR IGNORE INTO archive (entry) VALUES (?)", (key,))