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99 lines
3.1 KiB
99 lines
3.1 KiB
# -*- coding: utf-8 -*-
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# Copyright 2024 Mike Fährmann
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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"""Download Archives"""
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import os
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import sqlite3
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from . import formatter
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class DownloadArchive():
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def __init__(self, path, format_string, pragma=None,
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cache_key="_archive_key"):
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try:
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con = sqlite3.connect(path, timeout=60, check_same_thread=False)
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except sqlite3.OperationalError:
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os.makedirs(os.path.dirname(path))
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con = sqlite3.connect(path, timeout=60, check_same_thread=False)
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con.isolation_level = None
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self.keygen = formatter.parse(format_string).format_map
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self.connection = con
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self.close = con.close
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self.cursor = cursor = con.cursor()
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self._cache_key = cache_key
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if pragma:
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for stmt in pragma:
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cursor.execute("PRAGMA " + stmt)
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try:
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cursor.execute("CREATE TABLE IF NOT EXISTS archive "
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"(entry TEXT PRIMARY KEY) WITHOUT ROWID")
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except sqlite3.OperationalError:
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# fallback for missing WITHOUT ROWID support (#553)
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cursor.execute("CREATE TABLE IF NOT EXISTS archive "
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"(entry TEXT PRIMARY KEY)")
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def add(self, kwdict):
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"""Add item described by 'kwdict' to archive"""
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key = kwdict.get(self._cache_key) or self.keygen(kwdict)
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self.cursor.execute(
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"INSERT OR IGNORE INTO archive (entry) VALUES (?)", (key,))
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def check(self, kwdict):
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"""Return True if the item described by 'kwdict' exists in archive"""
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key = kwdict[self._cache_key] = self.keygen(kwdict)
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self.cursor.execute(
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"SELECT 1 FROM archive WHERE entry=? LIMIT 1", (key,))
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return self.cursor.fetchone()
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def finalize(self):
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pass
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class DownloadArchiveMemory(DownloadArchive):
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def __init__(self, path, format_string, pragma=None,
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cache_key="_archive_key"):
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DownloadArchive.__init__(self, path, format_string, pragma, cache_key)
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self.keys = set()
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def add(self, kwdict):
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self.keys.add(
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kwdict.get(self._cache_key) or
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self.keygen(kwdict))
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def check(self, kwdict):
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key = kwdict[self._cache_key] = self.keygen(kwdict)
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if key in self.keys:
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return True
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self.cursor.execute(
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"SELECT 1 FROM archive WHERE entry=? LIMIT 1", (key,))
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return self.cursor.fetchone()
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def finalize(self):
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if not self.keys:
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return
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cursor = self.cursor
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with self.connection:
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try:
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cursor.execute("BEGIN")
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except sqlite3.OperationalError:
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pass
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stmt = "INSERT OR IGNORE INTO archive (entry) VALUES (?)"
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if len(self.keys) < 100:
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for key in self.keys:
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cursor.execute(stmt, (key,))
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else:
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cursor.executemany(stmt, ((key,) for key in self.keys))
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