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annotate server/ts.py @ 329:740438e21ea0

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Fix bugs in server code (try actually running it)
author Matt Johnston <matt@ucc.asn.au>
date Mon, 04 Jun 2012 23:50:42 +0800
parents 46070aaf29ea
children 44c5ab5ea879
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
327
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1 #!/usr/bin/env python2.7
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2
328
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3 BTADDR = "00:12:03:27:70:88"
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4 SLEEP_TIME = 180
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5 # time that the bluetooth takes to get going?
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6 EXTRA_WAKEUP = 0
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7
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8 # avoid turning off the bluetooth etc.
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9 TESTING = True
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10
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11 import sys
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12 import httplib
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13 import time
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14 import traceback
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15
329
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16 from utils import monotonic_time, retry, readline
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17
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18 lightblue = None
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19 try:
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20 import lightblue
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21 except ImportError:
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22 import bluetooth
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23
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24 def get_socket(addr):
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25 if lightblue:
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26 s = lightblue.socket()
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27 s.connect((addr, 1))
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28 else:
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29 s = bluetooth.BluetoothSocket( bluetooth.RFCOMM )
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30 s.connect((addr, 1))
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31
328
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32 s.setnonblocking(True)
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33
327
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34 return s
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35
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36 # from http://blog.stalkr.net/2011/04/pctf-2011-32-thats-no-bluetooth.html
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37 def crc16(buff, crc = 0, poly = 0x8408):
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38 l = len(buff)
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39 i = 0
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40 while i < l:
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41 ch = ord(buff[i])
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42 uc = 0
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43 while uc < 8:
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44 if (crc & 1) ^ (ch & 1):
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45 crc = (crc >> 1) ^ poly
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46 else:
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47 crc >>= 1
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48 ch >>= 1
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49 uc += 1
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50 i += 1
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51 return crc
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52
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53
328
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54 @retry()
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55 def fetch(sock):
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56 sock.send("fetch\n")
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57
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58 crc = 0
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59
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60 lines = []
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61 l = readline(sock)
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62 if l != 'START\n':
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63 print>>sys.stderr, "Bad expected START line '%s'\n" % l.rstrip('\n')
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64 return None
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65 crc = crc16(l, crc)
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66 lines.append(l)
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67
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68 while true:
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69 l = readline(sock)
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70
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71 crc = crc16(l, crc)
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72
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73 if l == 'END\n':
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74 break
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75
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76 lines.append(l)
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77
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78 l = readline(sock)
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79 recv_crc = None
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80 try:
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81 k, v = l.rstrip('\n').split('=')
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82 if k == 'CRC':
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83 recv_crc = int(v)
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84 if recv_crc < 0 or recv_crc > 0xffff:
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85 recv_crc = None
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86 except ValueError:
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87 pass
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88
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89 if recv_crc is None:
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90 print>>sys.stderr, "Bad expected CRC line '%s'\n" % l.rstrip('\n')
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91 return None
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92
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93 if recv_crc != crc:
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94 print>>sys.stderr, "Bad CRC: calculated 0x%x vs received 0x%x\n" % (crc, recv_crc)
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95 return None
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96
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97 return ''.join(lines)
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98
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99 @retry()
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100 def turn_off(sock):
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101 if TESTING:
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102 return None
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103 sock.send("btoff\n");
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104 # read newline
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105 l = readline(sock)
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106 if not l:
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107 print>>sys.stderr, "Bad response to btoff\n"
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108 return None
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109
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110 off, next_wake = l.rstrip().split(':')
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111 if off != 'Off':
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112 print>>sys.stderr, "Bad response to btoff '%s'\n" % l
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113
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114 return int(next_wake)
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115
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116 def do_comms(sock):
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117 d = None
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118 # serial could be unreliable, try a few times
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119 for i in range(FETCH_TRIES):
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120 d = fetch(sock)
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121 if d:
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122 break
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123 time.sleep(1)
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124 if not d:
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125 return
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126
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127 res = send_results()
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128 if not res:
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129 return
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130
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131 clear_meas(sock)
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132
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133 next_wake = turn_off(sock)
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134 sock.close()
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135 return next_wake
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136
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137 testcount = 0
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138
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139 def sleep_for(secs):
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140 until = monotonic_time() + secs
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141 while True:
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142 length = until < monotonic_time()
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143 if length <= 0:
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144 return
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145 time.sleep(length)
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146
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147 def main():
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148
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149 while True:
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150 sock = None
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151 try:
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152 sock = get_socket(BTADDR)
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153 except Exception, e:
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154 print>>sys.stderr, "Error connecting:"
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155 traceback.print_exc(file=sys.stderr)
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156 sleep_time = SLEEP_TIME
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157 if sock:
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158 next_wake = None
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159 try:
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160 next_wake = do_comms(sock)
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161 except Exception, e:
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162 print>>sys.stderr, "Error in do_comms:"
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163 traceback.print_exc(file=sys.stderr)
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164 if next_wake:
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165 sleep_time = min(next_wake+EXTRA_WAKEUP, sleep_time)
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166
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167 if TESTING:
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168 print "Sleeping for %d" % sleep_time
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169 sleep_for(sleep_time)
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170
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171 if __name__ == '__main__':
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172 main()