annotate server/ts.py @ 88:6f4497a448e8

increase temperature logging range
author Matt Johnston <matt@ucc.asn.au>
date Thu, 12 Jul 2012 23:47:29 +0800
parents 0f7c005b3f87
children 51d889ad39a3
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1 #!/usr/bin/env python2.7
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2
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3 # time that the bluetooth takes to get going?
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4 EXTRA_WAKEUP = 0
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5
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6 FETCH_TRIES = 3
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7
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8 # avoid turning off the bluetooth etc.
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9 TESTING = False
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10
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11 import sys
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12 # for wrt
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13 sys.path.append('/root/python')
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14 import httplib
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15 import time
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16 import traceback
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17 import binascii
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18 import hmac
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19 import zlib
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20 import urllib
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21 import urllib2
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22
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23 import config
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24
26
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25 from utils import monotonic_time, retry, readline, crc16
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26 import utils
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27
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28 lightblue = None
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29 try:
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30 import lightblue
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31 except ImportError:
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32 import bluetooth
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33
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34 def get_socket(addr):
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35 if lightblue:
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36 s = lightblue.socket()
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37 s.connect((addr, 1))
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38 s.settimeout(3)
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39 else:
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40 s = bluetooth.BluetoothSocket( bluetooth.RFCOMM )
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41 s.connect((addr, 1))
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42
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43 s.setblocking(False)
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44
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45 return s
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48 @retry()
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49 def fetch(sock):
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50 print "fetch"
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51 sock.send("fetch\n")
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52
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53 crc = 0
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54
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55 lines = []
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56 l = readline(sock)
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57 if l != 'START\n':
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58 print>>sys.stderr, "Bad expected START line '%s'\n" % l.rstrip('\n')
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59 return None
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60 crc = crc16(l, crc)
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62 while True:
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63 l = readline(sock)
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64
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65 crc = crc16(l, crc)
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66
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67 if l == 'END\n':
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68 break
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69
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70 lines.append(l.rstrip('\n'))
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71
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72 print lines
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73
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74 l = readline(sock)
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75 recv_crc = None
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76 try:
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77 k, v = l.rstrip('\n').split('=')
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78 print k,v
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79 if k == 'CRC':
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80 recv_crc = int(v)
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81 if recv_crc < 0 or recv_crc > 0xffff:
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82 recv_crc = None
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83 except ValueError:
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84 pass
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85
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86 if recv_crc is None:
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87 print>>sys.stderr, "Bad expected CRC line '%s'\n" % l.rstrip('\n')
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88 return None
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89
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90 if recv_crc != crc:
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91 print>>sys.stderr, "Bad CRC: calculated 0x%x vs received 0x%x\n" % (crc, recv_crc)
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92 return None
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93
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94 return lines
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95
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96 @retry()
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97 def turn_off(sock):
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98 if TESTING:
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99 return 99
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100 print>>sys.stderr, "sending btoff"
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101 sock.send("btoff\n");
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102 # read newline
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103 l = readline(sock)
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104 if not l:
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105 print>>sys.stderr, "Bad response to btoff\n"
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106 return None
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107
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108 if not l.startswith('off:'):
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109 print>>sys.stderr, "Bad response to btoff '%s'\n" % l
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110 return None
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111 off, next_wake = l.rstrip().split(':')
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112 print>>sys.stderr, "Next wake %s" % next_wake
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113
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114 return int(next_wake)
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115
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116 @retry()
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117 def clear_meas(sock):
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118 sock.send("clear\n");
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119 l = readline(sock)
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120 if l and l.rstrip() == 'cleared':
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121 return True
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122
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123 print>>sys.stderr, "Bad response to clear %s\n" % str(l)
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124 return False
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125
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126 def send_results(lines):
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127 enc_lines = binascii.b2a_base64(zlib.compress('\n'.join(lines)))
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128 mac = hmac.new(config.HMAC_KEY, enc_lines).hexdigest()
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129
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130 url_data = urllib.urlencode( {'lines': enc_lines, 'hmac': mac} )
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131 con = urllib2.urlopen(config.UPDATE_URL, url_data)
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132 result = con.read(100)
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133 if result == 'OK':
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134 return True
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135 else:
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136 print>>sys.stderr, "Bad result '%s'" % result
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137 return False
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138
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139 def do_comms(sock):
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140 print "do_comms"
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141 d = None
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142 # serial could be unreliable, try a few times
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143 for i in range(FETCH_TRIES):
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144 d = fetch(sock)
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145 if d:
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146 break
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147 time.sleep(1)
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148 if not d:
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149 return
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150
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151 res = send_results(d)
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152 if not res:
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153 return
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154
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155 clear_meas(sock)
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156
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157 next_wake = turn_off(sock)
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158 sock.close()
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159 return next_wake
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160
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161 testcount = 0
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162
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163 def sleep_for(secs):
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164 until = monotonic_time() + secs
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165 while True:
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166 length = until - monotonic_time()
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167 if length <= 0:
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168 return
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169 time.sleep(length)
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170
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171 def main():
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172 next_wake_time = 0
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173
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174 if '--daemon' in sys.argv:
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175 utils.cheap_daemon()
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176
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177 while True:
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178 sock = None
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179 try:
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180 sock = get_socket(config.BTADDR)
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181 except Exception, e:
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182 print>>sys.stderr, "Error connecting:"
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183 traceback.print_exc(file=sys.stderr)
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184 sleep_time = config.SLEEP_TIME
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185 if sock:
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186 next_wake = None
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187 try:
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188 next_wake_interval = do_comms(sock)
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189 next_wake_time = time.time() + next_wake_interval
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190 except Exception, e:
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191 print>>sys.stderr, "Error in do_comms:"
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192 traceback.print_exc(file=sys.stderr)
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193 if next_wake_time > time.time():
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194 sleep_time = min(next_wake_time - time.time() - EXTRA_WAKEUP, sleep_time)
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195
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196 print "Sleeping for %d" % sleep_time
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197 sleep_for(sleep_time)
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198
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199 if __name__ == '__main__':
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200 main()