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ApiLogger plugin: dumps some information about API hits to aid in researching future HTTP-level cachability improvements.

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Data are sent to the 'info' level of logging, like so:

  [lazarus.local:4812.86b23603 GET /mublog/api/statuses/friends_timeline.atom?since_id=1353]
       STATLOG action:apitimelinefriends method:GET ssl:no query:since_id cookie:no auth:yes
       ifmatch:no ifmod:no agent:Appcelerator Titanium/1.4.1 (iPhone/4.1; iPhone OS; en_US;)

Fields:
* action:  case-normalized name of the action class we're acting on
* method:  GET, POST, HEAD, etc
* ssl:     Are we on HTTPS? 'yes' or 'no'
* query:   Were we sent a query string? 'yes', 'no', or 'since_id' if the only parameter is a since_id
* cookie:  Were we sent any cookies? 'yes' or 'no'
* auth:    Were we sent an HTTP Authorization header? 'yes' or 'no'
* ifmatch: Were we sent an HTTP If-Match header for an ETag? 'yes' or 'no'
* ifmod:   Were we sent an HTTP If-Modified-Since header? 'yes' or 'no'
* agent:   User-agent string, to aid in figuring out what these things are

The most shared-cache-friendly requests will be non-SSL GET requests with no or very predictable
query parameters, no cookies, and no authorization headers. Private caching (eg within a supporting
user-agent) could still be friendly to SSL and auth'd GET requests.

We kind of expect that the most frequent hits from clients will be GETs for a few common timelines,
with auth headers, a since_id-only query, and no cookies. These should at least be amenable to
returning 304 matches for etags or last-modified headers with private caching, but it's very
possible that most clients won't actually think to save and send them. That would leave us expecting
to handle a lot of timeline since_id hits that return a valid API response with no notices.

At this point we don't expect to actually see if-match or if-modified-since a lot since most of our
API responses are marked as uncacheable; so even if we output them they're not getting sent back to
us.

Random subsampling can be enabled by setting the 'frequency' parameter smaller than 1.0:

  addPlugin('ApiLogger', array(
    'frequency' => 0.5 // Record 50% of API hits
  ));
This commit is contained in:
Brion Vibber 2010-10-27 16:30:11 -07:00
parent 22a0cf6251
commit ace655aecf
1 changed files with 69 additions and 0 deletions
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69
plugins/ApiLogger/ApiLoggerPlugin.php Normal file
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<?php
/*
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @package ApiLoggerPlugin
* @maintainer Brion Vibber <brion@status.net>
*/
if (!defined('STATUSNET')) {
exit(1);
}
class ApiLoggerPlugin extends Plugin
{
// Lower this to do random sampling of API requests rather than all.
// 0.1 will check about 10% of hits, etc.
public $frequency = 1.0;
function onArgsInitialize($args)
{
if (isset($args['action'])) {
$action = strtolower($args['action']);
if (substr($action, 0, 3) == 'api') {
if ($this->frequency < 1.0 && $this->frequency > 0.0) {
$max = mt_getrandmax();
$n = mt_rand() / $max;
if ($n > $this->frequency) {
return true;
}
}
$uri = $_SERVER['REQUEST_URI'];
$method = $_SERVER['REQUEST_METHOD'];
$ssl = empty($_SERVER['HTTPS']) ? 'no' : 'yes';
$cookie = empty($_SERVER['HTTP_COOKIE']) ? 'no' : 'yes';
$etag = empty($_SERVER['HTTP_IF_MATCH']) ? 'no' : 'yes';
$last = empty($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? 'no' : 'yes';
$auth = empty($_SERVER['HTTP_AUTHORIZATION']) ? 'no' : 'yes';
$agent = empty($_SERVER['HTTP_USER_AGENT']) ? 'no' : $_SERVER['HTTP_USER_AGENT'];
$query = (strpos($uri, '?') === false) ? 'no' : 'yes';
if ($query == 'yes') {
if (preg_match('/\?since_id=\d+$/', $uri)) {
$query = 'since_id';
}
}
common_log(LOG_INFO, "STATLOG action:$action method:$method ssl:$ssl query:$query cookie:$cookie auth:$auth ifmatch:$etag ifmod:$last agent:$agent");
}
}
return true;
}
}