记录过程的STDIN和STDOUT

Question

我想使用subprocess.Popen()运行一个进程，并通过python shell与之通信，就像subprocess.Popen通常行为一样。 除此之外，我想将STDIN和STDOUT谨慎地记录到日志文件中。

我该怎么做？

Answer 1

假设话语意味着漫游，而漫游则意味着都在同一个文件中，那么下面的代码段就是您所要求的。

辨别来源和交互作用的话语日志

像这里类似的问题一样覆盖其通信方法

import subprocess

def logcommunicate(self, s):
    self.logfilehandle.write("Input "+s)
    std = self.oldcommunicate(s)

    self.logfilehandle.write("Output "+std[0])
    return std

subprocess.Popen.oldcommunicate = subprocess.Popen.communicate
subprocess.Popen.communicate = logcommunicate
logfh = open("/tmp/communicate.log", "a")

proc = subprocess.Popen(['cat'], stdin=subprocess.PIPE, stdout=subprocess.PIPE)
proc.logfilehandle = logfh

result = proc.communicate("hello there\n")
print result 

带有源判别的话语记录

首先使用StringIO代替文件，然后使用StringIO子类重写其write方法以打开添加时间戳和源的方法。 然后编写一个自定义的比较函数，该函数根据时间戳和源进行排序，首先是时间戳，然后是源输入，然后是输出

 with open("file.log","wb") as in logfile:
 out = MyOutPutStringIO.StringIO() 
 in = MyInputStringIO.StringIO()
 subprocess.Popen(cmd, shell=True, universal_newlines = True, stdin=in, stdout=out)

 #Then after you are done
 linestotal = []
 for line in in.readlines():
     linestotal.append(line)
 for line in out.readlines():
     linestotal.append(line)

 linestotal.sort(customsortbasedontimestampandinput)

 for line in linestotal.readlines():
    logwrite.write(line)

话语日志

 with open("file.log","wb") as in logfile:
 subprocess.Popen(cmd, shell=True, universal_newlines = True, stdin=logfile, stdout=logfile)

相反如下所示

草书

 with open("stdout.txt","wb") as out:
 with open("stderr.txt","wb") as err:
 with open("stdin.txt","wb") as in:
 subprocess.Popen(cmd, shell=True, universal_newlines = True, stdin=in,stdout=out,stderr=err)