src/misc.py

   1 import logging
   2 import os
   3 import shlex
   4 import subprocess
   5 import time
   6
   7 def follow_file(path):
   8     while True:
   9         try:
  10             fd = os.open(path, os.O_RDONLY)
  11             current_ino = os.fstat(fd).st_ino
  12             with os.fdopen(fd, "r") as f:
  13                 logging.info("Re-attached to file.")
  14                 for line in f: pass
  15                 while True:
  16                     line = f.readline()
  17                     if not line:
  18                         if os.stat(path).st_ino != current_ino or \
  19                            os.stat(path).st_size < f.tell():
  20                             break
  21                         else:
  22                             time.sleep(1.0)
  23                             yield None
  24                     else:
  25                         yield line.rstrip("\n")
  26         except FileNotFoundError:
  27             time.sleep(1.0)
  28             yield None
  29
  30 def feed_handler(cmd, data):
  31     try:
  32         handler = subprocess.Popen(shlex.split(cmd),
  33                                    stdin=subprocess.PIPE,
  34                                    stdout=subprocess.PIPE,
  35                                    stderr=subprocess.PIPE,
  36                                    encoding='UTF-8')
  37         out_data, err_data = handler.communicate("%s\n" % data)
  38         if handler.returncode != 0:
  39             logging.warning("Handler exited with non-zero return code %d! (%s)" %
  40                             (handler.returncode, err_data))
  41     except Exception as e:
  42         logging.error("Error feeding handler: %s" % str(e))
  43
  44 def create_msg(title, icon, logfile, text, lines):
  45     msg = "<b>%s</b> <i>%s</i> %s" % (title, logfile, icon)
  46     msg += "<br>%s" % text
  47     msg += "<br><pre>"
  48     for line in lines: msg += line + "\n"
  49     msg += "</pre>"
  50     return msg
  51
  52 def print_list(lst, ptr):
  53     txt = '['
  54     for i in range(0, len(lst)):
  55         txt += str( lst[(ptr + i) % len(lst)] )
  56         if i < len(lst) - 1: txt += ', '
  57     txt += ']'
  58     return txt