annotate py/utils.py @ 529:5201f441bf4a

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author Matt Johnston <matt@ucc.asn.au>
date Fri, 10 Apr 2015 23:59:16 +0800
parents fe729664a5e6
children 0a1b642e3086
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1 import os
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2 import sys
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3 #import ctypes
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4 import time
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5 import select
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6 import logging
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7
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8 D = logging.debug
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9 L = logging.info
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10 W = logging.warning
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11 E = logging.error
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12
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13 DEFAULT_TRIES = 3
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14 READLINE_SELECT_TIMEOUT = 1
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15
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16 def EX(msg, *args, **kwargs):
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17 kwargs['exc_info'] = True
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18 logging.error(msg, *args, **kwargs)
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19
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20 clock_gettime = None
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21 no_clock_gettime = True
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22 def monotonic_time():
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23 global clock_gettime
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24 global no_clock_gettime
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25 if no_clock_gettime:
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26 return time.time()
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27
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28 class timespec(ctypes.Structure):
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29 _fields_ = [
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30 ('tv_sec', ctypes.c_long),
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31 ('tv_nsec', ctypes.c_long)
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32 ]
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33 if not clock_gettime:
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34 try:
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35 librt = ctypes.CDLL('librt.so.0', use_errno=True)
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36 clock_gettime = librt.clock_gettime
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37 clock_gettime.argtypes = [ctypes.c_int, ctypes.POINTER(timespec)]
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38 except:
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39 W("No clock_gettime(), using fake fallback.")
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40 no_clock_gettime = True
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41 return time.time()
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42
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43 t = timespec()
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44 CLOCK_MONOTONIC = 1 # see <linux/time.h>
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45
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46 if clock_gettime(CLOCK_MONOTONIC, ctypes.pointer(t)) != 0:
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47 errno_ = ctypes.get_errno()
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48 raise OSError(errno_, os.strerror(errno_))
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49 return t.tv_sec + t.tv_nsec * 1e-9
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50
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51 # decorator, tries a number of times, returns None on failure, sleeps between
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52 # Must be used as "@retry()" if arguments are defaulted
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53 def retry(retries=DEFAULT_TRIES, try_time = 1):
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54 def inner(func):
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55 def new_f(*args, **kwargs):
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56 for i in range(retries):
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57 d = func(*args, **kwargs)
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58 if d is not None:
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59 return d
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60 time.sleep(try_time)
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61 return None
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62
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63 new_f.__name__ = func.__name__
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64 return new_f
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65 return inner
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66
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67 def readline(sock):
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68 timeout = READLINE_SELECT_TIMEOUT
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69 buf = ''
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70 while True:
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71 (rlist, wlist, xlist) = select.select([sock], [], [], timeout)
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72 if sock not in rlist:
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73 # hit timeout
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74 return None
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75
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76 c = sock.recv(1)
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77 if c == '':
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78 # lightblue timeout
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79 return None
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80 if c == '\r':
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81 continue
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82
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83 buf += c
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84 if c == '\n':
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85 return buf
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86
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87 # from http://blog.stalkr.net/2011/04/pctf-2011-32-thats-no-bluetooth.html
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88 def crc16(buff, crc = 0, poly = 0x8408):
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89 l = len(buff)
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90 i = 0
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91 while i < l:
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92 ch = ord(buff[i])
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93 uc = 0
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94 while uc < 8:
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95 if (crc & 1) ^ (ch & 1):
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96 crc = (crc >> 1) ^ poly
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97 else:
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98 crc >>= 1
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99 ch >>= 1
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100 uc += 1
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101 i += 1
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102 return crc
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103
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104 def cheap_daemon():
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105 L("Daemonising.")
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106 sys.stdout.flush()
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107 sys.stderr.flush()
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108 out = file('/dev/null', 'a+')
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109 os.dup2(out.fileno(), sys.stdout.fileno())
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110 os.dup2(out.fileno(), sys.stderr.fileno())
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111
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112 try:
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113 pid = os.fork()
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114 if pid > 0:
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115 sys.exit(0)
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116 except OSError as e:
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117 E("Bad fork()")
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118 sys.exit(1)
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119
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120 os.setsid()
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121
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122 try:
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123 pid = os.fork()
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124 if pid > 0:
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125 sys.exit(0)
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126 except OSError as e:
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127 E("Bad fork()")
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128 sys.exit(1)
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129
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130 def uptime():
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131 try:
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132 return float(open('/proc/uptime', 'r').read().split(' ', 1)[0])
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133 except Exception as e:
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134 return -1
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135