From dd54f9ff13ee0d377480f033a49cc4b5aa8abe5a Mon Sep 17 00:00:00 2001
From: Alan Hamlett <alan.hamlett@gmail.com>
Date: Tue, 12 May 2015 14:58:20 -0700
Subject: [PATCH] reuse SSL handshake across multiple processes for improved
 performance

---
 wakatime/base.py          |  15 ++++--
 wakatime/offlinequeue.py  |   7 ++-
 wakatime/session_cache.py | 109 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 122 insertions(+), 9 deletions(-)
 create mode 100644 wakatime/session_cache.py

diff --git a/wakatime/base.py b/wakatime/base.py
index 9ac3d98..30186c8 100644
--- a/wakatime/base.py
+++ b/wakatime/base.py
@@ -29,14 +29,14 @@ sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), 'pac
 
 from .__about__ import __version__
 from .compat import u, open, is_py3
-from .offlinequeue import Queue
 from .logger import setup_logging
-from .project import find_project
-from .stats import get_file_stats
+from .offlinequeue import Queue
 from .packages import argparse
 from .packages import simplejson as json
-from .packages import requests
 from .packages.requests.exceptions import RequestException
+from .project import find_project
+from .session_cache import SessionCache
+from .stats import get_file_stats
 try:
     from .packages import tzlocal
 except:
@@ -360,10 +360,13 @@ def send_heartbeat(project=None, branch=None, stats={}, key=None, targetFile=Non
     if tz:
         headers['TimeZone'] = u(tz.zone)
 
+    session_cache = SessionCache()
+    session = session_cache.get()
+
     # log time to api
     response = None
     try:
-        response = requests.post(api_url, data=request_body, headers=headers,
+        response = session.post(api_url, data=request_body, headers=headers,
                                  proxies=proxies)
     except RequestException:
         exception_data = {
@@ -385,6 +388,7 @@ def send_heartbeat(project=None, branch=None, stats={}, key=None, targetFile=Non
             log.debug({
                 'response_code': response_code,
             })
+            session_cache.save(session)
             return True
         if offline:
             if response_code != 400:
@@ -410,6 +414,7 @@ def send_heartbeat(project=None, branch=None, stats={}, key=None, targetFile=Non
                 'response_code': response_code,
                 'response_content': response_content,
             })
+    session_cache.delete()
     return False
 
 
diff --git a/wakatime/offlinequeue.py b/wakatime/offlinequeue.py
index 2f57ab3..ebbc2d3 100644
--- a/wakatime/offlinequeue.py
+++ b/wakatime/offlinequeue.py
@@ -1,10 +1,9 @@
 # -*- coding: utf-8 -*-
 """
-    wakatime.queue
-    ~~~~~~~~~~~~~~
+    wakatime.offlinequeue
+    ~~~~~~~~~~~~~~~~~~~~~
 
-    Queue for offline time logging.
-    http://wakatime.com
+    Queue for saving heartbeats while offline.
 
     :copyright: (c) 2014 Alan Hamlett.
     :license: BSD, see LICENSE for more details.
diff --git a/wakatime/session_cache.py b/wakatime/session_cache.py
new file mode 100644
index 0000000..7986fa0
--- /dev/null
+++ b/wakatime/session_cache.py
@@ -0,0 +1,109 @@
+# -*- coding: utf-8 -*-
+"""
+    wakatime.session_cache
+    ~~~~~~~~~~~~~~~~~~~~~~
+
+    Persist requests.Session for multiprocess SSL handshake pooling.
+
+    :copyright: (c) 2015 Alan Hamlett.
+    :license: BSD, see LICENSE for more details.
+"""
+
+
+import logging
+import os
+import pickle
+import sys
+import traceback
+
+try:
+    import sqlite3
+    HAS_SQL = True
+except ImportError:
+    HAS_SQL = False
+
+sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), 'packages'))
+
+from .packages import requests
+
+
+log = logging.getLogger('WakaTime')
+
+
+class SessionCache(object):
+    DB_FILE = os.path.join(os.path.expanduser('~'), '.wakatime.db')
+
+    def connect(self):
+        conn = sqlite3.connect(self.DB_FILE)
+        c = conn.cursor()
+        c.execute('''CREATE TABLE IF NOT EXISTS session (
+            value BLOB)
+        ''')
+        return (conn, c)
+
+
+    def save(self, session):
+        """Saves a requests.Session object for the next heartbeat process.
+        """
+
+        if not HAS_SQL:
+            return
+        try:
+            conn, c = self.connect()
+            c.execute('DELETE FROM session')
+            values = {
+                'value': pickle.dumps(session),
+            }
+            c.execute('INSERT INTO session VALUES (:value)', values)
+            conn.commit()
+            conn.close()
+        except:
+            log.error(traceback.format_exc())
+
+
+    def get(self):
+        """Returns a requests.Session object.
+
+        Gets Session from sqlite3 cache or creates a new Session.
+        """
+
+        if not HAS_SQL:
+            return requests.session()
+
+        try:
+            conn, c = self.connect()
+        except:
+            log.error(traceback.format_exc())
+            return requests.session()
+
+        session = None
+        try:
+            c.execute('BEGIN IMMEDIATE')
+            c.execute('SELECT value FROM session LIMIT 1')
+            row = c.fetchone()
+            if row is not None:
+                session = pickle.loads(row[0])
+        except:
+            log.error(traceback.format_exc())
+
+        try:
+            conn.close()
+        except:
+            log.error(traceback.format_exc())
+
+        return session if session is not None else requests.session()
+
+
+    def delete(self):
+        """Clears all cached Session objects.
+        """
+
+        if not HAS_SQL:
+            return
+        try:
+            conn, c = self.connect()
+            c.execute('DELETE FROM session')
+            conn.commit()
+            conn.close()
+        except:
+            log.error(traceback.format_exc())