我正在根据以下PHP代码捕获网页查看器日志...
$viewerlog = "../SiteLogFiles/live-smoothstreaming-" . date('Ymd') . ".txt";
$fp = fopen($viewerlog,"a");
if ($fp) {
fputs($fp,"-----------------------------------------------------------------------\r\n");
fputs($fp,"Server Date: $now\r\n");
fputs($fp,"IP Address: $ip\r\n");
fputs($fp,"City: $city\r\n");
fputs($fp,"State: $state\r\n");
fputs($fp,"Country Name: $countryname\r\n");
fputs($fp,"Continent: $continent\r\n");
fputs($fp,"-----------------------------------------------------------------------\r\n");
fclose($fp);
}
它产生这样的日志......
-----------------------------------------------------------------------
Server Date: 2013-01-06T05:32:06-06:00
IP Address: 157.55.32.61
City: Unknown
State: Unknown
Country Name: United States
Continent: North America
-----------------------------------------------------------------------
-----------------------------------------------------------------------
Server Date: 2013-01-06T06:02:40-06:00
IP Address: 157.55.32.187
City: Unknown
State: Unknown
Country Name: United States
Continent: North America
-----------------------------------------------------------------------
但是不时地，日志会被破坏并且看起来像这样......
-----------------------------------------------------------------------
Server Date: 2012-12-21T18:27:27-06:00
IP Address: 99.54.103.128
City: Columbus
State: Ohio
Country Name: United States
Continent: North America
-----------------------------------------------------------------------
-----------------------------------------------------------------------
Server Date: 2012-12-21T18:27:53-06:00
IP Address: 75.97.98.115
City: Palmerton
State: Pennsylvania
--------------------------------------Continent: North America
Server Date: 2012-12-21T18:27:54-06:00
---------------------
IP Address: 70.76.36.232
City: Saskatoon
State: Saskatchewan
Country Name: Canada
Continent: North America
-----------------------------------------------------------------------
-----------------------------------------------------------------------
Server Date: 2012-12-21T18:28:04-06:00
IP Address: 173.17.240.190
City: Springfield
State: Missouri
Country Name: United States
Continent: North America
-----------------------------------------------------------------------
值得注意的是，我正在使用http://www.easyjquery.com从IP地址获取位置信息。
因此，不同的人建议使用SQL数据库进行日志记录，而不是使用平面文本日志。有了这些建议，我就能够设置所说的SQL数据库。我能够在1秒内写出7条记录（尽可能快地击中F5），没有问题。
正在使用的PHP代码如下......
try {
$dbh = new PDO("sqlsrv:Server=localhost;Database=ViewerLogs", "", "");
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $dbh->query("INSERT INTO dbo.LiveSmoothStreaming (DateTime, Ip, City, State, Country, Continent) VALUES('$now', '$ip', '$city', '$state', '$countryname', '$continent')");
$stmt->setFetchMode(PDO::FETCH_ASSOC);
$dbh = null;
}
catch(PDOException $e) {
echo $e->getMessage();
}
但是有一个问题。我的平面文本日志似乎捕获的记录多于SQL日志。
平面文字日志正在制作......
Tue 5:58pm 68.55.34.32 Laurel Maryland United States North America
Tue 5:58pm 70.88.57.62 Port Charlotte Florida United States North America
Tue 5:59pm 98.19.198.54 Eastview Kentucky United States North America
Tue 5:59pm 71.3.202.110 Cape Coral Florida United States North America
Tue 5:59pm 173.218.32.154 Branson Missouri United States North America
Tue 5:59pm 184.38.238.64 Unknown Unknown United States North America
Tue 5:59pm 67.239.18.161 Naples Florida United States North America
SQL日志正在生成......
2013-02-05T17:58:45-06:00 68.55.34.32 Laurel Maryland United States North America
2013-02-05T17:58:52-06:00 70.88.57.62 Port Charlotte Florida United States North America
2013-02-05T17:59:06-06:00 71.3.202.110 Cape Coral Florida United States North America
2013-02-05T17:59:23-06:00 67.239.18.161 Naples Florida United States North America
你可以看到，在短短几分钟内，就存在差异。在几个小时的过程中，差异可能是数百个。
在这个特定的平面文本日志中没有损坏，所以我看不出它是怎么回事。这将指出SQL日志的问题。我查看了我的PHP错误日志中的可能问题，并没有看到任何明显的东西（我只是搜索了有问题的页面并查看了这些错误）。
有没有想法为什么SQL不会捕获平面文本日志的记录？在我的代码中，SQL日志记录直接在平面文本日志记录之后（可能在平面文本之前放置SQL会产生反向结果？）。
答案 0 :(得分：1)
据我所知，您可以使用文件锁定或syslog。由于您似乎希望让您的应用程序编写不间断的文本块，我认为锁定是可取的。
$lockwait = 2; // seconds to wait for lock
$waittime = 250000; // microseconds to wait between lock attempts
// 2s / 250000us = 8 attempts.
$myfile = '/path/to/file.log';
if( $fh = fopen($myfile, 'a') ) {
$waitsum = 0;
// attempt to get exclusive, non-blocking lock
$locked = flock($fh, LOCK_EX | LOCK_NB);
while( !$locked && ($waitsum <= $lockwait) ) {
$waitsum += $waittime/1000000; // microseconds to seconds
usleep($waittime);
$locked = flock($fh, LOCK_EX | LOCK_NB);
}
if( !$locked ) {
echo "Could not lock $myfile for write within $lockwait seconds.";
} else {
// write out your data here
flock($fh, LOCK_UN); // ALWAYS unlock
}
fclose($fh); // ALWAYS close your file handle
} else {
echo "Could not open $myfile";
exit 1;
}
你也可以使用这种稍微复杂的算法来做一个类似于TCP和CSMA / CD用来避免拥塞的随机'退避'等待。
$max_wait = 1000000; // 1 s
$min_interval = 10000; // 10 ms
$max_interval = 50000; // 50 ms
$cur_wait = $min_interval;
$tot_wait = 0;
$locked = flock($fh, LOCK_EX | LOCK_NB);
while( !$locked && ($tot_wait <= $max_wait) ) {
tot_wait += $cur_wait;
usleep($cur_wait);
cur_wait += rand($min_interval, $max_interval);
$locked = flock($fh, LOCK_EX | LOCK_NB);
}
if( !$locked ) {
echo "Could not lock $myfile for write within $lockwait seconds.";
} else {
// write out your data here
flock($fh, LOCK_UN);
}
fclose($fh);
如果无法获得锁定，则脚本会逐渐等待锁定尝试之间的更长和更长的时间，直到超出$max_wait中定义的时间。
写完所有这些之后我想你可能只想考虑将所有这些插入到数据库中，如果你需要一个日志文件，那么每天运行一次cron作业就可以一次性写出文件，并可选择清空表格。