Improve API log parsing

Two runs of the same job on the same patch can yield quite different
numbers for API calls if we just count the raw calls. Many of these
are tempest polling for resources, which on a slow worker can require
many more calls than a fast one.

Tempest seems to not change its User-Agent string, but the client
libraries do. So, if we ignore the regular "python-urllib" agent
calls, we get a much more stable count of service-to-service API
calls in the performance report.

Note that we were also logging in a different (less-rich) format for
the tls-proxy.log file, which hampers our ability to parse that
data in the same format. This switches it to "combined" which is used
by the access.log and contains more useful information, like the
user-agent, among other things.

Change-Id: I8889c2e53f85c41150e1245dcbe2a79bac702aad

lib/tls

@@ -557,7 +557,7 @@ $listen_string
     ErrorLog $APACHE_LOG_DIR/tls-proxy_error.log
     ErrorLogFormat "%{cu}t [%-m:%l] [pid %P:tid %T] %7F: %E: [client\ %a] [frontend\ %A] %M% ,\ referer\ %{Referer}i"
     LogLevel info
-    CustomLog $APACHE_LOG_DIR/tls-proxy_access.log "%{%Y-%m-%d}t %{%T}t.%{msec_frac}t [%l] %a \"%r\" %>s %b"
+    CustomLog $APACHE_LOG_DIR/tls-proxy_access.log combined
 </VirtualHost>
 EOF
     if is_suse ; then

tools/get-stats.py

@@ -1,10 +1,12 @@
 #!/usr/bin/python3
 
 import argparse
+import csv
 import datetime
 import glob
 import itertools
 import json
+import logging
 import os
 import re
 import socket
@@ -25,6 +27,8 @@ except ImportError:
     print('No pymysql, database information will not be included',
           file=sys.stderr)
 
+LOG = logging.getLogger('perf')
+
 # https://www.elastic.co/blog/found-crash-elasticsearch#mapping-explosion
 
 
@@ -95,26 +99,56 @@ def get_db_stats(host, user, passwd):
 
 def get_http_stats_for_log(logfile):
     stats = {}
-    for line in open(logfile).readlines():
-        m = re.search('"([A-Z]+) /([^" ]+)( HTTP/1.1)?" ([0-9]{3}) ([0-9]+)',
-                      line)
-        if m:
-            method = m.group(1)
-            path = m.group(2)
-            status = m.group(4)
-            size = int(m.group(5))
+    apache_fields = ('host', 'a', 'b', 'date', 'tz', 'request', 'status',
+                     'length', 'c', 'agent')
+    ignore_agents = ('curl', 'uwsgi', 'nova-status')
+    for line in csv.reader(open(logfile), delimiter=' '):
+        fields = dict(zip(apache_fields, line))
+        if len(fields) != len(apache_fields):
+            # Not a combined access log, so we can bail completely
+            return []
+        try:
+            method, url, http = fields['request'].split(' ')
+        except ValueError:
+            method = url = http = ''
+        if 'HTTP' not in http:
+            # Not a combined access log, so we can bail completely
+            return []
 
-            try:
-                service, rest = path.split('/', 1)
-            except ValueError:
-                # Root calls like "GET /identity"
-                service = path
-                rest = ''
+        # Tempest's User-Agent is unchanged, but client libraries and
+        # inter-service API calls use proper strings. So assume
+        # 'python-urllib' is tempest so we can tell it apart.
+        if 'python-urllib' in fields['agent'].lower():
+            agent = 'tempest'
+        else:
+            agent = fields['agent'].split(' ')[0]
+            if agent.startswith('python-'):
+                agent = agent.replace('python-', '')
+            if '/' in agent:
+                agent = agent.split('/')[0]
 
-            stats.setdefault(service, {'largest': 0})
-            stats[service].setdefault(method, 0)
-            stats[service][method] += 1
-            stats[service]['largest'] = max(stats[service]['largest'], size)
+        if agent in ignore_agents:
+            continue
+
+        try:
+            service, rest = url.strip('/').split('/', 1)
+        except ValueError:
+            # Root calls like "GET /identity"
+            service = url.strip('/')
+            rest = ''
+
+        method_key = '%s-%s' % (agent, method)
+        try:
+            length = int(fields['length'])
+        except ValueError:
+            LOG.warning('[%s] Failed to parse length %r from line %r' % (
+                logfile, fields['length'], line))
+            length = 0
+        stats.setdefault(service, {'largest': 0})
+        stats[service].setdefault(method_key, 0)
+        stats[service][method_key] += 1
+        stats[service]['largest'] = max(stats[service]['largest'],
+                                        length)
 
     # Flatten this for ES
     return [{'service': service, 'log': os.path.basename(logfile),
@@ -131,6 +165,7 @@ def get_report_info():
     return {
         'timestamp': datetime.datetime.now().isoformat(),
         'hostname': socket.gethostname(),
+        'version': 2,
     }
 
 
@@ -152,6 +187,8 @@ if __name__ == '__main__':
                               '(default is %s)' % ','.join(process_defaults)))
     args = parser.parse_args()
 
+    logging.basicConfig(level=logging.WARNING)
+
     data = {
         'services': get_services_stats(),
         'db': pymysql and args.db_pass and get_db_stats(args.db_host,