[英]Read a log file while a subprocess is running
I have a process that outputs logs to a file, and I'm trying to make a python script to run that process and output only the log that it generates into that log file.我有一个将日志输出到文件的进程,我正在尝试制作一个 python 脚本来运行该进程并仅将它生成的日志输出到该日志文件中。
What I wrote below seems to do what I want except for one big issue: it never exists the while loop.我在下面写的内容似乎做了我想做的事情,除了一个大问题:它从不存在 while 循环。 I've tried a few other alternatives with no luck.我尝试了一些其他的选择,但没有运气。
Any help here would be really appreciated!这里的任何帮助将不胜感激! I guess it's worth noting I could also use node script instead...我想值得注意的是,我也可以使用节点脚本代替...
import subprocess
import sh
process = subprocess.Popen(cmd)
log_tail = sh.tail("-f", log_file, _iter=True)
while process.returncode is None:
sys.stdout.write(log_tail.next())
sys.stdout.flush()
process.poll()
The tail -f
command is intended to run until explicitly interrupted, which is why the loop is never exited. tail -f
命令旨在运行直到被明确中断,这就是循环永远不会退出的原因。 You could try this:你可以试试这个:
import subprocess
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout, stderr = p.communicate()
which will wait until the cmd
terminates and return the contents of its output streams in stdout
and stderr
.它将等到cmd
终止并在stdout
和stderr
返回其输出流的内容。
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