如何读取不断更新的文件? [英] How do I read a file which is constantly updating?

问题描述

我从外部服务器获取数据流(文本格式)，并希望将其逐行传递到脚本.该文件将以连续方式添加.这是执行此操作的理想方法.使用Perl的IO :: Socket方法可以吗?最终，这些数据必须通过PHP程序(可重复使用)，并最终进入MySQL数据库.

I am getting a stream of data (text format) from an external server and like to pass it on to a script line-by-line. The file is getting appended in a continuous manner. Which is the ideal method to perform this operation. Is IO::Socket method using Perl will do? Eventually this data has to pass through a PHP program (reusable) and eventually land onto a MySQL database.

问题是如何打开不断更新的文件?

The question is how to open the file, which is continuously getting updated?

推荐答案

在Perl中，您可以使用 tell 从不断增长的内容中读取文件.可能看起来像这样(从 perldoc -f seek 大量借用)

In Perl, you can make use of seek and tell to read from a continuously growing file. It might look something like this (borrowed liberally from perldoc -f seek)

open(FH,'<',$the_file) || handle_error();  # typical open call
for (;;) {
    while (<FH>) {
        # ... process $_ and do something with it ...
    }
    # eof reached on FH, but wait a second and maybe there will be more output
    sleep 1;
    seek FH, 0, 1;      # this clears the eof flag on FH
}

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