Caching functionality for performance improvement

diff --git a/caching_data.py b/caching_data.py
new file mode 100644 (file)
index 0000000..ea3fb8c
--- /dev/null
+++ b/caching_data.py
@@ -0,0 +1,95 @@
+'''
+caching_data.py - The module contains the CachingData class.
+
+Copyright (c) 2012 Intra2net AG
+Author: Plamen Dimitrov
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+'''
+
+import pickle
+
+class CachingData:
+    """This class is responsible for the caching of data."""
+
+    def __init__(self):
+        try:
+            cachingfile = open('caching_data.pkl', 'rb')
+            self.data = pickle.load(cachingfile)
+            #print(len(self.data), "users found.")
+            self.save_flag = {}
+            for user in self.data:
+                self.save_flag[user] = {}
+                for uid_key in self.data[user]:
+                    self.save_flag[user][uid_key] = False
+        except IOError:
+            self.data = {}
+            self.save_flag = {}
+            with open('caching_data.pkl', 'wb') as cachingfile:
+                pickle.dump(self.data, cachingfile)
+
+    def __del__(self):
+        with open('caching_data.pkl', 'wb') as cachingfile:
+            # prepare data based on a save flag
+            for user in self.save_flag:
+                for uid_key in self.save_flag[user]:
+                    if(not self.save_flag[user][uid_key]):
+                        del self.data[user][uid_key]
+                        #print(uidvalidity, "deleted from cache.")
+                if(len(self.data[user])==0):
+                    del self.data[user]
+                    #print(user, "deleted from cache.")
+
+            # serialize in file
+            pickle.dump(self.data, cachingfile)
+
+        #print(len(self.data), "users stored.")
+    
+    def _cache_new_mailbox(self, username, uid_key):
+        """Store the mailbox as integer uidvalidity"""
+        if(username not in self.data):
+            self.data[username] = {}
+            self.save_flag[username] = {}
+            #print(username, "created.")
+        if(uid_key not in self.data[username]):
+            self.data[username][uid_key] = []
+            self.save_flag[username][uid_key] = False
+            #print(uid_key, "created.")
+        return
+
+    def sync_cached_mailbox(self, username, uid_key, list_ids):
+        """Adds new messages to the cache and returns a list of them.
+        Confirm the changes to a mailbox to finally save it."""
+        new_ids = []
+
+        if(username not in self.data or \
+           uid_key not in self.data[username]):
+            self._cache_new_mailbox(username, uid_key)
+            new_ids = list_ids
+        else:
+            for uid in list_ids:
+                try:
+                    self.data[username][uid_key].index(uid)
+                    #print("found", uid, uid_key)
+                except ValueError:
+                    #print("new", uid, uid_key)
+                    new_ids.append(uid)
+
+        # update cached_mailbox
+        self.data[username][uid_key] = list_ids
+
+        return new_ids
+
+    def commit_cached_mailbox(self, username, uid_key):
+        """Confirm the chages to the cached mailbox."""
+        self.save_flag[username][uid_key] = True
+        #print(username, uid_key, "committed.") 
+        return

diff --git a/date_interpreter.py b/date_interpreter.py
index 083fa1a..b494df6 100644 (file)
--- a/date_interpreter.py
+++ b/date_interpreter.py
@@ -98,6 +98,6 @@ class DateInterpreter:
         #print(date1, "<>", date2)
         timedelta = abs(date1 - date2)
         if(timedelta.total_seconds()>tolerance):
-            return 1
+            return True
         else:
-            return 0
+            return False

diff --git a/fix_imap_internaldate.py b/fix_imap_internaldate.py
index 00e0f15..7aa0675 100644 (file)
--- a/fix_imap_internaldate.py
+++ b/fix_imap_internaldate.py
@@ -25,6 +25,7 @@ import logging
 import configparser
 from date_interpreter import DateInterpreter
 from mail_iterator import MailIterator
+from caching_data import CachingData
 
 def main():
     """Iterates through csv list of users and their mailboxes"""
@@ -39,6 +40,8 @@ def main():
                         level=config.getint('basic_settings', 'log_level'))
 
     date_interp = DateInterpreter()
+    cashing_data = CachingData()
+    logging.warning(cashing_data)
     user_reader = csv.DictReader(open("userdata.csv", "r"), delimiter=',')
 
     server = config.get('basic_settings', 'imap_server')
@@ -53,12 +56,15 @@ def main():
             continue
         for mailbox in session:
             try:
-                #print(".")
+                #special key to ensure better mailbox uniqueness
+                mailbox_key = mailbox[0].strip('"') + mailbox[1]
                 mail_ids = session.fetch_messages()
+                new_ids = cashing_data.sync_cached_mailbox(user['username'], mailbox_key, mail_ids)
+                #print(len(new_ids), "new out of", len(mail_ids), "in", mailbox)
             except UserWarning as ex:
                 logging.error(ex)
                 continue
-            for mid in mail_ids:
+            for mid in new_ids:
                 try:
                     fetched_internal_date = session.fetch_internal_date(mid)
                     internal_date = date_interp.extract_internal_date(fetched_internal_date)
@@ -66,7 +72,7 @@ def main():
                     received_date = date_interp.extract_received_date(fetched_received_date)
                     if(received_date==""):
                         logging.warning("No received date could be found in message uid: %s - mailbox: %s - user: %s.\n",
-                                        mid.decode("utf-8"), mailbox.strip('"'), user['username'])
+                                        mid.decode("utf-8"), mailbox[0], user['username'])
                         continue
                 except UserWarning as ex:
                     logging.error(ex)
@@ -75,19 +81,22 @@ def main():
                     #print(received_date, internal_date)
                     if(test_mode==0):
                         try:
-                            session.update_message(mid, mailbox, received_date)
+                            session.update_message(mid, mailbox[0], received_date)
                         except UserWarning as ex:
                             logging.error(ex)
                             continue
                     else:
                         logging.info("Date conflict found in message uid: %s - mailbox: %s - user: %s.\nInternal date %s is different from received date %s from RECEIVED header:\n%s.",
-                                        mid.decode("utf-8"), mailbox.strip('"'), user['username'],
+                                        mid.decode("utf-8"), mailbox[0], user['username'],
                                         internal_date.strftime("%d %b %Y %H:%M:%S"),
                                         received_date.strftime("%d %b %Y %H:%M:%S"),
                                         fetched_received_date[0][1].decode("utf-8").split("Received:")[1])
-                    #count total emails for every user and mailbox
-                    mixed_key = user['username']+'|'+mailbox.strip('"')
-                    total_per_box[mixed_key] = 1 + total_per_box.get(mixed_key, 0)
+                    # count total emails for every user and mailbox
+                    user_key = user['username']+'|'+mailbox[0].strip('"')
+                    total_per_box[user_key] = 1 + total_per_box.get(user_key, 0)
+            # if all messages were successfully fixed confirm caching
+            cashing_data.commit_cached_mailbox(user['username'], mailbox_key)
+        # final report on date conflicts
         total_per_user = 0
         for warning in total_per_box:
             total_per_user += total_per_box[warning]

diff --git a/mail_iterator.py b/mail_iterator.py
index b217f4a..1119945 100644 (file)
--- a/mail_iterator.py
+++ b/mail_iterator.py
@@ -23,11 +23,11 @@ import imaplib
 import re
 import time
 
-LIST_RESP = re.compile(r'\((?P<flags>.*?)\) "(?P<delimiter>.*)" (?P<name>.*)')
+MAILBOX_RESP = re.compile(r'\((?P<flags>.*?)\) "(?P<delimiter>.*)" (?P<name>.*)')
+UIDVAL_RESP = re.compile(r'(?P<name>.*) \(UIDVALIDITY (?P<uidval>.*)\)')
 
 class MailIterator:
     """This class communicates with the e-mail server."""
-    mailboxes = []
 
     def __init__(self, server, username, password):
         """Creates a connection and a user session."""
@@ -45,12 +45,17 @@ class MailIterator:
         self.mail_con.logout()
 
     def __iter__(self):
-        """Iterates through the retrieved mailboxes."""
+        """Iterates through all mailboxes, returns (uidval,name)."""
         for mailbox in self.mailboxes:
-            mailbox = LIST_RESP.match(mailbox.decode("utf-8")).groups()
-            #print("Checking mailbox ", mailbox[2])
+            #print("Checking mailbox ", mailbox)
+            mailbox = MAILBOX_RESP.match(mailbox.decode("utf-8")).groups()
+            result, data = self.mail_con.status(mailbox[2], '(UIDVALIDITY)')
+            if(result!="OK"):
+                raise UserWarning("Could not retrieve mailbox uidvalidity.")
+            uidval = UIDVAL_RESP.match(data[0].decode("utf-8")).groups()
+            #print(data[0], uidval)
             self.mail_con.select(mailbox[2])
-            yield mailbox[2]
+            yield (mailbox[2], uidval[1])
 
     def fetch_messages(self):
         """Fetches the messages from the current mailbox, return list of uids."""

diff --git a/sample_performance_report.txt b/sample_performance_report.txt
new file mode 100644 (file)
index 0000000..8b80c4b
--- /dev/null
+++ b/sample_performance_report.txt
@@ -0,0 +1,1066 @@
+CACHING PERFORMANCE REPORT:
+---------------------------
+
+STATISTICS WITHOUT CACHING:
+
+64349556 function calls (64349003 primitive calls) in 1052.038 seconds
+
+   Ordered by: standard name
+
+   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
+        1    0.000    0.000    0.000    0.000 __init__.py:1001(_StderrHandler)
+        1    0.000    0.000    0.000    0.000 __init__.py:1007(__init__)
+        1    0.000    0.000    0.000    0.000 __init__.py:1025(PlaceHolder)
+        1    0.000    0.000    0.000    0.000 __init__.py:1069(Manager)
+        1    0.000    0.000    0.000    0.000 __init__.py:1074(__init__)
+        1    0.000    0.000    0.000    0.000 __init__.py:1177(Logger)
+        1    0.000    0.000    0.000    0.000 __init__.py:1192(__init__)
+        1    0.000    0.000    0.000    0.000 __init__.py:1204(setLevel)
+      135    0.001    0.000    0.042    0.000 __init__.py:1234(warning)
+      135    0.002    0.000    0.003    0.000 __init__.py:1298(findCaller)
+      135    0.001    0.000    0.009    0.000 __init__.py:1328(makeRecord)
+      135    0.001    0.000    0.040    0.000 __init__.py:1343(_log)
+      135    0.001    0.000    0.026    0.000 __init__.py:1366(handle)
+        1    0.000    0.000    0.000    0.000 __init__.py:1376(addHandler)
+      135    0.001    0.000    0.026    0.000 __init__.py:1420(callHandlers)
+      135    0.000    0.000    0.000    0.000 __init__.py:1450(getEffectiveLevel)
+      135    0.000    0.000    0.001    0.000 __init__.py:1464(isEnabledFor)
+      135    0.001    0.000    0.001    0.000 __init__.py:148(getLevelName)
+        1    0.000    0.000    0.000    0.000 __init__.py:1491(RootLogger)
+        1    0.000    0.000    0.000    0.000 __init__.py:1497(__init__)
+        1    0.000    0.000    0.000    0.000 __init__.py:1505(LoggerAdapter)
+        1    0.000    0.000    0.001    0.001 __init__.py:1625(basicConfig)
+      135    0.001    0.000    0.043    0.000 __init__.py:1735(warning)
+        4    0.000    0.000    0.000    0.000 __init__.py:177(_checkLevel)
+        1    0.000    0.000    0.000    0.000 __init__.py:1819(NullHandler)
+        4    0.000    0.000    0.000    0.000 __init__.py:206(_acquireLock)
+        4    0.000    0.000    0.000    0.000 __init__.py:215(_releaseLock)
+        1    0.000    0.000    0.000    0.000 __init__.py:226(LogRecord)
+      135    0.004    0.000    0.009    0.000 __init__.py:238(__init__)
+        1    0.035    0.035    0.037    0.037 __init__.py:24(<module>)
+      135    0.001    0.000    0.001    0.000 __init__.py:308(getMessage)
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+      135    0.000    0.000    0.001    0.000 __init__.py:366(usesTime)
+      135    0.001    0.000    0.001    0.000 __init__.py:369(format)
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+      135    0.001    0.000    0.003    0.000 __init__.py:469(formatTime)
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+       47    0.000    0.000    0.000    0.000 cashing_data.py:91(commit_cached_mailbox)
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+
+
+
+
+
+
+STATISTICS WITH CACHING:
+
+344848 function calls (344387 primitive calls) in 136.603 seconds
+
+   Ordered by: standard name
+
+   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
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