From 0b995676e020ae8134357d9992a0eb0fa74cc900 Mon Sep 17 00:00:00 2001
From: drebs <drebs@leap.se>
Date: Mon, 3 Feb 2014 15:14:02 -0200
Subject: Add script to find maximum upload size on a soledad/couch node.

---
 find_max_upload_size.py | 169 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 169 insertions(+)
 create mode 100755 find_max_upload_size.py

diff --git a/find_max_upload_size.py b/find_max_upload_size.py
new file mode 100755
index 0000000..2bb69a2
--- /dev/null
+++ b/find_max_upload_size.py
@@ -0,0 +1,169 @@
+#!/usr/bin/python
+
+# This script finds the maximum upload size for a document in the current
+# server. It pulls couch URL from Soledad config file and attempts multiple
+# PUTs until it finds the maximum size supported by the server.
+#
+# As the Soledad couch user is not an admin, you have to pass a database into
+# which the test will be run. The database should already exist and be
+# initialized with soledad design documents.
+#
+# Use it like this:
+#
+#     ./find_max_upload_size.py <dbname>
+#     ./find_max_upload_size.py -h
+
+import os
+import configparser
+import couchdb
+import logging
+import argparse
+import random
+import string
+import binascii
+import json
+
+
+SOLEDAD_CONFIG_FILE = '/etc/leap/soledad-server.conf'
+PREFIX = '/tmp/soledad_test'
+LOG_FORMAT = '%(asctime)s %(levelname)s %(message)s'
+
+
+# configure logger
+logger = logging.getLogger(__name__)
+
+
+def config_log(level):
+    logging.basicConfig(format=LOG_FORMAT, level=level)
+
+
+def log_to_file(filename):
+    handler = logging.FileHandler(filename, mode='a')
+    handler.setFormatter(logging.Formatter(fmt=LOG_FORMAT))
+    logger.addHandler(handler)
+
+
+# create test dir
+if not os.path.exists(PREFIX):
+    os.mkdir(PREFIX)
+
+
+def get_couch_url(config_file=SOLEDAD_CONFIG_FILE):
+    config = configparser.ConfigParser()
+    config.read(config_file)
+    return config['soledad-server']['couch_url']
+
+
+# generate or load an uploadable doc with the given size in mb
+def gen_body(size):
+    if os.path.exists(
+            os.path.join(PREFIX, 'body-%d.json' % size)):
+        logger.debug('Loading body with %d MB...' % size)
+        with open(os.path.join(PREFIX, 'body-%d.json' % size), 'r') as f:
+            return json.loads(f.read())
+    else:
+        length = int(size * 1024 ** 2)
+        hexdata = binascii.hexlify(os.urandom(length))[:length]
+        body = {
+            'couch_rev': None,
+            'u1db_rev': '1',
+            'content': hexdata,
+            'trans_id': '1',
+            'conflicts': None,
+            'update_conflicts': False,
+        }
+        logger.debug('Generating body with %d MB...' % size)
+        with open(os.path.join(PREFIX, 'body-%d.json' % size), 'w+') as f:
+            f.write(json.dumps(body))
+        return body
+
+
+def delete_doc(db):
+    doc = db.get('largedoc')
+    db.delete(doc)
+
+
+def upload(db, size):
+    ddoc_path = ['_design', 'docs', '_update', 'put', 'largedoc']
+    resource = db.resource(*ddoc_path)
+    body = gen_body(size)
+    try:
+        logger.debug('Uploading %d MB body...' % size)
+        response = resource.put_json(
+            body=body,
+            headers={'content-type': 'application/json'})
+        # the document might have been updated in between, so we check for
+        # the return message
+        msg = response[2].read()
+        if msg == 'ok':
+            delete_doc(db)
+            logger.debug('Success uploading %d MB doc.' % size)
+            return True
+        else:
+            # should not happen
+            logger.error('Unexpected error uploading %d MB doc: %s' % (size, msg))
+            return False
+    except Exception as e:
+        logger.debug('Failed to upload %d MB doc: %s' % (size, str(e)))
+        return False
+
+
+def find_max_upload_size(dbname):
+    couch_url = get_couch_url()
+    db_url = '%s/%s' % (couch_url, dbname)
+    logger.debug('Couch URL: %s' % db_url)
+    # get a 'raw' couch handler
+    server = couchdb.client.Server(couch_url)
+    db = server[dbname]
+    # delete eventual leftover from last run
+    largedoc = db.get('largedoc')
+    if largedoc is not None:
+        db.delete(largedoc)
+    # phase 1: increase upload size exponentially
+    logger.info('Starting phase 1: increasing size exponentially.')
+    size = 1
+    while True:
+        if upload(db, size):
+            size *= 2
+        else:
+            break
+    # phase 2: binary search for maximum value
+    unable = size
+    able = size / 2
+    logger.info('Starting phase 2: binary search for maximum value.')
+    while unable - able > 1:
+        size = able + ((unable - able) / 2)
+        if upload(db, size):
+            able = size
+        else:
+            unable = size
+    return able
+
+
+if __name__ == '__main__':
+    # parse command line
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        '-d', action='store_true', dest='debug',
+        help='print debugging information')
+    parser.add_argument(
+        '-l', dest='logfile',
+        help='log output to file')
+    parser.add_argument(
+        'dbname', help='the name of the database to test in')
+    args = parser.parse_args()
+
+    # log to file
+    if args.logfile is not None:
+        log_to_file(args.logfile)
+
+    # set loglevel
+    if args.debug is True:
+        config_log(logging.DEBUG)
+    else:
+        config_log(logging.INFO)
+
+    # run test and report
+    logger.info('Will test using db %s.' % args.dbname)
+    maxsize = find_max_upload_size(args.dbname)
+    logger.info('Max upload size is %d MB.' % maxsize)
-- 
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