annotate server/ts.py @ 395:f0ddb75bcf04

main.c : add a delay before turning on uart server : try and improve timeouts, get rid of lightblue, don't use https, use python logging module
author Matt Johnston <matt@ucc.asn.au>
date Sun, 15 Jul 2012 21:49:59 +0800
parents b33045e7e08e
children 231662c6690c
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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 import logging
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23
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24 L = logging.info
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25 W = logging.warning
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26 E = logging.error
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27
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28 import config
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29
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30 from utils import monotonic_time, retry, readline, crc16
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31 import utils
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32
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33 import bluetooth
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34
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35 def get_socket(addr):
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36 s = bluetooth.BluetoothSocket( bluetooth.RFCOMM )
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37 s.settimeout(1)
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38 s.connect((addr, 1))
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39
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40 return s
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41
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42
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43 @retry()
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44 def fetch(sock):
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45 sock.send("fetch\n")
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46
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47 crc = 0
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48
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49 lines = []
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50 l = readline(sock)
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51 if l != 'START\n':
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52 W("Bad expected START line '%s'\n" % l.rstrip('\n'))
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53 return None
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54 crc = crc16(l, crc)
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55
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56 while True:
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57 l = readline(sock)
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58
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59 crc = crc16(l, crc)
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60
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61 if l == 'END\n':
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62 break
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63
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64 lines.append(l.rstrip('\n'))
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65
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66 for d in lines:
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67 L("Received: %s" % d)
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68
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69 l = readline(sock)
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70 recv_crc = None
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71 try:
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72 k, v = l.rstrip('\n').split('=')
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73 if k == 'CRC':
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74 recv_crc = int(v)
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75 if recv_crc < 0 or recv_crc > 0xffff:
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76 recv_crc = None
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77 except ValueError:
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78 pass
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79
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80 if recv_crc is None:
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81 W("Bad expected CRC line '%s'\n" % l.rstrip('\n'))
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82 return None
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83
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84 if recv_crc != crc:
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85 W("Bad CRC: calculated 0x%x vs received 0x%x\n" % (crc, recv_crc))
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86 return None
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87
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88 return lines
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89
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90 @retry()
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91 def turn_off(sock):
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92 if TESTING:
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93 return 99
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94 L("Sending btoff")
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95 sock.send("btoff\n");
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96 # read newline
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97 l = readline(sock)
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98 if not l:
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99 W("Bad response to btoff")
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100 return None
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101
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102 if not l.startswith('off:'):
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103 W("Bad response to btoff '%s'" % l)
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104 return None
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105 off, next_wake = l.rstrip().split(':')
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106 L("Next wake %s" % next_wake)
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107
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108 return int(next_wake)
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109
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110 @retry()
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111 def clear_meas(sock):
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112 sock.send("clear\n");
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113 l = readline(sock)
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114 if l and l.rstrip() == 'cleared':
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115 return True
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116
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117 E("Bad response to clear '%s'" % str(l))
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118 return False
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119
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120 def send_results(lines):
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121 enc_lines = binascii.b2a_base64(zlib.compress('\n'.join(lines)))
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122 mac = hmac.new(config.HMAC_KEY, enc_lines).hexdigest()
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123
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124 url_data = urllib.urlencode( {'lines': enc_lines, 'hmac': mac} )
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125 con = urllib2.urlopen(config.UPDATE_URL, url_data)
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126 result = con.read(100)
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127 if result == 'OK':
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128 return True
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129 else:
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130 W("Bad result '%s'" % result)
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131 return False
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132
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133 def do_comms(sock):
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134 L("do_comms")
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135 d = None
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136 # serial could be unreliable, try a few times
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137 d = fetch(sock)
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138 if not d:
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139 return
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140
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141 res = send_results(d)
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142 if not res:
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143 return
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144
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145 clear_meas(sock)
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146
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147 next_wake = turn_off(sock)
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148 sock.close()
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149 return next_wake
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150
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151 testcount = 0
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152
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153 def sleep_for(secs):
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154 until = monotonic_time() + secs
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155 while True:
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156 length = until - monotonic_time()
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157 if length <= 0:
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158 return
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159 time.sleep(length)
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160
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161 def setup_logging():
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162 logging.basicConfig(format='%(asctime)s %(message)s',
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163 datefmt='%m/%d/%Y %I:%M:%S %p')
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164
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165 def main():
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166 setup_logging()
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167
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168 L("Running templog rfcomm server")
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169
371
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170 if '--daemon' in sys.argv:
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171 utils.cheap_daemon()
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172
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173 while True:
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174 sock = None
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175 try:
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176 sock = get_socket(config.BTADDR)
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177 except Exception, e:
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178 pass
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179 #print>>sys.stderr, "Error connecting:"
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180 #traceback.print_exc(file=sys.stderr)
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181 next_wake_time = 0
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182 if sock:
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183 try:
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184 avr_wake = do_comms(sock)
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185 next_wake_time = time.time() + avr_wake
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186 except Exception, e:
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187 logging.exception("Error in do_comms")
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188
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189 next_wake_interval = next_wake_time - time.time() - EXTRA_WAKEUP
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190 sleep_time = config.SLEEP_TIME
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191 if next_wake_interval > 0:
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192 sleep_time = min(next_wake_interval, sleep_time)
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193 L("Sleeping for %d, next wake time %f" % (sleep_time, next_wake_time))
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194 sleep_for(sleep_time)
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195
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196 if __name__ == '__main__':
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197 main()