diff --git a/gallery_dl/__init__.py b/gallery_dl/__init__.py
index 3657cabb..bd455204 100644
--- a/gallery_dl/__init__.py
+++ b/gallery_dl/__init__.py
@@ -1,13 +1,13 @@
 # -*- coding: utf-8 -*-
 
-# Copyright 2014, 2015 Mike Fährmann
+# Copyright 2014-2016 Mike Fährmann
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 as
 # published by the Free Software Foundation.
 
 __author__     = "Mike Fährmann"
-__copyright__  = "Copyright 2014, 2015 Mike Fährmann"
+__copyright__  = "Copyright 2014-2016 Mike Fährmann"
 
 __license__    = "GPLv2"
 __version__    = "0.4.1"
@@ -15,9 +15,8 @@ __maintainer__ = "Mike Fährmann"
 __email__      = "mike_faehrmann@web.de"
 
 import os
-import sys
 import argparse
-from . import config, extractor, jobs
+from . import config, extractor, jobs, cache
 
 def build_cmdline_parser():
     parser = argparse.ArgumentParser(
@@ -81,6 +80,7 @@ def main():
         else:
             if not args.urls:
                 parser.error("the following arguments are required: URL")
+            cache.init_database()
             if args.list_urls:
                 jobtype = jobs.UrlJob
             elif args.list_keywords:
diff --git a/gallery_dl/extractor/pixiv.py b/gallery_dl/extractor/pixiv.py
index 8baf1cfc..e79f50e8 100644
--- a/gallery_dl/extractor/pixiv.py
+++ b/gallery_dl/extractor/pixiv.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-# Copyright 2014, 2015 Mike Fährmann
+# Copyright 2014-2016 Mike Fährmann
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 as
@@ -10,6 +10,7 @@
 
 from .common import Extractor, Message
 from .. import config, text
+from ..cache import cache
 import re
 import json
 import time
@@ -192,10 +193,7 @@ class PixivBookmarkExtractor(PixivFavoriteExtractor):
 def require_login(func):
     """Decorator: auto-login before api-calls"""
     def wrap(self, *args):
-        now = time.time()
-        if now - self.last_login > PixivAPI.token_timeout:
-            self.login()
-            self.last_login = now
+        self.login()
         return func(self, *args)
     return wrap
 
@@ -207,52 +205,19 @@ class PixivAPI():
     For in-depth information regarding the Pixiv Public-API, see
     - http://blog.imaou.com/opensource/2014/10/09/pixiv_api_for_ios_update.html
     """
-    token_timeout = 50*60 # 50 minutes
-
     def __init__(self, session):
-        self.last_login = 0
         self.session = session
         self.session.headers.update({
             "Referer": "http://www.pixiv.net/",
             "User-Agent": "PixivIOSApp/5.8.0",
         })
-        config.setdefault(("extractor", "pixiv"), {})
+        self.username = config.interpolate(("extractor", "pixiv", "username"))
+        self.password = config.interpolate(("extractor", "pixiv", "password"))
 
     def login(self):
         """Login and gain a Pixiv Public-API access token"""
-        pconf = config.get(("extractor", "pixiv"))
-        token = pconf.get("access-token")
-        now = time.time()
-        if token:
-            timestamp = pconf.get("access-token-timestamp", 0)
-            if now - timestamp > PixivAPI.token_timeout:
-                token = None
-        if not token:
-            data = {
-                "username": pconf.get("username"),
-                "password": pconf.get("password"),
-                "grant_type": "password",
-                "client_id": "bYGKuGVw91e0NMfPGp44euvGt59s",
-                "client_secret": "HP3RmkgAmEGro0gn1x9ioawQE8WMfvLXDz3ZqxpK",
-            }
-            response = self.session.post(
-                "https://oauth.secure.pixiv.net/auth/token", data=data
-            )
-            if response.status_code not in (200, 301, 302):
-                raise Exception("login() failed! check username and password.\n"
-                                "HTTP %s: %s" % (response.status_code, response.text))
-            try:
-                response = self._parse(response)["response"]
-                token = response["access_token"]
-                self.token_timeout = response["expires_in"]
-                self.user_id = response["user"]["id"]
-            except:
-                raise Exception("Get access_token error! Response: %s" % (token))
-            pconf["access-token"] = token
-            pconf["access-token-timestamp"] = now - 1
-        self.session.headers["Authorization"] = (
-            "Bearer " + token
-        )
+        self.user_id, token = self._do_login(self.username, self.password)
+        self.session.headers["Authorization"] = "Bearer " + token
 
     @require_login
     def user(self, user_id):
@@ -304,6 +269,29 @@ class PixivAPI():
         )
         return self._parse(response)
 
+    @cache(maxage=50*60, keyarg=1)
+    def _do_login(self, username, password):
+        data = {
+            "username": username,
+            "password": password,
+            "grant_type": "password",
+            "client_id": "bYGKuGVw91e0NMfPGp44euvGt59s",
+            "client_secret": "HP3RmkgAmEGro0gn1x9ioawQE8WMfvLXDz3ZqxpK",
+        }
+        response = self.session.post(
+            "https://oauth.secure.pixiv.net/auth/token", data=data
+        )
+        if response.status_code not in (200, 301, 302):
+            raise Exception("login() failed! check username and password.\n"
+                            "HTTP %s: %s" % (response.status_code, response.text))
+        try:
+            response = self._parse(response)["response"]
+            token = response["access_token"]
+            user = response["user"]["id"]
+        except:
+            raise Exception("Get access_token error! Response: %s" % (token))
+        return user, token
+
     @staticmethod
     def _parse(response):
         """Parse a Pixiv Public-API response"""