annotate py/utils.py @ 261:c3600a9fa747

merge long polling
author Matt Johnston <matt@ucc.asn.au>
date Tue, 09 Jun 2015 23:39:22 +0800
parents 26eee8591f61
children 78c542f03030
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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 import binascii
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8 import json
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9
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10 D = logging.debug
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11 L = logging.info
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12 W = logging.warning
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13 E = logging.error
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14
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15 DEFAULT_TRIES = 3
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16 READLINE_SELECT_TIMEOUT = 1
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17
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18 def EX(msg, *args, **kwargs):
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19 kwargs['exc_info'] = True
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20 logging.error(msg, *args, **kwargs)
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21
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22 clock_gettime = None
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23 no_clock_gettime = True
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24 def monotonic_time():
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25 global clock_gettime
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26 global no_clock_gettime
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27 if no_clock_gettime:
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28 return time.time()
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29
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30 class timespec(ctypes.Structure):
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31 _fields_ = [
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32 ('tv_sec', ctypes.c_long),
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33 ('tv_nsec', ctypes.c_long)
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34 ]
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35 if not clock_gettime:
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36 try:
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37 librt = ctypes.CDLL('librt.so.0', use_errno=True)
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38 clock_gettime = librt.clock_gettime
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39 clock_gettime.argtypes = [ctypes.c_int, ctypes.POINTER(timespec)]
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40 except:
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41 W("No clock_gettime(), using fake fallback.")
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42 no_clock_gettime = True
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43 return time.time()
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44
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45 t = timespec()
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46 CLOCK_MONOTONIC = 1 # see <linux/time.h>
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47
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48 if clock_gettime(CLOCK_MONOTONIC, ctypes.pointer(t)) != 0:
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49 errno_ = ctypes.get_errno()
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50 raise OSError(errno_, os.strerror(errno_))
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51 return t.tv_sec + t.tv_nsec * 1e-9
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52
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53 # decorator, tries a number of times, returns None on failure, sleeps between
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54 # Must be used as "@retry()" if arguments are defaulted
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55 def retry(retries=DEFAULT_TRIES, try_time = 1):
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56 def inner(func):
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57 def new_f(*args, **kwargs):
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58 for i in range(retries):
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59 d = func(*args, **kwargs)
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60 if d is not None:
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61 return d
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62 time.sleep(try_time)
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63 return None
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64
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65 new_f.__name__ = func.__name__
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66 return new_f
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67 return inner
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68
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69 def readline(sock):
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70 timeout = READLINE_SELECT_TIMEOUT
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71 buf = ''
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72 while True:
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73 (rlist, wlist, xlist) = select.select([sock], [], [], timeout)
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74 if sock not in rlist:
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75 # hit timeout
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76 return None
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77
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78 c = sock.recv(1)
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79 if c == '':
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80 # lightblue timeout
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81 return None
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82 if c == '\r':
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83 continue
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84
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85 buf += c
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86 if c == '\n':
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87 return buf
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88
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89 # from http://blog.stalkr.net/2011/04/pctf-2011-32-thats-no-bluetooth.html
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90 def crc16(buff, crc = 0, poly = 0x8408):
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91 l = len(buff)
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92 i = 0
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93 while i < l:
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94 ch = ord(buff[i])
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95 uc = 0
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96 while uc < 8:
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97 if (crc & 1) ^ (ch & 1):
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98 crc = (crc >> 1) ^ poly
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99 else:
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100 crc >>= 1
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101 ch >>= 1
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102 uc += 1
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103 i += 1
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104 return crc
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105
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106 def cheap_daemon():
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107 L("Daemonising.")
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108 sys.stdout.flush()
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109 sys.stderr.flush()
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110 out = file('/dev/null', 'a+')
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111 os.dup2(out.fileno(), sys.stdout.fileno())
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112 os.dup2(out.fileno(), sys.stderr.fileno())
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113
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114 try:
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115 pid = os.fork()
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116 if pid > 0:
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117 sys.exit(0)
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118 except OSError as e:
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119 E("Bad fork()")
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120 sys.exit(1)
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121
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122 os.setsid()
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123
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124 try:
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125 pid = os.fork()
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126 if pid > 0:
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127 sys.exit(0)
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128 except OSError as e:
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129 E("Bad fork()")
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130 sys.exit(1)
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131
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132 def uptime():
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133 try:
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134 return float(open('/proc/uptime', 'r').read().split(' ', 1)[0])
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135 except Exception as e:
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136 return -1
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137
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138
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139 def json_load_round_float(s, **args):
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140 return json.loads(s,parse_float = lambda f: round(float(f), 2), **args)